Clinical Impact of 3- Vs. 5-Minute Delay and 30- Vs. 60-Second Intervals on Unattended Automated Office Blood Pressure Measurements.

BACKGROUND

Guidelines advise automated office blood pressure (AOBP) with an initial 5-minute delay and multiple measurements at least 60 seconds apart. Recent studies suggest that AOBP may be accurate with shorter delays or intervals, but evidence in clinical settings is limited.

METHODS

Patients referred to 1 hypertension (HTN) center underwent 24-hour ambulatory blood pressure monitoring (ABPM) and 1 of 4 nonrandomized, unattended AOBP protocols: a 3- or 5-minute delay with a 30- or 60-second interval, i.e., 3 min/30 s/30 s, 3/60/60, 5/30/30 and 5/60/60 protocols. HTN was defined as systolic blood pressure (SBP) ≥140 or diastolic blood pressure ≥90 mm Hg.

RESULTS

We compared differences in mean blood pressure and HTN classification between average AOBP and awake-time ABPM by t-tests and Fisher's exact test. Among 212 participants (mean 58.9 years, 61% women, 25% Black), there was substantial overlap in the probability distributions of awake-time ABPM and each of the 3 AOBP measures. SBP means were similar between the 5/60/60 and 3/30/30 protocols and 5/30/30 and 3/60/60 protocols. The 5/30/30 was associated with a higher proportion of systolic HTN, while the 3/60/60 protocol was associated with a higher proportion of diastolic HTN. There were no significant differences in systolic or diastolic HTN between 5/60/60 and 3/30/30 protocols with respect to awake-time ABPM.

CONCLUSIONS

In this quality improvement study, the shortest AOBP protocol did not differ significantly from the longest protocol. The time savings of shorter protocols may improve AOBP adoption in clinical practice without meaningfully compromising accuracy.