ICU · Cardiovascular
Cardiogenic shock and mechanical circulatory support
Also known as Cardiogenic shock · Mechanical circulatory support (MCS) · Intra-aortic balloon pump (IABP) · Impella · VA-ECMO · Counterpulsation · SCAI shock staging
Cardiogenic shock is a life-threatening state of end-organ hypoperfusion due to cardiac pump failure, with short-term mortality of 40-50%. The SCAI classification (Stages A-E) guides severity assessment. Management escalates from pharmacological support (noradrenaline first-line vasopressor, dobutamine/milrinone as inotropes) through to mechanical circulatory support: IABP (no routine benefit per IABP-SHOCK II), Impella microaxial flow pump (lower 180-day mortality in STEMI-related shock per DanGer Shock, at the cost of more adverse events), and VA-ECMO (no routine benefit per ECLS-SHOCK). The Impella actively unloads the left ventricle; the combination with VA-ECMO (ECPELLA) addresses both systemic flow and ventricular unloading.
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- VA-ECMO does NOT unload the LV — retrograde flow increases afterload and can worsen LV distension and pulmonary oedema; add an Impella (ECPELLA) or venting strategy if the LV is dilating
- IABP is contraindicated in aortic regurgitation (diastolic inflation worsens regurgitation) and aortic dissection
- IABP-SHOCK II (NEJM 2012): no mortality benefit of routine IABP in ACS cardiogenic shock — use selectively, not routinely
- Define the MCS goal early: bridge to recovery, decision, transplant, or LVAD. MCS without a defined endpoint accumulates complications
- CULPRIT-SHOCK (NEJM 2017): culprit-only PCI is superior to immediate multivessel PCI in cardiogenic shock
- Dopamine causes significantly more arrhythmias than noradrenaline in shock (SOAP II trial, NEJM 2010)
Meet the patient — the pump that will not push
A 58-year-old smoker is two hours into a massive anterior STEMI when he turns cold, clammy, and confused — systolic 82, lactate 3.8, passing almost no urine, with crackles creeping to the apices. The echo shows an ejection fraction around 25 per cent and a globally sluggish left ventricle with no mechanical complication. The artery is open; the muscle is not.[1][2]
The two questions that decide his next hour are the two that decide every cardiogenic shock: what is failing — the left ventricle, the right ventricle, or a mechanical complication? and what will restore forward flow — an inotrope, a mechanical pump, or the catheter lab? Sort those two and the management ladder below is just the execution.[1]
References20ShowHide
- [1]Lüsebrink E, Binzenhöfer L, Adamo M, et al. Cardiogenic shock Lancet, 2024.PMID 39550175
- [2]Samsky MD, Morrow DA, Proudfoot AG, et al. Cardiogenic Shock After Acute Myocardial Infarction: A Review JAMA, 2021.PMID 34751704
- [3]Baran DA, Grines CL, Bailey S, et al. SCAI clinical expert consensus statement on the classification of cardiogenic shock: This document was endorsed by the American College of Cardiology (ACC), the American Heart Association (AHA), the Society of Critical Care Medicine (SCCM), and the Society of Thoracic Surgeons (STS) in April 2019 Catheter Cardiovasc Interv, 2019.PMID 31104355
- [4]Thiele H, Zeymer U, Neumann FJ, et al. Intraaortic balloon support for myocardial infarction with cardiogenic shock N Engl J Med, 2012.PMID 22920912
- [5]Thiele H, Akin I, Sandri M, et al. PCI Strategies in Patients with Acute Myocardial Infarction and Cardiogenic Shock N Engl J Med, 2017.PMID 29083953
- [6]Hochman JS, Sleeper LA, Webb JG, et al. Early revascularization in acute myocardial infarction complicated by cardiogenic shock. SHOCK Investigators. Should We Emergently Revascularize Occluded Coronaries for Cardiogenic Shock N Engl J Med, 1999.PMID 10460813
- [7]De Backer D, Biston P, Devriendt J, et al. Comparison of dopamine and norepinephrine in the treatment of shock N Engl J Med, 2010.PMID 20200382
- [8]Thiele H, Zeymer U, Akin I, et al. Extracorporeal Life Support in Infarct-Related Cardiogenic Shock N Engl J Med, 2023.PMID 37634145
- [9]Hu K, Mathew R Inotrope and vasopressor use in cardiogenic shock: what, when and why? Curr Opin Crit Care, 2022.PMID 35792520
- [10]Sarma D, Jentzer JC, et al. Cardiogenic Shock: Pathogenesis, Classification, and Management Crit Care Clin, 2024.PMID 37973356
- [11]Nakata J, Yamamoto T, Saku K, et al. Mechanical circulatory support in cardiogenic shock J Intensive Care, 2023.PMID 38115065
- [12]Masiero G, Arturi F, et al. Mechanical Circulatory Support with Impella: Principles, Evidence, and Daily Practice J Clin Med, 2024.PMID 39200728
- [13]Kislitsina ON, Rich JD, et al. Shock - Classification and Pathophysiological Principles of Therapeutics Curr Cardiol Rev, 2019.PMID 30543176
- [14]Gong FF, Vaitenas I, et al. Mechanical Complications of Acute Myocardial Infarction: A Review JAMA Cardiol, 2021.PMID 33295949
- [15]Kosaraju A, Pendela VS, Hai O Cardiogenic Shock StatPearls [Internet], 2026.PMID 29489148
- [16]Jentzer JC, van Diepen S, Barsness GW, et al. Cardiogenic Shock Classification to Predict Mortality in the Cardiac Intensive Care Unit J Am Coll Cardiol, 2019.PMID 31548097
- [17]Schaubroeck H, Rossberg M, Thiele H, et al. ICU management of cardiogenic shock before mechanical support Curr Opin Crit Care, 2024.PMID 38872375
- [18]Lim HS, González-Costello J, Belohlavek J, et al. Hemodynamic management of cardiogenic shock in the intensive care unit J Heart Lung Transplant, 2024.PMID 38518863
- [19]Møller JE, Engstrøm T, Jensen LO, et al. Microaxial Flow Pump or Standard Care in Infarct-Related Cardiogenic Shock N Engl J Med, 2024.PMID 38587239
- [20]Levy B, Clere-Jehl R, Legras A, et al. Epinephrine Versus Norepinephrine for Cardiogenic Shock After Acute Myocardial Infarction J Am Coll Cardiol, 2018.PMID 29976291