INTRODUCTION:

Hypertension (HTN) diagnosis depends on the accuracy and representativeness of blood pressure (BP) obtained by different methods. In pediatric obese patients, office BP can present great variability and does not detect nighttime changes. Ambulatory Blood Pressure Monitoring (ABPM) allows recognition of HTN phenotypes and predicts HTN severity in an earlier and assertive way.

OBJECTIVE:

To compare HTN stages defined by office BP with ABPM, and describe prevalence of masked HTM in pediatric sample from a reference service.

METHODS:

Retrospective cohort of pediatric patients with primary HTN. Patients underwent a detailed clinical history and examination. BP was measured by auscultatory method with technique adequacy. BP was checked at 2 other visits (2 week interval) and the mean BP of these 3 visits was used to classify BP according recommendations. ABPM was performed with pediatric validated device, with a revised report for this analysis, according to guidelines. Mean 24-hours awake and sleep BP and load were considered to identify HTN phenotypes according to 95th percentile for sex, age and height. Diagnosis and stages of HTN based on office BP were compared with ABPM. Patients with sustained HTN had secondary causes discharged after investigation and target organ damage (TOD) was also evaluated.

RESULTS:

Were included 16 patients with primary HTN, mean age 13 ± 3.3 years, 62% male, 87% obese or overweight (mean weight 89 ± 28.9kg) and 75% with first degree family history of HTN. Of these, as in Figure 1, masked hypertension was detected in 37.5% (6/16), white coat HTN in 12.5% (2/16), and in 68% of the sample (11/16) ABPM classified HTN at higher stage compared to office BP. Nocturnal HTN was present in 81% (13/16). None patient had TOD and at follow-up, 12 required antihypertensive drugs, with 68% of BP control.

CONCLUSION:

For this obese primary hypertensive pediatric sample, ABPM seems to be essential for HTN diagnosis and stratification, evidencing frequent nocturnal changes in BP. Complementary tests to investigate obstructive sleep apnea weren’t done but this could be an associated factor.