Which type of extracorporeal membrane oxygenation (ECMO) is indicated for respiratory failure with secondary cardiac failure?

• A. Venovenous ECMO
• B. Venoarterial ECMO
• C. Arteriovenous ECMO
• D. Extracorporeal CO2 removal

Answer: (B)

When respiratory failure occurs with concurrent cardiac failure, you need a support modality that handles both oxygenation and circulation. Venoarterial ECMO does this by draining deoxygenated blood from the venous system, oxygenating it, and returning it to the arterial system. This configuration bypasses both the lungs and the heart, providing systemic perfusion and unloading the failing heart, which is exactly what’s needed in combined respiratory and cardiac failure.

Venovenous ECMO would still rely on the heart to pump the oxygenated blood to the body, so it won’t address insufficient cardiac output. Extracorporeal CO2 removal primarily reduces carbon dioxide and offers limited oxygenation and no direct circulatory support, making it unsuitable for a scenario with cardiac failure. Arteriovenous ECMO is not the standard approach and isn’t typically used to provide the necessary combined respiratory and hemodynamic support.