14.2 Submersion Injury
Key Takeaways
- Submersion (drowning) injury is a hypoxic–ischemic event; the primary organ at risk is the brain, with secondary acute lung injury and multi-organ effects.
- Pediatric drowning is often silent and rapid; scene history (water temperature, duration, CPR quality) guides prognosis discussions more than a single ED vital sign.
- Initial ICU priorities are oxygenation/ventilation, hemodynamic support, temperature management with controlled rewarming when hypothermic, and prevention of secondary brain injury.
- Aspiration can cause noncardiogenic pulmonary edema and ARDS-spectrum illness — lung-protective strategies and careful fluid balance matter.
- Neuroprotective nursing includes normoxia (avoid hypoxia and hyperoxia extremes), normocapnia targets per protocol, glucose control, seizure vigilance, and head-of-bed/positioning strategies ordered for ICP risk.
Pathophysiology of Pediatric Submersion
Contemporary terminology prefers drowning (the process of respiratory impairment from submersion/immersion in liquid) and avoids outdated labels that imply a binary "near" outcome. Clinically, nurses still encounter "submersion injury" language in practice and exam stems. The core pathophysiology is hypoxemia from laryngospasm and/or aspiration of water, followed by hypoxic–ischemic injury to brain, heart, and other organs. Freshwater versus saltwater differences are less important than the shared cascade of hypoxia, acidosis, and pulmonary inflammation.
After rescue, children may appear relatively stable, then deteriorate as noncardiogenic pulmonary edema and surfactant dysfunction evolve. Aspiration of even small volumes can trigger intense inflammatory lung injury resembling ARDS. Concurrently, global hypoxia may cause myocardial stunning, arrhythmias, acute kidney injury, hepatic dysfunction, and coagulopathy. Cerebral hypoxia produces cytotoxic edema; intracranial hypertension may follow severe insults.
Age and setting matter. Toddlers drown in bathtubs and backyard pools; adolescents more often in open water with trauma or intoxication co-factors. Cold-water submersion can produce profound hypothermia that both complicates resuscitation and occasionally contributes to neuroprotection in rare, carefully selected scenarios — but hypothermia is not a guarantee of good outcome, and nursing care must still prevent secondary injury.
Immediate Resuscitation Priorities
Field and ED priorities follow pediatric advanced life support: effective ventilation and oxygenation first, high-quality CPR if pulseless, and rapid transport. Remove wet clothing, dry the child, and begin rewarming strategies appropriate to temperature. Cervical-spine precautions apply when dive trauma or unknown mechanism suggests injury, but do not delay ventilation.
In the PICU, anticipate:
- Progressive hypoxemia and need for escalating oxygen, noninvasive support, or intubation
- Hemodynamic instability from hypoxia-related myocardial dysfunction or fluid shifts
- Electrolyte and acid–base disturbances after prolonged arrest or cold exposure
- Seizures, encephalopathy, and evolving cerebral edema
Obtain history: estimated submersion time, water temperature, witnessed versus unwitnessed, bystander CPR quality, aspiration of gastric contents, and any trauma. These details inform prognosis conversations even when early labs look mixed.
Pulmonary Care After Aspiration
Chest imaging may be initially clear and later show diffuse infiltrates. Nursing assessment tracks work of breathing, SpO₂, secretion character, and ventilator mechanics. Lung-protective ventilation principles — appropriate PEEP, limited plateau pressures, careful recruitment — reduce secondary lung injury. Avoid routine aggressive hyperventilation solely for "neuroprotection"; CO₂ targets are individualized, but extreme hypocapnia can worsen cerebral ischemia.
Monitor for acute respiratory distress patterns, pneumothorax risk on high pressures, and ventilator-associated events. Pulmonary toilet is important, but hypoxic children desaturate quickly with disconnection — preoxygenate and use closed systems when possible. Fluid overload worsens pulmonary edema; titrate fluids to perfusion while avoiding unnecessary volume once shock is corrected.
| Phase | Common findings | Nursing emphasis |
|---|---|---|
| Immediate (minutes–hours) | Hypoxemia, acidosis, possible arrest | Airway, CPR quality, temperature, glucose |
| Early ICU (hours–24 h) | Worsening pulmonary edema, myocardial stunning | Gas exchange, hemodynamics, labs, seizure watch |
| Evolving (24–72 h) | ARDS pattern, cerebral edema risk, infection | Lung protection, neuro checks, family updates |
| Recovery / rehab | Weakness, aspiration risk, PTSD in family | Liberation trials, developmental support |
Rewarming and Temperature Management
Hypothermic submersion victims need controlled rewarming unless a therapeutic hypothermia protocol is explicitly ordered for hypoxic–ischemic encephalopathy (practice varies and is protocol-driven). Passive external rewarming (warm environment, dry blankets) suits mild hypothermia; active external and core methods (warmed IV fluids, forced-air, esophageal/bladder warming devices as available) are used for deeper hypothermia per institutional guidelines. Rewarm gradually while watching for arrhythmias, vasodilation-related hypotension, and afterdrop. Continuous core temperature monitoring is essential.
Fever after rewarming increases cerebral metabolic demand — treat fever aggressively in brain-at-risk children. Shivering increases oxygen consumption; treat per protocol.
Neuroprotective Nursing
The brain is the organ that determines long-term outcome. Secondary injury prevention is the nurse's daily craft:
- Oxygenation: Correct hypoxia promptly; avoid prolonged extreme hyperoxia when saturations are reliably adequate.
- Ventilation: Maintain ordered PaCO₂ range; sudden swings in CO₂ alter cerebral blood flow.
- Circulation: Support blood pressure to maintain cerebral perfusion; treat arrhythmias and myocardial dysfunction.
- Glucose: Prevent hypoglycemia (common in infants) and marked hyperglycemia.
- Seizures: Continuous observation; EEG when ordered; administer antiseizure medications promptly.
- Positioning and ICP: Head midline, head-of-bed elevation as ordered, avoid jugular compression from tight ties, space care to limit ICP spikes.
- Environment: Reduce noxious stimulation during unstable intracranial periods; cluster care thoughtfully.
Serial neurologic exams — pupil reactivity, motor response, GCS/pediatric coma scoring — are documented carefully. Pupillary changes, Cushing signs, or sudden hypertension with bradycardia demand immediate escalation.
Hemodynamic and metabolic support continues in parallel with neuroprotection. Hypoxia-related myocardial dysfunction may require inotropes after adequate oxygenation is restored; nurses trend lactate, central venous saturation when available, and urine output as perfusion markers. Acute kidney injury from hypoperfusion after prolonged arrest warrants careful fluid and electrolyte management. Coagulopathy and stress hyperglycemia appear frequently after arrest — follow ordered correction pathways without chasing every lab at the expense of brain-focused stability. When families ask for prognosis numbers, explain that submersion duration, CPR quality, presenting pH and lactate, and early neurologic exam inform risk, but individual trajectories vary — avoid false precision.
Prognosis remains uncertain early. Some children awaken quickly; others evolve severe disability or brain death pathways. Nursing communication stays honest, frequent, and family-centered without premature certainty. Involve palliative resources early when catastrophic injury is evident, while still delivering full supportive ICU care until goals are clarified.
Prevention counseling (pool fencing, supervision, swim skills, bathtub vigilance) is part of discharge teaching for survivors and is fair game for professional caring items on the exam.
A toddler rescued from a backyard pool is intubated for hypoxemia. Two hours later the chest radiograph, initially near-normal, shows diffuse bilateral infiltrates and FiO₂ requirements are rising. What pathophysiology best explains this course?
A school-age child is profoundly hypothermic after cold-water submersion and has return of spontaneous circulation. Which rewarming approach best matches safe ICU nursing practice?
Which nursing intervention set best reflects secondary brain injury prevention after pediatric drowning?