If you observe a large amount of LV vent return, what should you consider?

• A. Pulmonary edema
• B. Possible LSVC
• C. Systemic hypertension
• D. Dysfunctional LV

Answer: (B)

A large amount of LV vent return points to an extra source feeding the left ventricle during bypass. A persistent left superior vena cava can drain venous blood into the left heart (often via the coronary sinus or directly into the left atrium), increasing left-sided blood flow that the LV vent must remove. This unusual venous pathway is the reason to consider a LSVC when you see a lot of LV vent suction. Pulmonary edema would show lung fluid overload rather than an abnormal left-heart inflow pattern; systemic hypertension affects pressures elsewhere; a dysfunctional LV can cause venting needs but doesn’t specifically explain a large LV vent return from an anomalous venous drainage. If suspected, evaluate with imaging (e.g., TEE) and review venous anatomy to confirm LSVC.