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

Overview

Proposed work

Outline

• Methodology• Internetworking of Components• Mathematical Analysis• Results

Methodology

• Setup of Two Mobiles for Blood Pressure Estimation

• Setup of Single Mobile Phone for Blood Pressure Estimation

Setup of Two Mobiles for Blood Pressure Estimation

Setup of Two Mobiles for Blood Pressure

Estimation(Contd.)

RTT= T’s–Ts

Tt=RTT/2

Ot=Ts-(Tr-Tt)

Setup of Single Mobile Phone for Blood Pressure

Estimation

Outline

• Methodology• Internetworking of

Components• Mathematical Analysis• Results

Internetworking of Components

• Location of Heart Beat

Internetworking of Components• Pulse Detection and Hear Rate

Calculation

Internetworking of Components

• Integration of Components

Identification of Peaks

Outline

• Methodology• Internetworking of

Components• Mathematical Analysis• Results

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

Outline

• Methodology• Internetworking of

Components• Mathematical Analysis• Results

Results

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.

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.

Conclusion

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

nonpathological cases.• Not affected by age, height &

weight.

Thank You