cuffless differential blood pressure estimation using smart phones

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Cuffless Differential Blood Pressure Estimation Using Smart Phones Vikram Chandrasekaran, Ram Dantu,Srikanth Jonnada, Shanti Thiyagaraja, and Kalyan Pathapati Subbu IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 60, NO. 4, APRIL 2013

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Smart phones today have become increasingly popular with the general public for their diverse functionalities such as navigation, social networking, and multimedia facilities. These phones are equipped with high-end processors, high-resolution cameras, and built-in sensors such as accelerometer, orientationsensor, and light-sensor. According to comScore survey, 26.2% of U.S. adults use smart phones in their daily lives. Motivated by this statistic and the diverse capability of smart phones, we focus on utilizing them for biomedical applications. We present a new application of the smart phone with its built-in camera and microphone replacing the traditional stethoscope and cuff-based measurement technique, to quantify vital signs such as heart rate and blood pressure. We propose two differential blood pressure estimating techniques using the heartbeat and pulse data. The first method uses two smart phoneswhereas the second method replaces one of the phones with a customized external microphone. We estimate the systolic and diastolic pressure in the two techniques by computing the pulse pressure and the stroke volume from the data recorded. By comparing the estimated blood pressure values with those measured using a commercial blood pressure meter, we obtained encouraging results of 95–100% accuracy.

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Page 1: Cuffless differential blood pressure estimation using smart phones

Cuffless Differential Blood Pressure Estimation Using

Smart PhonesVikram Chandrasekaran, Ram Dantu,Srikanth Jonnada,

Shanti Thiyagaraja, and Kalyan Pathapati Subbu

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 60, NO. 4, APRIL 2013

Page 2: Cuffless differential blood pressure estimation using smart phones

Overview

Page 3: Cuffless differential blood pressure estimation using smart phones

Proposed work

Page 4: Cuffless differential blood pressure estimation using smart phones

Outline

• Methodology• Internetworking of Components• Mathematical Analysis• Results

Page 5: Cuffless differential blood pressure estimation using smart phones

Methodology

• Setup of Two Mobiles for Blood Pressure Estimation

• Setup of Single Mobile Phone for Blood Pressure Estimation

Page 6: Cuffless differential blood pressure estimation using smart phones

Setup of Two Mobiles for Blood Pressure Estimation

Page 7: Cuffless differential blood pressure estimation using smart phones

Setup of Two Mobiles for Blood Pressure

Estimation(Contd.)

RTT= T’s–Ts

Tt=RTT/2

Ot=Ts-(Tr-Tt)

Page 8: Cuffless differential blood pressure estimation using smart phones

Setup of Single Mobile Phone for Blood Pressure

Estimation

Page 9: Cuffless differential blood pressure estimation using smart phones

Outline

• Methodology• Internetworking of

Components• Mathematical Analysis• Results

Page 10: Cuffless differential blood pressure estimation using smart phones

Internetworking of Components

• Location of Heart Beat

Page 11: Cuffless differential blood pressure estimation using smart phones

Internetworking of Components• Pulse Detection and Hear Rate

Calculation

Page 12: Cuffless differential blood pressure estimation using smart phones

Internetworking of Components

• Integration of Components

Page 13: Cuffless differential blood pressure estimation using smart phones
Page 14: Cuffless differential blood pressure estimation using smart phones

Identification of Peaks

Page 15: Cuffless differential blood pressure estimation using smart phones

Outline

• Methodology• Internetworking of

Components• Mathematical Analysis• Results

Page 16: Cuffless differential blood pressure estimation using smart phones

Mathematical Analysis

• Systolic PressurePs = −0.425×VTT+214

• Pulse Pressure and Stroke volume

Pp =SV/(0.013 × Wt − 0.007 × age −.004× HR) + 1.307

• Diastolic Pressure Pd = Ps − Pp

Page 17: Cuffless differential blood pressure estimation using smart phones

Outline

• Methodology• Internetworking of

Components• Mathematical Analysis• Results

Page 18: Cuffless differential blood pressure estimation using smart phones

Results

Page 19: Cuffless differential blood pressure estimation using smart phones

Limitations

• Video intensity is very native without much filtering

• Device incompatibilities most likely occur

• Requires use of rooted phones• Measurement may not be possible in

public.• subject needs to be sitting up right

with the arm holding the camera in level to the heart.

Page 20: Cuffless differential blood pressure estimation using smart phones

Future work

• Identifying incorrect holding of phone and instructing a proper way by mobile.

• Real-time filtering of audio heart sounds

• Using more reliable sources.

Page 21: Cuffless differential blood pressure estimation using smart phones

Conclusion

• Show better performances• Accuracies between 95-100%• Using Smartphones• Well for using in normal and

nonpathological cases.• Not affected by age, height &

weight.

Page 22: Cuffless differential blood pressure estimation using smart phones

Thank You