Diagnosis of Coarctation of the Aorta with the Aid of the Low Frequency, Critically Damped Ballistocardiograph

Abstract
Ballistocardiograms taken with the low frequency, critically damped ballistocardiograph on 17 patients having coarctation of the aorta have a characteristic pattern in which the K wave is absent. In the patients in whom the coarctation was surgically removed, the pattern returned toward the normal type with reappearance of the K wave.