Optimum frequency of office blood pressure measurement using an automated sphygmomanometer

Blood Press Monit. 2008 Dec;13(6):333-8. doi: 10.1097/MBP.0b013e3283104247.


Objective: To determine the optimum interval between serial blood pressure measurements using an automated BpTRU sphygmomanometer.

Methods: Two groups of 200 patients each had automated office measurements taken using the BpTRU device at either 1-min or 2-min intervals from the start of one reading to the start of the next reading with a 24-h ambulatory blood pressure (ABP) recording being performed. Another series of 50 patients had BpTRU readings taken at 1-min and 2-min intervals before and after 24-h ABP monitoring. The difference between the mean awake ABP and the mean automated office BP readings were compared for recordings taken at 1-min versus 2-min intervals.

Results: In the between-patient comparison (n=400), mean awake ABP was similar to automated BP recordings in the examining room at either 1-min or 2-min intervals except for a slightly lower (-4 mmHg) diastolic BP with the 1-min interval (P<0.01 vs. ABP). In the within-patient comparison (n=50), there was no consistent difference between automated BP readings taken in the examining room at 1-min versus 2-min intervals. Overall, the mean automated BP values tended to be slightly lower than the mean awake ABP.

Conclusion: Automated measurement of BP in the office setting with devices such as the BpTRU can be taken as frequently as every 1 min without affecting the accuracy of the reading. Small differences in BP between the 1 and 2-min settings and between the automated BpTRU and ABP readings were within accepted clinical standards for validation criteria.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Blood Pressure / physiology*
  • Blood Pressure Determination / instrumentation*
  • Blood Pressure Determination / methods*
  • Blood Pressure Monitoring, Ambulatory / standards*
  • Female
  • Humans
  • Hypertension / physiopathology
  • Male
  • Middle Aged
  • Office Visits
  • Physicians' Offices
  • Sphygmomanometers*
  • Time Factors