Abstract
We present a novel smartwatch, CareUp, for estimating the Blood Pressure (BP) in real time. It consists of two pulse oximeters: one placed on the back and one on the front of the device. Placing the index finger on the front oximeter starts the acquisition of two photoplethysmograms (PPG); the signals are then filtered and cross-correlated to obtain a Time Delay between them, called Pulse Transit Time (PTT). The Heart Rate (HR) (estimated from the finger PPG) and the PTT are then input in a linear model to give an estimation of the Systolic and Diastolic BP. The performance of the smartwatch in measuring BP have been validated in the Institut Coeur Paris Centre Turin (ICPC), using a sphygmomanometer, on 44 subjects. During the validation, the measures of the CareUp were compared to those of two oscillometry-based devices already available on the market: Thuasne and Magnien. The results showed an accuracy comparable to the oscillometry-based devices and they almost agreed with the American Association for the Advancement of Medical Instrumentation standard for non-automated sphygmomanometers. The integration of the BP estimation algorithm in the smartwatch makes the CareUp an easy-to-use, wearable device for monitoring the BP in real time.
Highlights
IntroductionA normal Systolic Blood Pressure (SBP) is below 120 mmHg and a normal Diastolic Blood
A normal Systolic Blood Pressure (SBP) is below 120 mmHg and a normal Diastolic BloodPressure (DBP) is lower than 80 mmHg
The results put in evidence that there is no significant difference in the SBP measurement using market available devices and the CareUp R
Summary
A normal Systolic Blood Pressure (SBP) is below 120 mmHg and a normal Diastolic Blood. Pressure (DBP) is lower than 80 mmHg. Raised Blood Pressure (BP) throughout its range is the most significant cause of death and disability in the world [1]. In the USA, about 30% of the population suffers from hypertension and less than 50% of them monitor their BP [2]. Increased pressure in the arteries is a common condition, leading to hypertensive heart disease and Cardiovascular Diseases (CVD). Accurate BP measurement is, vital in the prevention and treatment of such diseases, especially in hypertensive patients. Even if the BP is high, the patient probably will not have any symptoms: The first symptom of untreated high BP may be a heart attack, stroke or kidney damage
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