Electrocardiography (ECG) in Pulmonary Disorders By Rebecca Dezube, MD, MHS, Johns Hopkins University Reviewed / Revised May 2021 | Modified Sep 2022 View Patient Education Electrocardiography (ECG) is a useful adjunct to other pulmonary tests because it provides information about the right side of the heart and therefore pulmonary disorders such as chronic pulmonary hypertension and pulmonary embolism.