Comparison of an in-pharmacy automated blood pressure kiosk to daytime ambulatory blood pressure in hypertensive subjects

Abstract

The objective of this study was to compare serial readings from an in–pharmacy automated blood pressure (BP) kiosk to mean daytime ambulatory BP. A total of 100 community–dwelling adults with hypertension underwent (1) three baseline automated office readings; (2) three in–pharmacy readings on each of four visits (12 total) using the PharmaSmart PS–2000 kiosk; and (3) 24–hour ambulatory BP monitoring between in–pharmacy visits two and three. Paired t–tests, Bland–Altman plots, and Pearson correlation coefficients were used for analysis. Mean BPs were 137.8 ± 13.7/81.9 ± 12.2 mm Hg for in–pharmacy and 135.5 ± 11.7/79.7 ± 10.0 mm Hg for daytime ambulatory (difference of 2.3 ± 9.5/2.2 ± 6.9 mm Hg [P ≤ .05]). Bland–Altman plots depicted a high degree of BP variability but did not show clinically important systematic BP differences. With ambulatory BP as the reference standard, in–pharmacy device results were similar to automated office results. The PharmaSmart PS–2000 closely approximated mean daytime ambulatory BP, supporting the use of serial readings from this device in the assessment of BP.