Does the Body Mass Index Category Influence Ambulatory Blood Pressure Parameters in Office Normotensive Obese Children?

The aim of our study was to investigate the influence of the degree of obesity on ambulatory blood pressure parameters in selected group of office normotensive obese children and adolescents. Our study involved 119 obese patients (55 males, 46.2%) aged 7–18 years divided into 3 groups based on their body mass index Z-score, who underwent ambulatory blood pressure monitoring. Our results show that obese patients, even when office normotensive, have alterations in blood pressure values obtained by ambulatory blood pressure monitoring. We found a positive correlation between systolic and diastolic blood pressure and body mass index in our patients (p≤\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\le$$\end{document} 0.001). Daytime blood pressure load correlated with rising body mass index and was higher in groups II and III compared to group I (p < 0.001). Body mass index category did not influence the dipping pattern in our subjects although most of our subjects (66.4%) showed non-dipping pattern for systolic blood pressure. The difference in blood pressure variability was confirmed only for daytime systolic and diastolic values between groups I and II (p = 0.019 and p = 0.002, respectively). In conclusion, our study showed that in office normotensive obese children and adolescents, systolic and diastolic blood pressure values obtained by ambulatory blood pressure monitoring are higher in subjects with higher body mass index. Patients with increased body mass index also have higher percentage of blood pressure readings above 95th percentile and increased daytime blood pressure variability. Obese patients show non-dipping pattern, independently of the rising body mass index category.