What is the acute management and post‑resuscitation care for a patient who has experienced a near‑drowning event?

Acute Management and Post-Resuscitation Care for Near-Drowning

Immediately prioritize airway management and rescue breathing over chest compressions in near-drowning victims, as cardiac arrest results from severe hypoxemia rather than primary cardiac pathology. 1

Immediate Resuscitation Sequence

In-Water Phase (If Safe and Trained)

• Begin rescue breathing while still in water if you are appropriately trained and it is safe to do so—this may prevent progression to cardiac arrest 1
• Do NOT attempt chest compressions in water; they are ineffective and dangerous
• Remove victim from water in near-horizontal position with head elevated above body level and airway open 1

On-Land Resuscitation

For trained rescuers, you may initiate CPR with either:

• Airway → Breathing → Chest compressions (A-B-C sequence), OR
• Chest compressions → Airway → Breathing (C-A-B sequence) 1

The 2024 AHA/AAP guidelines explicitly allow flexibility here, but the critical point is that rescue breaths MUST be included as part of CPR for drowning victims—this is non-negotiable 1.

Specific Resuscitation Steps:

• Administer 100% oxygen immediately when available—hypoxemia is the primary pathophysiology 1
• Dry the chest and apply AED, though shockable rhythms are a minority in drowning arrests 1
• No preferred ventilation mode exists (mouth-to-mouth, bag-valve-mask, advanced airway)—use what is available 1
• Do NOT attempt Heimlich maneuver or abdominal thrusts to clear water—this wastes time and is ineffective

Critical Pitfall to Avoid

Do NOT waste time attempting to drain water from the lungs. The amount of water aspirated is typically small (1-3 mL/kg), and attempts to remove it delay critical oxygenation 2. The pathophysiology involves surfactant washout and noncardiogenic pulmonary edema, not simply "water-filled lungs" 3, 4.

Hospital-Based Management

Emergency Department Assessment

All patients requiring ANY level of resuscitation (even just rescue breaths) must be transported to the ED 1. The key distinction is between respiratory arrest and cardiac arrest, though this is often difficult to determine in the field 1.

Immediate ED Interventions:

• Establish adequate oxygenation and ventilation as first priority 3
• Assess neurological status using Glasgow Coma Score (GCS) immediately upon arrival
• Obtain chest radiograph (expect noncardiogenic pulmonary edema pattern)
• Core temperature measurement
• Arterial blood gas analysis

Post-Resuscitation Respiratory Management

The primary pathophysiology is aspiration-induced noncardiogenic pulmonary edema causing intrapulmonary shunting 3, 4. Both saltwater and freshwater cause similar pathology despite different mechanisms 2.

Ventilation Strategy:

• Apply positive end-expiratory pressure (PEEP) or continuous positive airway pressure (CPAP) as the mainstay of treatment 4
• Target: Intrapulmonary shunt ≤20% or PaO₂:FiO₂ ≥250 2
• Avoid premature extubation—this commonly causes return of pulmonary edema requiring re-intubation 2

What NOT to Do:

• Do NOT use prophylactic antibiotics—not warranted and may be detrimental 4
• Do NOT use corticosteroids—controversial at best, potentially harmful 4
• Do NOT use barbiturate coma for cerebral resuscitation—does not improve outcomes and may be detrimental 4, 5
• Do NOT use induced hypothermia (except in true cold-water drowning with hypothermia on presentation)—does not improve neurologic outcomes 4

Neurological Prognostication

The evidence here is nuanced but clinically actionable:

Poor prognostic indicators:

• Unreactive pupils in ED (odds ratio 374 for poor outcome) 5
• GCS ≤5 on ICU arrival (odds ratio 51 for poor outcome) 5
• Flaccid coma (GCS 3) on ICU arrival—no patients survived neurologically intact in one series 6

However, NO predictor is absolute. Two patients without vital signs requiring full CPR and cardiotonic medications achieved complete neurologic recovery 5. This underscores the critical recommendation: Provide full aggressive resuscitation in the ED regardless of initial presentation 5.

Cerebral Resuscitation Controversy:

The evidence strongly suggests that routine aggressive supportive ICU care is sufficient—complex cerebral salvage techniques (ICP monitoring, induced hypothermia, barbiturate coma, osmotic diuretics) do not improve outcomes in warm-water drowning 4, 5, 6. The 56% intact survival rate with supportive care alone challenges the utility of these interventions 5.

Disposition Criteria

Observation requirements:

• Completely asymptomatic patients with normal vital signs, oxygenation, and chest radiograph: 4-6 hours observation minimum 3
• Any patient requiring resuscitation: Minimum 24 hours observation 3
• ICU admission for: respiratory insufficiency, altered mental status, hemodynamic instability, or significant comorbidities 2

Special Consideration: ECMO

Consider ECMO for severe ARDS after resuscitation in cases with short drowning time or hypothermia, as these predict better neurological outcomes 7. This represents an advanced salvage option when conventional ventilation fails.

Key Clinical Pearls

1. Drowning is fundamentally a respiratory emergency, not a cardiac one—manage it accordingly
2. The hypoxemia causes the cardiac arrest, so oxygenation is paramount
3. Neurologic outcomes can be excellent even after prolonged CPR in select cases—don't give up prematurely
4. Supportive care is the cornerstone—avoid unproven "aggressive" cerebral interventions
5. Prevention is 90% effective—counsel all patients/families on water safety 1

The 2024 AHA/AAP guidelines 1 represent the most current evidence-based approach and supersede all prior recommendations, emphasizing the unique respiratory-focused resuscitation strategy that distinguishes drowning from other cardiac arrest etiologies.