Skip to main content

Health condition · Clinically reviewed

Cardiogenic shock, when the heart can no longer keep up.

A life-threatening emergency where cardiac output falls too low to perfuse the body. Early recognition, urgent revascularisation and a specialist shock team save lives.

A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against ESC, NICE, BCS and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including shock teams, Impella, VA-ECMO and specialist cardiogenic shock centres.

Key facts

Cardiogenic shock at a glance.

The essentials, in plain English. What it is, why it happens, how it’s graded and how UK teams treat it in 2026.

  • What it is

    A life-threatening state where the heart cannot pump enough blood to meet the body’s needs, causing tissue hypoperfusion and end-organ failure.

  • How serious

    Mortality remains 40 to 50 per cent despite modern management. Early recognition and shock team activation save lives.

  • Definition

    Systolic BP under 90 mmHg for more than 30 minutes (or needing inotropes to keep it above 90) with signs of hypoperfusion.

  • Commonest cause

    Acute myocardial infarction accounts for around 80 per cent of cases, especially anterior, right ventricular or late-presenting MI.

  • Classification

    The SCAI scheme grades severity from stage A (At risk) through B, C, D to E (Extremis) to guide escalation.

  • First move

    Urgent revascularisation for ACS-driven shock and early activation of a specialist shock team with mechanical support on standby.

Why this guide matters

Time-critical, team-based, protocol-driven.

Cardiogenic shock still kills nearly half the people it strikes. The three ideas below now shape every UK shock team.

  • Revascularise fast

    For MI-related shock, primary PCI within 60 minutes of arrival is still the single biggest lever on survival.

  • Escalate mechanical support

    IABP, Impella and VA-ECMO buy time while the heart recovers or a definitive plan is made. Choice is team-based.

  • Move to a shock centre

    The sickest patients do better in specialist centres with 24/7 cath lab, cardiac surgery and ECMO on site.

How shock is assessed

From the front door to a definitive plan.

The steps a UK emergency and cardiology team will normally follow, in order, so you know what to expect and why.

  1. 01

    Recognising

    Urgent ABCDE and access

    Airway, breathing, circulation, IV access, urgent bloods and continuous monitoring in a resus setting.

  2. 02

    Recognising

    12-lead ECG straight away

    Looking for STEMI, NSTEMI, tachyarrhythmia, bradyarrhythmia or electrical storm as the trigger.

  3. 03

    Recognising

    Bedside echocardiogram

    Assesses LV and RV function, valves, tamponade and mechanical complications like papillary muscle rupture or VSD.

  4. 04

    Investigating

    Bloods, troponin and lactate

    Troponin, BNP, lactate, blood gases, FBC, U and Es, LFTs, coagulation and drug levels frame the picture.

  5. 05

    Investigating

    Urgent catheter lab if ACS

    Primary PCI for STEMI or refractory NSTEMI. The SHOCK trial supports early revascularisation with a door-to-balloon under 60 minutes.

  6. 06

    Escalating

    CT chest when indicated

    To exclude aortic dissection, massive pulmonary embolism or a large pericardial collection when the picture isn’t ischaemic.

  7. 07

    Escalating

    Shock team and PA catheter

    A pulmonary artery catheter (Swan-Ganz) can guide haemodynamics and LVAD candidacy when the shock team asks for it.

Typical timeline: first assessment to a definitive intervention in minutes to hours, not days.

Presentation

What cardiogenic shock actually looks like.

The clinical picture is a pale, cold, breathless, confused patient with a low blood pressure and a rising lactate. The features below tell that story piece by piece.

  • Hypotension

    Systolic BP persistently under 90 mmHg, or falling despite fluids and inotropes.

  • Cool, mottled peripheries

    Skin that feels cold and clammy with a mottled or waxy pattern signals poor tissue perfusion.

  • Oliguria

    Urine output below 30 mL per hour is a sensitive marker of low cardiac output and renal hypoperfusion.

  • Altered mental status

    Confusion, agitation or drowsiness reflects cerebral hypoperfusion and rising lactate.

  • Tachycardia and tachypnoea

    The body’s attempt to compensate for a falling cardiac output and rising acidosis.

  • Pulmonary oedema and raised JVP

    Crackles, frothy sputum, hypoxia and a visibly raised jugular venous pressure point to LV failure.

  • Chest pain and prior heart disease

    Ischaemic chest pain, a known previous MI or heart failure raises the pretest probability sharply.

  • Red flag - lactate over 2

    A rising lactate with cool, oliguric shock is a hard trigger to call the shock team and prepare mechanical support.

Treatment

How cardiogenic shock is treated in the UK.

Urgent revascularisation, careful use of inotropes and vasopressors, mechanical circulatory support when needed and a shock team pulling every lever in parallel.

  • Urgent revascularisation

    Primary PCI, or CABG when anatomy demands, is the single most important intervention for MI-related cardiogenic shock.

  • Inotropes

    Dobutamine or milrinone to support contractility. Adrenaline is reserved for arrest or refractory shock; dopamine is avoided after SOAP II.

  • Vasopressors

    Noradrenaline first-line for hypotension, with vasopressin or adrenaline added when perfusion pressure won’t hold.

  • Diuretics and vasodilators

    Loop diuretics and nitrates for heart failure with adequate perfusion pressure and pulmonary congestion.

  • Intra-aortic balloon pump

    IABP reduces afterload and improves coronary perfusion. Evidence is mixed (IABP-SHOCK II) but still used in selected cases.

  • Impella percutaneous LVAD

    Impella 2.5, CP or 5.5 provides direct LV unloading and is increasingly first-line for post-MI shock and high-risk PCI.

  • VA-ECMO

    Veno-arterial ECMO supports both heart and lungs. Reserved for refractory or biventricular shock at specialist ECMO centres.

  • Durable LVAD or transplant

    HeartMate 3 as bridge to transplant, recovery or destination therapy. Heart transplant remains the ultimate option in selected patients.

What this guide is based on

The sources behind every claim on this page.

UK and European guidance and landmark trials, current at the time of last review.

Key references

Guidelines and trials we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your cardiology, intensive care or emergency team knows the case and can tell you which parts apply to you. If in doubt, dial 999.

  • European Society of Cardiology (ESC). Guidelines on acute and chronic heart failure and on acute coronary syndromes.

  • NICE. Acute coronary syndromes (NG185) and Chronic heart failure in adults (NG106).

  • British Cardiovascular Society (BCS). Position statements on cardiogenic shock networks and mechanical circulatory support.

  • SHOCK, IABP-SHOCK II, SOAP II and ECLS-SHOCK trials informing current UK practice.

Red flags

When to call 999 and escalate at once.

Cardiogenic shock is a medical emergency. These features should trigger immediate specialist input, the shock team and often the cath lab.

  • SBP under 90 with hypoperfusion

    Sustained hypotension with cool skin, oliguria, confusion or rising lactate is cardiogenic shock until proven otherwise.

  • Suspected STEMI

    ST elevation with shock is a hard call for the catheter lab. Every minute of delay costs myocardium and life.

  • Mechanical complications of MI

    A new pansystolic murmur, sudden pulmonary oedema or tamponade after MI suggests papillary muscle rupture, VSD or free wall rupture. Surgical emergency.

  • Cardiac tamponade

    Muffled heart sounds, raised JVP, hypotension and a pericardial effusion on echo needs urgent pericardiocentesis. See our pericardial effusion guide.

  • Aortic dissection

    Tearing chest or back pain, unequal pulses and a widened mediastinum need urgent CT aorta and cardiothoracic input, not thrombolysis.

  • Massive pulmonary embolism

    Sudden hypoxia, right heart strain on echo and shock demands urgent thrombolysis or embolectomy.

  • Electrical storm

    Recurrent VT or VF driving shock needs advanced life support, antiarrhythmics, sedation and often mechanical circulatory support.

  • Toxin-related shock

    Beta-blocker, calcium channel blocker, digoxin or cocaine toxicity has specific antidotes and needs early toxicology input.

  • Sepsis with cardiac dysfunction

    Septic cardiomyopathy can mimic or coexist with cardiogenic shock. Source control and antibiotics run in parallel.

Life after shock

Rebuilding, at your own pace.

Surviving cardiogenic shock is the start of a longer journey. Cardiac rehab, specialist heart failure clinics and honest conversations shape the next chapter.

A quiet reminder

Ask about a specialist heart failure clinic.

Multidisciplinary follow-up after shock reduces readmission and death. If you haven’t been referred, ask.

  1. 01 Recovery

    A slow climb back

    Recovery from cardiogenic shock takes weeks to months. Fatigue, deconditioning and mood changes are the rule, not the exception.

  2. 02 Rehab

    Cardiac rehabilitation matters

    A structured cardiac rehab programme rebuilds fitness, confidence and heart function and is a firm UK recommendation after shock.

  3. 03 Devices

    ICDs and specialist follow-up

    Some survivors need an implantable defibrillator or a durable LVAD. Follow-up sits in a specialist heart failure clinic.

  4. 04 Planning

    Advance care planning

    Honest conversations about future admissions, resuscitation and quality of life are part of good post-shock care.

Frequently asked

Everything we get asked about cardiogenic shock.

Quick answers on causes, SCAI stages, mechanical support and where UK care happens.

  • What is cardiogenic shock?

    Cardiogenic shock is a life-threatening state where the heart cannot pump enough blood to meet the body’s needs. It causes low blood pressure, poor tissue perfusion and end-organ failure. Mortality remains around 40 to 50 per cent despite modern treatment.

  • What causes cardiogenic shock?

    The most common cause is acute myocardial infarction, particularly anterior, right ventricular or late-presenting MI. Other causes include decompensated chronic heart failure, myocarditis, valvular emergencies, arrhythmias, tamponade, massive pulmonary embolism, drug toxicity and sepsis-induced cardiomyopathy.

  • How is it diagnosed?

    Diagnosis rests on a systolic blood pressure below 90 mmHg (or needing inotropes to hold it there) with signs of hypoperfusion such as cool skin, low urine output, confusion or lactate above 2. A 12-lead ECG, urgent echocardiogram and blood tests including troponin, BNP and lactate confirm the picture.

  • What is the SCAI classification?

    The Society for Cardiovascular Angiography and Interventions grades cardiogenic shock from stage A (At risk) through B (Beginning), C (Classic), D (Deteriorating) to E (Extremis). It helps teams communicate severity and decide when to escalate to mechanical circulatory support.

  • What is mechanical circulatory support?

    MCS devices take over some of the heart’s work while it recovers or awaits surgery. Options include the intra-aortic balloon pump, Impella percutaneous LVADs, VA-ECMO for the sickest patients and durable LVADs such as HeartMate 3 as bridges to transplant or destination therapy.

  • Where is cardiogenic shock treated in the UK?

    It is treated in acute cardiology and intensive care units, with the sickest patients transferred to specialist cardiogenic shock and ECMO centres such as Papworth, Royal Brompton, Aberdeen, Leicester, Wythenshawe and Freeman. A shock team of cardiology, cardiac surgery, intensive care and specialist nursing coordinates care.

Related content

Keep reading.

Pulse Healthcare concierge

Send us your enquiry

A concierge service for UK private healthcare. We match you with the best vetted clinics and consultants in our network - they then contact you directly.

So we can match you to the right clinician close to you.

We reply to every enquiry within 24 hours (Mon–Fri). Confidential - your details are never shared outside our vetted consultant network.