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No further decrease in blood pressure when the interval between readings exceeds one hour

Arnaud Chiolero1, Jacqueline C Witteman, Bharathi Viswanathan

  • 1Community Prevention Unit, Institute of Social and Preventive Medicine, University Hospital Center, University of Lausanne, Switzerland.

Blood Pressure Monitoring
|March 19, 2008
PubMed

Insights

Increasing the time between blood pressure (BP) readings during a single visit did not significantly alter BP estimates. This suggests longer intervals between BP measurements are not a substitute for multiple separate visits for hypertension diagnosis.

Area of Science:

  • Cardiovascular Health
  • Epidemiology
  • Clinical Measurement

Background:

  • Traditional blood pressure (BP) assessment relies on infrequent readings.
  • The impact of extended intervals between BP measurements within a single visit is not well understood.

Purpose of the Study:

  • To investigate whether increasing the time between blood pressure readings on a single visit affects BP estimates.
  • To determine if longer intervals between BP measurements could be a valid alternative to multiple separate visits for hypertension diagnosis.

Main Methods:

  • A population-based survey of cardiovascular risk factors was conducted in Seychelles.
  • Blood pressure was measured three times: once upon arrival (BP1) and twice before discharge (BP2, BP3) with varying intervals (15-351 minutes between BP1 and BP3).

Main Results:

  • Subsequent BP readings showed a decreasing trend (BP1 > BP2 > BP3).
  • The difference in BP between the first and last measurements (DeltaBP1-BP3) did not significantly correlate with the time interval between readings.
  • Multivariate analysis indicated DeltaBP was associated with initial BP level and sex, but not time between measurements.

Conclusions:

  • The observed decrease in BP readings did not vary significantly based on whether the interval between measurements exceeded one hour.
  • Extending the time interval between repeated BP readings during a single visit is unlikely to be a valid strategy for defining hypertension.
  • Current recommendations for multiple, separate visits for hypertension diagnosis remain advisable.
Abstract

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