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An iPhone Application for Blood Pressure Monitoring via the Oscillometric Finger Pressing Method

Penelitian - High blood pressure (BP) is a major, modifiable cardiovascular risk factor, yet hypertension awareness and control rates are low. Ubiquitous BP monitoring could improve these rates, but existing devices require inflatable cuffs and thus do not afford such monitoring.

Ramakrishna Mukkamala of the Michigan State University and colleagues developed a smartphone application that leverages PPG and force sensors already in the phone to implement the oscillometric finger pressing method. They tested the application against cuff BP measurements for a proof-of-concept demonstration.

Penelitian An iPhone Application for Blood Pressure Monitoring via the Oscillometric Finger Pressing Method

The method represents an extension of the time-honored oscillometric cuff BP measurement principle. The idea is for the user to serve as the actuator by pressing fingertip against the phone to steadily increase the external pressure of the underlying artery.

While the phone, embedded with photo-plethysmography (PPG) and force transducers, serves as the sensor to measure the resulting variable-amplitude blood volume oscillations and applied pressure. The phone also visually guides the finger actuation and then computes BP from the measurements just like a cuff device.

“We developed an iPhone X application to measure blood pressure (BP) via the oscillometric finger pressing method. The user presses her fingertip on both the front camera and screen to increase the external pressure of the underlying artery,” said Mukkamala.

“The resulting variable-amplitude blood volume oscillations via the camera and applied pressure via the strain gauge array under the screen. The application also visually guides the fingertip placement and actuation and then computes BP from the measurements just like many automatic cuff devices,” Mukkamala said.



The application yielded bias and precision errors of −4.0 and 11.4 mmHg for systolic BP and −9.4 and 9.7 mmHg for diastolic BP (n = 18). These errors were near the finger cuff device errors. This proof-of-concept study surprisingly indicates that cuff-less and calibration-free BP monitoring may be feasible with many existing and forthcoming smartphones.

Journal : Anand Chandrasekhar et al. An iPhone Application for Blood Pressure Monitoring via the Oscillometric Finger Pressing Method, Scientific Reports, 03 September 2018, DOI:10.1038/s41598-018-31632-x

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