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Blood Pressure Measurement Based on the Camera and Inertial Measurement Unit of a Smartphone: Instrument Validation
Yong-Hoon Yoon1, Jongin Kim2, Kwang Jin Lee2
1Chungnam National University Sejong Hospital, Sejong-Si, Republic of Korea.
JMIR Mhealth and Uhealth
|September 11, 2023
Summary
The AlwaysBP mobile app demonstrated acceptable accuracy in measuring systolic and diastolic blood pressure compared to traditional cuff methods. Further validation is needed, but this technology could increase hypertension awareness.
Area of Science:
- Biomedical Engineering
- Cardiovascular Technology
- Mobile Health
Background:
- Limited data exists on the accuracy of mobile apps for blood pressure measurement.
- Existing mobile health solutions require further validation for clinical use.
Purpose of the Study:
- To assess the accuracy of the AlwaysBP smartphone application for blood pressure measurement.
- To compare AlwaysBP's performance against the standard cuff-based manual method.
Main Methods:
- AlwaysBP estimates blood pressure using pulse transit time (PTT) derived from smartphone sensors (camera, inertial measurement unit).
- PTT was calculated using photoplethysmogram and seismocardiogram signals.
- Systolic (SBP) and diastolic (DBP) blood pressures were estimated using established equations, with calibration performed for each participant.
Main Results:
- The study included 87 participants (52% male, average age 35.6 years), with 16% having pre-existing hypertension.
- Mean SBP difference between AlwaysBP and the reference method was 1.2 mm Hg (SD 7.1), with 84.3% of measurements within 10 mm Hg.
- Mean DBP difference was -1.0 mm Hg (SD 6.0), with 93.9% of measurements within 10 mm Hg.
Conclusions:
- AlwaysBP shows acceptable accuracy for SBP and DBP measurement against standard methods, meeting specific protocol criteria.
- Further validation using protocols designed for cuffless devices is recommended for clinical accuracy assessment.
- The technology's ease of use may enhance public awareness of hypertension and aid in its management.
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