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ICU TopicsCardiovascular

ICU · Cardiovascular

Arrhythmia, cardiac arrest and post-arrest care

Also known as Cardiac arrest · Advanced Life Support (ALS) · Post-cardiac arrest syndrome · Targeted temperature management (TTM) · Ventricular fibrillation (VF) · Refractory VF · Extracorporeal CPR (ECPR)

Cardiac arrest in the ICU requires immediate Advanced Life Support per ERC 2021 guidelines: high-quality CPR (rate 100-120, depth 5-6cm, full recoil), early defibrillation for shockable rhythms (VF/pVT), adrenaline 1 mg IV every 3-5 minutes, amiodarone 300 mg for refractory VF. Post-arrest care per ERC/ESICM 2021: targeted temperature management (TTM2: normothermia with fever prevention is as good as 33C hypothermia, which caused more haemodynamically compromising arrhythmia), urgent coronary angiography for a cardiac cause, lung-protective ventilation, haemodynamic optimisation, neuroprognostication deferred to at least 72 hours. ECPR for refractory cardiac arrest in selected, high-volume centres.

high33 referencesUpdated 19 Aug 202614 min readSource-verified · Sept 2026

Checked against its sources on 11 Sept 2026

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CICMFFICMEDIC

Red flags

  • TTM2 trial (NEJM 2021): hypothermia at 33C is NOT superior to normothermia — maintain normothermia and prevent fever; 33C caused more arrhythmia with haemodynamic compromise
  • Do NOT prognosticate before 72 hours post-ROSC (especially if sedatives or TTM used) — use a multimodal panel, never a single predictor
  • Adrenaline improved 30-day survival in PARAMEDIC2 but NOT favourable neurologic outcome at discharge, with more severe neurologic impairment among survivors
  • ECPR is an option for refractory cardiac arrest only in experienced, high-volume centres with strict patient selection (young, witnessed, shockable rhythm)
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Practise this topic8 MCQs with explanations

Target exams

CICMFFICMEDIC

Red flags

  • TTM2 trial (NEJM 2021): hypothermia at 33C is NOT superior to normothermia — maintain normothermia and prevent fever; 33C caused more arrhythmia with haemodynamic compromise
  • Do NOT prognosticate before 72 hours post-ROSC (especially if sedatives or TTM used) — use a multimodal panel, never a single predictor
  • Adrenaline improved 30-day survival in PARAMEDIC2 but NOT favourable neurologic outcome at discharge, with more severe neurologic impairment among survivors
  • ECPR is an option for refractory cardiac arrest only in experienced, high-volume centres with strict patient selection (young, witnessed, shockable rhythm)
In one line

Cardiac arrest is the heart stopped — unconscious, no pulse, no breathing. Run the ALS algorithm: high-quality CPR (100 to 120 per min, 5 to 6 cm, full recoil) → defibrillate VF/pVT immediately (biphasic energy per manufacturer, typically 150 to 200 J) → adrenaline 1 mg IV every 3 to 5 min → amiodarone 300 mg for refractory VF → hunt the 4Hs and 4Ts. After ROSC: keep the patient normothermic and prevent fever (TTM2 buried 33 degrees — do not cool), urgent coronary angiography for a cardiac cause, lung-protective ventilation with oxygen titrated to avoid hyperoxia, MAP at least 65, and do not prognosticate before 72 hours. ECPR is a selected-centre option for refractory arrest.

[1] [2] [3] [8]

Meet the patient

A 58-year-old man is wheeled into your ICU comatose after an out-of-hospital VF arrest — bystander CPR, three shocks, adrenaline 1 mg, amiodarone 300 mg, ROSC at 18 minutes. He is intubated, GCS 4, BP 88/50, temperature 37.2C, and the ECG shows anterior STEMI across V1 to V4.[1]

Three decisions. The temperature target after ROSC, the timing of coronary angiography, and the timing of neuroprognostication — each worked through below in trial order.[2][15]

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References33ShowHide
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  2. [2]Nolan JP, Sandroni C, Böttiger BW, et al. European Resuscitation Council and European Society of Intensive Care Medicine guidelines 2021: post-resuscitation care Intensive Care Med, 2021.PMID 33765189
  3. [3]Dankiewicz J, Cronberg T, Lilja G, et al. Hypothermia versus Normothermia after Out-of-Hospital Cardiac Arrest N Engl J Med, 2021.PMID 34133859
  4. [4]Nielsen N, Wetterslev J, Cronberg T, et al. Targeted temperature management at 33°C versus 36°C after cardiac arrest N Engl J Med, 2013.PMID 24237006
  5. [5]Lascarrou JB, Merdji H, Le Gouge A, et al. Targeted Temperature Management for Cardiac Arrest with Nonshockable Rhythm N Engl J Med, 2019.PMID 31577396
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  16. [16]Wyse DG, Waldo AL, DiMarco JP, et al. A comparison of rate control and rhythm control in patients with atrial fibrillation N Engl J Med, 2002.PMID 12466506
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  23. [23]Tomlinson DR, Cherian P, Betts TR, et al. Intravenous amiodarone for the pharmacological termination of haemodynamically-tolerated sustained ventricular tachycardia: is bolus dose amiodarone an appropriate first-line treatment? Emerg Med J, 2008.PMID 18156531
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  27. [27]Yokose M, Sangawa M, Shiomi H, et al. Initial Dose of Intravenous Atropine for Patients With Symptomatic Bradycardia - A Scoping Review Circ Rep, 2025.PMID 41216404
  28. [28]Tencer T, Waldauf P, Balik M Treatment of supraventricular arrhythmias in critical care patients with sepsis Front Cardiovasc Med, 2026.PMID 42244795
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