Circulating N-terminal pro-atrial natriuretic peptide is an independent predictor of left ventricular hypertrophy in the general population. The Tromsø Study.

Abstract

The purpose of this study was to determine whether circulating N-terminal pro-atrial natriuretic peptide (N-ANP) levels predict left ventricular hypertrophy in the general population after adjustment for relevant risk factors. In a population-based sample of 3287 subjects aged 25-85 years, circulating N-ANP was measured in a subgroup of 389 subjects. Left ventricular mass and ejection fraction were determined by two-dimensional guided M-mode echocardiography. Left ventricular hypertrophy was defined as height adjusted mass above 145.5 g. m-1 and 125.4 g. m-1, in men and women, respectively. Fifty-one subjects with left ventricular hypertrophy had significantly higher N-ANP levels than controls (1075 vs 763 pmol. l-1;P<0.0001). A gradually increasing prevalence of left ventricular hypertrophy over increasing 500 pmol. l-1 intervals of N-ANP was observed (1.8 to 64. 3%; (Chi-squared P for trend <0.001). N-ANP was an independent predictor of left ventricular hypertrophy after adjustment for ejection fraction, body mass index, hypertension, valvular disease, a history of myocardial infarction, gender, and age. The adjusted odds ratio for left ventricular hypertrophy was 1.79 (95% CI 1.04-3. 07) for a 500 pmol. l-1 increase in N-ANP. A substantial proportion of subjects with elevated N-ANP levels had combined left ventricular hypertrophy and left ventricular dysfunction. These results suggests that N-ANP is an independent predictor of left ventricular hypertrophy in the general population. N-ANP determination is, however, poorly suited to distinguish between subjects with isolated left ventricular hypertrophy and left ventricular dysfunction with or without left ventricular hypertrophy.