USMLE Prep - Medical Reference Library

Nonfatal Drowning - Airway and Ventilation Algorithm

System: Wilderness Medicine • Reviewed: Aug 31, 2025 • Step 1Step 2Step 3

Synopsis:

Prioritize airway and ventilation with spinal precautions when indicated; give oxygen, consider CPAP or intubation for hypoxia, and observe for delayed pulmonary edema.

Key Points

  • Stabilize ABCs; begin targeted evaluation without delaying life-saving therapy.
  • Use system-specific risk tools to guide testing and disposition.
  • Order high-yield tests first; escalate imaging when indicated.
  • Start evidence-based initial therapy and reassess frequently.

Algorithm

  1. Primary survey and vitals; IV access and monitors.
  2. Focused history/physical; identify red flags and likely etiologies.
  3. Order system-appropriate labs and imaging (see Investigations).
  4. Initiate guideline-based empiric therapy (see Pharmacology).
  5. Reassess response; arrange consultation and definitive management.

Clinical Synopsis & Reasoning

For Nonfatal Drowning Airway Ventilation Algorithm, frame the differential by acuity and pathophysiology, then align diagnostics to the leading hypotheses. Prioritize stabilization while obtaining high‑yield studies such as CBC (Baseline hematology), BMP (Electrolytes/renal). Incorporate bedside imaging and targeted labs to define severity and identify complications; synthesize results with clinical trajectory to refine the working diagnosis and disposition needs.


Treatment Strategy & Disposition

Initiate disease‑directed therapy alongside supportive care, titrating to objective response. Pharmacologic options commonly include Analgesia/Antipyretics. Use validated frameworks (e.g., Disposition Clues) to guide escalation and site of care. Address precipitating factors, de‑escalate empiric therapies with data, and arrange follow‑up for monitoring and risk‑factor modification; admit patients with instability, high risk of deterioration, or needs for close monitoring.


Epidemiology / Risk Factors

  • Risk factors vary by condition and patient profile

Investigations

TestRole / RationaleTypical FindingsNotes
CBCBaseline hematologyAbnormal counts
BMPElectrolytes/renalDerangements

Disposition Clues

FeaturePlan
Normal exam and oxygenation after observationDischarge with precautions
Persistent hypoxia or symptomsAdmit and monitor
Comorbidities or aspiration concernLower threshold to admit

Pharmacology

MedicationMechanismOnsetRole in TherapyLimitations
Albuterol (neb)β2-agonistMinutesBronchospasm/wheezingTachycardia
Antibiotics (not routine)N/AN/AReserve for infection signs

Prognosis / Complications

  • Prognosis depends on severity, comorbidities, and timeliness of care

Patient Education / Counseling

  • Explain red flags and when to seek emergent care.
  • Reinforce medication adherence and follow-up plan.

Notes

Fresh versus salt water distinction is less important than hypoxia management. Consider co exposures such as toxins or trauma.


References

  1. AHA resuscitation science on drowning — Link
  2. Wilderness Medical Society water rescue statements — Link