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cardio.post-arrest.drowning-cardiac.v1PRODUCTION
cardio.post-arrest.drowning-cardiac.v1

Post-cardiac-arrest care — drowning-induced cardiac arrest

cardiologyacuteadult
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12/12 authored

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Drowning-induced cardiac arrest — hypoxic mechanism with PEA/asystole most common; secondary hypothermia + hyperkalemia + acidosis common; cold-water drowning with rapid cooling can have favorable neuro outcomes after prolonged downtime; route to parent cardio.post-arrest.core.v1 for TTM + neuroprog arc

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drowning mechanism + thermal status confirmed

Patient inputs (19)

Pediatric drownings have different prognosis (separate engine ideally); adult drownings often have alcohol / drug / cardiac trigger

Submersion time + water temperature drive prognosis; <10 min submersion in warm water has favorable outcomes; cold water tolerates longer

Cold water (<6 °C) preceding arrest = rapid cooling + favorable prognosis even after prolonged downtime (Schneider 2014); warm water = standard prognosis weighting

Witnessed + bystander CPR + low-flow time → favourable neuro prognosis + ECPR eligibility (AHA 2020; ARREST PMID 33308475)

Asystole/PEA most common (hypoxic mechanism); VF possible if hypothermia + electrolyte derangement; rhythm does NOT predict prognosis in cold-water drowning

CPR duration → ECPR eligibility (ELSO drowning <90 min low-flow); cold-water cases can survive >60 min downtime per Schneider 2014

AKI common post-arrest; rhabdomyolysis if prolonged immersion / down-time; drug renal-adjustment

Hypothermia ECG features (Osborn J wave at junction; bradycardia; AF common); rule out underlying ischemic / channelopathy trigger for the drowning event

Cardiac etiology workup if ischemic precipitant suspected (LQTS, Brugada, ACS triggered the submersion); also rises from prolonged hypoxia + arrest itself

Tissue hypoperfusion + anaerobic metabolism; clearance trajectory drives prognosis (SCAI 2022 PMID 35718438)

Hyperkalemia common (hypoxia + cell-membrane damage + acidosis); K >12 mmol/L in drowning → very poor prognosis marker per ELSO drowning consensus; correct to 4-4.5

ARDS diagnosis (P/F <300 with bilateral infiltrates not fully explained by HF); guides PEEP + proning decision (PROSEVA P/F <150 → prone)

Bilateral infiltrates + pulmonary edema common; ARDS diagnosis support; aspiration pneumonia evolution; pneumothorax from CPR

MAP ≥65 target post-ROSC; SCAI staging if shock; hypothermia produces transient bradycardia + hypotension that improves with warming

Core temp <30 °C → withhold further ACLS drugs + defib >1 attempt until warmed; 30-34 °C → space drugs to q6-10 min; warm to 32-35 °C before declaring death (AHA 2020 §hypothermia)

Avoid hyperoxia: SpO2 92-98% (AHA 2020 Class IIa); ARDS may require higher FiO2 + PEEP per ARDSnet

Diving-related drownings have C-spine injury risk — MILS during airway management + CT C-spine

Adult drownings: alcohol ~50 % + sedative drugs common precipitants; obtain ETOH + comprehensive UDS

LV/RV function; rule out cardiac trigger (ACS, channelopathy with arrhythmia → submersion); post-arrest myocardial dysfunction

* = hard-required. Engine cannot meaningfully run until these are filled.

Severity triggers (5)

5 need judgement
  • informationallife_threateningsevere_hypothermia_below_30c_with_arrest
    Core temperature <30 °C in drowning-induced arrest — withhold further ACLS drug doses + limit defib to 1 attempt until warmed; warm to 32-35 °C before declaring death (AHA 2020 hypothermia section)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningecpr_eligibility_drowning_witnessed_low_flow_below_90min_core_28_to_32_with_vf_or_asystole
    Witnessed drowning + low-flow time <90 min + core temp 28-32 °C with VF/asystole at presentation + ROSC achievable post-warming — ECMO bridge candidate per ELSO drowning + Schneider 2014
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningsevere_hyperkalemia_above_10mmol_with_drowning_arrest
    Serum K >10 mmol/L on arrival from drowning arrest — historically poor prognosis marker per ELSO drowning consensus, but cold-water + witnessed cases warrant continued resuscitation
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseveresevere_ards_post_drowning_pf_below_150
    Severe ARDS post-drowning (P/F <150 with bilateral infiltrates) — proning per PROSEVA + neuromuscular blockade per ACURASYS (controversial); VV-ECMO if refractory
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseverecervical_spine_or_co_existing_trauma_with_drowning_arrest
    Diving / unwitnessed / suspected trauma → C-spine immobilization + CT C-spine + trauma surgery activation + MILS during airway management
    Trigger could not be auto-evaluated — needs clinician judgement.

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Recommended regimen

Drowning-induced post-arrest phenotype — modified ACLS for hypothermia + active warming + ARDS management + ECPR bridge consideration (AHA 2020 + Schneider 2014 + ELSO drowning)
axis: drowning_post_arrest_phenotype
Selected axis "Drowning-induced post-arrest phenotype — modified ACLS for hypothermia + active warming + ARDS management + ECPR bridge consideration (AHA 2020 + Schneider 2014 + ELSO drowning)" by default fallback (first axis)
  • norepinephrine
    first line
    vasopressor_alpha1_beta1
    0.05-0.5 µg/kg/min titrate MAP ≥65 • IV • continuous
    triggers: post_rosc_vasoplegia, rewarming_vasodilation_shock
    SOAP-II PMID 20200382; first-line post-ROSC vasoactive
    rxcui 7512
  • amiodarone
    first line
    class_iii_antiarrhythmic
    300 mg IV bolus → 150 mg if recurrent → 1 mg/min × 6h → 0.5 mg/min × 18h; HOLD additional doses if core <30 °C • IV • modified for hypothermia
    triggers: recurrent_vf_pvt_post_rewarming
    AHA 2020 ACLS Class IIb; in hypothermia limit to 1 dose until warmed >30 °C, then resume standard cadence
    rxcui 703
  • epinephrine
    first line
    inotrope_chronotrope_vasopressor
    1 mg IV q3-5 min if normothermic; if core <30 °C → withhold further doses; if 30-34 °C → space q6-10 min • IV • modified for hypothermia
    triggers: cardiac_arrest, pea_asystole_warm_core
    AHA 2020 ACLS — modified dosing intervals for hypothermia
    rxcui 3992
  • magnesium sulfate
    add on
    electrolyte_anti_arrhythmic
    1-2 g IV • IV • one-time + repeat for TdP
    triggers: torsades_de_pointes, long_qt_unmasked
    AHA 2020 ACLS Class IIa for TdP; correct hypomagnesemia first
    rxcui 6585
  • propofol
    first line
    sedative_iv_anesthetic
    5-50 µg/kg/min • IV • continuous; titrate RASS
    triggers: post_rosc_intubation_ttm
    PADIS 2018; hepatic metabolism slowed in hypothermia → reduce dose during cooling
    rxcui 8782
  • fentanyl
    first line
    opioid_analgesic
    25-200 µg/h • IV • continuous
    triggers: post_rosc_intubation_ttm, shivering_control
    PADIS 2018; analgesia + shivering suppression for TTM
    rxcui 4337
  • tranexamic acid
    add on
    antifibrinolytic
    1 g IV over 10 min • IV • within 3h of bleeding onset
    triggers: cervical_spine_trauma_with_bleeding, co_existing_trauma_with_bleeding
    CRASH-2 PMID 20554319 if traumatic bleeding co-existing with drowning
    rxcui 10691
  • ceftriaxone
    add on
    cephalosporin_3rd_gen
    2 g IV daily • IV • daily
    triggers: aspiration_pneumonia_clinically_developing, sepsis_post_drowning
    Early empiric for aspiration pneumonia from drowning — typically broad gram-negative + anaerobe coverage; consider piperacillin-tazobactam if water-source contamination concern
    rxcui 2193

outpatient playbook — drug actions (2)

  1. 1. continue channelopathy regimen
    rxcui 6918
    nadolol or propranolol per type • PO • daily
    trigger: LQTS or CPVT
    HRS 2017
  2. 2. continue HF GDMT if structural CM
    rxcui 1656328
    sacubitril-valsartan + carvedilol + spironolactone + SGLT2i max tolerated • PO • as scheduled
    trigger: structural CM HFrEF
    ACC/AHA 2022 HF 4-pillar

Auto-drafted A&P note

outpatient

Subjective

- Possible entry pathways: ROSC after submersion / drowning-induced cardiac arrest (AHA 2020 §drowning); Comatose patient post-drowning with core temp <32 °C — extended ACLS warranted; TTM candidate (Schneider 2014 PMID 25034567); Witnessed drowning + low-flow <90 min + core temp 28-32 °C with VF/asystole — ECMO/ECPR consideration (ELSO drowning protocol).

Objective

- No vitals, labs, or imaging entered for this encounter.

Assessment

**Post-cardiac-arrest care — drowning-induced cardiac arrest** (cardio.post-arrest.drowning-cardiac.v1).
Phenotype framing: Primary drowning event (alcohol, fatigue, cold incapacitation) vs secondary drowning trigger (cardiac arrhythmia → unconsciousness → submersion: LQTS, Brugada, CPVT; or ischemic/structural cardiac); also seizure, syncope, head trauma, scuba/diving barotrauma
Scope: Drowning-induced cardiac arrest — hypoxic mechanism with PEA/asystole most common; secondary hypothermia + hyperkalemia + acidosis common; cold-water drowning with rapid cooling can have favorable neuro outcomes after prolonged downtime; route to parent cardio.post-arrest.core.v1 for TTM + neuroprog arc

No severity triggers fired against current inputs.

Plan

Regimen axis: **Drowning-induced post-arrest phenotype — modified ACLS for hypothermia + active warming + ARDS management + ECPR bridge consideration (AHA 2020 + Schneider 2014 + ELSO drowning)**.
1. norepinephrine 0.05-0.5 µg/kg/min titrate MAP ≥65 IV continuous (vasopressor_alpha1_beta1, first line) — SOAP-II PMID 20200382; first-line post-ROSC vasoactive
2. amiodarone 300 mg IV bolus → 150 mg if recurrent → 1 mg/min × 6h → 0.5 mg/min × 18h; HOLD additional doses if core <30 °C IV modified for hypothermia (class_iii_antiarrhythmic, first line) — AHA 2020 ACLS Class IIb; in hypothermia limit to 1 dose until warmed >30 °C, then resume standard cadence
3. epinephrine 1 mg IV q3-5 min if normothermic; if core <30 °C → withhold further doses; if 30-34 °C → space q6-10 min IV modified for hypothermia (inotrope_chronotrope_vasopressor, first line) — AHA 2020 ACLS — modified dosing intervals for hypothermia
4. magnesium sulfate 1-2 g IV IV one-time + repeat for TdP (electrolyte_anti_arrhythmic, add on) — AHA 2020 ACLS Class IIa for TdP; correct hypomagnesemia first
5. propofol 5-50 µg/kg/min IV continuous; titrate RASS (sedative_iv_anesthetic, first line) — PADIS 2018; hepatic metabolism slowed in hypothermia → reduce dose during cooling
6. fentanyl 25-200 µg/h IV continuous (opioid_analgesic, first line) — PADIS 2018; analgesia + shivering suppression for TTM
7. tranexamic acid 1 g IV over 10 min IV within 3h of bleeding onset (antifibrinolytic, add on) — CRASH-2 PMID 20554319 if traumatic bleeding co-existing with drowning
8. ceftriaxone 2 g IV daily IV daily (cephalosporin_3rd_gen, add on) — Early empiric for aspiration pneumonia from drowning — typically broad gram-negative + anaerobe coverage; consider piperacillin-tazobactam if water-source contamination concern

Setting playbook (outpatient) — Long-term cardiology / EP / pulmonology surveillance; ICD management if channelopathy or structural; substance-use long-term; mental health long-term; aquatic safety / activity reintegration
9. continue channelopathy regimen nadolol or propranolol per type PO daily — LQTS or CPVT (HRS 2017)
10. continue HF GDMT if structural CM sacubitril-valsartan + carvedilol + spironolactone + SGLT2i max tolerated PO as scheduled — structural CM HFrEF (ACC/AHA 2022 HF 4-pillar)

Non-pharmacologic actions:
- ICD/WCD adherence
- Activity reintegration with aquatic-safety protocols
- Family CPR/AED ongoing
- Mental health long-term
- Substance-use recovery long-term

AVOID / contraindication checks:
- Beta_blocker_avoid_acute_cardiogenic_shock (AHA 2020)
- Epinephrine_withhold_core_temp_below_30 (AHA 2020 hypothermia section)
- Defib_limit_to_1_attempt_at_core_temp_below_30 (AHA 2020 hypothermia section)
- Ace_inhibitor_relative_acute_phase_acute_kidney_injury (AHA 2020)

Monitoring

Regimen monitoring:
- continuous ecg telemetry (AHA 2020 Class I)
- serial troponin q2-3h x 3 then q6h (4th UDMI 2018)
- BMP q6-12h + Mg + K (drowning-associated electrolyte derangement) (AHA 2020)
- continuous core temp via bladder or esophageal probe during warming and TTM (AHA 2020 + TTM2)
- continuous EEG for 24-48h (Sandroni 2021)
- NSE at 24h 48h 72h (Sandroni 2021) — interpret with caution if hypothermia confounding
- ABG q4-6h until P/F stable (ARDSnet)
- CXR daily for ARDS evolution or VAP (ARDSnet)
- lactate q2-4h until normalized (SCAI 2022)

Setting (outpatient) monitoring:
- Quarterly BP + weight + symptom score
- Annual ECG + Holter if channelopathy
- Annual echo if HFrEF

Follow-up plan: Pulmonology follow-up for ARDS sequelae; cardiology + EP follow-up if cardiac trigger (LQTS, Brugada, structural); rehab for cognitive sequelae; mental health (post-arrest PTSD, family); substance-use referral if alcohol/drug precipitated; aquatic safety education
- Close-out criterion: pulmonology + cardiology / EP + rehab + mental health + family-counseling plan booked

Monitoring phase: Continuous telemetry + arterial line + central line + Foley; lactate q2-4h; BMP q6-12h; serial troponin; ABG q4-6h until P/F stable; multimodal neuroprog ≥72h post-rewarm with caution if hypothermia confounding (Sandroni 2021 PMID 33745427)

Disposition

Current setting: outpatient — Long-term cardiology / EP / pulmonology surveillance; ICD management if channelopathy or structural; substance-use long-term; mental health long-term; aquatic safety / activity reintegration

Disposition criteria:
- Long-term continuation; cross-link to cardio.hf.core.v1 for chronic HFrEF; cardio.ascvd.chronic.v1 for secondary prevention

Escalation triggers (move to higher acuity):
- ICD therapy delivered → urgent EP; consider catheter ablation per VANISH (PMID 27149033) if structural substrate
- EF declining despite GDMT → advanced HF eval
- Substance-use relapse with safety risk → urgent intervention

Earlier-Return Triggers

Return-precaution thresholds (watch for):
- [LIFE_THREATENING] Core temperature <30 °C in drowning-induced arrest — withhold further ACLS drug doses + limit defib to 1 attempt until warmed; warm to 32-35 °C before declaring death (AHA 2020 hypothermia section)
- [LIFE_THREATENING] Witnessed drowning + low-flow time <90 min + core temp 28-32 °C with VF/asystole at presentation + ROSC achievable post-warming — ECMO bridge candidate per ELSO drowning + Schneider 2014
- [LIFE_THREATENING] Serum K >10 mmol/L on arrival from drowning arrest — historically poor prognosis marker per ELSO drowning consensus, but cold-water + witnessed cases warrant continued resuscitation

Citations

- AHA 2020 ACLS / Post-Cardiac-Arrest Care drowning + hypothermia sections + ELSO drowning consensus + ARDSnet + PROSEVA + Schneider 2014 cold-water drowning [PMID:33081530](https://pubmed.ncbi.nlm.nih.gov/33081530/)
- Cited evidence (PMID 25034567) [PMID:25034567](https://pubmed.ncbi.nlm.nih.gov/25034567/)
- Cited evidence (PMID 34133859) [PMID:34133859](https://pubmed.ncbi.nlm.nih.gov/34133859/)
- Cited evidence (PMID 31532382) [PMID:31532382](https://pubmed.ncbi.nlm.nih.gov/31532382/)
- Cited evidence (PMID 33745427) [PMID:33745427](https://pubmed.ncbi.nlm.nih.gov/33745427/)

Last reconciled with current guidelines: 2026-05-14.
References
  • AHA 2020 ACLS / Post-Cardiac-Arrest Care drowning + hypothermia sections + ELSO drowning consensus + ARDSnet + PROSEVA + Schneider 2014 cold-water drowning — PMID:33081530
  • Cited evidence (PMID 25034567) — PMID:25034567
  • Cited evidence (PMID 34133859) — PMID:34133859
  • Cited evidence (PMID 31532382) — PMID:31532382
  • Cited evidence (PMID 33745427) — PMID:33745427