NLE Emergency & Critical Care Nursing — Trauma, Poisoning & Environmental EmergenciesDetailed Explanation

Multiple Trauma (Polytrauma): Primary Survey and ABCDE Priorities

Multiple trauma, or polytrauma, refers to injury involving more than one body system or region at the same time. The danger is that a dramatic-looking but survivable injury (like a lacerated scalp) can distract the team from a quiet, lethal one (like a splenic rupture causing internal hemorrhage). The primary survey — ABCDE — is a structured, rapid assessment framework designed to find and treat immediate life threats in order of priority. **A — Airway with Cervical Spine Control:** In any significant blunt-force trauma, assume a cervical spine injury until proven otherwise. Open the airway using the JAW-THRUST maneuver (not head-tilt-chin-lift, which hyperextends the neck). Manual cervical spine immobilization or a properly fitted cervical collar is applied simultaneously. **B — Breathing:** After securing the airway, assess for adequate ventilation. Three immediately life-threatening chest injuries must be identified and treated on the spot: (1) Tension pneumothorax — treated with needle decompression at the 2nd intercostal space, midclavicular line; (2) Open (sucking) pneumothorax — covered with a three-sided occlusive dressing; (3) Massive hemothorax — requires chest tube insertion. **C — Circulation with Hemorrhage Control:** Hemorrhage is the leading cause of preventable trauma death. Actions: apply direct pressure to external wounds, apply a tourniquet for uncontrolled extremity bleeding, establish two large-bore IV lines (16-gauge or larger), and begin balanced resuscitation with blood products for major hemorrhage. Occult bleeding sites — chest, abdomen, pelvis, and thighs (each femur fracture can lose 1–2 liters) — must be suspected. **D — Disability (Neurological Assessment):** Assess the Glasgow Coma Scale (GCS: Eyes 1–4, Verbal 1–5, Motor 1–6, total 3–15) and pupillary response. A GCS below 8 generally indicates the need for definitive airway management. A deteriorating GCS after initial assessment is an urgent sign of rising intracranial pressure. **E — Exposure and Environment:** Fully undress the patient (cut clothing if needed) to find all hidden injuries, then aggressively prevent hypothermia with warm blankets and warmed IV fluids. **The Trauma Lethal Triad:** Hypothermia, acidosis, and coagulopathy form a deadly self-reinforcing cycle — hypothermia impairs clotting enzymes → coagulopathy worsens bleeding → hemorrhage deepens acidosis → acidosis worsens hypothermia. Keeping the trauma patient warm is a true resuscitation priority. The secondary survey (head-to-toe physical exam, history, diagnostics) follows only after the primary survey is complete and life threats are addressed. The nurse's role throughout is continuous reassessment — a trauma patient who is 'stable' can decompensate suddenly from occult internal bleeding.

Emergency Burn Care: Assessment and Fluid Resuscitation

Burns are one of the most complex emergency conditions because they simultaneously threaten the airway, cause massive fluid shifts, destroy the skin barrier against infection, and cause profound pain. Burn management follows a clear priority sequence. **Step 1 — Stop the Burning Process:** Remove all clothing, jewelry (rings, bracelets — these constrict as edema forms), and watches. Do NOT peel away adherent material (clothing stuck to burned skin) as this causes further tissue damage. **Step 2 — Airway Assessment (HIGHEST PRIORITY in burns):** Inhalation injury is the number-one early cause of death in burn victims. Warning signs include: facial burns, singed nasal hair, soot in the mouth or oropharynx, hoarseness, stridor, carbonaceous sputum, and a history of being in an enclosed fire. Airway edema develops RAPIDLY (within hours). Early intubation is far safer than waiting — once the airway closes from edema, emergency surgical airway (cricothyroidotomy) becomes necessary. **Step 3 — Assess Burn Depth:** - Superficial (1st degree): epidermis only; red, painful, no blisters (e.g., sunburn) - Partial-thickness (2nd degree): epidermis + part of dermis; blistered, wet, very painful - Full-thickness (3rd degree): all layers; dry, leathery, painless (nerve destruction), may be white, brown, or black **Step 4 — Estimate %TBSA Using the Rule of Nines (Adults):** - Head and neck = 9% - Each upper extremity = 9% - Anterior trunk = 18% - Posterior trunk = 18% - Each lower extremity = 18% - Perineum = 1% - Total = 100% For irregular or scattered burns, the patient's palm (including fingers) = approximately 1% TBSA. **Step 5 — Parkland Formula for Fluid Resuscitation:** Total fluid in 24 hours = 4 mL × body weight (kg) × %TBSA burned Fluid used: Lactated Ringer's solution Schedule: - HALF of total in FIRST 8 HOURS (from time of injury, NOT time of arrival) - Remaining HALF over the next 16 HOURS Example: 70 kg patient with 40% TBSA burn: Total = 4 × 70 × 40 = 11,200 mL First 8 hours: 5,600 mL (≈700 mL/hr) Next 16 hours: 5,600 mL (≈350 mL/hr) Monitor fluid adequacy with URINE OUTPUT: target 0.5 mL/kg/hr in adults (30–50 mL/hr for a 70 kg adult). Inadequate urine output = increase the infusion rate. **Carbon Monoxide (CO) Poisoning:** Always suspect in enclosed-space fires. CO binds hemoglobin with 250× greater affinity than oxygen, causing tissue hypoxia despite a normal SpO2 reading. Pulse oximetry CANNOT distinguish carboxyhemoglobin from oxyhemoglobin — it will show a falsely NORMAL reading. Treat with HIGH-FLOW 100% OXYGEN via non-rebreather mask (reduces CO half-life from ~5 hours to ~60–90 minutes). Severe cases may require hyperbaric oxygen therapy. **Wound Care:** Cover burns with clean, dry dressings. Wet dressings cause hypothermia — burned patients lose heat rapidly because the skin barrier is destroyed. Maintain warmth aggressively.

Poisoning and Overdose: Decontamination, Antidotes, and Toxidromes

Poisoning management follows a universal framework: (1) Stabilize the ABCs first, (2) identify the toxin if possible, (3) decontaminate when appropriate, (4) give a specific antidote if one exists, and (5) enhance elimination. Most poisoned patients receive supportive care; antidotes are used only for specific toxins. **Decontamination Principles:** *Activated Charcoal (AC):* Activated charcoal adsorbs (binds) many ingested toxins in the GI tract, preventing absorption. It is most effective when given within ONE HOUR of ingestion. Key points: - Works by physical adsorption — it is NOT a chemical antidote - Dose: 1 g/kg body weight (adult usually 50–100 g) mixed with water - CONTRAINDICATED when: (a) airway is unprotected (decreased consciousness without a secured ETT) due to aspiration risk, (b) ingestion of caustics/corrosives, (c) ingestion of hydrocarbons/solvents - DOES NOT bind: alcohols (ethanol, methanol, ethylene glycol), iron, lithium, cyanide, heavy metals, corrosives *Gastric Lavage:* No longer routinely recommended — evidence shows limited benefit and significant risk. *Induced Emesis (Syrup of Ipecac):* NEVER give ipecac routinely, and NEVER induce vomiting after ingestion of caustics (acid/alkali) or hydrocarbons — re-exposure of the esophagus and aspiration cause far more damage. **Key Toxidromes and Their Antidotes:** 1. **OPIOID TOXIDROME:** Classic triad — miosis (pinpoint pupils), respiratory depression, decreased consciousness. Antidote: **NALOXONE (Narcan)**. Titrate to restore breathing (not full consciousness — avoids acute withdrawal). Note: naloxone's duration is SHORT (30–90 min) while most opioids last longer — may need repeated doses or infusion. 2. **CHOLINERGIC (Organophosphate) TOXIDROME:** Organophosphates (pesticides) inhibit acetylcholinesterase, causing acetylcholine accumulation. Muscarinic effects remembered by SLUDGE: Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis. Also: miosis, bradycardia, bronchospasm, seizures. Antidote: **ATROPINE** (blocks muscarinic receptors — given in large doses until secretions dry) + **PRALIDOXIME (2-PAM)** (reactivates cholinesterase — must be given EARLY before aging of the enzyme-organophosphate bond occurs). 3. **ACETAMINOPHEN (PARACETAMOL) OVERDOSE:** Delayed hepatotoxicity — patient may appear well for 24 hours then develop liver failure by day 3–4. Antidote: **N-ACETYLCYSTEINE (NAC)**. Mechanism: replenishes glutathione to neutralize the toxic NAPQI metabolite. MOST effective within 8–10 hours of ingestion. The Rumack-Matthew nomogram guides treatment decisions. 4. **DIGOXIN TOXICITY:** Signs include nausea, vomiting, visual disturbances (yellow-green halos), bradyarrhythmias, and severe hyperkalemia. Antidote: **DIGOXIN-SPECIFIC ANTIBODY FRAGMENTS (Fab) — Digibind/DigiFab.** Used for life-threatening dysrhythmias or severe hyperkalemia. 5. **BENZODIAZEPINE OVERDOSE:** Sedation, respiratory depression, hypotonia. Antidote: **FLUMAZENIL.** USE WITH EXTREME CAUTION — can precipitate life-threatening seizures in patients with chronic benzodiazepine dependence or in mixed overdoses (with TCAs or cocaine). NOT given routinely. **Additional High-Yield Antidote Pairs:** - Beta-blockers → Glucagon - Heparin → Protamine sulfate - Warfarin → Vitamin K (Phytonadione) - Iron overdose → Deferoxamine - Methanol / Ethylene glycol (antifreeze) → Fomepizole (or ethanol) - Cyanide → Hydroxocobalamin (Cyanokit) or Sodium thiosulfate - Tricyclic antidepressants (TCAs) → Sodium bicarbonate (for cardiac arrhythmias) - Acetylsalicylic acid (aspirin) → Sodium bicarbonate (urine alkalinization to enhance excretion)

Bites and Stings: Snakebite, Insect, and Animal/Human Bites

Bites and stings are common emergency presentations in Philippine communities, given the country's tropical environment with abundant wildlife. Management priorities differ by agent but all share the need for rapid assessment of systemic envenomation and anaphylaxis risk. **Snakebite Management:** The Philippines is home to several venomous snake species including the Philippine cobra (Naja philippinensis). Management is guided by the principle of minimizing venom spread while preparing for antivenom therapy. Correct first aid for snakebite: 1. IMMOBILIZE the affected limb at or BELOW heart level (elevation increases systemic absorption) 2. Keep the patient CALM and STILL — movement increases heart rate and venom lymphatic spread 3. MARK the advancing edge of swelling with a pen and note the time — this tracks progression of envenomation 4. TRANSPORT URGENTLY to a facility with antivenom 5. Administer ANTIVENOM for signs of systemic envenomation (coagulopathy, neurotoxicity, hemolysis, progressive local tissue destruction) What NOT to do (common harmful first-aid myths): - Do NOT apply ICE — causes vasoconstriction and worsens local tissue damage - Do NOT cut the bite and suck out venom — introduces infection and is ineffective - Do NOT apply an ARTERIAL TOURNIQUET — causes limb ischemia - Do NOT apply pressure immobilization bandage for cytotoxic/hemotoxic snakes (only appropriate for neurotoxic snakes like some Australian species, not Philippine cobras) **Insect Stings (Bee/Wasp):** Honeybee stings leave an embedded stinger with attached venom sac. Remove by SCRAPING (use a card or fingernail) — do NOT use tweezers/forceps as squeezing the venom sac injects more venom. Clean the area and apply cold compresses. Watch for ANAPHYLAXIS: urticaria, angioedema, bronchospasm, hypotension. Treatment: - EPINEPHRINE 1:1,000 — 0.3–0.5 mg INTRAMUSCULAR (anterior thigh/vastus lateralis) — this is the FIRST-LINE treatment for anaphylaxis - Secondary: antihistamines (diphenhydramine), corticosteroids, IV fluids, bronchodilators - Keep patient for observation (minimum 4–6 hours) for biphasic anaphylaxis **Animal and Human Bites:** 1. WOUND IRRIGATION: copious irrigation with soap and water, then normal saline — this is the most important step in reducing infection 2. Assess for TENDON and NERVE injury (especially human bites over knuckles — 'fight bites') 3. TETANUS PROPHYLAXIS: update TT vaccine if not immunized within 5 years 4. RABIES POST-EXPOSURE PROPHYLAXIS (PEP): consider for all mammal bites (dog, cat, bat); follow DOH-NMCP protocols — wound washing + rabies immunoglobulin + rabies vaccine series 5. ANTIBIOTICS: high-risk wounds (deep punctures, hands, feet, near joints, human bites, immunocompromised patients) — amoxicillin-clavulanate is commonly used 6. Do NOT routinely close bite wounds primarily — delayed closure or healing by secondary intention reduces infection risk (exception: facial bites may be closed due to cosmesis)

Heat-Related Illness: Heat Exhaustion vs. Heat Stroke

The Philippines, with its tropical climate, places both outdoor workers and athletes at high risk for heat-related illness — especially during the hot season (March–May). The critical distinction between heat exhaustion and heat stroke determines management urgency. **Heat Exhaustion:** Results from excessive fluid and electrolyte loss from sweating during heat exposure. Clinical features: - Heavy sweating - Weakness, malaise - Headache, nausea, vomiting - Muscle cramps - Pale, clammy skin - Normal or MILDLY elevated body temperature (< 40°C) - **INTACT MENTAL STATUS — this is the KEY distinguishing feature** - Mild hypotension, tachycardia Management: 1. Move to a cool environment 2. Remove excess clothing 3. Oral rehydration if conscious (ORS preferred); IV isotonic fluids if unable to tolerate oral 4. Rest in supine position with legs elevated 5. Apply cool wet cloths to skin 6. Monitor vital signs **Heat Stroke — A TRUE MEDICAL EMERGENCY:** Heat stroke occurs when the body's thermoregulatory mechanisms fail completely, causing core temperature > 40°C (104°F) with CENTRAL NERVOUS SYSTEM DYSFUNCTION. Two types: 1. Classic (non-exertional): affects the elderly, chronically ill, those taking diuretics/anticholinergics; hot DRY skin 2. Exertional: affects young healthy athletes or laborers in extreme heat; skin may still be SWEATING Clinical features: - Core temperature > 40°C (rectal or esophageal temperature — axillary is inaccurate) - **ALTERED MENTAL STATUS — confusion, disorientation, seizures, coma (THIS IS THE KEY FEATURE)** - Hot skin (dry in classic; may be moist in exertional) - Hypotension, tachycardia - Potential multi-organ failure: rhabdomyolysis, DIC, acute renal failure, hepatotoxicity **Management — IMMEDIATE AGGRESSIVE COOLING IS THE PRIORITY:** 1. REMOVE clothing immediately 2. COOL by ANY available means — fastest cooling method is cold-water immersion (ice bath): - Cold-water or ice-water immersion (most effective) - Evaporative cooling: mist with cool water + fan (practical in hospital setting) - Apply ice packs to groin, axillae, neck (areas of large blood vessels) - Cooled IV fluids 3. **DO NOT delay cooling for transport or diagnostic workup** — every minute at high temperature causes irreversible organ damage 4. Target core temperature < 39°C (102.2°F) before stopping cooling (to prevent overshoot) 5. **Antipyretics (paracetamol, ibuprofen, aspirin) DO NOT WORK in heat stroke** — the problem is an overwhelming environmental heat load, not an elevated hypothalamic set point. Antipyretics are not indicated. 6. Establish IV access, obtain labs (CBC, BMP, LFTs, CPK, coags, UA) 7. Monitor for seizures, arrhythmias, and organ failure **Memory Aid: Heat Exhaustion vs. Heat Stroke** - Heat Exhaustion: MENTAL STATUS INTACT — treat with cooling and hydration - Heat Stroke: MENTAL STATUS ALTERED — treat with IMMEDIATE AGGRESSIVE COOLING — this is a LIFE-THREATENING EMERGENCY

Hypothermia and Near-Drowning (Submersion Injury)

**HYPOTHERMIA:** Hypothermia is defined as a core temperature BELOW 35°C (95°F). In the Philippines, hypothermia risk is highest among typhoon survivors, calamity victims, the elderly, neonates, and mountaineers (Mt. Apo, Mt. Pulag). Classification by severity: - Mild: 32–35°C — shivering, cold skin, mild confusion, tachycardia - Moderate: 28–32°C — shivering STOPS (no energy reserve), progressive obtundation, arrhythmias possible - Severe: < 28°C — coma, no shivering, severe bradycardia, ventricular fibrillation risk **Key Management Principles:** 1. **HANDLE WITH EXTREME GENTLENESS:** A cold, hypothermic heart is electrically irritable — rough movement (jostling, aggressive repositioning) can trigger ventricular fibrillation. Move patients smoothly. 2. **Remove wet clothing** — wet clothing accelerates heat loss (conduction + evaporation). 3. **Rewarm according to severity:** - Mild hypothermia: PASSIVE EXTERNAL REWARMING — warm blankets, warm environment, warm beverages (if conscious) - Moderate hypothermia: ACTIVE EXTERNAL REWARMING — warming blankets, heating pads (padded to prevent burns), radiant heat lamps. Note: risk of 'afterdrop' (core temp initially drops further as cold peripheral blood returns to core) — monitor closely. - Severe hypothermia: ACTIVE INTERNAL (CORE) REWARMING — warmed humidified oxygen (via ETT), warmed IV fluids (39–42°C), warmed body cavity lavage (peritoneal, thoracic, bladder), and in extremis: ECMO or cardiopulmonary bypass. 4. **Prolong resuscitation — 'NOT DEAD UNTIL WARM AND DEAD':** In cardiac arrest with hypothermia, continue CPR and active internal rewarming before declaring death. Cold temperatures protect the brain and vital organs from hypoxic injury — remarkable neurological recoveries have occurred in patients with prolonged hypothermic arrests. Do not stop resuscitation until the core temperature is at or near normal AND the patient is still not responding. 5. Avoid vasodilating medications, warming alcohol, or warmed fluids beyond 42°C. **NEAR-DROWNING (SUBMERSION INJURY):** Near-drowning (now more precisely termed 'drowning with survival' in newer nomenclature) refers to a submersion event where the victim survives, at least temporarily. The primary life-threatening mechanism is **HYPOXIA** — pulmonary compromise from water aspiration and laryngospasm. Key management principles: 1. **AIRWAY AND VENTILATION ARE THE ABSOLUTE PRIORITIES** — begin rescue breathing as soon as possible, even in the water if feasible. CPR should start immediately on retrieval. 2. There is **NO CLINICALLY MEANINGFUL DIFFERENCE** in immediate management between freshwater and saltwater drowning — both cause hypoxia, and both are managed the same way (airway, oxygen, ventilation). 3. **Remove wet clothing and treat associated hypothermia** — cold-water drowning is often accompanied by hypothermia. 4. **OBSERVE FOR DELAYED PULMONARY COMPLICATIONS ('SECONDARY DROWNING'):** Even a victim who appears to have recovered fully (e.g., coughed out water, seems fine) can develop pulmonary edema, pneumonitis, or ARDS hours later (up to 24 hours). ALL submersion victims must be observed in a healthcare setting for a minimum of 4–8 hours, and any respiratory symptoms warrant hospital admission. 5. Cervical spine injury: consider C-spine precautions for diving accidents or unknown mechanism. 6. Routine administration of antibiotics, corticosteroids, and surfactant are NOT indicated prophylactically in near-drowning.

The Parkland formula calculation is a classic NLE problem. The key concept tested here is that the 8-hour window is from TIME OF INJURY (10:00 AM), not time of arrival (12:00 PM). Since 2 hours have elapsed before the patient arrives and IVF can be started, the 4,200 mL must be delivered in the remaining 6 hours, requiring a higher rate of 700 mL/hr. Target urine output to confirm adequacy: 0.5 mL/kg/hr = 0.5 × 60 = 30 mL/hr minimum.

Organophosphate poisoning from pesticides is the most common poisoning emergency in Philippine agricultural communities. This problem tests toxidrome recognition, antidote knowledge, and the specific endpoint for atropine titration. The GCS of 10 means the airway is at risk — securing the airway is the FIRST action before decontamination or antidote administration. Activated charcoal requires a protected airway (secured ETT) before administration in this obtunded patient.

This is a classic NLE comparison question. The single most important distinguishing feature is MENTAL STATUS — intact = heat exhaustion; altered = heat stroke. The follow-up on Student B tests knowledge that antipyretics are useless in heat stroke (the mechanism is heat overload, not infection-driven fever). Cooling by any aggressive means without delay is the priority.

Acetaminophen/paracetamol overdose is the most common intentional drug overdose in the Philippines due to over-the-counter availability. The deceptive clinical picture (patient feels fine in the first 24 hours) is a key NLE trap. The window for effective NAC therapy is 8–10 hours — do NOT wait for symptoms or abnormal labs to develop before starting treatment.

This problem tests the three key hypothermia management points: severity-based rewarming, gentle handling, and the 'not dead until warm and dead' resuscitation principle. In the Philippine context, typhoon survivors are at real risk for severe hypothermia combined with submersion injury — these principles directly apply to NDRRMC disaster response operations.