Eduovisual
Emergency & Toxicology
Drowning and submersion injury
— Abandon legacy terms: "near-drowning," "wet/dry drowning," "secondary drowning," "delayed drowning" — these are not used in modern reporting and are wrong answers on exams
— "Submersion" = airway under liquid; "immersion" = airway above liquid but body splashed (relevant to cold-water immersion syndrome)
— 2nd leading cause of unintentional injury death in children 1–4 years (after MVC) in the US
— Bimodal age distribution: toddlers (bathtubs, pools) and adolescent/young-adult males (open water + alcohol)
— ~70% of adult drownings involve alcohol or sedative use
— Risk factors: epilepsy (4–5× risk; bath > pool), long QT syndrome (LQT1 swim-triggered), autism spectrum (wandering to water), hyperventilation before breath-hold ("shallow-water blackout")
— Fresh vs salt water distinction is clinically irrelevant for management — do not pick that answer
— Primary insult is hypoxia, not electrolyte derangement
— Witnessed submersion, found floating, pulled from pool/bathtub/lake
— Toddler "missing for a few minutes" near a pool or filled bucket
— Unexplained pulmonary edema or hypoxemia in a swimmer/diver
— Cardiac arrest in cold water with prolonged downtime — consider survival despite long submersion
Board pearl: Any symptomatic drowning patient — even mild cough or transient desaturation — needs observation 4–8 hours for evolving pulmonary injury; completely asymptomatic patients with normal exam, normal vitals, and normal SpO₂ at 4–6 hours can be safely discharged.
— Grade 1: cough, normal auscultation → discharge after observation
— Grade 2: abnormal auscultation in some lung fields → O₂, observe
— Grade 3: acute pulmonary edema without hypotension → O₂, NIV, admit
— Grade 4: acute pulmonary edema with hypotension → ICU, intubation likely
— Grade 5: isolated respiratory arrest → ventilate, monitor for cardiac arrest
— Grade 6: cardiopulmonary arrest → CPR with rescue breaths first (hypoxic arrest)
— Submersion duration — strongest predictor of outcome; <5 min favorable, 5–10 min intermediate, >10 min poor, >25 min nearly uniformly fatal (warm water)
— Water temperature — cold water (<6°C) may permit neuroprotection and prolonged survival, especially in children
— Time to BLS/ALS and bystander CPR — early bystander rescue breathing is the single most modifiable survival factor
— Trauma mechanism — diving into shallow water (C-spine), boating, surfing → assume cervical injury
— Triggers/comorbidities — seizure, syncope, arrhythmia (LQTS), MI, hypoglycemia, stroke, alcohol, illicit drugs, suicide attempt
— Worsening within first 4–8 hours is typical; deterioration beyond 8 hours in an asymptomatic patient with normal vitals/SpO₂ is rare
— Persistent tachypnea, cough, or hypoxia → admit
— Vomiting is common from swallowed water and increases aspiration risk
Step 3 management: In the ED, document submersion time, water type/temp, witnessed status, time to CPR, downtime, return of spontaneous circulation (ROSC) interval, alcohol/drug use, and any prodrome — these data points drive triage and family counseling.
— Airway: vomitus/water in oropharynx — suction; do not delay ventilation to "drain water from the lungs"; Heimlich is contraindicated unless clear FB obstruction
— Breathing: tachypnea, accessory muscle use, crackles (often diffuse), wheeze (bronchospasm from aspirated water/chlorine), pink frothy sputum (pulmonary edema)
— Circulation: sinus tachycardia → bradyarrhythmias and asystole are typical arrest rhythms (hypoxic); VF less common
— Disability: GCS is the best early neurologic prognostic marker; fixed pupils on arrival in normothermia portend poor outcome
— Exposure: undress fully, check core temp with low-reading rectal/esophageal probe — hypothermia is the rule, not the exception
— Diffuse crackles → aspiration pneumonitis / pulmonary edema
— Focal findings → consider aspiration of FB, lobar pneumonia (later), pneumothorax from barotrauma during rescue ventilation
— Hypotension from hypoxic myocardial dysfunction, hypothermia-induced bradycardia, or third-spacing into injured lungs
— Cold-induced "diuresis" causes intravascular depletion → IV crystalloid resuscitation indicated
— Arrhythmias in hypothermic patients (<30°C): J (Osborn) waves, AF, then VF — handle gently, rough movement can precipitate VF
CCS pearl: Order continuous SpO₂, telemetry, core temperature, end-tidal CO₂ if intubated, and serial neuro exams. In a hypothermic arrest, continue CPR until rewarmed to ≥32–35°C before declaring death — "not dead until warm and dead." Pediatric submersions in icy water have documented intact survival after >30 min.
— Pulse oximetry (may be unreliable if peripherally vasoconstricted/cold)
— Fingerstick glucose — exclude hypoglycemia as cause/contributor
— Core temperature with low-reading probe
— 12-lead ECG — look for QTc prolongation (LQT1 swim-triggered), Brugada pattern, ischemia, Osborn waves of hypothermia
— Point-of-care ultrasound: B-lines (pulmonary edema), cardiac function, IVC
— ABG: mixed respiratory + metabolic acidosis from hypoxia/lactate; guides ventilation
— Lactate: marker of tissue hypoxia and prognosis
— BMP — electrolytes are usually normal; do not expect dramatic Na⁺ shifts (a classic exam distractor)
— CBC, coagulation panel — DIC can complicate severe cases
— Troponin — hypoxic myocardial injury; also screens for primary MI trigger in adults
— CK, urinalysis — rhabdomyolysis if prolonged immobility/cold
— LFTs, ethanol, urine drug screen, salicylate/acetaminophen if intentional
— β-hCG in reproductive-age women
— Type & screen if trauma suspected
— Chest X-ray: initial film may be normal in up to 30% of symptomatic patients; do not use a normal CXR to discharge a symptomatic patient. Findings evolve: perihilar/diffuse infiltrates → ARDS pattern
— Repeat CXR at 6 hours if symptoms persist
— CT head if altered mental status, suspected trauma, or focal neuro deficit
— CT C-spine if trauma mechanism
— CT chest reserved for atypical course, suspected FB, or persistent unexplained findings
Board pearl: A normal CXR in an asymptomatic patient with normal SpO₂ does not by itself justify discharge — clinical observation for 4–8 hours remains the standard.
Key distinction: Significant electrolyte abnormalities in drowning are rare in real practice; if a stem emphasizes hyponatremia with seizures after pool submersion, think water intoxication in a small child who swallowed large volumes — treat with hypertonic saline if symptomatic.
— Persistent hypoxia despite supplemental O₂ → consider ARDS protocol, evaluate P/F ratio
— Cardiac arrest survivor → post-arrest workup including echocardiogram, coronary evaluation if adult with possible ischemic trigger
— Recurrent or unexplained drowning, syncope while swimming, family history of sudden death → outpatient cardiology referral for QTc analysis, exercise/genetic testing for LQT1 (KCNQ1) — swim-triggered events are classic
— Seizure as suspected trigger → EEG, MRI brain, AED level if known epileptic
— Suspected non-accidental trauma in pediatric bathtub drowning → skeletal survey, ophthalmology for retinal hemorrhages, social work, mandatory CPS reporting
— Persistent infiltrates at 48–72 h → consider bronchoscopy for retained debris, secondary bacterial pneumonia
— Aspirated water pathogens: typically polymicrobial; Aeromonas (fresh water), Pseudomonas, Burkholderia pseudomallei (tropical), Vibrio (brackish/salt), fungi (Pseudallescheria/Scedosporium) — only treat empirically if grossly contaminated water or clinical infection
— Avoid early prognostication in the first 72 hours, especially with targeted temperature management
— Tools: serial neuro exam (motor response, brainstem reflexes), EEG (burst suppression, status myoclonus), MRI brain at 3–5 days (DWI restriction in cortex/basal ganglia), NSE biomarker trend
— Pediatric drowning survivors with >25 min submersion in warm water or persistent coma + absent brainstem reflexes at 24 h carry poor prognosis
Step 3 management: Adult drowning survivor with ROSC and no obvious provocation — obtain echocardiogram, troponin trend, coronary evaluation (CTA or cath as indicated), and outpatient cardiology + electrophysiology referral. A young swimmer with QTc >480 ms needs β-blocker initiation, activity counseling, and family screening.
— Asymptomatic + normal vitals + normal SpO₂ on room air + normal lung exam + reliable observer: observe 4–8 h in ED; discharge with return precautions
— Cough only, normal auscultation: observe 4–8 h, discharge if stable
— Abnormal lung exam or SpO₂ <94%: supplemental O₂, admit
— Pulmonary edema without hypotension: NIV (CPAP/BiPAP) preferred over intubation if mentation permits — recruits collapsed alveoli, reverses shunt
— Pulmonary edema with hypotension or AMS: intubate, mechanical ventilation with lung-protective settings (Vt 6 mL/kg IBW, PEEP titration, plateau <30), ICU
— Respiratory arrest only: assist ventilation, monitor closely for cardiac arrest
— Cardiac arrest: ACLS modified for hypoxia — 5 rescue breaths first, then standard cycles; treat reversible causes (hypoxia, hypothermia, hypovolemia)
— Compression-only CPR is inadequate; drowning arrest is hypoxic → ventilation is essential
— No evidence to support abdominal thrusts or postural drainage to "expel water"
— Aggressive O₂ + early PEEP > delayed intubation
— Fluid resuscitation for hypotension despite the wet lungs — patients are intravascularly dry from cold diuresis
— Mild (32–35°C): passive external rewarming, warm blankets, warm IV fluids
— Moderate (28–32°C): active external + warm humidified O₂, warmed IV fluids
— Severe (<28°C) or arrest: ECMO/cardiopulmonary bypass is the rewarming method of choice; consider transfer to ECMO center
CCS pearl: Order set for moderate-severe drowning — IV access ×2, NS bolus 20 mL/kg, supplemental O₂ titrated to SpO₂ ≥94%, NIV vs intubation by severity, continuous monitoring, warm blankets, core temp, CXR, ABG, lactate, BMP, troponin, ECG, glucose, ethanol, UDS, β-hCG if applicable, telemetry admit ± ICU.
— Albuterol nebulized 2.5–5 mg, repeat as needed
— Ipratropium 0.5 mg added for severe bronchospasm
— Inhaled racemic epinephrine if upper-airway edema from chemical irritants
— Systemic corticosteroids are not routinely recommended for drowning-associated lung injury — no mortality benefit, may increase infection risk (a classic Step 3 distractor: do not start methylprednisolone "for ARDS prevention" after drowning)
— Not prophylactic. Indicated only when:
— Heavily contaminated water (sewage, swamp)
— Clinical signs of pneumonia developing >48 h after event (fever, purulent sputum, new consolidation, leukocytosis)
— Empiric coverage tailored to exposure:
— Fresh water → ceftriaxone or pip-tazo (cover Aeromonas, gram-negatives)
— Salt/brackish → ceftriaxone + doxycycline (cover Vibrio)
— Hot tub / contaminated → antipseudomonal β-lactam
— Tropical exposure → ceftazidime or meropenem (cover Burkholderia pseudomallei — melioidosis)
— Lung-protective ventilation is the foundation; pharmacologically use sedation (propofol, fentanyl) and neuromuscular blockade (cisatracurium) for severe ARDS within 48 h if P/F <150 and patient-ventilator dyssynchrony
— Conservative fluid strategy after initial resuscitation
— Targeted temperature management: maintain 32–36°C for 24 h in comatose ROSC survivors (adult and pediatric per current AHA guidance), then controlled rewarming
— Avoid hyperthermia (>37.5°C) for 72 h — worsens neuro outcome
— Treat hyperglycemia (target 140–180 mg/dL), avoid hypoglycemia
— Seizures: levetiracetam or valproate; continuous EEG if comatose
Board pearl: Two wrong answer choices to memorize — "prophylactic antibiotics for all drownings" and "empiric corticosteroids to prevent ARDS" — both are not indicated.
— High-flow nasal cannula or non-rebreather for mild hypoxia
— NIV (CPAP 5–10 cm H₂O or BiPAP) is first-line for awake drowning patients with pulmonary edema/hypoxia — recruits alveoli, reverses shunt physiology, often avoids intubation
— Endotracheal intubation indications: GCS ≤8, refractory hypoxia despite NIV, hemodynamic instability, severe ARDS pattern, inability to protect airway
— Use RSI with awareness of full stomach (aspirated water/vomitus) — apply cricoid optional, suction available
— Confirm with capnography
— Tidal volume 6 mL/kg ideal body weight
— Plateau pressure <30 cm H₂O
— PEEP titrated up (higher PEEP often needed — washed-out surfactant)
— FiO₂ titrated to SpO₂ 88–95% or PaO₂ 55–80
— Permissive hypercapnia acceptable
— Refractory hypoxemia → prone positioning, neuromuscular blockade, inhaled pulmonary vasodilators, VV-ECMO
— Refractory cardiac arrest with shockable rhythm or hypothermia (ECPR/E-CPR)
— Severe hypothermia (<28°C) with arrest or instability — fastest rewarming modality (~6–10°C/h)
— Refractory ARDS with P/F <80 despite optimization
— Early transfer to ECMO-capable center for severe hypothermic arrest improves intact survival
— Nasogastric/orogastric tube — decompress swallowed water (large volumes in children) to reduce vomiting/aspiration
— Foley for urine output monitoring in critically ill
— Arterial line for severe ARDS
— Bronchoscopy for retained debris/FB or unexplained lobar collapse
Step 3 management: A pulseless 8-year-old pulled from an icy lake with core temp 24°C — initiate CPR with ventilation, do not declare death, transfer rapidly to ECMO center; continue CPR throughout transport. Intact neurologic recovery has been documented after >60 minutes of submersion in such scenarios.
— Higher baseline rates of cardiac disease — submersion may be secondary to acute MI, arrhythmia, syncope, or stroke; workup must include troponin trend, ECG, telemetry, and consider TTE
— Polypharmacy: β-blockers blunt tachycardic response; anticoagulants increase risk of intracranial/pulmonary hemorrhage after trauma or aggressive ventilation
— Reduced physiologic reserve → lower threshold for admission even with mild symptoms
— Bathtub drownings in elderly: consider syncope, seizure, hypoglycemia, orthostasis, and elder abuse/neglect — screen and document
— Higher mortality at any given submersion duration vs younger adults
— Rhabdomyolysis from prolonged immobility, hypothermia, or seizure can precipitate AKI — monitor CK, urine myoglobin, BMP; aggressive isotonic fluids targeting urine output 1–2 mL/kg/h
— Contrast-induced AKI risk if CT imaging required — use only when indicated; ensure adequate hydration
— Drug dosing: adjust renally cleared medications (β-lactams, levetiracetam, vancomycin) — important in ICU course
— Pre-existing CKD raises risk of fluid overload during resuscitation → use measured boluses with frequent reassessment
— Coagulopathy increases bleeding risk after trauma/aspiration
— Sedation: avoid long-acting benzodiazepines (lorazepam preferred among benzos for cirrhosis; propofol shorter-acting and preferred in ICU)
— Decreased clearance of opioids and acetaminophen — dose-reduce fentanyl, avoid scheduled APAP >2 g/day
— Susceptibility to spontaneous bacterial peritonitis and pneumonia — lower threshold for antibiotic coverage if clinical infection develops
Board pearl: In an elderly adult pulled from a tub, do not anchor on drowning — order ECG, troponin, glucose, electrolytes, and CT head to evaluate the trigger event (MI, arrhythmia, stroke, hypoglycemia, seizure). Treat the underlying cause to prevent recurrence.
— Toddlers (1–4 y): bathtubs, buckets, pools, toilets — drowning in <2 inches of water is possible
— School-age: pools, open water without supervision
— Adolescents: open water + alcohol/drugs + risk-taking
— Layered prevention (counsel at every well-child): isolation four-sided pool fencing ≥4 ft with self-closing self-latching gate (reduces drowning by ~50%), constant adult "touch supervision" of <5 yo near water, life jackets (not floaties) for boating, swim lessons from age 1+, CPR training for caregivers, never leave a child alone in a bathtub
— Bathtub drowning in infant/young child → mandatory consideration of non-accidental trauma; obtain skeletal survey, retinal exam, social work, CPS report
— Hypothermia protective effect strongest in small children → continue resuscitation longer; ECMO transfer considered
— Pediatric TTM: maintain 32–36°C, avoid fever for 72 h
— Unexplained drowning or near-drowning in a child or young adult swimmer → evaluate for LQT1 (KCNQ1 mutation) — swimming/exertion-triggered events are characteristic
— Family screening, ECG with QTc, exercise testing, β-blocker therapy, activity counseling
— Maternal hypoxia rapidly causes fetal hypoxia — prioritize maternal oxygenation and perfusion; "resuscitate the mother to resuscitate the fetus"
— After 20 weeks: left lateral tilt or manual uterine displacement during CPR to relieve aortocaval compression
— Continuous fetal heart rate monitoring after stabilization if viable gestation (≥23–24 wk)
— Imaging: do not withhold indicated CXR/CT — shielded abdomen; benefit outweighs minimal fetal dose
— Resuscitative hysterotomy (perimortem C-section) within 4–5 min of maternal arrest if ≥20 wk and no ROSC — improves maternal and fetal outcomes
Key distinction: A pediatric "drowning" in a tub is a safety event until proven otherwise; an adolescent open-water drowning is an alcohol/risk-behavior event; a young swimmer's unexplained drowning is a channelopathy event. Each has a different downstream evaluation.
— Aspiration pneumonitis — chemical injury within hours
— ARDS — surfactant washout, alveolar collapse, shunt physiology; peak at 24–72 h
— Secondary bacterial pneumonia — typically >48 h; consider when fever, leukocytosis, or new infiltrate appears late
— Pneumothorax/pneumomediastinum from positive-pressure ventilation or barotrauma
— Bronchospasm
— Pulmonary abscess (rare, contaminated water)
— Hypoxic-ischemic encephalopathy — leading cause of long-term disability and mortality among survivors
— Cerebral edema, seizures, status myoclonus
— Persistent vegetative state, minimally conscious state, severe spastic quadriparesis
— Cognitive/behavioral sequelae in children even after apparently "good" recovery — schedule neurodevelopmental follow-up
— Stress (Takotsubo) cardiomyopathy, transient LV dysfunction
— Arrhythmias: AF (cold), VF (severe hypothermia, ischemia), bradycardia
— Hypoxic myocardial injury with troponin elevation
— Acute kidney injury (ATN from shock, rhabdo, myoglobin)
— Rhabdomyolysis
— DIC (severe cases)
— Hypothermia-related coagulopathy and platelet dysfunction
— Electrolyte/glucose derangements
— Hemolysis (rare, large-volume fresh-water aspiration)
— Aspirated foreign body or vomitus → focal lung pathology
— PTSD, anxiety, depression in survivors and family members — refer for counseling
— Survivor's guilt in witnesses; significant for parents of pediatric victims
Board pearl: Worsening pulmonary status in a previously stable drowning patient at 48–72 h prompts evaluation for secondary bacterial pneumonia or evolving ARDS, not the discredited "secondary/delayed drowning" entity. New deterioration always demands a new diagnosis.
— Mechanical ventilation or NIV
— SpO₂ <94% on supplemental O₂
— Hemodynamic instability or vasopressor requirement
— Persistent altered mental status / GCS ≤13
— Severe hypothermia (<32°C) requiring active rewarming
— Post-cardiac arrest care (TTM, neuro monitoring)
— Significant arrhythmia
— Pediatric: any moderate-severe symptoms, lower threshold
— Mild symptoms with SpO₂ ≥94% on supplemental O₂
— Persistent cough, mild crackles, normal hemodynamics
— Need for telemetry, serial neuro/respiratory monitoring
— Asymptomatic with normal exam, vitals, SpO₂, and reliable home situation
— No worsening during observation window
— Critical care/pulmonology — ARDS management
— Cardiology/EP — unexplained drowning, prolonged QTc, post-arrest ischemic evaluation
— Neurology — seizures, prolonged coma, neuroprognostication
— Trauma surgery / neurosurgery — concomitant trauma, C-spine injury
— Pediatrics + child protection team — pediatric bathtub drownings, suspected NAT
— Psychiatry/social work — suspected suicide attempt, substance use, family support
— Toxicology — confirmed/suspected co-ingestion
— No ECMO capability at receiving facility for severe hypothermia, refractory ARDS, ECPR candidates
— No pediatric ICU for critical pediatric patient
— No neurosurgery for concomitant traumatic brain/spine injury
CCS pearl: A young adult with witnessed prolonged submersion, GCS 9 on arrival, intubated, P/F 120, lactate 6, core temp 30°C — admit to ICU, consult critical care and cardiology, initiate TTM 32–36°C after ROSC, lung-protective ventilation, and have ECMO team evaluate if oxygenation does not improve within hours. Document family discussion early.
— Cold-water immersion syndrome (no submersion): sudden cold-shock response → gasping, hyperventilation, tachycardia, hypertension; risk of arrhythmia and incapacitation within minutes. Treatment is rapid extrication, dry, rewarm; differs from drowning in that aspiration may not occur
— Hypothermia without drowning: prolonged cold exposure on land or in cold water without airway submersion — focus on rewarming, gentle handling, ECMO for severe cases
— Diving-related pulmonary barotrauma: ascent-related; pneumothorax, mediastinal emphysema, arterial gas embolism (sudden neuro deficits on surfacing) — hyperbaric O₂ is treatment
— Decompression sickness ("the bends"): joint pain, cutis marmorata, neurologic findings hours after dive; HBOT
— Salt-water aspiration syndrome (scuba divers): small-volume aspiration → cough, dyspnea, fever, chills hours later; supportive care
— Swimming-induced pulmonary edema (SIPE): healthy swimmers/triathletes — dyspnea, cough, pink frothy sputum during exertion in cold water; resolves within 24–48 h with O₂; recurrence common; consider workup for HTN, beta-agonist preventive use
— Shallow-water blackout: breath-hold after hyperventilation → loss of consciousness from hypoxia before hypercapnic drive; underwater LOC → drowning. Counsel against pre-dive hyperventilation
— Cold-induced laryngospasm/bronchospasm: especially in asthmatic swimmers; treat as asthma exacerbation
— Gastric content aspiration (Mendelson syndrome) — similar pulmonary pattern but without submersion
— Hydrocarbon aspiration — gasoline, kerosene; chemical pneumonitis
Key distinction: Drowning requires liquid submersion/immersion and respiratory impairment. A diver with neuro deficits on surfacing without airway compromise — think arterial gas embolism, not drowning, and the treatment is hyperbaric O₂, not just ventilation.
— Acute MI — chest pain, ECG changes, troponin elevation; order coronary evaluation in adults
— LQT1 (KCNQ1) — swim-/exertion-triggered arrhythmia in young swimmers; QTc >480; β-blocker, activity restriction, family screening
— Brugada syndrome — type 1 ECG pattern; nocturnal events
— HOCM — exertional syncope; ECG/echo
— Catecholaminergic polymorphic VT (CPVT) — exertional/emotional syncope in children
— Wolff-Parkinson-White — delta wave on ECG; ablation if symptomatic
— Seizure — epileptic patients have 4–5× drowning risk; bath > shower; ask about AED adherence
— Stroke — focal deficits, altered mentation in older patient
— Syncope — vasovagal, orthostatic, situational
— Hypoglycemia — diabetic on insulin, alcohol use
— Alcohol intoxication (~70% of adult drownings)
— Recreational drug use (opioids, sedatives, stimulants causing arrhythmia)
— Carbon monoxide on a boat (generators, engines)
— Electrolyte disturbances (hyperkalemia → arrhythmia)
— Diving injury → C-spine fracture, head injury
— Boat propeller, assault, fall from height
— Barotrauma in scuba diver
— Suicide attempt — screen with PHQ-9, psychiatric evaluation, safety plan
— Homicide/non-accidental trauma — pediatric bathtub events, suspicious histories
— Filicide — caregiver psychiatric illness; child protection referral
Step 3 management: Every adult drowning workup includes ECG, troponin, glucose, ethanol, UDS, CT head if AMS. Every pediatric drowning workup includes a careful history for caregiver supervision lapses and abuse indicators. Document the suspected trigger in the chart — it directs both treatment and prevention counseling.
— Asymptomatic after 4–8 h observation
— Normal vital signs, SpO₂ ≥95% on room air, clear lungs
— Normal mental status
— Reliable home environment with adult observer
— Understanding of return precautions
— Return for cough worsening, dyspnea, fever, chest pain, vomiting, confusion, or persistent fatigue
— Most deterioration occurs within first 8 h; late deterioration (>24 h) is almost always secondary pneumonia rather than "delayed drowning"
— Alcohol and water do not mix — explicit counseling, especially for adolescents/young adults
— Swim with a buddy, in supervised areas, within ability
— Life jackets for boating, open water; floaties/water wings are not safety devices
— Never swim alone if epileptic; shower instead of bathe; counsel families
— Hyperventilation before breath-hold is dangerous (shallow-water blackout) — counsel free-divers and swimmers
— CPR training for parents/caregivers/pool owners
— Four-sided pool fencing with self-closing, self-latching gate; cover hot tubs
— Drain buckets, kiddie pools, bathtubs immediately after use; close toilet lids in homes with toddlers
— Swim lessons from age 1+ (AAP recommendation revised — formal lessons reduce risk in 1–4 yo)
— Resume home meds; ensure AED adherence if epileptic
— β-blocker initiation if newly diagnosed LQTS
— Inhaled bronchodilator PRN if persistent bronchospasm
— No routine antibiotics or steroids
— PCP follow-up within 1–2 weeks
— Cardiology/EP if unexplained event in young patient
— Neurology if seizure-triggered
— Psychiatry if intentional or substance-related
— Pediatric developmental clinic for pediatric survivors of significant submersion
Board pearl: USPSTF and AAP both endorse drowning-prevention counseling as part of pediatric well-child visits — pool fencing, supervision, swim lessons, life jackets, CPR training.
— PCP visit within 1–2 weeks: review symptoms, pulmonary recovery, address triggers
— Repeat CXR not routine unless symptoms persist
— Pulse oximetry at home if any concern; return for SpO₂ <94%
— Reinforce return precautions and prevention counseling
— Post-Intensive Care Syndrome (PICS): screen for cognitive impairment, physical deconditioning, psychiatric symptoms
— Pulmonary clinic at 4–6 weeks: PFTs if persistent dyspnea; chest imaging if abnormal at discharge
— Neurology at 4–8 weeks: cognitive testing, seizure monitoring, MRI if delayed evaluation
— Cardiology if any structural/electrical disease identified
— Physical therapy, occupational therapy, speech/cognitive therapy as indicated
— Neurorehabilitation for hypoxic-ischemic injury — outcomes improve with structured rehab; pediatric patients require developmental tracking through school years
— Screen survivors for PTSD, depression, anxiety at 2- and 6-week visits (PHQ-9, GAD-7, PCL-5)
— Screen family members and witnesses, especially parents of pediatric victims
— Refer for trauma-focused CBT if symptomatic
— If event was a suicide attempt: psychiatric stabilization, safety plan, lethal-means counseling, outpatient psychiatry within 7 days, consider IOP/PHP
— Neurology within 1–2 weeks
— Review AED adherence, levels, triggers
— Counsel on shower vs bath, swimming with companion, water-activity safety
— EP within 1–2 weeks
— Initiate β-blocker (nadolol or propranolol)
— Activity restrictions per AHA/ACC guidance; consider ICD for high-risk features
— Genetic counseling and first-degree relative screening
Step 3 management: Schedule a structured follow-up cascade rather than a single visit — PCP at 1–2 weeks, specialty referrals at 2–6 weeks, mental health screening at 2 and 6 weeks, and developmental reassessment for pediatric patients at 3, 6, and 12 months.
— Suspected child abuse/neglect in pediatric drownings (bathtub, supervision lapse, inconsistent history, prior CPS contact, suspicious injuries) — physicians are mandated reporters; report to CPS regardless of certainty
— Elder abuse/neglect for older adults in bathtubs or with caregiver-dependent histories — report to APS
— Suspected suicide attempt — psychiatric hold (e.g., 5150 in CA or state equivalent) if patient remains a danger; document capacity assessment
— Avoid early prognostication; wait ≥72 h post-rewarming, post-TTM, and after sedation washout before formal neuroprognostication discussions
— Use multimodal data (exam, EEG, MRI, biomarkers) — no single test should drive withdrawal decisions
— Engage palliative care early for family support
— Document goals-of-care discussions, surrogate decision-makers, and advance directives
— Comatose patient requires surrogate decision-maker following state hierarchy (spouse → adult children → parents → siblings)
— For ECMO/ECPR, time-critical decisions may proceed under emergency exception; document attempts to reach surrogate
— Pediatric: parents consent; in suspected abuse, temporary custody may be transferred to state — coordinate with hospital legal/social work
— Discharging an asymptomatic patient without explicit return precautions
— Failing to communicate findings (e.g., prolonged QTc) to outpatient providers — this is a sentinel patient-safety failure
— Not reconciling AEDs at discharge for epileptic patients
— Not arranging mental health follow-up after intentional event
— Send a structured discharge summary to the PCP within 48 h, list pending studies, and confirm follow-up appointments before discharge
— "Not dead until warm and dead" — do not pronounce death in a hypothermic arrest until rewarmed to ≥32–35°C unless injuries are clearly incompatible with life or resuscitation poses provider danger
Board pearl: A toddler bathtub drowning with a vague caregiver history requires CPS report, skeletal survey, retinal exam, and social work consult — failure to initiate is a patient-safety and legal failure, not just a clinical oversight.
— Drowning = #2 unintentional injury death in children 1–4 y (after MVC)
— ~70% of adult drownings involve alcohol
— Epilepsy increases drowning risk 4–5×; bath > pool
— Four-sided isolation pool fencing reduces drowning ~50%
— Observation window for symptomatic drownings: 4–8 hours
— TTM target post-arrest: 32–36°C for 24 h
— Primary insult = hypoxia, not electrolytes
— Fresh vs salt water = clinically irrelevant
— Surfactant washout → alveolar collapse → shunt → ARDS pattern
— Hypoxic arrest → ventilation-first CPR
— Cold water in children → potential neuroprotection → continue resuscitation longer
— Drowning = airway under water → hypoxia
— Immersion syndrome = cold-shock response without submersion
— AGE (arterial gas embolism) = ascent injury → HBOT
— SIPE = exertional pulmonary edema during swimming
— Shallow-water blackout = pre-dive hyperventilation → hypoxic LOC underwater
— Mendelson = gastric acid aspiration pneumonitis
— Melioidosis = Burkholderia pseudomallei in tropical drowning
— "Near-drowning," "wet drowning," "dry drowning," "secondary drowning," "delayed drowning"
— No abdominal thrusts / Heimlich for "water in lungs"
— No prophylactic antibiotics
— No empiric corticosteroids
— No early prognostication (<72 h)
— No compression-only CPR for drowning arrest
— Unexplained drowning in young swimmer → LQT1 (KCNQ1) — β-blocker, family screening
Key distinction: Among all the buzzwords, the single most important clinical truth is that drowning is a hypoxic insult, and ventilation — bystander rescue breathing, NIV, intubation with PEEP — is the lifesaving intervention at every stage.
— "2-year-old pulled from pool, coughed briefly, now asymptomatic, normal exam, SpO₂ 99%, normal CXR. Next step?"
— Answer: Observe 4–8 hours in ED, discharge with return precautions, counsel on four-sided pool fencing and supervision. Wrong answers: prophylactic antibiotics, admit ICU, oral steroids, immediate discharge.
— "16-year-old competitive swimmer found unconscious in pool, ROSC after CPR. ECG shows QTc 510 ms. Family history of sudden death."
— Answer: LQT1, initiate β-blocker (nadolol/propranolol), activity restriction, genetic testing, first-degree relative screening. Wrong: ICD as first step, HCM workup as primary diagnosis.
— "6-year-old submerged in icy lake for 40 minutes, asystolic, core temp 22°C."
— Answer: Continue CPR with rescue breaths, transfer to ECMO/cardiopulmonary bypass center, do not terminate resuscitation until rewarmed to ≥32–35°C.
— "65-year-old diabetic on insulin found unconscious in bathtub."
— Answer: Check glucose, ECG, troponin, CT head — workup the trigger (hypoglycemia, MI, arrhythmia, stroke).
— "Day 3 of admission after drowning, new fever, increased infiltrate, leukocytosis."
— Answer: Secondary bacterial pneumonia — empiric coverage based on water exposure (e.g., ceftriaxone + doxy for salt water). Not "delayed drowning."
— "17-year-old boy, alcohol on board boat, pulled from lake, intubated, P/F 110."
— Answer: Lung-protective ventilation (Vt 6 mL/kg IBW, plateau <30, PEEP titration), ICU admit, counsel on alcohol + water risks at discharge.
— Answer: Suspect non-accidental trauma; skeletal survey, retinal exam, social work, mandatory CPS report.
Step 3 management: When stems describe a drowning, decode three things — severity (Szpilman), trigger (cardiac/neuro/tox/abuse), and disposition (observe/admit/ICU/transfer) — and the correct answer follows.
Drowning is a hypoxia-driven respiratory injury whose management hinges on early ventilation, severity-based disposition (Szpilman 1–6), identification of the underlying trigger, and structured prevention counseling — with abandoned legacy terminology, no role for prophylactic antibiotics or steroids, and an obligation to consider abuse, channelopathy, or cardiac/metabolic provocation in every case.
— Primary insult = hypoxia → ventilation-first CPR with rescue breaths; fresh vs salt water is clinically irrelevant; abandoned terms ("near-drowning," "dry/secondary drowning") are always wrong
— Disposition: asymptomatic + normal exam/vitals/SpO₂ + reliable home → observe 4–8 h then discharge; any symptom → admit; severe pulmonary edema, AMS, or arrest → ICU; severe hypothermia or refractory ARDS → ECMO center; continue resuscitation in hypothermic arrest until rewarmed ≥32–35°C ("not dead until warm and dead")
— Always ask why: workup the trigger — ECG/QTc (LQT1), troponin, glucose, ethanol, UDS, CT head, seizure/AED history; pediatric bathtub event mandates abuse evaluation + CPS report; adult bathtub event mandates evaluation for MI, arrhythmia, stroke, hypoglycemia
— Prevention is the Step 3 answer: four-sided isolation pool fencing (~50% risk reduction), touch supervision <5 y, life jackets, alcohol avoidance, swim lessons from age 1, CPR training, AED adherence in epileptics, shower-not-bathe counseling; no prophylactic antibiotics, no empiric steroids, no early prognostication before 72 h
Board pearl: If you remember nothing else — ventilate, observe 4–8 hours, find the trigger, prevent the next event, and never declare a hypothermic patient dead before they are warm.