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CardiologyCondition·Updated Jun 3, 2026·v1

Cardiogenic Shock

Cardiogenic shock is a high-mortality syndrome of cardiac-driven hypoperfusion. Management centers on early revascularization, SCAI staging, and a 'Shock Team' approach utilizing invasive hemodynamics and selective mechanical support.

High Evidence191 references·8,251 words·34 min read·v1
CardiologyCritical CareEmergency MedicineMechanical Circulatory Support

Quick Reference

RxDrug of choice[[Norepinephrine]] (vasopressor); [[Dobutamine]] or [[Milrinone]] (inotrope)
AltAlternatives[[Vasopressin]] (for mixed/vasoplegic shock); [[Levosimendan]] (emerging for ECMO weaning)
Avoid[[Dopamine]] (increased arrhythmia/mortality); [[Epinephrine]] (metabolic distress/refractory shock)
DxTest of choiceTransthoracic Echocardiogram (initial); Pulmonary Artery Catheter (gold standard for phenotyping)
ScKey scoreSCAI Shock Staging (A-E)
When to referImmediate transfer to a Level 1 Shock Center for any patient in SCAI Stage C or higher.
Cardiogenic shock is a medical emergency requiring rapid revascularization, invasive hemodynamic-guided therapy, and early consideration of mechanical support to break the downward spiral of hypoperfusion.
Cardiogenic shock (CS) is a high-acuity clinical syndrome characterized by primary cardiac failure leading to inadequate systemic perfusion and subsequent multiorgan dysfunction. Historically defined by a systolic blood pressure < 90 mmHg, modern management recognizes a spectrum of severity ranging from compensated states (SCAI Stage B) to refractory circulatory collapse (SCAI Stage E). Despite the universal adoption of early revascularization following the landmark SHOCK trial, in-hospital mortality remains high at 40–50%. Management has recently shifted toward early invasive hemodynamic phenotyping using [[pulmonary artery catheterization]], the use of multidisciplinary "Shock Teams," and the selective application of temporary mechanical circulatory support (tMCS), such as microaxial flow pumps, which have recently shown a survival benefit in STEMI-related shock (DanGer Shock trial).

Overview and Recommendations

Background

  • Cardiogenic shock (CS) represents the extreme end of the acute heart failure spectrum, where a primary cardiac insult—most commonly (AMI)—triggers a self-perpetuating downward spiral of reduced cardiac output, systemic hypotension, and coronary hypoperfusion.
  • The Society for Cardiovascular Angiography and Interventions (SCAI) staging system (Stages A–E) has replaced binary definitions, providing a dynamic framework that correlates with mortality risk, which ranges from ~3% in Stage A (At Risk) to >67% in Stage E (Extremis).
  • Ischemic etiologies (AMI-CS) account for the majority of cases, but heart failure-related shock (HF-CS) is increasing in prevalence; notably, the presence of concomitant right ventricular failure occurs in ~11% of patients and independently worsens prognosis across all stages.
  • Pathophysiology involves not only mechanical pump failure but also a systemic inflammatory response syndrome (SIRS) that can lead to a "mixed shock" phenotype, where low systemic vascular resistance (SVR) complicates the classic "cold and wet" presentation.
  • The paradigm of management has evolved from the 1999 SHOCK trial (establishing early revascularization) to the 2024 DanGer Shock trial, which provided the first randomized evidence that microaxial flow pumps ( CP) can reduce 180-day mortality in STEMI-related shock (NNT = 8).

Evaluation

  • Suspect cardiogenic shock in any patient with hypotension (SBP < 90 mmHg or MAP < 65 mmHg) who also exhibits signs of end-organ hypoperfusion, such as altered mental status, cool/mottled extremities, or oliguria (< 0.5 mL/kg/hr).
  • Perform an immediate bedside (POCUS) to assess left and right ventricular function, rule out mechanical complications (e.g., , acute ), and identify mimics like cardiac tamponade.
  • Order serial serum levels to quantify the depth of shock; a lactate > 2.0 mmol/L is a hallmark of Stage C shock, and a failure to clear lactate by > 10% within 6 hours of initiation of therapy is a strong predictor of 30-day mortality.
  • Assess for a narrow pulse pressure (< 25 mmHg), which often precedes overt hypotension in "normotensive" shock variants where high systemic vascular resistance temporarily masks low cardiac output.
  • Initiate invasive hemodynamic monitoring with a (PAC) to calculate the Cardiac Power Output (CPO = [MAP × CO] / 451); a CPO < 0.6 Watts is the most potent hemodynamic predictor of mortality in CS.
  • Evaluate right ventricular (RV) reserve using the Pulmonary Artery Pulsatility Index (PAPi = [sPAP - dPAP] / CVP); a PAPi < 1.0 suggests significant RV dysfunction that may require specific right-sided support.
  • Screen for mechanical complications of MI if a new holosystolic murmur is heard, as these patients require urgent surgical consultation and often benefit from immediate intra-aortic balloon pump (IABP) stabilization.
  • Differentiate between "cold and wet" (classic CS), "cold and dry" (hypovolemic CS requiring fluid challenge), and "warm and wet" (vasodilatory/mixed shock) phenotypes to tailor vasoactive therapy.

Management

  • Activate a multidisciplinary "Shock Team" (cardiology, cardiac surgery, critical care) immediately to coordinate rapid revascularization and potential mechanical support escalation.
  • Prioritize early revascularization in AMI-CS with a target door-to-catheterization (D2C) time of ≤ 39 minutes; use transradial access when possible, as it is associated with a > 50% reduction in mortality compared to femoral access.
  • Initiate (0.05–0.5 mcg/kg/min) as the first-line vasopressor to maintain a MAP of 65–70 mmHg; avoid due to a higher risk of arrhythmias and mortality.
  • Add an inotrope, such as (2.5–5 mcg/kg/min) or (0.125–0.25 mcg/kg/min), if signs of low cardiac output persist despite adequate MAP; milrinone may be preferred in patients on chronic beta-blockers.
  • Avoid as a first-line agent, as it is associated with increased rates of refractory shock and transient lactic acidosis (NNH = 4 for refractory shock).
  • Consider early insertion of a microaxial flow pump ( CP) in patients with STEMI-related shock (SCAI Stage C or D) to improve 180-day survival, while monitoring closely for major bleeding (BARC 3-5) and hemolysis.
  • Reserve venoarterial extracorporeal membrane oxygenation ( ) for patients in refractory shock (SCAI Stage E) or those with combined respiratory failure, ensuring proactive left ventricular unloading (e.g., with an IABP or Impella) to prevent pulmonary edema.
  • Perform culprit-only percutaneous coronary intervention (PCI) in the acute phase of shock for patients with multivessel disease, as immediate multivessel PCI increases the risk of death or renal failure (NNT = 11 to avoid these by choosing culprit-only).
  • Monitor renal function closely and initiate continuous renal replacement therapy ( ) early if volume overload or metabolic acidosis cannot be managed medically, especially in patients on tMCS.
  • Transition to guideline-directed medical therapy ( ), including beta-blockers and ACE inhibitors, only after the patient is weaned from all inotropic/vasopressor support and demonstrates hemodynamic stability.

Board Review — High Yield

  • SCAI Stage C — 'Classic' shock: hypotension + hypoperfusion requiring inotropes or MCS.
  • Cardiac Power Output (CPO) — (MAP x CO) / 451; < 0.6 Watts is the strongest predictor of mortality.
  • DanGer Shock Trial — First RCT to show mortality benefit for Impella CP in STEMI-CS (180-day mortality reduction).
  • CULPRIT-SHOCK Trial — Culprit-only PCI is superior to immediate multivessel PCI in the acute shock setting.
  • IABP-SHOCK II — Routine use of IABP in AMI-CS does not improve 30-day mortality.
  • PAPi — (sPAP - dPAP) / CVP; < 1.0 indicates right ventricular failure.
  • Norepinephrine vs Dopamine — Norepinephrine is superior due to fewer arrhythmic events and lower mortality in CS.
  • Mechanical Complications — Suspect VSD or papillary muscle rupture if a new murmur develops; IABP is indicated here.

Deep Dive — Evidence Details

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