Key result
ANP and BNP levels were similar across obese and lean groups, with ANP correlating with left ventricular diastolic dysfunction and BNP correlating with both LV hypertrophy and diastolic dysfunction.
Why the study?
Do ANP and BNP levels correlate with preclinical cardiac disease in obese subjects?
Cross-Sectional (n=77)
Do ANP and BNP levels correlate with preclinical cardiac disease in obese subjects?
ANP and BNP can serve as useful markers of preclinical cardiac disease, specifically LV hypertrophy and diastolic dysfunction, in obese individuals.
ANP/BNP may mark preclinical LV changes in obesity; hypothesis-generating and requires prospective validation before clinical use.
BACKGROUND: Aim of the study was to evaluate the role of atrial (ANP) and brain natriuretic peptides (BNP) as markers of preclinical cardiac disease in obesity. METHODS: We selected 26 obese (BMI > 29 kg m(-2)) never-treated hypertensives (24-h BP > 140 and/or 90 mmHg), 26 obese normotensives (24-h BP < 130/80 mmHg) and 25 lean (BMI < or = 25 kg m(-2)) never-treated hypertensives. Each subject underwent measurements of ANP and BNP plasma levels, 24-h ambulatory blood pressure (BP) monitoring, digitized M-mode and Doppler echocardiography. RESULTS: Mean values of ANP and BNP were similar among the three groups. All the subjects had normal left ventricular (LV) systolic function. Within each group ANP levels were higher in patients with LV diastolic dysfunction than in patients with normal diastolic function, and BNP levels were higher in patients with LV hypertrophy and in patients with LV diastolic dysfunction. Within each group, ANP levels were inversely correlated with LV diastolic indices, whereas BNP levels were directly correlated with LV mass index and inversely correlated with LV diastolic indices. ANP and BNP levels were not correlated with other echocardiographic parameters, age, BMI or 24-h BP values. CONCLUSION: In normotensive and hypertensive obese subjects the relationships of ANP and BNP levels with LV morpho-functional characteristics follow the same trend as in lean hypertensives, with ANP mainly influenced by diastolic dysfunction and BNP influenced by both LV hypertrophy and LV diastolic dysfunction. Therefore ANP and BNP can be considered useful markers of preclinical cardiac disease in obesity.
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Grandi et al. (2004) conducted a cross-sectional in Obesity and hypertension (n=77). Obesity and hypertension vs. Lean hypertensives was evaluated on ANP and BNP plasma levels and correlation with echocardiographic parameters. ANP and BNP levels were similar across obese and lean groups, with ANP correlating with left ventricular diastolic dysfunction and BNP correlating with both LV hypertrophy and diastolic dysfunction.
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