Key result
A 6-hour ABPM session approximates 24-hour mean systolic BP within ~5 mm Hg.
Why the study?
Ambulatory blood pressure monitoring requires significant time, and the accuracy of shortened time intervals to approximate full 24-hour ABPM results is unclear.
Does a shortened ABPM session accurately approximate the mean systolic BP of a full 24-hour ABPM session?
Observational (n=1,004)
Does a shortened ABPM session accurately approximate the mean systolic BP of a full 24-hour ABPM session?
Mean Difference: 5.41
A 6-hour ABPM session can approximate the 24-hour mean systolic BP but fails to capture circadian variation and may overestimate BP levels.
Shortened ABPM intervals may approximate full-session systolic BP; leaves open their validity for risk stratification pending prospective validation.
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.
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Ernst et al. (2008) reported an observational. 6-hour ambulatory blood pressure monitoring vs. Full 24-hour ambulatory blood pressure monitoring was evaluated on Mean systolic blood pressure (MD 5.41 mm Hg). A 6-hour ambulatory blood pressure monitoring session approximated the full 24-hour mean systolic BP with a mean difference of 5.41 mm Hg.
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