Nursing care
Cardiogenic Shock nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Cardiogenic shock is pump failure with adequate or excess volume already present, so the nursing priority is supporting contractility, not giving fluids. Expect hypotension, cold clammy skin, weak pulses, and pulmonary crackles together. Interventions centre on inotropes, afterload reduction, and oxygenation, the reverse of hypovolaemic shock management.
What it is and why it happens
Cardiogenic shock occurs when the heart itself fails as a pump despite adequate circulating volume. The most common cause is a large myocardial infarction that destroys enough functional muscle to drop cardiac output below what the body needs. Other causes include severe dysrhythmias, acute valve failure, myocarditis, and end-stage cardiomyopathy.
The defining feature is that the tank is full but the pump cannot move it. This is the opposite mechanical problem to hypovolaemic shock, where the tank itself is empty. That single distinction drives almost every difference in management: fluids that would rescue a hypovolaemic patient overload a cardiogenic one, backing blood up into the lungs and worsening the failure the patient is already experiencing.
How it presents — what you will actually see
Expect hypotension with a narrow pulse pressure, tachycardia as a compensatory response, and weak or thready peripheral pulses. Skin is cold, pale, and clammy because peripheral vasoconstriction is diverting blood to core organs, a finding that immediately distinguishes cardiogenic shock from the warm, flushed skin of early septic shock.
Because the left ventricle is failing, fluid backs up into the pulmonary circulation, producing crackles, dyspnoea, and often frank pulmonary oedema with pink frothy sputum in severe cases. Jugular venous distension and peripheral oedema may appear if right-sided failure or biventricular involvement is present. Mentation declines as cerebral perfusion drops, and urine output falls as renal perfusion follows the same trend. The combination of cold skin, low output, and wet lungs together is the pattern to recognise, not any single finding in isolation.
Nursing assessment priorities
Continuous cardiac monitoring comes first, since dysrhythmias are both a cause and a consequence of the shock state and can be corrected. Assess blood pressure, heart rate, and peripheral perfusion together rather than in isolation, because a normal-looking blood pressure can mask a critically low cardiac output in a patient who was previously hypertensive.
Auscultate lungs frequently for new or worsening crackles, since this tells you whether the current fluid balance is being tolerated. Track urine output hourly as a marker of renal perfusion, and monitor mental status closely, since confusion or lethargy in this population often signals worsening cerebral perfusion before vital signs fully deteriorate. Review haemodynamic data where available, including cardiac index and pulmonary capillary wedge pressure, since these confirm the low-output, high-filling-pressure picture that defines the condition.
Interventions and what to do first
The first priority is optimising oxygenation and supporting the failing pump, not giving fluid boluses. Administer supplemental oxygen or prepare for non-invasive or invasive ventilation if respiratory failure is progressing. Inotropic support, such as dobutamine or milrinone, improves contractility and cardiac output, while vasopressors like norepinephrine may be added if perfusion pressure remains inadequate.
Afterload reduction, when blood pressure tolerates it, reduces the workload on the failing ventricle and can improve forward flow. In severe or refractory cases, mechanical circulatory support such as an intra-aortic balloon pump or a percutaneous ventricular assist device may be used to offload the heart while definitive treatment, such as emergency revascularisation for an infarct-related cause, is arranged. Fluids are given cautiously if at all, and only when a clinical picture genuinely suggests concurrent volume depletion, since routine bolusing in this population worsens pulmonary congestion rather than improving output.
Complications to watch for
Watch for worsening pulmonary oedema, which presents as escalating dyspnoea, falling oxygen saturation, and increasing crackles, and signals that the current fluid and inotropic strategy needs urgent reassessment. Dysrhythmias, including ventricular tachycardia and fibrillation, are a leading cause of death in this population and require continuous monitoring with resuscitation equipment immediately available.
Multi-organ hypoperfusion is a second major risk: acute kidney injury from reduced renal perfusion, hepatic dysfunction from reduced splanchnic flow, and lactic acidosis from inadequate tissue oxygenation all develop as the shock state persists. Any device used for mechanical support carries its own complications, including limb ischaemia with an intra-aortic balloon pump and bleeding or haemolysis with a ventricular assist device, and the insertion site and distal circulation require frequent checks.
Patient teaching before discharge
Teaching depends heavily on the underlying cause and whether the patient is leaving with a new diagnosis of heart failure, a revascularised infarct, or a mechanical support device, so individualise the content rather than applying a generic shock discharge script. For most patients, daily weight monitoring is central, since a gain of more than two pounds in a day or five pounds in a week signals fluid retention that needs prompt attention.
Review the discharge medication regimen carefully, particularly any new inotrope, diuretic, beta-blocker, or ACE inhibitor, and explain why doses may be titrated slowly over subsequent visits rather than started at full strength. Teach the patient to recognise early warning signs, including increasing shortness of breath, orthopnoea, swelling, and fatigue, and to contact their care team before these progress to a crisis. Reinforce activity pacing and sodium restriction as ongoing management tools, and confirm follow-up with cardiology is scheduled before the patient leaves the unit.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our cardiovascular practice questions are the closest set to what this page covers.
Common questions
Why do fluids make cardiogenic shock worse instead of better?
In cardiogenic shock, circulating volume is already adequate or excessive; the problem is that the heart cannot pump what is already there. Adding more fluid increases the volume the failing ventricle must handle, which backs up into the pulmonary circulation and worsens pulmonary oedema rather than improving perfusion.
How do you tell cardiogenic shock apart from hypovolaemic shock at the bedside?
Both present with hypotension and tachycardia, but cardiogenic shock typically shows jugular venous distension, pulmonary crackles, and evidence of adequate or high filling pressures, while hypovolaemic shock shows flat neck veins, clear lungs, and low filling pressures. The skin is cold and clammy in both, which is why the lung and neck vein findings are the key differentiators.
What is the most common cause of cardiogenic shock?
Acute myocardial infarction, particularly one large enough to destroy a significant portion of left ventricular muscle mass, is the leading cause. Other causes include severe dysrhythmias, acute valvular failure, and advanced cardiomyopathy.
What is the role of an intra-aortic balloon pump in cardiogenic shock?
It inflates during diastole to improve coronary perfusion and deflates just before systole to reduce the resistance the left ventricle must pump against. This combination increases coronary blood flow while reducing cardiac workload, buying time for definitive treatment such as revascularisation.
Why is hourly urine output monitored so closely in cardiogenic shock?
Urine output is a sensitive marker of renal perfusion, which in turn reflects overall cardiac output. A falling hourly output often signals worsening pump function before blood pressure itself drops, making it an early warning sign rather than a late one.
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