title: Time course of changes in P-wave duration during exercise.
abstract: The exercise-induced increase in P-wave duration reported previously has not been studied on a minute-by-minute basis. We measured the P duration in 47 normal subjects and 43 coronary artery disease (CAD) patients each minute during an exercise test. We found that prolongation of the P wave in those with CAD occurs relatively early and the difference between normal subjects and CAD patients is greater near maximum exercise. The data suggest that an increase in P-wave duration may reflect an increase in the left-ventricular end-diastolic pressure and may occur earlier that ST-segment depression.
authors.affiliation: Memorial Heart Institute, Long Beach Memorial Medical Center, Calif., USA.
authors.forename: A
authors.initials: A
authors.lastname: Pandya
authors.forename: M H
authors.initials: MH
authors.lastname: Ellestad
authors.forename: R
authors.initials: R
authors.lastname: Crump
mesh_terms: D003327:Coronary Disease / Q000503:physiopathology*; D004562:Electrocardiography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods; D006339:Heart Rate; D006801:Humans; D012680:Sensitivity and Specificity