Studies Utilizing the Portable Electromagnetic

Ballstocad(liographic studies were done on 28 subjects with left bundle branch block and on 18 subjects with right bundle branch block. The influence of ventricular as nchronism, and the predominance of left or right ventricular disease, upon the derivation and interpretation of the ballistocar(liograsn, is discussed. The ballistocardiogram was found to be a valuable objective guide in the detection of subjects whose bundle branch blcck was not associated with significant heart (lsease. The ballistocardiogram also provided helpful confirmatoryN evidence of coronary artery oI' hypertensive heart disease when this was the suspected or certain diagnosis in subjects with bundle branch block.