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Comment & Response |

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

Ryan Archdeacon, BS1; Ryan Schneider1; Yu Jiang1
[+] Author Affiliations
1AuraLife, Newport Beach, California.
JAMA Intern Med. 2016;176(9):1410. doi:10.1001/jamainternmed.2016.4753.
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To the Editor In a recent issue of JAMA Internal Medicine, Dr Plante and colleagues reported on the accuracy of the Instant Blood Pressure (IBP) app.1 We identified misrepresentations and deficiencies in how the study and its analysis were conducted. Here we present our observations for consideration.

The authors failed to disclose that approximately 20% of their data were associated with reference blood pressures outside IBP’s supported measurement range. As published on the website2 (data not peer reviewed) and App Store description prior to the start of the authors’ data collection, IBP will not produce estimates outside of its supported range (systolic, 102-158 mm Hg; diastolic, 65-99 mm Hg). We believe the authors’ failure to disclose or mention IBP’s supported range misled readers.

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September 1, 2016
Timothy B. Plante, MD, MHS; Lawrence J. Appel, MD, MPH; Seth S. Martin, MD, MHS
1Division of General Internal Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland
1Division of General Internal Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland2Welch Center for Prevention, Epidemiology and Clinical Research, 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, Maryland3Ciccarone 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.
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