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(Chest. 1970;58:244-248.)
© 1970 American College of Chest Physicians

New Data and Concepts Concerning the Ventricular Gradient

J. A. Abildskov M.D.1; Mary Jo Burgess M.D.1; Kay Millar M.D.1; and Roland Wyatt 1

1 Department of Medicine, University of Utah Medical Center, Salt Lake City, Utah

The ventricular gradient or QRST area is theoretically independent of ventricular activation sequence, provided recovery properties remain constant. Recent studies have shown that ventricular recovery is altered by ectopic stimulation and we report evidence that the alteration affects QRST area in a systematic fashion. The paper also summarizes evidence that the independence of QRST area from activation order depends on the use of leads which furnish equal opportunity for expression of activation and recovery processes. Finally, a new quantity titled the "primary T wave" which represents the time course of the ventricular gradient is described.






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