The T Loop in Right Ventricular Hypertrophy

¹ Department of Medicine, The Long Island Jewish Hospital Affiliation-Queens Hospital Center and The Long Island Jewish Hospital, Queens, New York

The T loop was evaluated in 62 patients with right ventricular hypertrophy. The findings revealed a posterior directed T loop that had a clockwise rotation in the horizontal plane and a counterclockwise rotation in the right sagittal plane. There was a significant increase in the width of the T loop in the horizontal and frontal plane. These characteristics were correlated with the classic scalar T waves of right ventricular enlargement and distinguished from ischemic T loop changes. The maximum width of the T loop was increased and the spatial length/width ratio was increased. In 37 percent of the cases the loop was abnormally wide (spatial L/W ratio 2.6 or less). There was no correlation between the level of the right ventricular pressure and the degree of change in the T loop.