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. Author manuscript; available in PMC: 2011 Jul 12.
Published in final edited form as: Circulation. 1963 Nov;28:893–905. doi: 10.1161/01.cir.28.5.893

Figure 6.

Figure 6

a to d. Correlation of the average angle (AA) between ÂQRS and ÂT in the frontal and horizontal planes with the hemodynamic data in 40 patients with pulmonary stenosis. The average QRS-T angle was calculated by averaging the QRS-T angles observed in the horizontal and frontal planes for each patient. The angle was called “positive” when the ÂQRS was clockwise from ÂT. The average QRS-T angle correlated better with peak gradient than with work inidex, resistance, or area. a. By the use of the equation, PG = (AA + 44)/1.4, approximate estimations of the gradient across the valve could be made from the electrocardiographic data of patients with pulmonary stenosis.