Supplemental Oxygen Decreases Cardiac Effort in Pulmonary Arterial Hypertension

ABSTRACT In this single‐blind, crossover pilot study, supplemental oxygen at 2 L/min during 6‐min walk test reduced Cardiac Effort in patients with pulmonary arterial hypertension, while 6‐min walk distance remained unchanged. This decrease suggests improved physiology for an unchanged workload. Continuous electrocardiogram heart rate monitoring adds considerable value to the 6‐min walk.