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cardio.post-arrest.commotio-cordis.v1PRODUCTION
cardio.post-arrest.commotio-cordis.v1

Post-cardiac-arrest care — commotio cordis (R-on-T blunt chest impact)

cardiologyacuteadultpediatric
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12/12 authored

Canonical 12-phase frame with authored status for this dossier.

Current phase

Frame

Detailed

Commotio cordis = structurally normal heart + R-on-T VF from blunt precordial impact during 5–30 ms window pre-T-wave peak; survival dominated by AED time-to-shock; post-ROSC dominated by structural disease exclusion + channelopathy screen + sports-return decision (AED-NOT-ICD secondary prevention pattern); route to parent cardio.post-arrest.core.v1 for TTM + neuroprog

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commotio cordis mechanism + AED timing documented

Patient inputs (22)

Mean age ~15 yr in U.S. registry; pediatric resuscitation modifications below age 8; sports + protective-equipment counseling differs by age

>95% male predominance in registry — relevant for athlete-cohort epidemiology + counseling, not for treatment differences

Baseball / lacrosse / hockey puck / karate — defines venue + chest-protector equipment + secondary-prevention strategy; informs accessibility of AED programs

Witnessed impact-to-collapse <5 sec is highly specific for commotio cordis (R-on-T mechanism); witnessed → bystander CPR + AED accessibility drives outcome

CPR within 1 min dramatically improves outcome; CAHP/OHCA score input

AED within 3 min → 50%+ survival per Maron 2009 PMID 19741059; >3 min → survival drops sharply; venue AED program presence is the dominant prognostic factor

VF most common (~80%); asystole less common (~20%); informs prognosis + R-on-T mechanism confirmation

Critical to differentiate commotio cordis from unmasked LQTS / Brugada / CPVT / HCM presenting at the time of impact; positive family history mandates genetic + advanced imaging workup

Prior syncope, exertional symptoms, palpitations, or known cardiac disease points to underlying substrate rather than pure commotio cordis

Baseline + serial; AKI from post-arrest hypoperfusion; KDIGO 2012 staging

Often normal post-resolution; serial ECGs over 24–48h to detect unmasked LQTS (QTc), Brugada (V1–V3 type 1 pattern), CPVT (exertional polymorphic VT triggers), epsilon waves of ARVC; baseline for sports-return decision

Rule out HCM (septal hypertrophy ≥15 mm), ARVC, anomalous coronary origin, valvular disease — the underlying substrates most commonly missed in young athlete arrest

Often modestly elevated from chest-wall trauma + post-arrest stunning; rise pattern helps differentiate from ACS-mediated arrest (rare in this cohort)

Tissue hypoperfusion + post-arrest perfusion debt; clearance trajectory drives prognosis (SCAI 2022 PMID 35718438)

Rib fractures from CPR + sternal injury from impact; aspiration; pneumothorax

MAP ≥65 target post-ROSC; vasoplegia less common than ischemic-arrest cohorts because heart structurally normal; SCAI staging if shock

TTM target 33–37.5 °C × 24h (TTM2 PMID 34133859); follows AHA 2020 standard for comatose post-ROSC patients

Avoid hyperoxia: SpO2 92–98% (AHA 2020 Class IIa)

Cardiac MRI at 4–6 wk post-arrest if echo equivocal or channelopathy suspected — rule out ARVC, infiltrative disease, scar, anomalous coronary; allows post-arrest stunning to resolve before assessment

CT or MR coronary angiography if anomalous origin suspected (sudden death cause in athletes); especially considered in young athletes <35

Targeted gene panel if family history or sentinel ECG / clinical features — rules in / out LQTS, Brugada, CPVT, ARVC, HCM as substrate; informs family-screening cascade

High-energy projectile impact → consider chest CT if significant tenderness, deformity, hypoxia, or persistent troponin rise — rule out cardiac contusion, sternal fracture, pulmonary contusion, hemothorax

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Severity triggers (4)

4 need judgement
  • informationallife_threateningfailed_aed_defibrillation_despite_multiple_shocks
    Refractory VF / pulseless VT despite ≥3 AED shocks + amiodarone — uncommon in commotio cordis (typically responds to first AED shock if delivered <3 min); failure suggests prolonged low-flow time or unmasked substrate
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalseveremechanical_chest_complication_discovered
    Sternal fracture, cardiac contusion with reduced EF, hemothorax, or pulmonary contusion identified on CT chest — significant impact-related thoracic trauma
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalsevereicd_eligibility_evaluation_post_unmasked_substrate
    Unmasked structural disease (HCM, ARVC, anomalous coronary) or channelopathy (LQTS, Brugada, CPVT) identified during post-arrest workup — this transforms ICD decision from "no" to "yes"
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationalmoderatesports_return_clearance_decision_pending
    Patient ready for return-to-play decision after structural workup completed — shared decision with cardiology + EP + sports-medicine
    Trigger could not be auto-evaluated — needs clinician judgement.

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Recommended regimen

Commotio cordis post-arrest phenotype — standard post-ROSC bundle + structural-disease exclusion + sports-return decision pattern (AHA 2020 + AHA 2016 commotio cordis statement PMID 27045128 + Maron 2009 PMID 19741059)
axis: commotio_cordis_post_arrest_phenotype
Selected axis "Commotio cordis post-arrest phenotype — standard post-ROSC bundle + structural-disease exclusion + sports-return decision pattern (AHA 2020 + AHA 2016 commotio cordis statement PMID 27045128 + Maron 2009 PMID 19741059)" 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
    SOAP-II PMID 20200382; first-line post-ROSC vasoactive (uncommon need in this cohort given structurally normal heart)
    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 • IV • standard ACLS dosing
    triggers: recurrent_vf_pvt_post_rosc, sustained_vt_with_pulse
    AHA 2020 ACLS Class IIb; recurrent VT/VF in post-arrest period suggests unmasked substrate and warrants channelopathy workup
    rxcui 703
  • epinephrine
    first line
    inotrope_chronotrope_vasopressor
    1 mg IV q3-5 min during arrest • IV • standard ACLS
    triggers: cardiac_arrest, pea_asystole_during_index_arrest
    AHA 2020 ACLS
    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_post_arrest
    AHA 2020 ACLS Class IIa for TdP; QTc prolongation may emerge as unmasked LQTS substrate during post-arrest workup
    rxcui 6585
  • propofol
    first line
    sedative_iv_anesthetic
    5-50 µg/kg/min • IV • continuous; titrate RASS
    triggers: post_rosc_intubation_ttm
    PADIS 2018
    rxcui 8782
  • fentanyl
    first line
    opioid_analgesic
    25-200 µg/h • IV • continuous
    triggers: post_rosc_intubation_ttm, chest_wall_impact_pain, shivering_control
    PADIS 2018; analgesia (chest-wall trauma) + shivering suppression for TTM
    rxcui 4337
  • metoprolol
    comorbidity specific
    beta_blocker_beta1_selective
    25-100 mg PO BID • PO • BID
    triggers: unmasked_long_qt_syndrome_diagnosis, unmasked_cpvt_diagnosis, unmasked_hcm_diagnosis
    HRS 2017 PMID 28219760 — beta-blocker Class I for symptomatic LQTS or CPVT; PHASE-prevention if substrate unmasked during workup
    rxcui 6918

outpatient playbook — drug actions (1)

  1. 1. continue channelopathy regimen if unmasked
    rxcui 6918
    nadolol or metoprolol per indication • PO • daily
    trigger: unmasked LQTS / CPVT
    HRS 2017

Auto-drafted A&P note

outpatient

Subjective

- Possible entry pathways: ROSC after commotio cordis cardiac arrest — young athlete with witnessed blunt precordial impact then immediate collapse; Witnessed precordial blunt impact (baseball, lacrosse, hockey puck, karate strike) immediately followed by collapse — classic commotio cordis trigger (Maron & Estes 2010 PMID 20335586); Young athlete (typical age 8–25) with witnessed sports-related sudden arrest with no known underlying cardiac disease — commotio cordis high on differential.

Objective

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

Assessment

**Post-cardiac-arrest care — commotio cordis (R-on-T blunt chest impact)** (cardio.post-arrest.commotio-cordis.v1).
Phenotype framing: Pure commotio cordis (structurally normal) vs unmasked underlying disease (LQTS, Brugada, CPVT, HCM, ARVC, anomalous coronary) vs cardiac contusion vs concomitant traumatic injuries — this differential drives the entire long-term plan (sports return + ICD vs no ICD)
Scope: Commotio cordis = structurally normal heart + R-on-T VF from blunt precordial impact during 5–30 ms window pre-T-wave peak; survival dominated by AED time-to-shock; post-ROSC dominated by structural disease exclusion + channelopathy screen + sports-return decision (AED-NOT-ICD secondary prevention pattern); route to parent cardio.post-arrest.core.v1 for TTM + neuroprog

No severity triggers fired against current inputs.

Plan

Regimen axis: **Commotio cordis post-arrest phenotype — standard post-ROSC bundle + structural-disease exclusion + sports-return decision pattern (AHA 2020 + AHA 2016 commotio cordis statement PMID 27045128 + Maron 2009 PMID 19741059)**.
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 (uncommon need in this cohort given structurally normal heart)
2. amiodarone 300 mg IV bolus → 150 mg if recurrent → 1 mg/min × 6h → 0.5 mg/min × 18h IV standard ACLS dosing (class_iii_antiarrhythmic, first line) — AHA 2020 ACLS Class IIb; recurrent VT/VF in post-arrest period suggests unmasked substrate and warrants channelopathy workup
3. epinephrine 1 mg IV q3-5 min during arrest IV standard ACLS (inotrope_chronotrope_vasopressor, first line) — AHA 2020 ACLS
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; QTc prolongation may emerge as unmasked LQTS substrate during post-arrest workup
5. propofol 5-50 µg/kg/min IV continuous; titrate RASS (sedative_iv_anesthetic, first line) — PADIS 2018
6. fentanyl 25-200 µg/h IV continuous (opioid_analgesic, first line) — PADIS 2018; analgesia (chest-wall trauma) + shivering suppression for TTM
7. metoprolol 25-100 mg PO BID PO BID (beta_blocker_beta1_selective, comorbidity specific) — HRS 2017 PMID 28219760 — beta-blocker Class I for symptomatic LQTS or CPVT; PHASE-prevention if substrate unmasked during workup

Setting playbook (outpatient) — Long-term cardiology / EP surveillance; sports-medicine partnership for return-to-play monitoring; family and team CPR/AED maintenance; mental health long-term; sports-program safety advocacy (chest protector + venue AED)
8. continue channelopathy regimen if unmasked nadolol or metoprolol per indication PO daily — unmasked LQTS / CPVT (HRS 2017)

Non-pharmacologic actions:
- NO ICD if pure commotio cordis with no substrate (AHA 2016 PMID 27045128)
- ICD per HRS 2017 if confirmed channelopathy or structural CM with documented arrest
- Sport chest-protector compliance (NOCSAE ND200 for lacrosse goalies)
- Venue AED program advocacy + family CPR + AED ongoing
- Mental health long-term

AVOID / contraindication checks:
- Beta_blocker_avoid_acute_cardiogenic_shock (AHA 2020)
- Routine_icd_NOT_indicated_in_pure_commotio_cordis_with_structurally_normal_heart (AHA 2016 commotio cordis statement PMID 27045128)
- Return_to_sports_only_after_complete_structural_workup (AHA 2016 Bethesda eligibility recommendations)

Monitoring

Regimen monitoring:
- continuous ecg telemetry x 24-48h for unmasked arrhythmia substrate (AHA 2020)
- serial ecg q6h x 24h for qtc brugada channelopathy emergence (HRS 2017 PMID 28219760)
- serial troponin q3-6h x 24h (4th UDMI 2018)
- BMP q6h + K + Mg (post-arrest electrolyte support)
- continuous core temp via bladder or esophageal probe during TTM (TTM2)
- continuous EEG for 24-48h (Sandroni 2021)
- NSE at 24h 48h 72h (Sandroni 2021)
- lactate q2-4h until normalized (SCAI 2022)
- cardiac MRI at 4-6 wk if structural workup equivocal (AHA 2016)
- genetic panel if family history or sentinel features (HRS 2017)

Setting (outpatient) monitoring:
- Annual ECG + echo q2-3 yr
- Annual Holter if channelopathy regimen

Follow-up plan: Cardiology + EP follow-up at 2–4 weeks for echo + ECG + Holter; cardiac MRI at 4–6 wk if structural workup equivocal; genetic testing if family history positive; sports-return clearance shared decision (typically permitted after complete evaluation if no substrate); family CPR + AED training; advocacy for venue AED programs (LifeVest 4hold AED + USA Lacrosse / NOCSAE chest protector ND200 advocacy); mental health (PTSD common in athlete + family); school + team incident debrief
- Close-out criterion: cardiology + EP + sports-return decision + family + AED advocacy + mental health follow-up booked

Monitoring phase: Continuous telemetry × 24–48h for unmasked arrhythmia substrate; multimodal neuroprog ≥72h post-rewarm (Sandroni 2021 PMID 33745427); serial ECG q6h × 24h for QTc / Brugada / channelopathy emergence; BMP q6h

Disposition

Current setting: outpatient — Long-term cardiology / EP surveillance; sports-medicine partnership for return-to-play monitoring; family and team CPR/AED maintenance; mental health long-term; sports-program safety advocacy (chest protector + venue AED)

Disposition criteria:
- Long-term continuation; cross-link to cardio.cm.hcm.v1 (if HCM unmasked), cardio.cm.arvc.v1 (if ARVC unmasked), or appropriate channelopathy engine if substrate identified

Escalation triggers (move to higher acuity):
- Repeat commotio cordis-like event → ED + EP urgent
- New unmasked channelopathy or structural disease → EP + revise sports decision
- Mental health crisis → psychiatry

Earlier-Return Triggers

Return-precaution thresholds (watch for):
- [LIFE_THREATENING] Refractory VF / pulseless VT despite ≥3 AED shocks + amiodarone — uncommon in commotio cordis (typically responds to first AED shock if delivered <3 min); failure suggests prolonged low-flow time or unmasked substrate
- [SEVERE] Sternal fracture, cardiac contusion with reduced EF, hemothorax, or pulmonary contusion identified on CT chest — significant impact-related thoracic trauma
- [SEVERE] Unmasked structural disease (HCM, ARVC, anomalous coronary) or channelopathy (LQTS, Brugada, CPVT) identified during post-arrest workup — this transforms ICD decision from "no" to "yes"

Citations

- AHA 2016 Scientific Statement on Eligibility & Disqualification Recommendations for Competitive Athletes — Task Force 13 (commotio cordis section) + Maron 2009 U.S. Commotio Cordis Registry + AHA 2020 ACLS / Post-Cardiac-Arrest Care + TTM2 + Sandroni 2021 neuroprog + HRS 2017 inherited arrhythmia consensus [PMID:27045128](https://pubmed.ncbi.nlm.nih.gov/27045128/)
- Cited evidence (PMID 20335586) [PMID:20335586](https://pubmed.ncbi.nlm.nih.gov/20335586/)
- Cited evidence (PMID 19741059) [PMID:19741059](https://pubmed.ncbi.nlm.nih.gov/19741059/)
- Cited evidence (PMID 9603797) [PMID:9603797](https://pubmed.ncbi.nlm.nih.gov/9603797/)
- Cited evidence (PMID 33081530) [PMID:33081530](https://pubmed.ncbi.nlm.nih.gov/33081530/)

Last reconciled with current guidelines: 2026-05-15.
References
  • AHA 2016 Scientific Statement on Eligibility & Disqualification Recommendations for Competitive Athletes — Task Force 13 (commotio cordis section) + Maron 2009 U.S. Commotio Cordis Registry + AHA 2020 ACLS / Post-Cardiac-Arrest Care + TTM2 + Sandroni 2021 neuroprog + HRS 2017 inherited arrhythmia consensus — PMID:27045128
  • Cited evidence (PMID 20335586) — PMID:20335586
  • Cited evidence (PMID 19741059) — PMID:19741059
  • Cited evidence (PMID 9603797) — PMID:9603797
  • Cited evidence (PMID 33081530) — PMID:33081530