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Comment & Response
September 2016

Critical Flaws in the Validation of the Instant Blood Pressure Smartphone App—A Letter from the App Developers—Reply

Author Affiliations
  • 1Division of General Internal Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland
  • 2Welch Center for Prevention, Epidemiology and Clinical Research, The Johns Hopkins University School of Medicine, Baltimore, Maryland
  • 3Ciccarone Center for Prevention of Heart Disease, Division of Cardiology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
JAMA Intern Med. 2016;176(9):1410-1411. doi:10.1001/jamainternmed.2016.4765

In Reply In a letter to the editor in this issue of JAMA Internal Medicine, Archdeacon et al raise 4 concerns about our assessment of the Instant Blood Pressure (IBP) app. First, regarding IBP’s limited functional range, we included all participants as blood pressure (BP) cannot be known without measurement, and assessing BP is the app’s purpose. We expected IBP to present out-of-range errors if BP fell outside its range. However, no such error was presented, and IBP commonly reported a falsely reassuring BP when the actual BP was beyond its upper limit. Among the 6 participants with reference device systolic BP greater than 158 mm Hg, IBP reported a mean (SD) systolic BP of 129.4 (6.8) mm Hg; only 1 user received a measurement in the hypertensive range (systolic BP≥140 mm Hg).

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