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Lookup NU author(s): Professor Bernard Keavney, Hannah Watkins
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AIMS: To assess the heritability (i.e. relative contribution of genetic factors to the variability) of continuous measures of left ventricular hypertrophy determined by electrocardiography and echocardiography. METHODS AND RESULTS: We studied 955 members of 229 Caucasian families, ascertained through a hypertensive proband. Electrocardiographic measurements were performed manually on resting 12-lead electrocardiograms, and echocardiographic measurements were made on M-mode images. Sex-specific residuals for the left ventricular phenotypes were calculated, adjusted for age, systolic blood pressure, weight, height, waist-hip ratio, and presence of diabetes. Heritability was estimated in two ways: firstly, from familial correlations with adjustment for spouse resemblance; and secondly by using variance components methods with ascertainment correction for proband status. The heritability estimates (given as a range derived from the two methods) were higher for Sokolow-Lyon voltage (39-41%) than for echocardiographic left ventricular mass (23-29%). Electrocardiographic left ventricular mass, Cornell voltage, and Cornell product had heritability estimates of 12-18%, 19-25%, and 28-32%, respectively. CONCLUSIONS: Genetic factors may explain a substantial proportion of variability in quantitative electrocardiographic and echocardiographic measures of left ventricular hypertrophy. The greater heritability of Sokolow-Lyon voltage suggests that electrocardiographic phenotypes may be particularly important for the molecular investigation of the genetic susceptibility to cardiac hypertrophy.
Author(s): Keavney B; Watkins H; Mayosi BM; Kardos A; Davies CH; Ratcliffe PJ; Farrall M
Publication type: Article
Publication status: Published
Journal: European Heart Journal
Year: 2002
Volume: 23
Issue: 24
Pages: 1963-1971
ISSN (print): 0195-668X
ISSN (electronic): 1522-9645
Publisher: Oxford University Press
URL: http://dx.doi.org/10.1053/euhj.2002.3288
DOI: 10.1053/euhj.2002.3288
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