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VA-ECMO — Management of Cardiogenic Shock and Refractory Arrest

Veno-arterial extracorporeal life support for refractory cardiogenic shock and the ECPR protocol.

Written by: Saygı Hospital Health Guide Editorial Board
Published: · Last updated:

This content is for general information; please consult your physician for diagnosis and treatment.

References (3)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Kardiyoloji department. Book Appointment →

What is VA-ECMO — Management of Cardiogenic Shock and Refractory Arrest?

VA-ECMO (Veno-Arterial Extracorporeal Membrane Oxygenation) is a life-support system that provides both respiratory support (oxygenation, CO2 removal) and circulatory support (flow generation). Blood is drained from a vein, oxygenated, and returned to the arterial system — similar to cardiopulmonary bypass.

Indications — cardiogenic shock (acute MI complication, fulminant myocarditis, postcardiotomy low output, declined heart transplant), refractory cardiac arrest (ECPR — witnessed arrest, short no-flow time, reversible cause), and bridge therapy (to VAD, to transplantation).

Cannulation — peripheral (femoral venous drainage + femoral arterial reinfusion — most common, rapid, can be performed in the cath lab) or central (aorta + right atrium after cardiac surgery — better flow but invasive). Target flow 4-6 L/min.

Critical complications — left-ventricular distension and overload from retrograde flow → LV unloading may be required (IABP, Impella CP/5.5, atrial septostomy, decompression via pulmonary artery catheter). Lower-extremity ischemia → distal perfusion catheter (6-8 French) is mandatory.

Symptoms

Cardiogenic shock complicating acute MI — persistent shock after primary PCI, mechanical complications (VSD, severe MR), cardiac arrest
Fulminant myocarditis — sudden heart failure, elevated troponin, severely reduced function on echocardiography
Postcardiotomy low output — failure to wean from bypass after CABG/valve surgery
Refractory cardiac arrest (ECPR) — witnessed, short no-flow (<5 min), short low-flow, reversible cause (occluded coronary, PE, hypothermia)
Bridge to transplantation — severe cardiomyopathy awaiting cardiac transplantation

Risk Factors

Contraindications — terminal malignancy, advanced multi-organ failure, severe aortic regurgitation (vicious cycle of retrograde flow), irreversible neurological injury
Cannulation complications — major vessel injury, retroperitoneal hematoma, dissection, pseudoaneurysm
Left-ventricular overload — pulmonary edema, pulmonary hemorrhage; increased LV filling worsens edema
Lower-extremity ischemia — without a distal perfusion catheter, risk of compartment syndrome and amputation (10-25%)
Harlequin / north-south syndrome — in peripheral VA-ECMO, the left arm/head receives poorly oxygenated blood (from LV via pulmonary vein), while the right arm/lower body is well perfused from ECMO reinfusion

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Cardiogenic shock SCAI stage C/D with high-dose vasoactives and unresponsive IABP or Impella
  • Refractory arrest without ROSC (>15-20 min) with a potential reversible cause and ECPR candidacy
  • Inability to wean from bypass after cardiotomy — intraoperative emergency VA-ECMO assessment

Treatment Methods

01
Cannulation — peripheral (femoral vein 23-25 Fr drainage + femoral artery 15-19 Fr reinfusion, ipsilateral or contralateral); MANDATORY distal perfusion catheter (6-8 Fr, superficial femoral or posterior tibial artery)
02
Flow and calibration — start flow 3-4 L/min, target 4-6 L/min (for cardiac output support), sweep 3-6 L/min at FiO2 100%. Target MAP 65-75 mmHg (avoid excessive PVR)
03
Anticoagulation — heparin bolus (5000-10 000 U) plus infusion (ACT 180-220 or aPTT 1.5-2×). Argatroban or bivalirudin as alternatives in HIT
04
LV unloading — if LV distension / pulmonary edema develops, consider IABP, Impella CP/5.5, atrial septostomy, or microaxial devices (with continuous monitoring); assess early
05
Complication management — Harlequin: monitor right radial-artery blood gas; switch to V-A-V if needed. Distal ischemia: check distal perfusion catheter, monitor with Doppler. Bleeding: target the lower end of the anticoagulation range
06
Weaning and decannulation — as cardiac function improves (echo EF >25-35%, appropriate pulmonary capillary wedge pressure), gradually reduce flow; weaning trial at 1-2 L/min for 30-60 minutes. Decannulation is surgical (arterial repair) or percutaneous (MANTA, Perclose)

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You can visit our Kardiyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.