Clinical Disease

critical-care

High-impact pattern

VA-ECMO After Cardiotomy: Post-Cardiotomy Mechanical Circulatory Support

Indications, weaning, LV venting, and complication management for venoarterial ECMO following adult cardiac surgery

VA-ECMO post-cardiotomy rescues failure-to-wean CPB or postop cardiogenic shock; retrograde flow ↑LV afterload → distention, pulmonary edema, and differential hypoxia. Vent the LV, monitor right radial, distal-perfuse.

If you forget

Post-cardiotomy VA-ECMO indications: failure-to-wean CPB, postop cardiogenic shock, refractory cardiac arrest.

Board trap

On peripheral femoral VA-ECMO, native LV ejects poorly-oxygenated blood cephalad (brain/coronaries) while ECMO flow oxygenates the lower body — right radial PaO2 may be 20-50% lower than left radial. Monitor right radial ABG; treat by ↑ECMO flow, ↓native PVR (FiO2/ventilation), or convert to axillary/central cannulation.

Key numbers

ACT target 180-220 s; aPTT 1.5-2x control
Distal perfusion cannula: 6-8 Fr antegrade in superficial femoral artery
LV vent threshold: LVEDD >55-60 mm or persistent aortic-valve closure on echo
Differential hypoxia: right radial PaO2 20-50% lower than left radial
Wean trial: ECMO flow 1-1.5 L/min ×30-60 min
Hgb goal ≥8 g/dL (≥10 g/dL with end-organ ischemia)

Reviewed Sep 24, 2026 for clinical accuracy by BoardsBridge Editorial Process

Uri Rozen, MD — Licensed Physician, Israel

Source guidelines: AHA MCS Cardiogenic Shock 2023 · AHA MCS Cardiogenic Shock 2023 · AHA MCS Cardiogenic Shock 2023 · AHA MCS Cardiogenic Shock 2023

Re-review cadence: 12 months from reviewed date.

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Related on BoardsBridge

Card ID: ecmo-va-post-cardiotomy · Path: aba.critical-care.respiratory-failure.ecmo-va-post-cardiotomy