FEASIBILITY OF SCHOOL-BASED SCREENING FOR HIGH BLOOD PRESSURE IN CHILDREN: THE HEALTHY HEARTS @ SCHOOL STUDY

Abstract

Objective: High blood pressure (BP) in childhood is associated with end organ damage and cardiovascular events in mid-adulthood. Community-based BP screening may improve equitable access and awareness, but robust methodology is required. Accordingly, our aim was to assess the acceptability and feasibility of a two-stage school-based BP screening program incorporating targeted 24-hour ambulatory blood pressure monitoring (ABPM). Design and method: One-hundred-ninety-eight children (59% male, 7.6–12.7 years) in grades 3-6 were recruited from three primary schools in Melbourne, Australia. Following an education session for all children in these grades, BP was measured five times in students after parental consent, using the auscultatory method, alternating between arms and after five minutes of rest. Those with an average BP >85th percentile (AAP thresholds) or a risk factor for high BP had these measurements repeated two weeks later, along with ABPM. Families and students also completed an optional questionnaire post-program. Results: At the first assessment, 11 (5.6%) and 10 (5.0%) had elevated or hypertensive BP respectively (14.6% combined if using just the first measure). Fifty-nine (29.8%) were selected for the second assessment (including 10 with obesity, 15 born premature, four with a history of congenital heart disease, and nine with BP >85th percentile, but <90th percentile), of which 52 attended. ABPM indicated that 11 (5.6%) and five (2.5%) had white coat hypertension based on assessment one and two respectively, three (1.5%) had sustained hypertension (based on either assessment stage), and two (1%) had masked hypertension. Three additional participants each had either high BPs during school assessment but did not undertake, or had inconclusive, ABPMs. Overall, 11 (5.6%) were referred to a doctor for medical follow-up. The majority of students (67%) reported that ABPM was tolerable (‘bothersome’ score <8/10 for day and/or night). 96% of families approved of the program and 90% welcomed it as part of their child's schooling. Conclusions: These data indicate that a school-based BP screening program is acceptable and feasible, and that measuring BP on multiple occasions, and with targeted ABPM, is pivotal for minimising false positives and unnecessary referrals.