Published April 29, 2018 at 2560 × 2214 in “Pink fluid coming up the tube”.. ECMO, LV distention, and more! EE 020 LV vent in ECMO circuit diagram ← Previous Next → ECMO circuit diagram showing how left ventricular “vent” can be incorporated in the circuit. In this diagram a transaortic catheter is used. Image from Hong et al, 2016. (Click image for source).