Accuracy of community-based blood pressure devices versus validated self-use devices.

Objectives: To examine the accuracy of a community-based blood pressure monitor (CBPM) versus a validated automatic blood pressure monitor (ABPM); to assess providers' recommendations regarding use of CBPMs; and to assess if potentially inaccurate blood pressure readings may result in treatment changes.

Methods: A convenience sample of 50 participants was recruited and met criteria for a randomized, controlled, crossover design trial in a community pharmacy in January and February 2013. Participants completed a screening survey and were educated about how a pharmacist can assist in achieving blood pressure control. Blood pressure measurements were performed using a CBPM and a validated ABPM. Participants were asked to identify their primary care provider (PCP); if identified, the PCP was faxed a survey to complete. The difference in blood pressure readings between the two monitors was examined and PCP survey responses were examined.

Results: There were significant differences between the means obtained from the two different monitors for systolic blood pressure (P = 0.006) and diastolic blood pressure (P = 0.012) measurements. Due to differences between readings, recommendations for change in treatment (or initiation of blood pressure medication) may have been different for 38% of participants. PCPs indicated that they often recommend CBPMs for self-monitoring.

Conclusion: Patients, pharmacists, and providers should be aware of potential inaccuracies when using a CBPM for self-monitoring.