title: [The influence of electrical time interval indices and aging on the left atrial systolic time intervals].
abstract: The influence of aging and heart rate on left ventricular systolic time intervals is well known, but the effects on left atrial systolic time intervals, a new index of left atrial function, remain unknown. The influence of aging and heart rate on left atrial systolic time intervals was investigated in 43 normal subjects (13-72 years of age) by Doppler echocardiography. Atrial pre-ejection period, atrial ejection time, and corrected atrial pre-ejection period were obtained by transmitral Doppler echocardiography. Simple regression analysis showed atrial pre-ejection period significantly correlated with P wave duration (PP; r = 0.78), and PR interval (PR; r = 0.60), but not with RR interval (RR). However, multiple regression analysis showed atrial pre-ejection period significantly correlated only with PP. Simple regression analysis found atrial ejection time significantly correlated with PP (r = 0.38), and PR (r = 0.39), but not with RR. However, multiple regression analysis found atrial ejection time did not correlate with any factor significantly. Aging was significantly correlated with corrected atrial pre-ejection period (r = -0.37), but not with corrected atrial ejection time and atrial pre-ejection period. Atrial ejection time significantly correlated with corrected atrial pre-ejection period (r = -0.37), but not with atrial pre-ejection period. Corrected atrial pre-ejection period is a clinically useful index of left atrial systolic function.
authors.affiliation: First Department of Internal Medicine, Kobe University School of Medicine.
authors.forename: Y
authors.initials: Y
authors.lastname: Takeuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Yokota
authors.forename: H
authors.initials: H
authors.lastname: Kawai
authors.forename: Y
authors.initials: Y
authors.lastname: Tsumura
authors.forename: M
authors.initials: M
authors.lastname: Nakatani
authors.forename: J
authors.initials: J
authors.lastname: Shite
authors.forename: M
authors.initials: M
authors.lastname: Yokoyama
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D016279:Atrial Function, Left / Q000502:physiology*; D015150:Echocardiography, Doppler; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013599:Systole / Q000502:physiology*