Age-gender influence on the rate-corrected QT interval and the QT-heart rate relation in families with genotypically characterized long QT syndrome

M. H. Lehmann, K. W. Timothy, D. Frankovich, B. S. Fromm, M. Keating, E. H. Locati, R. T. Taggart, J. A. Towbin, A. J. Moss, P. J. Schwartz, G. M. Vincent

Research output: Contribution to journalArticle

Abstract

Objectives. We sought to analyze age-gender differences in the rate-corrected QT (QTc) interval in the presence of a QT-prolonging gene. Background. Compared with men, women exhibit a longer QTc interval and an increased propensity toward torsade de pointes. In normal subjects, the QTc gender difference reflects QTc interval shortening in men during adolescence. Methods. QTc intervals were analyzed according to age (<16 or ≤ 16 years) and gender in 460 genotyped blood relatives from families with long QT syndrome linked to chromosome 11p (KVLQT1; n = 199), 7q (HERG; n = 208) or 3p (SCN5A; n = 53). Results. The mean QTc interval in genotype-negative blood relatives (n = 240) was shortest in men, but similar among women, boys and girls. For genotype-positive blood relatives, men exhibited the shortest mean QTc interval in chromosome 7q- and 11p-linked blood relatives (n = 194), but not in the smaller 3p-linked group (n = 26). Among pooled 7q- and 11p-linked blood relatives, multiple regression analysis identified both genotype (p <0.001) and age-gender group (men vs. women/children; p <0.001) as significant predictors of the QTc interval; and heart rate (p <0.001), genotype (p <0.001) and age-gender group (p = 0.01) as significant predictors of the absolute QT interval. A shorter mean QT interval in men was most evident for heart rates

Original languageEnglish
Pages (from-to)93-99
Number of pages7
JournalJournal of the American College of Cardiology
Volume29
Issue number1
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Nursing(all)

Fingerprint Dive into the research topics of 'Age-gender influence on the rate-corrected QT interval and the QT-heart rate relation in families with genotypically characterized long QT syndrome'. Together they form a unique fingerprint.

Cite this