Gender Dimorphic Associations between N-Terminal Pro-Brain Natriuretic Peptide, Body Mass Index and Blood Pressure in Children and Adolescents

BACKGROUND: Obesity and hypertension are often comorbid, but the pathophysiologic mechanisms that link them are not fully understood. Natriuretic peptides might play a role in this association. The majority of studies show lower brain natriuretic peptide (BNP) concentrations as well as lower concentrations of the N-terminal of the prohormone (NT-proBNP) in obese than normal body mass index (BMI) adults and higher BNP concentrations in hypertensive than in normotensive individuals. In children, there are no studies examining the relations between NT-proBNP, BMI and blood pressure. MATERIALS AND METHODS: Ninety-six children, 24 obese/25 normal BMI boys, and 23 obese/24 normal BMI girls, aged 10-16 years, were studied. Plasma NT-proBNP was measured using electrochemiluminescence. RESULTS: In males, NT-proBNP concentrations were lower in the obese than the normal BMI group but higher in the obese hypertensive than the obese normotensive group (p = 0.04). In addition, a significant positive correlation was noted between plasma NT-proBNP and blood pressure (p = 0.03) only in obese males. In females, no correlations were detected between NT-proBNP, BMI and systolic or diastolic blood pressure. CONCLUSIONS: Longitudinal studies are needed to define the role of NT-proBNP as a screening biomarker in obese children, particularly males, to determine their risk for developing arterial hypertension.