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Cardiogenic Shock

Clinical Subject Page

Cardiogenic Shock

Cardiogenic shock is a life-threatening state of inadequate tissue perfusion caused by severe cardiac pump failure, resulting in reduced cardiac output despite adequate intravascular volume.

Also called

Cardiac Shock

ICD-10

R57.0

Specialty

Cardiology

Onset

Acute

Reviewed

June 2026

On This Page

Overview

Cardiogenic shock is a form of shock caused by failure of the heart to pump effectively, resulting in decreased cardiac output (CO), hypotension, and inadequate tissue perfusion. Pulmonary congestion and edema commonly occur because of increased pulmonary hydrostatic pressure.

Etiology & Risk Factors

The most common cause is myocardial infarction (MI).

Other causes include:

  • Arrhythmias
  • Heart failure
  • Cardiomyopathy
  • Myocarditis
  • Mechanical complications:
    • Ventricular septal defect
    • Ventricular rupture
  • Severe valvular disease:
    • Severe aortic regurgitation
    • Severe mitral regurgitation
  • Blunt cardiac trauma
  • Certain drugs (e.g., beta blockers, calcium channel blockers)

Pathophysiology

Underlying cardiac dysfunction leads to:

  • ↓ Cardiac contractility and/or ↓ stroke volume
  • ↓ Cardiac output
  •  

Systemic effects:

  • ↓ Blood pressure
  • Catecholamine release → vasoconstriction and increased myocardial oxygen demand
  • Activation of the renin-angiotensin-aldosterone system → further vasoconstriction and sodium/water retention
  • Blood shunting to vital organs → inadequate peripheral organ perfusion
  •  

Pulmonary effects:

  • Increased pulmonary hydrostatic pressure
  • Pulmonary edema

Clinical Presentation

Symptoms

  • Severe chest pain (if MI)
  • Dyspnea
  • Fatigue
  • Dizziness
  • Altered mental status
  • Oliguria

Signs

  • Hypotension
  • Cold, clammy skin
  • Tachycardia
  • Pulmonary edema
  • Cyanosis
  • Peripheral vasoconstriction

History Taking

Key Questions

  • Sudden chest pain?
  • Shortness of breath?
  • Previous heart attack?
  • History of heart failure?
  • Palpitations?
  • Syncope?
  • Recent myocarditis?
  • Known valvular disease?

Red Flags

  • Persistent hypotension
  • Altered consciousness
  • Chest pain
  • Pulmonary edema
  • Reduced urine output

Physical Examination

General

  • Pale, cold, clammy patient
  • Distressed appearance

Vital Signs

  • Hypotension (SBP <90 mmHg)
  • Tachycardia
  • Tachypnea
  • Low oxygen saturation

Cardiovascular

  • Weak, thready pulse
  • Elevated jugular venous pressure
  • S3 gallop
  • New systolic murmur (mechanical complications)
  • Cool extremities

Respiratory

  • Bibasal crackles
  • Pulmonary edema

Peripheral

  • Delayed capillary refill
  • Cyanosis
  • Reduced urine output

Investigations

Laboratory

  • CBC
  • Electrolytes
  • Renal & liver function
  • Troponin
  • BNP/NT-proBNP
  • Arterial blood gas
  • Serum lactate
  • Coagulation profile

ECG

  • Acute MI changes
  • Arrhythmias

Imaging

  • Echocardiography (first-line)
  • Chest X-ray
  • Coronary angiography (if ACS suspected)

Hemodynamic Monitoring

  • Arterial line
  • Central venous access
  • Pulmonary artery catheter (selected patients)

Diagnosis

Diagnosis is based on:

  • Clinical evidence of shock
  • SBP <90 mmHg (or need for vasopressors)
  • Signs of end-organ hypoperfusion
  • Elevated lactate
  • Echocardiographic evidence of severe cardiac dysfunction
  • Identification of the underlying cardiac cause
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Related Topics

Management

Initial Stabilization

  • Airway and oxygenation
  • Continuous cardiac monitoring
  • IV access
  • Treat reversible causes

Medications

  • Vasopressors (Norepinephrine first-line)
  • Inotropes (Dobutamine)
  • Diuretics (if pulmonary congestion and adequate BP)
  • Antiplatelet and anticoagulation (ACS)
  • Vasodilators only if hemodynamically stable

Definitive Treatment

  • Urgent PCI or CABG for acute MI
  • Surgical repair of mechanical complications
  • Treat arrhythmias
  • Valve intervention if indicated

Mechanical Circulatory Support

  • Intra-aortic balloon pump (selected patients)
  • Impella
  • VA-ECMO

Complications

  • Multi-organ failure
  • Acute kidney injury
  • Pulmonary edema
  • Life-threatening arrhythmias
  • Cardiac arrest
  • Death

Prognosis

  • Cardiogenic shock has a high mortality despite treatment.
  • Early diagnosis and rapid revascularization significantly improve survival.
  • Prognosis depends on the underlying cause and response to therapy.

Key Points / Clinical Pearls

  • Acute myocardial infarction is the most common cause.
  • Hypotension with end-organ hypoperfusion defines cardiogenic shock.
  • Echocardiography is the first-line imaging modality.
  • Urgent coronary revascularization is lifesaving in MI-related shock.
  • Norepinephrine is the preferred initial vasopressor.
  • Early recognition and multidisciplinary management improve outcomes.