A recent Critical Care commentary by Coveliers and colleagues re-examines whether pulmonary capillary wedge pressure (PCWP) accurately reflects left ventricular (LV) loading during femoro-axillary venoarterial extracorporeal membrane oxygenation (VA-ECMO). The commentary addresses a study in which increasing ECMO flow from 2 to 4 L/min produced minimal changes in PCWP, prompting the original investigators to suggest…