NLE Cardiovascular Nursing — Cardiovascular Assessment and DiagnosticsSummary

Concept

Cardiac Output and Its Determinants

Importance

This is a high-yield NLE concept. Questions frequently ask how specific conditions (hypovolemia, hypertension, inotropic agents) affect CO or its components. Mastery allows nurses to anticipate hemodynamic responses and prioritize interventions based on the nursing diagnosis (e.g., Decreased Cardiac Output, Ineffective Tissue Perfusion).

Concept

The Cardiac Conduction System and Electrophysiology

Importance

Essential for ECG interpretation, a major NLE topic. Nurses must recognize that SA node dysfunction, AV block, bundle branch block, and ectopic rhythms all reflect conduction system pathology. This knowledge informs priority nursing diagnoses such as Decreased Cardiac Output (related to dysrhythmia) and drives interventions (e.g., monitoring, pacing, medication administration).

Concept

Heart Sounds and Valvular Function

Importance

Auscultation is a core physical assessment skill tested on the NLE. Recognizing an S3 in an adult patient is a high-yield question—it signals heart failure and Fluid Volume Excess, necessitating diuretics, sodium restriction, and monitoring of weight and intake/output. The ability to systematically identify abnormal heart sounds supports accurate NANDA-I diagnosis labeling and prioritization.

Concept

Electrocardiogram (ECG) Interpretation

Importance

ECG interpretation is a cornerstone NLE topic. High-yield items include identifying STEMI (ST elevation + reciprocal changes), recognizing hyperkalemia (tall peaked T waves, wide QRS), detecting left ventricular hypertrophy (tall R waves), and noting common dysrhythmias. Mastery supports the nursing diagnosis Decreased Cardiac Output (related to dysrhythmia) and prioritization of interventions such as 12-lead ECG, continuous cardiac monitoring, and medication administration (e.g., calcium gluconate for hyperkalemia).

Concept

Cardiac Biomarkers and Their Clinical Use

Importance

High-yield NLE content. Questions frequently ask about the timeline of troponin elevation and why serial measurements are drawn (to detect the rise and fall pattern diagnostic of MI). Nurses must recognize that a single negative troponin does not exclude MI—serial draws are essential. BNP is increasingly used in Philippine healthcare settings for heart failure diagnosis and risk stratification, making this a relevant clinical knowledge point. Understanding biomarkers informs the nursing diagnosis Acute Pain (related to myocardial ischemia/infarction) and interventions such as monitoring serial troponin levels, obtaining 12-lead ECGs, and reporting acute chest pain to the physician.

Concept

Hemodynamic Monitoring Parameters and Nursing Management

Importance

Hemodynamic monitoring is essential in critical care units throughout Philippine hospitals. NLE questions test understanding of normal ranges, interpretation of elevated or low values, and nursing interventions. For example, a patient with low CVP and low MAP requires fluid resuscitation (addressing Deficient Fluid Volume), while a patient with high PAWP requires diuretics and may need inotropic support (addressing Fluid Volume Excess and Decreased Cardiac Output). Mastery of this content supports safe practice in ICU/CCU settings and informs priority nursing diagnoses and interventions.

Concept

Cardiac Catheterization: Procedure, Pre- and Post-Care, and Complications

Importance

Cardiac catheterization is a commonly performed diagnostic procedure in Philippine cardiac centers. NLE questions test pre-procedure safety (allergy assessment, NPO status, consent), post-procedure priority monitoring (site assessment, pulse checks, bleeding detection), and complication recognition. High-yield points include the priority action of assessing for bleeding and arterial insufficiency post-procedure and the critical pre-procedure assessment of iodine/shellfish allergy and renal function. This content directly supports the nursing diagnosis Risk for Bleeding (related to invasive procedure) and Risk for Ineffective Peripheral Tissue Perfusion (related to arterial access), with priority interventions of frequent site and distal limb assessment, pressure application, and mobilization restrictions.

Concept

Cardiovascular Health History and Systematic Physical Assessment

Importance

Systematic cardiovascular assessment is a foundational NLE skill. Students must be able to perform all components (inspection, palpation, auscultation) and recognize abnormal findings. High-yield assessment items include recognizing JVD as a sign of right heart failure, identifying peripheral pulses and assessing their quality (important for detecting arterial insufficiency post-catheterization), and understanding that an S3 in an adult indicates heart failure. This assessment knowledge directly supports the nursing process by informing accurate problem identification and priority setting.

Concept

Integration of Assessment and Diagnostics into the Nursing Process

Importance

This concept bridges assessment knowledge with clinical application and the nursing process. NLE questions increasingly test the ability to interpret assessment findings, formulate appropriate nursing diagnoses, and prioritize interventions. Understanding the relationship between physical findings (e.g., JVD, S3, pulmonary crackles) and nursing diagnoses (Fluid Volume Excess, Decreased Cardiac Output) is essential for safe, effective practice. This knowledge also supports communication with the healthcare team and ensures that nursing care is aligned with the patient's physiologic needs and the broader goals of cardiovascular health promotion and disease prevention in the Philippine healthcare context.

Relationship

Cardiac Output Determinants and Hemodynamic Monitoring

Clinical Example

A post-MI patient on the cardiac unit has a CVP of 15 mmHg (elevated, suggesting volume overload), PAWP of 20 mmHg (elevated, confirming left ventricular dysfunction), cardiac output of 3.2 L/min (low, below normal 4–8), and MAP of 70 mmHg (borderline low). Assessment reveals crackles in the lungs, S3 gallop, JVD, and peripheral edema. The nurse recognizes Decreased Cardiac Output (related to reduced contractility from MI) and Fluid Volume Excess (related to pump failure). Priority interventions include diuretics (to reduce preload/PAWP), oxygen therapy, continuous monitoring, and likely inotropic support (dobutamine) to improve contractility and CO. The nursing diagnosis and interventions directly derive from the hemodynamic picture.

Relationship

ECG Findings and Myocardial Injury

Clinical Example

A 58-year-old Filipino man presents to the ED with chest pain radiating to the left arm and dyspnea. The 12-lead ECG shows ST elevation in leads II, III, aVF (inferior wall) and reciprocal ST depression in V1–V3. Troponin I is elevated at 2.5 ng/mL (normal <0.04). This clinical picture indicates acute inferior wall MI (STEMI). The nurse immediately notifies the physician, places the patient on continuous cardiac monitoring, administers oxygen and aspirin per protocol, obtains IV access, and prepares for emergency cardiac catheterization. The ECG changes and biomarker elevation confirm what the clinical presentation suggested, and the nursing response prioritizes urgent reperfusion to minimize myocardial damage and reduce mortality.

Relationship

Physical Assessment Findings and Heart Failure Diagnosis

Clinical Example

An elderly Filipino woman with hypertension presents with progressive dyspnea, awakening at night gasping for breath (PND), and swelling of her legs. Physical exam reveals JVD, fine crackles at the lung bases bilaterally, S3 gallop, and 2+ pitting edema in the ankles. BNP is 450 pg/mL (elevated). Chest X-ray shows pulmonary edema. Echocardiogram shows ejection fraction of 35% (reduced, normal >50%). These findings confirm Congestive Heart Failure (CHF) with systolic dysfunction. The nursing diagnoses are Fluid Volume Excess and Decreased Cardiac Output. Priority interventions include IV diuretics (furosemide), fluid restriction to 1–1.5 L/day, sodium restriction to <2 g/day, oxygen therapy to maintain SpO2 >94%, ACE inhibitor (lisinopril), beta-blocker (metoprolol), daily weights (target weight loss of 1–2 lbs/day), strict intake/output monitoring, and education on medication adherence and sodium avoidance. As the patient diuresces (JVD decreases, crackles clear, weight drops), the nursing interventions show effectiveness.

Relationship

Cardiac Biomarkers, ECG, and Clinical Presentation in ACS

Clinical Example

A 65-year-old Filipino man with a history of hypertension and smoking calls 911 with chest pain. Initial 12-lead ECG shows ST elevation in V1–V4 (anterior wall STEMI). Troponin is elevated at 3.2 ng/mL. The emergency team activates the cardiac catheterization lab, and the patient is rushed for primary PCI. En route, the nurse administers aspirin 325 mg, ticagrelor 180 mg (loading dose), and IV nitroglycerin, and maintains continuous cardiac monitoring. The nursing priority is to recognize the STEMI pattern, expedite reperfusion (door-to-balloon time), and prevent complications such as cardiogenic shock and dysrhythmias. Post-PCI (stent placement), the patient is transferred to the cardiac care unit for continued monitoring, medication titration (ACE inhibitor, beta-blocker, statin), and patient education on secondary prevention.

Relationship

Contrast Exposure and Contrast-Induced Nephropathy Risk

Clinical Example

A 72-year-old Filipino woman with diabetes and baseline creatinine of 1.8 mg/dL (GFR ~40, stage 3b CKD) undergoes elective cardiac catheterization for stable CAD evaluation. The nurse notes her high CIN risk and implements mitigation: (1) IV normal saline is given 500 mL/hr starting 12 hours before the procedure; (2) Metformin and NSAIDs are held perioperatively; (3) Low-osmolarity contrast is used; (4) Post-procedure, the patient is encouraged to drink 2–3 L of fluid daily; (5) Urine output and creatinine are monitored closely. The patient's creatinine remains stable (1.9 mg/dL at 48 hours, minimal change), indicating successful CIN prevention. Without these interventions, her baseline renal insufficiency would have placed her at high risk for post-procedure acute kidney injury.

Relationship

Systolic vs. Diastolic Heart Failure and Diagnostic Findings

Clinical Example

Two Filipino patients present with dyspnea and orthopnea. Patient A, age 55 with prior MI, has echocardiogram showing EF of 25%, dilated left ventricle. Patient B, age 78 with hypertension, has echocardiogram showing normal EF of 58%, but diastolic dysfunction. Both have elevated BNP, JVD, and crackles. Patient A is treated with IV furosemide, then dobutamine (inotropic support for his low EF), lisinopril, and carvedilol. Patient B is treated with IV furosemide, IV nitroglycerin for afterload reduction, and amlodipine and lisinopril for hypertension control. The nursing care differs: Patient A requires inotropic support to improve contractility, while Patient B requires careful blood pressure and volume management without worsening renal perfusion. Recognition of the EF guides appropriate intervention selection.

Relationship

Nursing Process Integration: Assessment → Diagnosis → Intervention → Evaluation

Clinical Example

Assessment: 58-year-old man presents with 2 hours of crushing substernal chest pain radiating to the left arm, dyspnea, and diaphoresis. Vitals: BP 145/92, HR 102, RR 22, SpO2 93%. 12-lead ECG: ST elevation anteriorly. Troponin: 1.8 ng/mL (elevated). Diagnosis: Acute Pain (related to myocardial ischemia/infarction as evidenced by chest pain 8/10, diaphoresis, ST elevation). Interventions: (1) Supplemental oxygen to SpO2 >94%; (2) Aspirin 325 mg chewed; (3) IV nitroglycerin titrated for pain relief; (4) IV morphine 4 mg for additional pain control; (5) Ticagrelor 180 mg loading; (6) Continuous cardiac monitoring; (7) 12-lead ECG repeated at 10 min; (8) Rapid stat cardiology consult; (9) Prepare for emergency cardiac catheterization. Evaluation (10 minutes): Pain decreased to 4/10; ST elevation unchanged; patient transferred to catheterization lab for primary PCI. Post-intervention: Stent placed to LAD (left anterior descending artery); patient transferred to CCU for continued monitoring. Evaluation continues: troponin trends, hemodynamic stability, pain relief, tolerance of beta-blocker and ACE inhibitor, patient education on risk factors and medication adherence. This example shows how assessment informs diagnosis, diagnosis guides intervention, and evaluation ensures effectiveness and safety.

Scenario

You are assigned to a 62-year-old Filipino man admitted to your ward with complaints of chest discomfort, shortness of breath, and fatigue. He has hypertension and diabetes. On assessment: BP 152/94, HR 98, RR 20, SpO2 94% on room air. He describes the chest discomfort as pressure-like, substernal, radiating to the left arm, onset 3 hours ago. Physical exam reveals diaphoresis and mild pallor. You immediately obtain a 12-lead ECG, which shows ST elevation in the inferior leads (II, III, aVF) with reciprocal changes. Troponin is ordered stat.

Nursing Actions

1. Notify the physician immediately—this is an acute STEMI (ST-elevation MI). 2. Place the patient on continuous cardiac monitoring. 3. Obtain large-bore IV access. 4. Administer oxygen via nasal cannula to maintain SpO2 >94%. 5. Give aspirin 325 mg (chewed for rapid absorption) and request clopidogrel (Plavix) 600 mg loading dose. 6. Administer IV nitroglycerin (starting 0.5 mcg/kg/min, titrating to pain relief or until systolic BP drops by no more than 10 mmHg). 7. Prepare morphine for IV administration if pain is not relieved. 8. Prepare for urgent cardiac catheterization/PCI—activate the cath lab if available or arrange transfer to a tertiary center with PCI capability. 9. Obtain serial troponins (initial, 3 hours, 6 hours) to confirm myocardial necrosis. 10. Maintain NPO status in anticipation of catheterization. 11. Communicate with the patient and family, explaining the urgency of the situation and what to expect. 12. Document all interventions and patient response meticulously.

Expected Outcomes

With rapid reperfusion (PCI and stent placement), the patient's ST elevation should resolve on repeat ECG, chest pain should subside, troponin should rise then fall (confirming MI but with limited necrosis due to early intervention), and hemodynamic stability should be maintained. Post-PCI, continued monitoring in the CCU, medication titration (beta-blocker, ACE inhibitor, statin, P2Y12 inhibitor), and lifestyle modification education support recovery and prevent recurrent events.

Nursing Priorities

Physiologic needs (airway, breathing, circulation) take precedence. The goal is to restore coronary blood flow within 90 minutes (door-to-balloon time) to minimize myocardial damage. Maslow's hierarchy guides prioritization: first, ensure adequate perfusion and oxygenation; then, manage pain and anxiety; finally, provide education and support. RA 9173 emphasizes timely, evidence-based intervention and coordinated team care—nursing is instrumental in recognizing the emergency, activating the team, and ensuring smooth transition to the catheterization lab.

Scenario

You are caring for a 70-year-old Filipino woman post-cardiac catheterization via femoral approach (diagnostic angiography for evaluation of dyspnea). She completed the procedure 2 hours ago and is on bed rest with the right leg straight. You are performing routine post-procedure checks every 30 minutes as per protocol. On your 2.5-hour check, you notice the patient's right foot is slightly cooler than the left and her pedal pulses are diminished compared to the pre-procedure assessment when you marked them as 3+. She denies pain but reports slight numbness in the foot.

Nursing Actions

1. Immediately assess the right femoral artery insertion site for bleeding or expanding hematoma—lift the dressing carefully and observe. 2. Check the right pedal pulse (dorsalis pedis and posterior tibial) and compare to the left; document amplitude and quality. 3. Assess the right lower extremity for color (pallor vs. normal), temperature (cool vs. warm), and sensation (numbness, tingling). 4. Check capillary refill on the right foot. 5. Notify the physician immediately—diminished pulses and coolness suggest arterial insufficiency, possibly from arterial spasm, thrombosis, or emboli from the catheter. 6. Do NOT massage the area or apply heat; keep the limb straight and immobilized. 7. Maintain NPO status pending possible intervention. 8. Obtain IV access if not already present to allow for rapid medication or imaging if needed. 9. Prepare the patient for possible urgent vascular imaging (ultrasound or CT angiography) to determine the cause. 10. If arterial insufficiency is confirmed, the patient may require emergency vascular intervention (thrombolysis, thrombectomy, or vascular surgery consultation). 11. Continue close monitoring of the limb every 15 minutes until the problem is resolved. 12. Document all findings, times, and interventions.

Expected Outcomes

If arterial insufficiency is detected promptly, intervention (thrombolysis, thrombectomy, or interventional radiology consultation) can restore perfusion and prevent tissue loss. Post-intervention, continued pedal pulse monitoring, limb assessment, and anticoagulation (heparin) support recovery. If delays occur or intervention is unsuccessful, amputation may result, emphasizing the critical importance of early nursing assessment and notification.

Nursing Priorities

Arterial insufficiency is a serious post-catheterization complication that can lead to limb-threatening ischemia and tissue necrosis if not addressed urgently. Priority is early detection (frequent pulse checks, color assessment) and rapid notification. Maslow's hierarchy: physiologic needs (tissue perfusion, preventing necrosis) supersede comfort or mobility. RA 9173 emphasizes vigilant monitoring and timely physician notification to prevent adverse outcomes. The Role of the nurse in early recognition cannot be overstated—this patient could lose limb function if the complication is missed.

Scenario

You receive a 65-year-old Filipino man on your cardiac unit with acute decompensated heart failure. History: prior anterior wall MI 3 years ago, EF 28% (severely reduced). Current presentation: orthopnea (sleeps on 4 pillows), paroxysmal nocturnal dyspnea x 2 nights, dyspnea with minimal activity, weight gain of 8 lbs in 2 weeks. Vital signs: BP 140/90, HR 106, RR 24, SpO2 92% on RA. Physical exam: JVD ~5 cm, fine crackles at the lung bases, S3 gallop, 3+ pitting edema in ankles and sacrum, hepatomegaly. Labs: BNP 680 pg/mL (elevated, normal <100), troponin normal, creatinine 1.2 mg/dL (baseline). You are preparing to insert a PA catheter per physician order to guide fluid and medication management.

Nursing Actions

1. Obtain informed consent for PA catheter placement and explain the procedure to the patient. 2. Position the patient supine or semi-Fowler's initially for femoral insertion (or seated for internal jugular). 3. Prepare the catheter, transducer, monitoring equipment, and sterile field. 4. Assist the physician with aseptic insertion technique. 5. Once positioned, level and zero the transducer at the phlebostatic axis (4th intercostal space, midaxillary line). 6. Obtain waveforms: CVP (normally 2–8 mmHg), PA systolic/diastolic, and pulmonary artery wedge pressure (PAWP, normal 8–12 mmHg). 7. Anticipate elevated CVP and PAWP in this patient with acute CHF—expected findings given his orthopnea, JVD, and crackles. 8. Obtain baseline cardiac output and cardiac index. 9. Use hemodynamic data to guide therapy: high PAWP (>18 mmHg) suggests diuretic need; low CO (<3.5 L/min) may necessitate inotropic support; high CVP (>12 mmHg) with high PAWP suggests right and left ventricular dysfunction. 10. Administer IV diuretics (furosemide IV preferred for faster action, e.g., 40 mg IV bolus, then infusion or repeated doses). 11. Initiate nitroglycerin infusion (if BP tolerates) to reduce preload and afterload. 12. Continue beta-blocker and ACE inhibitor (if not contraindicated), though uptitration may be delayed until acute decompensation improves. 13. Fluid restrict to 1–1.5 L/day; sodium restrict to <2 g/day. 14. Monitor daily weights (goal loss of 1–2 lbs/day); strict intake/output monitoring. 15. Maintain bed rest initially; elevate head of bed 30–45° to ease breathing. 16. Assess lungs frequently for improvement (resolution of crackles) and deterioration (worsening hypoxia). 17. Monitor renal function (creatinine, BUN) as diuretics and reduced cardiac output can affect perfusion. 18. Re-check hemodynamics every 6–12 hours initially, adjusting therapy based on response. 19. Patient education: explain the goals of diuresis, fluid restriction, sodium avoidance, medication adherence, and the importance of reporting increased dyspnea, weight gain, or paroxysmal nocturnal dyspnea.

Expected Outcomes

With appropriate diuresis and afterload reduction, the patient should show clinical improvement within 24–48 hours: orthopnea resolves, JVD decreases, crackles clear from the lung bases, S3 may persist but patient function improves, edema diminishes, weight decreases by 1–2 lbs/day, SpO2 improves, and dyspnea with activity decreases. Hemodynamic parameters should normalize: PAWP decreases to 12–15 mmHg, CVP normalizes, and cardiac output improves (though may not reach normal due to the underlying cardiomyopathy, but patient tolerates activity better). Serial BNP may decrease, though often more slowly than clinical improvement. The patient is transitioned from IV to oral diuretics, uptitrated on ACE inhibitors and beta-blockers for chronic heart failure management, and discharged with education on self-care, follow-up appointments, and signs/symptoms requiring urgent evaluation.

Nursing Priorities

This patient has Fluid Volume Excess (NANDA-I diagnosis) related to decreased cardiac pump function, as evidenced by orthopnea, PND, weight gain, JVD, crackles, S3, edema, elevated BNP, and elevated hemodynamic pressures. Secondary diagnosis is Decreased Cardiac Output related to reduced ejection fraction. Using Maslow's hierarchy, physiologic needs (airway, breathing, circulation) are priority—diuresis and afterload reduction are critical to improve pulmonary compliance and oxygenation. PA catheter data provides objective measures of preload (PAWP) and cardiac performance, guiding fluid and medication therapy more precisely than clinical assessment alone. RA 9173 emphasizes evidence-based practice; hemodynamic monitoring is a standard-of-care intervention in this population. The nurse's role is to obtain accurate data, communicate findings to the physician, implement interventions, and evaluate response through reassessment of clinical and hemodynamic findings.

Scenario

A 60-year-old Filipino woman with diabetes, hypertension, and dyslipidemia is scheduled for elective cardiac catheterization to evaluate stable angina. On pre-procedure assessment, she casually mentions she had an 'allergic reaction to shrimp once' and developed hives. She also has baseline serum creatinine of 2.1 mg/dL (GFR ~30, stage 4 CKD) and reports she's been taking her home medications including lisinopril, aspirin, and a statin. You are the pre-procedure nurse responsible for screening and preparation.

Nursing Actions

1. STOP and perform thorough allergy assessment: Ask specifically about shrimp allergy (shellfish allergy is a risk factor for contrast reaction due to iodine cross-reactivity). Ask about prior contrast reactions. Ask about iodine or iodide allergy. Ask if she has family history of contrast reaction. Document all responses. 2. Assess renal function: Creatinine 2.1 mg/dL and GFR ~30 indicate stage 4 CKD—she is at HIGH RISK for contrast-induced nephropathy (CIN). This must be communicated to the physician before the procedure. 3. Discuss CIN risk mitigation with the patient and physician: (a) Hold lisinopril (ACE inhibitor) the day before and day of procedure, resume 24–48 hours post-procedure per protocol; (b) Aggressive IV hydration starting 12 hours pre-procedure (500 mL/hr NS) and continuing 4–24 hours post-procedure (100 mL/hr); (c) Use of low-osmolarity or iso-osmolarity contrast; (d) Consider N-acetylcysteine 600 mg PO BID for 2 days pre and 2 days post (evidence mixed but may offer some renal protection); (e) Post-procedure monitoring of creatinine trend. 4. NPO: Keep patient NPO for 6–8 hours pre-procedure as per institutional protocol. 5. Pre-medication: Discuss with physician about premedication to reduce contrast reaction risk given shellfish allergy—may include IV methylprednisolone, diphenhydramine, and H2 blocker given 12 hours and 2 hours pre-procedure. 6. Baseline vitals: Document BP, HR, weight. 7. Mark distal pulses (pedal pulses bilaterally if femoral approach planned) and document their quality for post-procedure comparison. 8. IV access: Establish large-bore IV (18–20 gauge) for contrast and medications. 9. Patient education: Explain the procedure (catheter placed through femoral or radial artery, contrast dye used to visualize heart vessels, patient will feel warm flush, may hear monitor beeping), expectations post-procedure (bed rest, frequent checks, fluid intake), and signs to report (chest pain, arm/leg numbness, bleeding from insertion site). 10. Confirm informed consent and verify all pre-procedure checklist items. 11. Communicate allergy history and CIN risk prominently on the chart and to the catheterization team (verbally hand-off).

Expected Outcomes

With appropriate pre-medication, the patient tolerates contrast without anaphylaxis. With aggressive hydration and careful fluid management, her creatinine remains stable (increase <25% from baseline) and CIN is prevented. Post-procedure, she recovers uneventfully, with no bleeding, good distal perfusion, stable renal function, and improved functional capacity if significant CAD was found and treated with stent placement.

Nursing Priorities

Two critical issues here: (1) Iodine/shellfish allergy risk for anaphylaxis—must be identified pre-procedure and mitigated with premedication; a contrast reaction in a patient with unrecognized allergy is a preventable complication. (2) Contrast-induced nephropathy risk given stage 4 CKD—aggressive hydration, medication adjustments, and contrast minimization are essential to prevent acute kidney injury. RA 9173 emphasizes safe practice and prevention of iatrogenic harm; nursing's role in pre-procedure screening is fundamental. Maslow's hierarchy: safety needs (preventing allergic reaction and kidney injury) supersede procedural convenience. The nurse is the last line of defense against preventable complications.

Scenario

A 58-year-old Filipino man on your ward has chronic kidney disease (creatinine 3.2 mg/dL) and takes an ACE inhibitor at home (which can reduce potassium excretion). He was admitted 2 days ago with shortness of breath and is now on IV furosemide (a loop diuretic). Today, he complains of muscle weakness and palpitations. You obtain a stat 12-lead ECG per his symptoms. The ECG shows tall, peaked T waves in the precordial leads, widened QRS complex (0.13 sec, previously 0.08 sec), and prolonged PR interval (0.24 sec, previously 0.18 sec).

Nursing Actions

1. Recognize the ECG pattern as classic for hyperkalemia: tall peaked T waves ('tented' appearance), widened QRS, prolonged PR interval. 2. Order STAT serum potassium and electrolyte panel—expect K+ >5.5 mEq/L (normal 3.5–5.0). 3. Notify the physician immediately—hyperkalemia is life-threatening and can precipitate ventricular fibrillation. Do NOT delay; this is a medical emergency. 4. Place the patient on continuous cardiac monitoring. 5. Obtain large-bore IV access if not present. 6. Prepare for emergency treatment to lower potassium: (a) IV calcium gluconate 10% (10–20 mL over 5–10 min) to stabilize the cardiac membrane and prevent arrhythmias (this is the immediate life-saving intervention); (b) IV insulin 10 units with dextrose 25 mL of 50% dextrose to shift potassium intracellularly; (c) Sodium bicarbonate 50–100 mEq IV (additional potassium shift); (d) Loop diuretic (furosemide IV) to promote potassium excretion; (e) Kayexalate (sodium polystyrene sulfonate) PO or PR to bind potassium in the GI tract; (f) Cation exchange resin (Patiromer) if available. 7. Discontinue or adjust potassium-sparing drugs (ACE inhibitors, ARBs, potassium supplements) per physician order. 8. Review renal function and adjust dosing of renally cleared drugs. 9. Monitor ECG for resolution of peaked T waves and narrowing of QRS as potassium decreases. 10. Repeat potassium level in 30–60 minutes to assess response. 11. Patient education on dietary potassium restriction (avoiding bananas, oranges, potatoes, tomatoes, dried fruits, salt substitutes) and medication compliance.

Expected Outcomes

With prompt calcium administration, the patient's peaked T waves and QRS widening should decrease within minutes, reducing arrhythmia risk. Potassium level should decline from >6.0 mEq/L toward normal (3.5–5.0) within 1–2 hours as insulin/glucose and alkalinizing agents work. The patient's muscle weakness and palpitations resolve as potassium normalizes. Long-term management focuses on dietary restriction, medication adjustment, and monitoring of renal function and potassium levels to prevent recurrence.

Nursing Priorities

Hyperkalemia with ECG changes indicating cardiac toxicity (peaked T waves, wide QRS, prolonged PR) is a life-threatening emergency. Physiologic needs (preventing cardiac arrest) take absolute priority. The goal is immediate potassium reduction using calcium (to stabilize membrane), insulin/glucose (to shift K+ intracellularly), and eventually dialysis if renal failure is severe. RA 9173 emphasizes emergency recognition and rapid intervention; delays risk sudden cardiac death. The nurse's role is to recognize the clinical-ECG correlation, alert the team, and execute emergency protocols.