NLE Emergency & Critical Care Nursing — Common Medical EmergenciesStudy Notes

Respiratory failure is the inability to maintain adequate oxygenation or ventilation, representing a final common pathway for multiple disease states including asthma, COPD exacerbation, pneumonia, pulmonary edema, and pulmonary embolism. Understanding the progression from subtle early signs to critical decompensation is fundamental to emergency nursing practice. Universal Clinical Signs of Respiratory Compromise: Early signs include an increasing respiratory rate (tachypnea), visible use of accessory muscles (intercostal, supraclavicular retractions, abdominal breathing), restlessness, and anxiety (the patient may not recognize these as hypoxia-related). These reflect the body's attempt to increase oxygen intake. As hypoxia worsens, the patient becomes progressively more confused and drowsy. Late signs include cyanosis (circumoral or peripheral), oxygen saturation falling below 90%, and a declining level of consciousness progressing toward unresponsiveness. Critical Assessment Pearl—"Silent Chest" in Asthma: A previously wheezing asthmatic patient who suddenly becomes quiet is experiencing a medical emergency. This is NOT improvement. The absence of wheeze indicates airflow has become so severely obstructed that air movement is insufficient to generate sound. This "silent chest" signals impending respiratory arrest and demands immediate escalation of care. This concept appears frequently on the NLE and is easily missed by nurses unfamiliar with the pattern. Priority Nursing Interventions (In Order of Execution): 1. Position upright (high Fowler's or semi-Fowler's, 45 degrees or higher) to maximize lung expansion by lowering abdominal contents away from the diaphragm and allowing full excursion. 2. Deliver supplemental oxygen immediately—aim for oxygen saturation ≥94% (or >90% in COPD patients with CO₂ retention risk, where aggressive oxygenation can suppress respiratory drive). 3. Establish IV access and continuous cardiac/pulse oximetry monitoring. 4. Administer condition-specific medications based on diagnosis: - For acute asthma exacerbation: Inhaled short-acting beta-2 agonists (salbutamol/albuterol), typically given via nebulizer or metered-dose inhaler (MDI). For severe attacks, add inhaled anticholinergics (ipratropium bromide). Systemic corticosteroids (oral prednisolone or IV hydrocortisone) reduce airway inflammation and prevent relapse. - For COPD exacerbation: Similar approach with beta-2 agonists and anticholinergics; consider controlled oxygen therapy if CO₂ retention is present. - For pulmonary edema: See Acute Heart Failure section below. 5. Prepare for escalation: If the patient does not improve with initial interventions, be ready for noninvasive positive-pressure ventilation (NIPPV/BiPAP/CPAP) or intubation. Continuous Reassessment Protocol: After every intervention, reassess and document: respiratory rate and effort, oxygen saturation, accessory muscle use, level of consciousness, and lung sounds. Document trends, not isolated values. If the patient is not improving within 15–30 minutes or is deteriorating, escalate immediately (alert the physician, prepare for airway management, anticipate ICU transfer). Nursing Diagnosis and Care Planning: Applicable NANDA-I diagnoses include: - Ineffective breathing pattern (related to airway obstruction, decreased energy, neuromuscular impairment) - Impaired gas exchange (related to altered oxygen supply secondary to bronchoconstriction or ventilation-perfusion mismatch) - Anxiety (related to difficulty breathing, hypoxia, or fear of death) Using Maslow's hierarchy, physiologic needs (oxygen, breathing) are paramount; anxiety management follows once breathing improves.

Acute coronary syndrome (ACS)—myocardial ischemia or infarction—is a can't-miss diagnosis. The fundamental principle is that myocardial cells die within hours if blood flow is not restored. Every minute counts: "time is muscle." The goal is to restore coronary perfusion and reduce myocardial oxygen demand as rapidly as possible. Classic Presentation: Classic symptoms include crushing, substernal chest pain (often described as pressure, squeezing, or heaviness) that may radiate to the left arm, jaw, or back, accompanied by diaphoresis (heavy sweating), nausea, and shortness of breath. However, atypical presentations are common, especially in women, older adults, and diabetic patients, who may present with fatigue, dyspnea alone, or vague epigastric discomfort. Awareness of these variations prevents dangerous delays in diagnosis. Priority Nursing Actions—The MONA Framework: These interventions are applied simultaneously or in rapid succession (not rigidly in order), guided by assessment findings and the patient's condition: 1. Oxygen: Administer supplemental oxygen only if the patient is hypoxic (SpO₂ <94%). Excessive oxygen in a non-hypoxic patient may increase coronary vascular resistance and worsen ischemia; thus, oxygen is not universally given. 2. Nitroglycerin (NTG): Sublingual nitroglycerin dilates coronary vessels, reduces preload and afterload, and decreases myocardial oxygen demand. Give 0.3–0.6 mg sublingually; repeat every 5 minutes up to 3 doses (or according to protocol). CRITICAL contraindications: - Hypotension (systolic <90 mmHg); withhold NTG to prevent further hemodynamic collapse - Recent use of phosphodiesterase-5 (PDE-5) inhibitors (sildenafil/Viagra, tadalafil/Cialis) within 24–48 hours; combined use causes profound vasodilation and life-threatening hypotension - Suspected right ventricular infarction (inferior MI with RV involvement); RV preload is critical, and NTG causes dangerous hypotension - Right-sided chest leads (V4R) show ST elevation in RV infarction 3. Aspirin: Chewed (not swallowed whole, to accelerate absorption) at 160–325 mg. Aspirin irreversibly inhibits platelet aggregation, preventing clot propagation. Give as soon as ACS is suspected; do not wait for ECG confirmation if the clinical picture is convincing. Contraindication: known aspirin allergy; in that case, use clopidogrel or ticagrelor per protocol. 4. Morphine: IV morphine (2–4 mg IV push, repeated every 5–30 minutes as needed, up to 12 mg) relieves chest pain unresponsive to nitroglycerin. Beyond pain relief, morphine reduces anxiety and preload, decreasing myocardial oxygen demand. Use cautiously in hypotensive patients or respiratory depression. The 12-Lead ECG—Window to the Diagnosis: A 12-lead ECG must be obtained and interpreted **within 10 minutes** of patient arrival. This is a critical NLE point. The ECG reveals: - ST elevation in specific leads → ST-elevation MI (STEMI), indicating full-thickness transmural infarction requiring urgent reperfusion (PCI or fibrinolysis) - ST depression or T-wave changes → non-ST-elevation MI (NSTEMI) or unstable angina, usually managed with antiplatelet and anticoagulant therapy - Normal ECG does not rule out ACS; serial ECGs and troponin levels are needed Reperfusion Strategy for STEMI: - Percutaneous coronary intervention (PCI): Preferred if the patient is in a PCI-capable facility and can receive intervention within 120 minutes of first ECG - Fibrinolytic therapy: If PCI is not available or cannot be done within 120 minutes, fibrinolytic drugs (alteplase, tenecteplase) are given to dissolve the thrombus, ideally within 30 minutes of diagnosis ("door-to-needle time") - Door-to-balloon time (for PCI) or door-to-needle time (for fibrinolysis) is a critical quality metric Secondary Measures: - Continuous cardiac monitoring and pulse oximetry - IV access (at least two lines for potential emergency medications) - Blood work: cardiac biomarkers (troponin, myoglobin), CBC, BMP, coagulation studies, lipid panel - Prepare for potential complications: arrhythmias, cardiogenic shock, acute pump failure Philippine Healthcare Context (RA 9173): The Nursing Act of 2002 (RA 9173) empowers nurses to administer medications (under protocol) and make rapid clinical judgments. In Philippine emergency departments and ambulances, nurses often initiate MONA and ECG while alerting the physician. Knowledge of ACS signs, rapid ECG, and MONA forms the core of emergency nursing competency. Nursing Diagnoses and Reassessment: - Acute pain (related to myocardial ischemia) - Decreased cardiac output (related to impaired contractility secondary to ischemia) - Anxiety (related to threat of death, chest pain) - After reperfusion, Risk for complications (arrhythmia, cardiogenic shock) Continuous reassessment: Check BP, HR, RR, oxygen saturation, and chest pain level every 5 minutes for the first 30 minutes, then every 15 minutes. Monitor for relief of chest pain (goal is pain-free or significant reduction) and for any new symptoms or deterioration.

Acute decompensated heart failure (ADHF) with pulmonary edema is a medical emergency characterized by sudden inability of the heart to maintain adequate forward flow and pressure control. Fluid backs up into the lungs, flooding the alveoli and causing severe dyspnea. The classic picture is unmistakable and appears on nearly every NLE examination. Pathophysiology Overview: In acute decompensation, the failing ventricle cannot eject blood efficiently (systolic failure) or relax fully (diastolic failure), causing: - Elevated pulmonary venous pressure → fluid transudation into alveoli and interstitium - Pulmonary edema (pulmonary congestion) - Hypoxemia from fluid-filled alveoli reducing gas exchange - Sympathetic activation → tachycardia, vasoconstriction, and worsening of the workload Classic Clinical Presentation: - Severe dyspnea, often orthopnea (breathlessness when lying flat, improving when upright) - Anxiety and sense of impending doom ("I'm drowning", "I can't breathe") - Tachycardia and tachypnea - Crackles (rales) on auscultation, often bilateral and in dependent areas - Pink, frothy sputum (pulmonary edema fluid mixing with mucus and blood) - Profuse diaphoresis (cold, clammy skin) - Possible altered mental status from hypoxemia - On chest X-ray: bilateral infiltrates (Kerley B lines, alveolar opacification) Priority Nursing Interventions—"Sit Them Up, Dry Them Out, Open Them Up": This mnemonic captures the three pillars of acute pulmonary edema management: 1. Sit Them Up (Position and Oxygenation): - Position the patient upright (high Fowler's, 45–90 degrees) immediately. This reduces venous return to the right heart, lowers pulmonary venous pressure, and allows gravity to shift fluid away from the lungs. The psychological effect is also crucial—upright positioning is reassuring to the anxious, dyspneic patient. - For a hypotensive patient, use semi-Fowler's (45 degrees) rather than completely flat. - Deliver high-flow oxygen (6–15 L/min via non-rebreather mask, aiming for SpO₂ ≥94%). - If hypoxemia is severe and not responding to oxygen alone, be prepared for noninvasive ventilation (CPAP or BiPAP), which splints the alveoli open, improves gas exchange, and recruits collapsed alveoli. NIPPV is a life-saving intervention in acute pulmonary edema and reduces the need for intubation. 2. Dry Them Out (Diuresis): - Administer an IV loop diuretic (furosemide/Lasix, 20–80 mg IV, or higher in patients already on chronic diuretics; repeat every 2–4 hours as needed based on urine output and respiratory status). Loop diuretics inhibit the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle, causing potent diuresis and reducing circulating volume and pulmonary venous pressure. - Monitor urine output closely; aim for at least 100–200 mL/hour during acute diuresis. - Serial weights (daily): significant weight loss (0.5–1 kg per day) indicates successful fluid offloading. - Monitor electrolytes, especially potassium, which can drop dangerously with diuresis. - Strict fluid intake restriction (typically 1–1.5 L/day in acute phase). - Monitor and record intake and output carefully; this data guides escalation of diuretic dose. 3. Open Them Up (Vasodilation): - Administer IV nitroglycerin (starting at 0.5 mcg/kg/min and titrating upward every 5–10 minutes based on BP and symptom response) or IV nitrates (sodium nitroprusside) to reduce preload (venous capacitance) and afterload (arterial resistance). Reduced afterload lessens the workload on the failing heart. - Nitroglycerin also has a direct coronary vasodilatory effect, helpful if ischemia is contributing to the decompensation. - Use caution: nitroglycerin can cause hypotension; monitor BP continuously (ideally via arterial line in ICU) and titrate to effect. - Other agents: ACE inhibitors (lisinopril, enalapril) may be used IV in some protocols (enalapril 0.625–1.25 mg IV q6h) to reduce afterload and preload. Monitoring and Reassessment: - Continuous pulse oximetry, cardiac monitoring, and frequent BP checks (initially every 5–15 minutes). - Auscultate lung fields frequently; crackles should diminish as pulmonary edema resolves. - Monitor sputum character: pink/frothy initially, becoming clearer as fluid is reabsorbed. - Reassess dyspnea using a standardized scale; goal is rapid improvement toward baseline. - Hemodynamic monitoring (in ICU): CVP, pulmonary artery pressure, cardiac output if available. - Serial labs: electrolytes (especially K+), BNP (B-type natriuretic peptide, elevated in heart failure and used to guide therapy), renal function, troponin (to assess for acute ischemia as trigger). Additional Supportive Measures: - Keep patient NPO initially (risk of aspiration if sputum is frothy; also prepares for possible intubation). - IV access: two large-bore IVs for potential emergency drugs. - Psychological support: reassure the patient that aggressive treatment is working; reduce anxiety, which escalates dyspnea. - Prepare for potential complications: arrhythmias (from electrolyte shifts or ischemia), renal failure (from aggressive diuresis or hypotension), cardiogenic shock (if the heart fails to maintain adequate perfusion despite treatment). Understanding Cardiogenic Shock: If despite aggressive diuresis and vasodilation the patient remains hypotensive (SBP <90), with poor urine output (<0.5 mL/kg/hr) and signs of poor perfusion (altered mental status, cool extremities, elevated lactate), the patient is in cardiogenic shock. Management shifts: reduce diuretics (which worsen preload), consider inotropic support (dobutamine, milrinone) to improve contractility, and possibly a vasopressor (norepinephrine) to support BP. Mechanical support (intra-aortic balloon pump, left ventricular assist device) may be considered in refractory cases. Nursing Diagnoses (NANDA-I): - Impaired gas exchange (related to pulmonary edema) - Ineffective breathing pattern (related to fluid in alveoli, anxiety) - Excess fluid volume (related to impaired cardiac output) - Decreased cardiac output (related to impaired contractility) - Anxiety (related to dyspnea, threat of death) Pharmacologic Summary for ADHF with Pulmonary Edema: | Intervention | Drug(s) | Dose (typical) | Mechanism | | Position & Oxygen | O₂ 6–15 L/min | High-flow via NRB | Improve SpO₂, reduce WOB | | Diuresis | Furosemide (Lasix) IV | 20–80 mg, repeat q2–4h | Loop diuretic, ↓ volume | | Vasodilation | NTG IV or nitroprusside | 0.5 mcg/kg/min, titrate | ↓ preload, ↓ afterload | | NIPPV | CPAP or BiPAP | 5–15 cmH₂O | Alveolar recruitment, ↓ WOB | | Inotropy (if shock) | Dobutamine, milrinone | 2–20 mcg/kg/min | ↑ contractility, ↓ resistance | Philippine Context: In Philippine emergency departments and public hospitals, acute pulmonary edema is common among patients with uncontrolled hypertension, valvular disease (rheumatic heart disease), and chronic heart failure without access to maintenance therapy. Rapid recognition and aggressive nursing intervention—positioning, oxygen, diuretics, and vasodilators—can mean the difference between discharge and intubation.

Anaphylaxis is a rapidly progressive, life-threatening systemic allergic reaction mediated by IgE-activated mast cells and basophils, releasing histamine, tryptase, leukotrienes, and prostaglandins. Onset is typically within minutes of antigen exposure. Anaphylaxis can evolve from mild urticaria to complete cardiovascular collapse and death in 15 minutes. Recognition and immediate epinephrine administration are the difference between survival and mortality. Pathophysiology: Mast cell/basophil degranulation releases mediators that cause: - Vasodilation (histamine and prostanoids → increased vascular permeability, peripheral vasodilation) - Airway edema and bronchoconstriction (histamine, leukotrienes → laryngeal edema, angioedema, bronchial smooth muscle contraction) - Increased myocardial irritability and decreased contractility - GI smooth muscle contraction and increased mucosal permeability The result is distributive shock (from vasodilation and capillary leak), airway obstruction, and respiratory compromise. Clinical Presentation (Recognizing the Pattern): Anaphylaxis involves two or more organ systems: 1. Cutaneous (most common): Urticaria (hives), flushing, pruritus, angioedema (lip and tongue swelling) 2. Respiratory: Stridor (laryngeal edema), wheezing (bronchospasm), dyspnea, chest tightness, cough 3. Cardiovascular: Hypotension, tachycardia, syncope, shock, arrhythmias, cardiac arrest 4. Gastrointestinal: Cramping, nausea, vomiting, diarrhea, abdominal pain 5. Neurologic: Anxiety, confusion, lightheadedness, loss of consciousness 6. Ocular: Conjunctival injection, lacrimation, eyelid edema Severity spectrum: - Mild: Localized urticaria, mild pruritus (not true anaphylaxis; may be acute allergic reaction) - Moderate: Urticaria + respiratory symptoms (wheezing, stridor) or mild hypotension - Severe: Respiratory distress, hypotension, altered consciousness, or multi-system involvement Common Triggers: - Food (peanuts, tree nuts, shellfish, fish, milk, eggs) - Medications (penicillins, cephalosporins, NSAIDs, ACE inhibitors, aspirin) - Insect stings (hymenoptera: bees, wasps, hornets) - Latex (from gloves, catheters, equipment) - Radiocontrast media - Exercise (food-dependent exercise-induced anaphylaxis) Priority Intervention—Epinephrine (This Cannot Be Overstated): **Epinephrine is the single, definitive treatment for anaphylaxis. Do not delay it. Do not substitute antihistamines or corticosteroids for epinephrine.** Dose and Route: **Intramuscular (IM) epinephrine 0.3 to 0.5 mg (1:1000 concentration) into the anterolateral thigh (vastus lateralis muscle).** This is the preferred route because: - IM administration provides rapid absorption and sustained delivery - The anterolateral thigh allows large muscle mass and good vascularization - IM is safer than IV in acute settings (IV risks bolus overdose, severe hypertension, and arrhythmias) - Patients remain upright and breathing during IM administration Timing: Repeat every 5 to 15 minutes as needed if symptoms persist. Most patients respond to one dose; some require 2–3 doses over 15–30 minutes. Epinephrine's Actions (Why It Works): - Alpha-1 adrenergic effect: Peripheral vasoconstriction, counteracts vasodilation and restores BP, reduces airway edema - Beta-1 adrenergic effect: Increases heart rate and contractility, improves cardiac output - Beta-2 adrenergic effect: Bronchodilation, relieves bronchoconstriction and airway obstruction - Inhibits mast cell and basophil mediator release, halting the anaphylactic cascade Adjunctive Measures (Secondary to Epinephrine): After epinephrine is given, administer: 1. High-flow oxygen: 6–15 L/min via non-rebreather or bag-valve-mask if needed; target SpO₂ ≥94%. 2. IV access: Establish large-bore IV lines (two if possible); begin normal saline infusion (20 mL/kg bolus initially, then ongoing infusion). Aggressive IV fluids replace volume lost to capillary leak and maintain perfusion. 3. Antihistamines: H1 receptor antagonist (diphenhydramine 25–50 mg IV or IM) and H2 receptor antagonist (ranitidine 50 mg IV or famotidine 20 mg IV) reduce pruritus and cutaneous manifestations. Antihistamines do NOT reverse the anaphylactic cascade and should never delay or replace epinephrine. 4. Corticosteroids: Methylprednisolone 1–2 g IV or hydrocortisone 500 mg–1 g IV. These blunt the late-phase reaction (biphasic anaphylaxis, discussed below) and reduce inflammation. They have no immediate effect in the acute phase. 5. Bronchodilators: If wheezing persists despite epinephrine, add nebulized albuterol (salbutamol) 2.5–5 mg. 6. Antiemetics: Metoclopramide 10 mg IV if vomiting is problematic. Positioning: - If hypotensive: supine with legs elevated 30 degrees (increases venous return to the heart, improving preload). - If respiratory distress: semi-upright (45 degrees) or higher, as tolerated. - For a patient with abdominal pain and nausea, a left lateral decubitus position may be comfortable. - Once epinephrine takes effect and BP stabilizes, allow the patient to assume a comfortable position. Airway Considerations: Angioedema of the airway is a hallmark of anaphylaxis and can progress rapidly to complete obstruction. Early recognition and decisive action are critical: - If stridor or difficulty with phonation/swallowing is present, anticipate airway swelling. - Prepare for airway management: have suction, equipment for bag-valve-mask ventilation, and intubation supplies readily available. - Consider early intubation if airway edema is worsening (do not wait for complete obstruction). A smaller-diameter endotracheal tube may be needed due to subglottic edema. - If complete airway obstruction occurs before an airway can be secured, emergency cricothyrotomy or tracheostomy may be needed. Monitoring During Acute Phase: - Continuous cardiac monitoring (risk of arrhythmias) - Pulse oximetry - Blood pressure every 2–5 minutes for the first 30 minutes, then every 15 minutes - Respiratory assessment: stridor, wheezing, RR, work of breathing - Neurologic status: consciousness, orientation - Skin: urticaria resolution, angioedema improvement - Document the timeline of onset, symptoms, and response to treatment **Biphasic Anaphylaxis**: In 5–15% of anaphylaxis cases, symptoms recur 1 to 72 hours (most commonly 8–12 hours) after initial resolution. This is biphasic anaphylaxis and reflects late-phase mediator release (cytokines, leukotrienes from infiltrating eosinophils and neutrophils). Management is the same: epinephrine for recurrent symptoms, plus continued IV fluids and corticosteroids. This is why anaphylaxis patients must be observed for 24–48 hours and NOT immediately discharged. This concept appears on the NLE. Critical Dosing Distinction—Anaphylaxis vs. Cardiac Arrest: **This is a high-yield NLE point and a dangerous error if confused.** - Anaphylaxis: 0.3–0.5 mg IM of 1:1000 epinephrine - Cardiac arrest (ACLS): 1 mg IV of 1:10,000 epinephrine (diluted for IV use) The concentrations and routes differ dramatically; confusion leads to underdosing in anaphylaxis or overdosing in cardiac arrest. Memorize both. Nursing Diagnoses (NANDA-I): - Risk for airway compromise (related to laryngeal edema, angioedema) - Ineffective breathing pattern (related to bronchoconstriction, bronchospasm) - Decreased cardiac output (related to distributive shock secondary to vasodilation, capillary leak) - Anxiety (related to respiratory distress, fear of death) - Risk for anaphylaxis recurrence (biphasic reaction) Pharmacology Reference Table—Anaphylaxis Management: | Intervention | Drug | Dose (Adult) | Route | Timing | | --- | --- | --- | --- | --- | | First-line | Epinephrine 1:1000 | 0.3–0.5 mg | IM (anterolateral thigh) | Immediately; repeat q5–15min | | Oxygen | O₂ | 6–15 L/min | High-flow | Concurrent with epi | | IV Fluids | Normal saline | 20 mL/kg bolus, then ongoing | IV | Immediately after epi | | Antihistamine (H1) | Diphenhydramine | 25–50 mg | IV/IM | After epi and fluids | | Antihistamine (H2) | Ranitidine or famotidine | 50 mg or 20 mg | IV | After H1 blocker | | Corticosteroid | Methylprednisolone or hydrocortisone | 1–2 g or 500 mg–1 g | IV | After epi and antihistamines | | Bronchodilator (if wheezing) | Albuterol (salbutamol) | 2.5–5 mg | Nebulized | If wheezing persists | Philippine Practice and Public Health Context: In the Philippines, anaphylaxis is often encountered in emergency departments without immediate access to epinephrine auto-injectors. Patient education on allergen avoidance, recognition of early symptoms, and the critical importance of seeking immediate care are essential components of discharge teaching. For patients with known severe allergies, prescription for epinephrine auto-injectors (EpiPen, Auvi-Q) and training in self-administration can be lifesaving.

A hypertensive crisis is defined as severely elevated blood pressure—generally systolic ≥180 mmHg or diastolic ≥120 mmHg—in the setting of acute end-organ damage or at imminent risk thereof. The key distinction is understanding that NOT all severely elevated blood pressures require emergent IV treatment. Rushed or excessive BP reduction causes strokes, heart attacks, and renal infarction. Definitions and Pathophysiology: 1. Hypertensive Urgency: Severe elevation of BP (SBP ≥180, DBP ≥120) WITHOUT evidence of acute target-organ damage. Examples include uncontrolled essential hypertension, medication non-adherence, or pain-related hypertension. Treatment is elective oral antihypertensives over 24–48 hours; no need for IV agents or intensive care monitoring. 2. Hypertensive Emergency (Hypertensive Crisis with Target-Organ Damage): Severe BP elevation WITH evidence of acute end-organ ischemia or injury. Manifestations include: - Hypertensive encephalopathy: Headache (often occipital), confusion, seizures, coma, visual disturbances (from cerebral edema and disruption of cerebral autoregulation) - Acute coronary syndrome or acute MI: Chest pain, ischemic changes on ECG - Acute heart failure and pulmonary edema: Dyspnea, crackles, pink frothy sputum - Aortic dissection: Severe "tearing" chest or back pain, BP differential between arms, pulse deficits - Acute kidney injury: Elevated creatinine, hematuria, oliguria, uremia - Acute stroke (hemorrhagic or ischemic): Focal neurologic deficit, decreased consciousness - Eclampsia or preeclampsia with severe features: In pregnant women, severe hypertension with symptoms of end-organ damage (seizures, headache, epigastric pain, visual changes, elevated transaminases, thrombocytopenia) Understanding Cerebral Autoregulation: In normotensive individuals, cerebral blood flow remains constant despite changes in MAP between 50 and 150 mmHg via autoregulation (cerebral arterioles constrict or dilate to maintain constant flow). In chronic hypertension, this autoregulatory curve shifts rightward; the chronically hypertensive brain tolerates higher pressures and can lose perfusion if pressure is dropped too rapidly. Sudden, aggressive pressure reduction causes the cerebral vasculature to constrict maximally (already narrowed by chronic disease), reducing cerebral blood flow and causing ischemic stroke. The Fundamental Principle: GRADUAL Reduction of Blood Pressure **The goal is to reduce MAP (mean arterial pressure) by approximately 10–15% (or no more than 25%) in the FIRST HOUR, then more gradually over 24 hours.** This allows the cerebral and renal vasculature to re-establish autoregulation. Exceptions exist (aortic dissection, eclampsia), where faster control is needed, but even then the BP is reduced over minutes to hours, not seconds. MAP calculation: MAP = (SBP + 2 × DBP) / 3 Example: SBP 180, DBP 120 → MAP = (180 + 240) / 3 = 140 mmHg Target reduction: 140 − (0.10 to 0.15 × 140) = 119–126 mmHg (a reduction of 14–21 mmHg) First-Line IV Agents for Hypertensive Emergency: 1. **Labetalol**: An alpha and non-selective beta blocker; initial dose 10–20 mg IV push, repeated every 10 minutes up to 80 mg per dose (or 300 mg total), then transitioned to oral labetalol. Onset 5–10 minutes, duration 3–6 hours. Advantages: combined alpha/beta effect, no reflex tachycardia, maintains or improves renal and cerebral blood flow. Cautions: avoid in decompensated heart failure (negative inotrope) and asthma/COPD (bronchospasm risk). 2. **Nicardipine**: A dihydropyridine calcium-channel blocker; given as a continuous IV infusion (initial 5 mg/hr, titrated by 2.5 mg/hr every 5–15 minutes to a maximum of 15 mg/hr). Onset 5–10 minutes, duration 1–4 hours. Advantages: titratable, excellent for ischemic stroke and some coronary syndromes, no reflex tachycardia at lower doses. Caution: reflex tachycardia at higher doses; avoid if rapid pressure reduction is contraindicated (e.g., aortic dissection). 3. **Sodium Nitroprusside**: A direct vasodilator (acts on both arterioles and venules); given as a continuous IV infusion (initial 0.3 mcg/kg/min, titrated every few minutes to a maximum of 8–10 mcg/kg/min). Onset is immediate, duration 1–2 minutes (very short-acting). Advantages: potent, rapid titration, suitable for most hypertensive emergencies. Cautions: requires ICU monitoring; risk of hypotension if titrated too aggressively; risk of thiocyanate and cyanide toxicity with prolonged use (>4–8 hours) or renal failure; not first-line if longer action is desired; causes reflex tachycardia if not paired with beta-blockade. 4. **Esmolol**: A selective beta-1 blocker; given as a bolus (80 mg IV over 30 seconds) followed by infusion (150 mcg/kg/min, titrated up to 300 mcg/kg/min). Onset 1–2 minutes, very short duration (9–20 minutes). Used for tachycardia-associated hypertensive emergencies. Cautions: avoid in bradycardia, heart block, decompensated heart failure. 5. **Hydralazine**: A direct arteriolar vasodilator; given as 5–10 mg IV push, repeated every 20–30 minutes, or continuous infusion. Slower onset (10–20 min), longer duration (4–6 hours), and unpredictable response make it less preferred for acute titration. However, it remains useful in eclampsia and some protocols. Reflex tachycardia is common. 6. **Immediate-release oral nifedipine (short-acting)**: CAUTION — sublingual immediate-release nifedipine is associated with unpredictable, precipitous drops in BP and stroke risk; it is no longer recommended for acute hypertensive crisis and is contraindicated in acute stroke. Special Scenarios: **Hypertensive Crisis with Acute Ischemic Stroke:** - The hypertension is often reactive (compensation for decreased cerebral perfusion). - If BP >220/120 mmHg or MAP >130 mmHg, cautious reduction (lower by 10–15%) is done to prevent ischemic extension. - IV labetalol or nicardipine are preferred; avoid rapid reduction. - Thrombolytic therapy (tPA) eligibility requires BP control (SBP ≤185, DBP ≤110) before administration. **Hypertensive Crisis with Acute Hemorrhagic Stroke:** - Rapid reduction (goal SBP ≤140 mmHg, achieved within 1 hour) is warranted to reduce hematoma expansion. - Labetalol and nicardipine are used, with faster titration than in ischemic stroke. **Hypertensive Crisis with Aortic Dissection:** - Requires both rapid BP and heart-rate control (goal HR ≤60 bpm, SBP ≤120 mmHg, typically achieved within 20 minutes). - Beta-blocker first (esmolol or labetalol) to reduce contractility and shear forces, then vasodilator (nicardipine or nitroprusside) for additional BP reduction. - The sequence matters: vasodilator alone causes reflex tachycardia and increased shear, worsening dissection. **Eclampsia/Severe Preeclampsia:** - Magnesium sulfate is given for seizure prophylaxis (IV bolus 4–6 g over 20–30 min, then infusion 1–2 g/hr). - IV labetalol or immediate IV hydralazine is used for acute BP reduction; goal is to lower BP by ~10–15% initially, then more gradually. - Delivery of the fetus and placenta is definitive treatment; antihypertensive agents are temporizing only. Monitoring During Acute Treatment: - Continuous BP monitoring (ideally via arterial line in ICU) with frequent assessments (every 5–15 minutes during titration). - Frequent neurologic checks: consciousness, orientation, focal deficits, pupil size and reactivity. Worsening neuro status suggests stroke and warrants immediate review and possible BP adjustment. - Continuous cardiac monitoring (risk of ischemia, arrhythmias). - Urine output (target ≥0.5 mL/kg/hr); oliguria suggests renal hypoperfusion. - Renal function (creatinine, BUN) and urine microscopy (hematuria, proteinuria suggest acute kidney injury). - Labs: CBC, electrolytes, renal function, ECG, urinalysis. - Head imaging (CT or MRI) if neurologic symptoms, to rule out stroke or intracranial hemorrhage. - ECG to assess for ischemia or LVH. Nursing Actions: - Establish two large-bore IV lines (one for antihypertensive agent, one for additional fluids/medications if needed). - Place on continuous monitoring and pulse oximetry. - Keep NPO initially (risk of aspiration if altered mental status). - Provide a calm, quiet environment (minimize stimulation, which can raise BP further). - Explain the treatment plan to the patient and family; reassure that the goal is gradual, safe reduction. - Document BP, HR, symptom response, and neuro status frequently (every 15 minutes). - Anticipate complications: ischemic or hemorrhagic stroke (sudden neuro change), acute MI, cardiogenic shock, acute kidney injury. Transition from IV to Oral: Once the acute crisis is controlled and the patient is stable, transition to oral antihypertensives: - Agents used during acute phase often have corresponding oral formulations (e.g., labetalol, nicardipine, hydralazine). - Restart home medications or add new ones based on the underlying cause and comorbidities. - Avoid abrupt discontinuation of IV agents; taper gradually as oral agents are uptitrated. Nursing Diagnoses (NANDA-I): - Ineffective tissue perfusion (cerebral, coronary, renal) related to severely elevated BP or rapid BP reduction - Risk for stroke (related to acute hypertension or overly aggressive reduction) - Acute pain (related to hypertensive headache, chest pain, or underlying cause) - Anxiety (related to acute symptoms, treatment, fear) Pharmacology Summary Table—Hypertensive Emergency Agents: | Agent | Dose | Route | Onset | Duration | Advantages | Cautions | | --- | --- | --- | --- | --- | --- | --- | | Labetalol | 10–20 mg q10min (max 80 mg/dose) | IV | 5–10 min | 3–6 hr | Alpha/beta, no reflex tachy, safe cerebral perfusion | Avoid in CHF, asthma | | Nicardipine | 5 mg/hr initial, titrate by 2.5 mg/hr q5–15min (max 15 mg/hr) | IV infusion | 5–10 min | 1–4 hr | Titratable, safe in CAD/stroke | Reflex tachy at high doses | | Nitroprusside | 0.3 mcg/kg/min initial, titrate q few min (max 8–10 mcg/kg/min) | IV infusion | Immediate | 1–2 min | Potent, rapid titration | ICU only, cyanide risk if prolonged | | Esmolol | 80 mg bolus over 30 sec, then 150 mcg/kg/min infusion | IV | 1–2 min | 9–20 min | Very rapid offset, good for tachy | Contraindicated in bradycardia, CHF | | Hydralazine | 5–10 mg q20–30min | IV push | 10–20 min | 4–6 hr | Safe in eclampsia | Unpredictable, reflex tachy | Philippine Healthcare Context: In Philippine emergency departments and provincial hospitals, hypertensive emergency is common among patients with inadequate control of chronic hypertension, often due to lack of access to medications or awareness of the condition. Careful nursing management—gradual BP reduction, close monitoring, and clear documentation—can prevent devastating complications (stroke, MI, acute kidney injury) and is central to emergency care quality.

An acute abdomen describes the sudden onset of severe abdominal pain signaling a surgical emergency requiring urgent diagnosis and possible operative intervention. The underlying cause may be intra-abdominal inflammation (appendicitis, diverticulitis, cholecystitis), perforation (perforated viscus releasing contents and bacteria into the peritoneum), obstruction (mechanical blockage of bowel), vascular emergency (mesenteric ischemia, ruptured aortic aneurysm), or gynecologic crisis (ruptured ectopic pregnancy, ovarian torsion). The priority is not to diagnose the specific condition in the ER but to recognize the pattern, stabilize the patient, and prepare rapidly for diagnostic imaging and possible surgery. Pathophysiology Overview: Sudden visceral inflammation, perforation, or obstruction triggers: - Local peritoneal irritation and inflammation (causing localized pain and tenderness) - Systemic inflammatory response (cytokine release, fever, WBC elevation) - Fluid sequestration in the bowel (if obstruction) or peritoneum (if perforation or inflammation), leading to hypovolemia and shock - Bacterial translocation and peritonitis (if perforation or ischemia) - Potential bacteremia and septic shock if untreated Clinical Presentation—The "Surgical Abdomen": Warning signs that signal a surgical emergency include: 1. **Severe, acute-onset pain**: The patient often remembers the exact moment it started. Pain may be colicky (cramping, intermittent, suggesting obstruction) or constant (suggesting perforation, ischemia, or inflammation). 2. **Abdominal wall findings**: - **Rigidity**: A hard, board-like abdomen suggests peritonitis (inflammation of the peritoneum from perforation, ischemia, or severe inflammation). The abdominal wall muscles are involuntarily contracted. - **Guarding**: Voluntary muscle contraction in response to pain; distinguishable from rigidity by deep palpation during inspiration (guarding worsens; true rigidity persists). - **Rebound tenderness**: Pain that worsens when the examiner's hand is suddenly released from deep palpation, suggesting peritoneal irritation. - **Distension**: Abdominal swelling from bowel gas (obstruction) or fluid (ascites, hemorrhage). 3. **Absence of bowel sounds or high-pitched, tinkling sounds**: Absent sounds suggest peritonitis or late-stage obstruction; high-pitched, tinkling sounds suggest early obstruction (bowel trying to push past the blockade). 4. **Systemic signs of shock**: - Hypotension (from hypovolemia or sepsis) - Tachycardia (>100 bpm, from pain, hypovolemia, or sepsis) - Fever (from inflammation or infection) - Tachypnea and altered mental status (from metabolic acidosis or sepsis) - Pale, clammy skin (from shock) 5. **Vomiting**: Bilious or feculent (foul-smelling, suggesting fecal content in the stomach from obstruction with incompetent ileocecal valve), bloody, or coffee-ground material. 6. **Absence of flatus or stool**: Suggests obstruction or ileus (functional obstruction from peritonitis or sepsis). Common Surgical Emergencies: - **Perforated peptic ulcer**: Sudden onset of severe epigastric pain, rigidity, shock; free air under the diaphragm on chest X-ray (pneumoperitoneum) - **Appendicitis**: Periumbilical pain migrating to RLQ, with RLQ tenderness (McBurney's point), fever, elevated WBC - **Small bowel obstruction**: Colicky pain, distension, vomiting, absent stool; plain abdominal X-ray shows dilated small bowel loops with air-fluid levels - **Large bowel obstruction**: Often more insidious; constipation, distension, cramping; risk of cecal perforation if not relieved - **Mesenteric ischemia**: Acute severe abdominal pain out of proportion to physical exam findings; high mortality if diagnosis is delayed; suspect in elderly patients with cardiac disease (source of emboli) or severe atherosclerosis - **Ruptured aortic aneurysm (AAA)**: Sudden, tearing back and flank pain, hypotension, pulsatile abdominal mass (if palpable); exsanguinating hemorrhage into retroperitoneum; medical emergency requiring immediate vascular surgery - **Ruptured ectopic pregnancy**: In a woman of childbearing age with sudden lower abdominal pain, amenorrhea or abnormal vaginal bleeding, and positive pregnancy test; intra-abdominal hemorrhage; can rapidly progress to shock and death Priority Nursing Interventions: 1. **Keep NPO (Nothing by Mouth)**: - If surgery is likely, the patient must fast (no food, fluids, or medications) to reduce aspiration risk during anesthesia and intubation. - Explain this to the patient and family; document the time of last oral intake. - If the patient has already eaten, inform the anesthesia team; this affects anesthetic choice and induction sequence. 2. **Establish IV Access and Begin Fluid Resuscitation**: - Insert two large-bore peripheral IV lines (or central line if needed for rapid volume replacement). - Initiate normal saline or lactated Ringer's infusion; begin with a 20 mL/kg bolus in cases of hypotension or suspected hemorrhage, then continue based on BP, heart rate, and urine output. - Monitor for signs of adequate perfusion: urine output ≥0.5 mL/kg/hr, normalized BP, normalized HR, warm skin, alert mentation. - In hemorrhagic shock (suspected AAA rupture, ruptured ectopic), consider massive transfusion protocol (1:1 ratio of RBC to FFP to platelets if available) to prevent coagulopathy. 3. **Assess and Monitor Pain and Vital Signs**: - Obtain baseline vital signs (BP, HR, RR, temperature, oxygen saturation). - Reassess vitals every 15 minutes (or more frequently if shock is present). - Assess pain using a standardized scale; note location, character (colicky vs. constant), severity, and any radiation. - Do NOT withhold pain assessment or adequate analgesia out of fear of "masking" findings; modern surgical practice supports appropriate analgesia. The principal concern is that the patient communicate clearly during clinical examination and not lie still due to severe pain (which paradoxically makes abdominal assessment harder). Once the initial assessment and imaging are completed, IV opioids (morphine, fentanyl) can be used safely. 4. **Prepare for Diagnostics and Surgery**: - Alert radiology for urgent imaging (abdominal X-ray, CT scan, or ultrasound as appropriate). - Maintain IV access and fluid infusion during transport to radiology. - Prepare for potential operating room: ensure surgical team is aware, arrange for blood type and cross-match, ensure anesthesia availability. - Insert a urinary catheter to monitor urine output and assess renal perfusion (unless contraindicated, e.g., suspected urethral injury). - Insert a nasogastric (NG) tube if ordered for bowel decompression (in obstruction) to relieve distension and reduce aspiration risk. 5. **Infection Prevention and Prophylaxis**: - Obtain blood cultures before antibiotics (if sepsis is suspected). - Administer broad-spectrum antibiotics per protocol (typically within 1 hour of diagnosis of acute abdomen) to cover gram-negative and anaerobic organisms. Common regimens include cefoxitin, piperacillin-tazobactam, or metronidazole plus a fluoroquinolone or aminoglycoside. - In the OR, surgical prophylaxis (single-dose antibiotic before incision, redosed intraoperatively if the procedure is prolonged) prevents surgical site infection. 6. **Absolute Contraindications—What NOT to Do**: - **Never apply heat to the abdomen**: Heat promotes inflammation and can rupture an inflamed appendix, spreading infection throughout the peritoneum. - **Never give a laxative or enema**: These increase intraluminal pressure and can perforate an obstructed or inflamed bowel. - **Never make light of the pain or delay imaging/surgery**: Acute abdomen progresses rapidly; delays in diagnosis increase mortality and morbidity. - **Never discharge a patient with a suspected acute abdomen without definitive imaging and surgical clearance**. 7. **Position for Comfort**: - Allow the patient to assume whatever position is most comfortable (often knees bent to reduce abdominal wall tension). - Do not force the patient into a supine position for assessment if it is very painful; flexibility improves cooperation. Nursing Diagnoses (NANDA-I): - Acute pain (related to abdominal inflammation, obstruction, or perforation) - Deficient fluid volume (related to third-spacing, hemorrhage, or vomiting) - Risk for hypovolemic shock (related to hemorrhage, sequestration, or fluid loss) - Nausea (related to bowel obstruction or peritonitis) - Risk for infection (related to perforation and peritonitis, or surgical intervention) Laboratory and Imaging Findings: - **Labs**: CBC (elevated WBC suggests infection/inflammation), BMP (assess electrolytes; elevated creatinine suggests dehydration), lactate (elevated in shock, ischemia), blood cultures (if septic), coagulation studies (if hemorrhage). - **Imaging**: Upright chest X-ray (pneumoperitoneum from perforation appears as free air under the diaphragm); abdominal X-ray (obstruction shows dilated loops with air-fluid levels, or absence of bowel gas); CT abdomen/pelvis (most sensitive; reveals inflammation, obstruction, perforation, AAA, ectopic pregnancy); ultrasound (operator-dependent; useful for appendicitis, AAA diameter, free fluid/blood). Special Consideration—Ruptured AAA: A ruptured abdominal aortic aneurysm (AAA >3 cm diameter) presents as a medical catastrophe: sudden back or flank pain, hypotension, and shock. Mortality is 50–80% even with immediate surgical intervention. Management includes massive transfusion, rapid transfer to an OR with vascular surgery capability, and emergency operative repair. Prehospital care emphasizes rapid transport over prolonged resuscitation ("scoop and run"); in-hospital, permissive hypotension (target SBP 90–100) may be used until the patient reaches the OR (to avoid dislodging thrombus and increasing hemorrhage). Philippine Healthcare Context: In Philippine emergency departments, acute abdominal conditions are common, and many patients present late (advanced peritonitis, sepsis). Rapid recognition, IV fluids, antibiotics, and coordination with surgery can reduce mortality. The principle of avoiding heat, laxatives, and delays is especially important in resource-limited settings where imaging may be delayed.

Diabetes mellitus complications can range from asymptomatic hyperglycemia to life-threatening metabolic crises. The two acute extremes—hypoglycemia (dangerously low glucose) and diabetic ketoacidosis (DKA) or hyperosmolar hyperglycemic state (HHS, related to DKA but occurring in type 2 diabetes)—require fundamentally different and time-sensitive interventions. Confusing the two or delaying treatment can result in brain damage, coma, or death. **HYPOGLYCEMIA: Rapid Onset, More Immediately Dangerous** Definition: Blood glucose below approximately 70 mg/dL (3.9 mmol/L). However, symptoms and risk vary by individual; some diabetics adapted to chronic hyperglycemia may not feel symptomatic until <50 mg/dL, while others become symptomatic at higher levels. If the patient reports symptoms consistent with hypoglycemia, treat presumptively without waiting for a glucose reading. Pathophysiology: The brain depends almost exclusively on glucose for energy and has minimal glycogen stores. Within minutes of hypoglycemia, the brain is starved of fuel. The body responds with sympathetic activation (adrenaline surge) and, if uncorrected, cerebral dysfunction progresses. Clinical Presentation—Progression from Mild to Severe: **Adrenergic (Sympathetic) Symptoms (Earlier):** - Tremor, shakiness - Palpitations, tachycardia - Sweating (diaphoresis) - Anxiety, nervousness - Hunger - Paresthesias (tingling lips or fingers) **Neuroglycopenic Symptoms (Brain glucose deprivation—Later, More Dangerous):** - Difficulty concentrating, confusion, irritability - Slurred speech, difficulty speaking - Blurred vision - Headache - Weakness, fatigue - Lethargy, drowsiness - Seizures (if severe and prolonged) - Coma - Death (if untreated) Critical Clinical Pearl: A patient may transition from apparently alert to unconscious or seizing within 15–30 minutes if hypoglycemia is not corrected. This is more immediately dangerous than the gradual onset of DKA. Treatment—The "Rule of 15": **For a conscious patient who can safely swallow:** 1. Give **15 grams of fast-acting, simple carbohydrate** (oral glucose, not complex carbs which are absorbed slowly): - Glucose tablets (3–4 tablets) - 4 oz (120 mL) of juice or soda (non-diet) - 5–6 hard candies - 1 tablespoon honey or corn syrup - 1/2 cup of low-fat milk (lactose = glucose + galactose, absorbed faster than other disaccharides) 2. **Recheck blood glucose in 15 minutes**. 3. **If still <70 mg/dL, repeat the 15-gram dose**. 4. Once glucose normalizes (>70 mg/dL) AND the patient is fully alert and able to eat, give a **complex carbohydrate plus protein** (to sustain glucose and prevent recurrence): - Bread with peanut butter - Milk and crackers - A balanced meal **Rationale for 15 grams:** Small enough to not cause hyperglycemia overshoot, large enough to raise glucose measurably (typically by 15–20 mg/dL in the first 15 minutes), allowing time to reassess. This prevents overcorrection, which can cause rebound hyperglycemia and complications from swinging glucose levels. **For an unconscious patient or one who cannot swallow safely (altered mental status, seizing, risk of aspiration):** NEVER give oral carbohydrate to a patient who is not fully alert and able to protect their airway. Risk of aspiration is extreme. Instead: **Option 1: Intravenous Dextrose** - **D50W (50% dextrose solution): 25 g IV push (50 mL of D50W) over 1–3 minutes through a large-bore IV** - Onset: within 1–3 minutes; glucose rises rapidly - Monitor for extravasation; D50W is hypertonic and causes severe tissue damage if infiltrated; use a central line if available for safety - After IV dextrose, the patient may regain consciousness within minutes; provide reassurance and a complex carbohydrate once fully alert **Option 2: Intramuscular Glucagon** - **Glucagon 1 mg IM into the anterolateral thigh or deltoid** - Mechanism: Glucagon stimulates hepatic glycogenolysis and gluconeogenesis, raising blood glucose - Onset: 5–15 minutes; slower than IV dextrose - Duration: 12–27 minutes; if glucose does not rise sufficiently, a second dose can be given, or IV dextrose may be needed - Advantage: IM route is easier in prehospital or out-of-hospital settings (no IV needed) - Disadvantage: requires an intact liver with adequate glycogen stores (may be ineffective in chronic liver disease, malnutrition, or prolonged hypoglycemia) - Nausea and vomiting are common side effects Monitoring and Follow-up: - Reassess mental status and obtain repeat glucose in 15 minutes after initial treatment. - Monitor for symptoms of hypoglycemia recurrence (may need further glucose, IV dextrose, or continuous IV dextrose infusion in ICU if recurrent or refractory). - Investigate the cause: missed meal, excessive insulin, new medication, infection, renal failure. Address the underlying trigger to prevent recurrence. - For insulin-treated patients, consider dosing adjustments with the diabetes team before discharge. - Patient education: signs/symptoms of hypoglycemia, use of glucose meters, carrying fast-acting carbohydrate at all times, medical alert identification. Nursing Diagnoses (Hypoglycemia): - Acute confusion (related to cerebral glucose deprivation) - Risk for injury (related to altered mental status, seizures) - Risk for aspiration (if unconscious and attempted oral feeding) --- **DIABETIC KETOACIDOSIS (DKA): Gradual Onset, Metabolic Derangement** Definition: A hyperglycemic emergency, predominantly in type 1 diabetes (though it can occur in type 2 in severe stress), caused by insulin deficiency. Without insulin, cells cannot take up glucose; hyperglycemia develops. Simultaneously, without insulin's inhibitory effect, lipolysis accelerates, releasing free fatty acids. The liver converts fatty acids to ketones (beta-hydroxybutyrate, acetoacetate), which accumulate. Accumulation of ketones generates a metabolic acidosis, and hyperglycemia causes an osmotic diuresis, leading to profound dehydration and electrolyte losses. Pathophysiology in Summary: Insulin deficiency → ↑ Glucose (hyperglycemia) + ↑ Ketones (ketonemia) + ↓ pH (acidosis) + ↑ Osmolarity + Osmotic diuresis Clinical Presentation—Gradual Onset (Hours to Days): **Laboratory Findings (Diagnostic Triad):** - **Hyperglycemia**: Blood glucose usually >250 mg/dL (often 300–600 mg/dL or higher) - **Ketonemia and ketonuria**: Elevated serum or urine ketones (beta-hydroxybutyrate, acetoacetate) - **Metabolic acidosis**: Low pH (<7.35), low HCO3− (<18 mEq/L), elevated anion gap (normally 8–12; in DKA, >12) **Clinical Symptoms and Signs (Onset over Hours to Days):** - **Polyuria and polydipsia**: Osmotic diuresis from hyperglycemia; patient urinates frequently and drinks large volumes - **Fatigue, malaise, weakness**: From dehydration, electrolyte shifts, and acidosis - **Nausea and vomiting**: From acidosis (stimulates chemoreceptors) - **Abdominal pain**: Hepatic edema, peritoneal irritation from ketones; can mimic acute abdomen (diagnostic challenge) - **Kussmaul respirations** (CRITICAL SIGN): Deep, rapid, labored breathing (tachypnea with normal or low-normal oxygen saturation) to compensate for metabolic acidosis by hyperventilating to blow off CO₂; produces a characteristic pattern (increased depth and rate, not shallow/rapid like in asthma) - **Fruity or acetone breath odor**: From exhaled ketones (acetone); patient or family may report this - **Altered mental status**: Ranging from lethargy and confusion to coma in severe cases - **Dehydration**: Dry mucous membranes, poor skin turgor, orthostatic hypotension, weak pulses - **Tachycardia**: Compensation for hypovolemia and metabolic derangement Triggers for DKA: - New-onset type 1 diabetes (DKA may be the first presentation) - Insulin omission or inadequate dosing - Infection (pneumonia, UTI, appendicitis) - Acute illness (MI, stroke, sepsis) - Stress, surgery, trauma - Medication non-adherence - Pregnancy complications Severity Classification: - **Mild DKA**: pH 7.25–7.30, HCO3− 15–18 mEq/L, alert mental status - **Moderate DKA**: pH 7.00–7.24, HCO3− 10–14 mEq/L, alert or slightly drowsy - **Severe DKA**: pH <7.00, HCO3− <10 mEq/L, stupor or coma; high mortality Management Priority: Fluids First, Then Insulin, Then Potassium The management sequence is critical and differs from hypoglycemia: **1. FLUIDS (First):** Dehydration in DKA is severe, often 5–10 L of total body water deficit (from osmotic diuresis and vomiting). Volume depletion drives shock and worsens kidney function. Insulin cannot work without adequate hydration and perfusion. - **Initial bolus**: 15–20 mL/kg of normal saline IV over 1 hour to restore circulating volume (typically 1–1.5 L in a 70 kg adult) - **Subsequent infusion**: 0.9% normal saline at 500–1,000 mL/hr, depending on severity, urine output, and vital signs, continued until glucose is ~250 mg/dL (then switch to D5 saline to prevent hypoglycemia while acidosis clears) - **Monitoring**: Hourly vital signs, urine output (goal ≥200 mL/hr), BMP every 2–4 hours to assess electrolytes, glucose, and renal function - **Hyperchloremic acidosis risk**: Prolonged normal saline can cause hyperchloremia (high chloride) and perpetuate acidosis; consider switching to 0.45% saline if volume is repleted and hyperchloremia develops **2. INSULIN (Second):** Insulin stops ketogenesis and lowers glucose. However, it is WITHHELD or delayed if the potassium is very low (<2.5 mEq/L) because insulin drives potassium into cells, worsening life-threatening hypokalemia. - **Continuous IV regular insulin infusion**: 0.1 unit/kg/hr (e.g., 7 units/hr for a 70 kg patient), titrated based on glucose response and electrolytes - Goal: Reduce glucose by 50–100 mg/dL per hour (gradual reduction prevents cerebral edema from rapid osmolarity shift) - Once glucose falls to ~250 mg/dL, reduce insulin to 0.02–0.05 unit/kg/hr and switch IV fluids to D5 0.45% saline to prevent hypoglycemia while acidosis continues to clear - Acidosis resolves slower than glucose; insulin must continue (at lower rates) until the anion gap closes and HCO3− rises **3. POTASSIUM (Third):** Total body potassium is depleted in DKA (from osmotic diuresis and vomiting), though serum K+ may be normal or even elevated initially (from acidosis, which causes K+ to shift out of cells). As insulin is given and acidosis corrects, K+ shifts back into cells, causing serum K+ to plummet. Severe hypokalemia (<2.5 mEq/L) causes cardiac arrhythmias and muscle weakness and is life-threatening. - **DO NOT START INSULIN if K+ is <2.5 mEq/L** (risk of fatal hypokalemia); replace potassium first - **Typical replacement**: Once K+ is >2.5 mEq/L, start KCl 20–40 mEq/L added to IV fluids (2 units insulin / 1 unit K, roughly) - **Monitoring**: Draw BMP every 2–4 hours initially; once K+ is stable (>3.5 mEq/L) and anion gap is closing, frequency can decrease - **Replace cautiously**: Potassium replacement via IV is dangerous (can cause hyperkalemia, arrhythmias); infuse slowly, no faster than 20 mEq/hr through a peripheral line, or 40 mEq/hr through a central line Additional Measures: - **Phosphate replacement**: Consider in severe DKA if phosphate is very low; phosphate depletion impairs the 2,3-DPG needed for oxygen delivery - **Sodium bicarbonate**: Rarely used; if given, only in severe acidosis (pH <6.9) and only to raise pH to 7.0–7.1 (risk of hyperkalemia, worsening hypokalemia as insulin is given, and paradoxical CSF acidosis) - **Infection workup**: Obtain cultures, urinalysis, chest X-ray to identify and treat underlying infection - **Monitoring for complications**: Cerebral edema (rare but fatal; presents as deteriorating mental status, headache, papilledema; avoid rapid glucose lowering and use dextrose-containing fluids once glucose is ~250 mg/dL), acute kidney injury, rhabdomyolysis, VTE Monitoring During DKA Management: - Vital signs: every 1–2 hours - Fingerstick glucose: every 1 hour (titrate insulin to keep glucose 200–300 mg/dL until acidosis clears) - BMP (electrolytes, glucose, renal function, HCO3−): every 2–4 hours initially - Venous or arterial blood gas: every 4–6 hours to assess pH and HCO3− - Urine output: should be ≥200 mL/hr; monitor for acute kidney injury - Continuous cardiac monitoring (risk of arrhythmias from electrolyte shifts) Resolution Criteria: - pH >7.30 and HCO3− >15 mEq/L (acidosis improved) - Anion gap <12 (normalized) - Glucose <200 mg/dL - Patient able to tolerate oral intake - Alert mental status Transition to Subcutaneous Insulin: Once the above criteria are met and the patient can eat, transition to subcutaneous insulin (basal-bolus regimen or insulin pump) with a 1–2 hour overlap of IV and SC insulin to prevent recurrence of DKA. Nursing Diagnoses (DKA): - Deficient fluid volume (related to osmotic diuresis) - Imbalanced nutrition: less than body requirements (related to nausea, vomiting, insulin deficiency) - Risk for electrolyte imbalance (especially hypokalemia) - Acute confusion (related to metabolic acidosis, dehydration) - Ineffective breathing pattern (related to Kussmaul compensatory hyperventilation) --- **HYPEROSMOLAR HYPERGLYCEMIC STATE (HHS): The Type 2 Equivalent** Definition: Occurs primarily in type 2 diabetes; characterized by severe hyperglycemia (often >600 mg/dL), very high serum osmolarity (>320 mOsm/L), and profound dehydration, but with MINIMAL ketosis and little to no metabolic acidosis. HHS is often unrecognized because the absence of Kussmaul respirations and acidosis can delay diagnosis. Pathophysiology: Type 2 diabetes retains some endogenous insulin, enough to suppress lipolysis and ketone production but insufficient to lower glucose. The result is extreme hyperglycemia and osmotic diuresis without the metabolic dysfunction of DKA. Clinical Presentation: - Extreme hyperglycemia (often 400–800+ mg/dL) - Profound dehydration (often more severe than in DKA) - Altered mental status (confusion, coma) from osmolarity and dehydration - No or minimal Kussmaul respirations (little to no acidosis) - No or minimal fruity breath odor (few ketones) - Often occurs in elderly, dehydrated patients, or those with limited access to water Management: Isdentical to DKA: **Fluids first → Insulin → Potassium** - Even more aggressive fluid replacement than DKA (often 10+ L needed) - Slower glucose reduction (risk of cerebral edema from rapid osmolarity shift) - Insulin at lower rates (often <0.1 unit/kg/hr) because some endogenous insulin is present - Same potassium monitoring and replacement Mortality in HHS is higher than DKA (10–15% vs. 1–5%) due to older age, comorbidities, and delayed recognition. Nursing Diagnoses (HHS): - Deficient fluid volume (related to osmotic diuresis) - Altered mental status (related to hyperglycemia, osmolarity, dehydration) - Risk for complications (acute kidney injury, VTE, infection) --- **Critical NLE Points—Hypoglycemia vs. DKA:** | Feature | Hypoglycemia | DKA | HHS | | --- | --- | --- | --- | | **Glucose Level** | <70 mg/dL | >250 mg/dL (usually 300–600) | >600 mg/dL | | **Onset** | Minutes to 15–30 min | Hours to days | Hours to days | | **Danger Timeline** | IMMEDIATE (brain damage in 15–30 min if untreated) | Gradual (hours allow time for treatment) | Gradual | | **Breathing** | Normal | Kussmaul (deep, rapid) | Normal or shallow | | **Breath Odor** | Normal | Fruity/acetone | Normal | | **pH** | Normal | Low (<7.30) | Normal or slightly low | | **Ketones** | Absent | Present (elevated) | Minimal/absent | | **Mental Status** | Confusion, seizures, coma | Confusion, coma | Coma, altered | | **Treatment** | FAST: 15 g fast carb (oral if alert) or IV dextrose (if unconscious) | SLOW: Fluids first (hrs), then insulin, then K+ replacement | | **Key Principle** | Speed is essential | Gradual, balanced approach to avoid complications | --- Philippine Healthcare Context: Diabetic emergencies are common in the Philippines, where diabetes prevalence is rising and access to insulin may be limited or inconsistent. Recognition of hypoglycemia signs and rapid treatment prevent mortality; recognition of DKA and HHS, coupled with available IV fluids and insulin, requires vigilance because early symptoms (nausea, fatigue) can be mistaken for a minor illness.