How well does a shortened time interval characterize results of a full ambulatory blood pressure monitoring session?
Ambulatory blood pressure monitoring (ABPM) is useful in evaluating cardiovascular risk but requires significant time. The authors examined how closely shortened time intervals correlate with the systolic blood pressure (BP) determined from a full 24-hour ABPM session in 1004 ABPM recordings. After excluding the first hour, Pearson correlations performed for the mean systolic BP of the subsequent 3-, 5-, and 7-hour periods (4, 6, and 8 hours total) with the entire, and remainder of the session, demonstrated greatest improvement in correlation when the session is increased from 4 to 6 hours. Bland-Altman analysis of the 6-hour time period revealed a mean difference of 5.41 mm Hg compared with the full session mean. The authors conclude that 6-hour ABPM can approximate the overall mean BP obtained from full 24-hour ABPM. However, shortened sessions do not characterize the influence of circadian variation on the 24-hour mean BP and may overestimate the 24-hour BP levels.
Division of Clinical and Administrative Pharmacy, College of Pharmacy, University of Iowa, Iowa City, IA 52242, USA. michael-ernst@uiowa.edu
Michael E
ME
Ernst
Cynthia A
CA
Weber
Jeffrey D
JD
Dawson
Michelle A
MA
O'Connor
Wenjiao
W
Lin
Barry L
BL
Carter
George R
GR
Bergus
D018660:Blood Pressure Monitoring, Ambulatory / Q000379:methods*; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D016013:Likelihood Functions; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D013599:Systole