How does cardiogenic shock differ from other types of shock?

Cardiogenic shock arises from the heart's own pump failure, producing low cardiac output despite adequate or high filling pressures, in contrast to hypovolaemic, distributive, or obstructive shock, where the heart itself is not initially the limiting problem.

Why is cardiogenic shock described as a spiral?

Because low cardiac output reduces coronary and systemic perfusion, which worsens myocardial ischaemia and further lowers output, creating a self-reinforcing cycle that tends to deepen unless interrupted.

Cardiogenic Shock

Cardiogenic shock is the state in which the heart's pumping failure is so severe that the circulation can no longer deliver adequate oxygen to the tissues despite sufficient intravascular volume. It is the extreme end of the cardiac pump-function spectrum, where low cardiac output meets a vicious cycle of falling perfusion, ischaemia, and further pump failure. Its physiology connects directly to the contractility, heart-failure, and valvular topics in this area.

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Definition

Cardiogenic shock is a state of critical end-organ hypoperfusion caused by primary cardiac pump failure, characterised by sustained hypotension and a low cardiac output in the presence of adequate or elevated filling pressures.

Scope

This entry covers the pathophysiology of cardiogenic shock: the haemodynamic definition of low output with end-organ hypoperfusion, the downward spiral that perpetuates it, its principal causes, and the conceptual role of mechanical circulatory support. It is a reference and educational topic and does not provide dosing, resuscitation protocols, or individualised management.

Core questions

What haemodynamic profile distinguishes cardiogenic shock from other forms of shock?
How does the self-reinforcing spiral of hypoperfusion and ischaemia perpetuate the state?
Which cardiac insults most commonly precipitate it?
What is the physiological rationale for mechanical circulatory support?

Key concepts

Low cardiac output state
End-organ hypoperfusion
Elevated filling pressures
Systemic vascular resistance and afterload
Mechanical circulatory support
Multi-organ dysfunction

Key theories

The cardiogenic shock spiral: A self-perpetuating cycle in which falling cardiac output lowers coronary and systemic perfusion, worsening myocardial ischaemia and dysfunction, which further reduces output; compensatory vasoconstriction raises afterload and can deepen the spiral unless interrupted.

Mechanisms

A severe cardiac insult — most often extensive myocardial infarction, but also acute valvular failure, fulminant myocarditis, or decompensated chronic heart failure — abruptly reduces stroke volume and cardiac output. Falling output lowers systemic and coronary perfusion, which aggravates myocardial ischaemia and further depresses contractility, establishing a downward spiral. Compensatory sympathetic activation raises systemic vascular resistance and heart rate, but the increased afterload and oxygen demand can deepen the injury; meanwhile elevated filling pressures produce pulmonary congestion. Sustained hypoperfusion injures the kidneys, liver, and other organs, and a systemic inflammatory response may further lower vascular tone, producing a mixed picture. Mechanical circulatory support is conceived as a means of unloading the failing ventricle and maintaining perfusion to interrupt this spiral.

Clinical relevance

Cardiogenic shock is a defining emergency in cardiac critical care and a context in which cardiothoracic teams may consider mechanical circulatory support; its physiology explains why restoring perfusion and unloading the ventricle are the organising goals. This entry describes mechanism and rationale for reference and is not a protocol for resuscitation or device selection in an individual patient.

Epidemiology

Acute myocardial infarction is the most frequent cause of cardiogenic shock, and the syndrome carries high short-term mortality despite reperfusion and support; trials such as those by Thiele and colleagues have shaped understanding of revascularisation strategy in this setting.

Evidence & guidelines

The mechanistic account here is supported by reviews of heart-failure physiology and by expert panel and trial literature on revascularisation and venoarterial ECMO; specific management algorithms are set out in critical-care and cardiology guidance beyond this entry.

History

Cardiogenic shock was long regarded as an almost uniformly fatal complication of myocardial infarction. The advent of reperfusion, intensive haemodynamic monitoring, and mechanical circulatory support in the late twentieth and early twenty-first centuries reframed it as a state amenable to physiological intervention, and randomised trials clarified which strategies alter its course.

Debates

What is the role of mechanical circulatory support?: Whether, when, and which devices improve outcomes in cardiogenic shock remains contested, as the physiological appeal of unloading and perfusion must be weighed against device-related risks and uncertain trial evidence.

Key figures

Holger Thiele
Eugene Braunwald
Judith Hochman

Seminal works

thiele-2017
guglin-2019

Frequently asked questions

How does cardiogenic shock differ from other types of shock?: Cardiogenic shock arises from the heart's own pump failure, producing low cardiac output despite adequate or high filling pressures, in contrast to hypovolaemic, distributive, or obstructive shock, where the heart itself is not initially the limiting problem.
Why is cardiogenic shock described as a spiral?: Because low cardiac output reduces coronary and systemic perfusion, which worsens myocardial ischaemia and further lowers output, creating a self-reinforcing cycle that tends to deepen unless interrupted.