Automated office blood pressure (BP) was measured in the recently published SPRINT trial; low target values were shown beneficial. We studied the relationships of automated blood pressure, measured in the health care centre, to manual office BP and to home BP.Design and Method:
Stable outpatients treated for hypertension were measured automatically, being seated alone in a quiet room, six times after a five-minute rest with the BpTRU device, and immediately afterwards using auscultatory method. Home BP was measured in a subgroup during seven days preceding the visit.Results:
The automated, office and home BP values were 131.2 ± 21.8/77.8 ± 12.1, 146.9 ± 20.8/85.8 ± 12.4, and 137.7 ± 17.7/79.4 ± 8.2 mmHg, respectively. Limits of agreement between office and automated BP (2 SDs in the Bland Altman plot) were +42.6 to -12.6/+22.6 to -6.6 mmHg for systolic/diastolic BP; for home and automated BP, they were +45.8 to -25.8/+20.8 to -12.6 mmHg. For patients with two visits, intraclass correlation coefficients of BP values measured during the first and second visit were 0.66/0.72 for systolic/diastolic automated BP and 0.68/0.74 for systolic/diastolic office BP.Conclusions:
Automated BP was much lower than manual office BP and still lower than home BP. It showed similar inter-visit variability as office BP. Whether automated BP and “white coat effect”, calculated as office BP – automated BP difference, should be used in clinical practice, deserves further studies.