3 Cardiogenic Shock
Learn to recognize cardiogenic shock, interpret perfusion and hemodynamic findings, initiate cause-directed treatment, and escalate care when perfusion remains inadequate.
Recognizing impaired perfusion
is a critical reduction in the heart’s pumping ability that causes inadequate tissue perfusion. Low blood pressure is common, but hypotension alone does not establish shock. Assess for evidence of organ hypoperfusion and consider the full clinical picture.
Perfusion and congestion findings
Signs of impaired perfusion can include confusion, cool or mottled skin, weak pulses, falling urine output, rising lactate, and worsening kidney or liver function. These findings help distinguish shock from low blood pressure alone.
Pulmonary edema, jugular venous distension, and peripheral edema can signal congestion. A patient with chest discomfort, pallor, diaphoresis, blood pressure of 82 over 58 mm Hg, cool extremities, falling urine output, and crackles in both lungs has findings consistent with , hypoperfusion, and pulmonary congestion. Interpret these findings together rather than relying on blood pressure alone.
Interpreting hemodynamics
A pulmonary artery catheter example shows a of and a of . The low indicates reduced forward flow, while the elevated wedge pressure suggests increased left-sided filling pressure. Together, the findings fit a cardiogenic-shock pattern.
Hemodynamic measurements can support diagnosis and treatment decisions, but they must be interpreted alongside the patient’s examination and clinical trajectory. The measurements alone do not establish a different shock diagnosis.
Initial assessment and stabilization
Begin emergency stabilization and continuous reassessment while rapidly identifying the cause. The initial approach includes cardiac monitoring and intravenous access, assessment of oxygenation and perfusion, and urgent evaluation of the suspected cause.
Evaluation commonly includes a 12-lead ECG, laboratory assessment including lactate and cardiac biomarkers, chest imaging, and bedside echocardiography or point-of-care ultrasound when available. Do not delay ECG and imaging until laboratory results return or treat the blood pressure number alone.
Treating the underlying cause
Treatment should address the cause of shock. When acute myocardial infarction is driving , urgent assessment for is a central, time-critical intervention. Vasoactive medicines may support perfusion while definitive treatment is arranged, but they do not correct a coronary obstruction.
Supporting circulation with medicines
If hypotension and poor perfusion persist despite initial stabilization, norepinephrine is a reasonable preferred initial vasopressor. Dobutamine or milrinone may be considered for inotropic support to support cardiac output.
Treatment should be individualized rather than using the same medicine and dose for every patient. Reassess perfusion, congestion, adverse effects, and response closely; starting a vasopressor does not remove the need to monitor organ perfusion.
Using fluids cautiously
can involve high filling pressures and pulmonary congestion, so automatic large-volume fluid resuscitation may worsen edema. Avoid routine large-volume boluses; assess volume status and the shock pattern, and give fluid only when clinically indicated with close reassessment.
Fluid management depends on the individual’s hemodynamics and cause. Avoid both reflexive fluid loading and absolute rules that ignore the clinical context.
Reassessing and escalating care
Worsening perfusion requires prompt reassessment and escalation. Rising lactate, falling urine output, or persistent hypotension despite initial pharmacologic support are reasons to escalate urgently to a multidisciplinary shock team for hemodynamic reassessment.
Invasive hemodynamic monitoring may help clarify the shock pattern and guide therapy. If perfusion cannot be maintained with medical treatment alone, temporary mechanical circulatory support or transfer to an appropriate center may be considered.