A Constructed Method of the QRS Loop in Right Ventricular Hypertrophy

In order to investigate the cause of the QRS loop change in right ventricular hypertrophy, the present authors have employed their constructed method of the QRS loop. 1) increasing the vectors of the right ventricle including the right side of the septum and 2) prolongation of depolarization process in the right ventricle are required to construct the QRS loops in systolic overload of the ventricle. Next, 1) increasing the vectors of the right ventricle (the increasing ratio of the vectors in the anterior and lateral wall of the right ventricle are larger than that in the posterior wall) and 2) delay of the start of the depolarization process in the right ventricle are necessary in diastolic overload of the right ventricle. Then, the reason of difference of the QRS loops in systolic and diastolic overload is discussed.