Mentor: Prof. K. Mani Chandy Co-Mentor: Dr. Julian BunnBy: Victor Chu & Aleksander PalatnikOctober 2009

Who Supported Us

Modern Medicine

Stethoscope

Electrocardiogram

Objectives

Platform

Stethoscope & Results

Electrocardiogram & Results

Future Plans

Acknowledgments & References

Infospheres Group◦ Sense and Respond◦ Prof. K Mani Chandy◦ Projects include:

Virtual Environments for Radiation Detection The Event Driven Web Personal Monitors

Dr. Julian Bunn Prof. Chanhuei Yang

Expensive Devices◦ Spirometer

Device: $10 - $500+◦ Echocardiograms (Ultrasound)

Procedure + Interpretation: $250 - $600 ◦ Electrocardiogram

Device: $300 - $1500 Procedure + Interpretation: $30 - $60

◦ Stethoscope Device: $1 - $300 Procedure + Interpretation: $45 - $80

Preliminary Screening

Auscultationo Measurement and interpretation of

heart sounds

o A bell with a diaphragm amplifies the audio produced by blood moving within the heart

o 1-3Hz signal from heart beato Higher frequencies from turbulence (Murmurs)

Transthoracic interpretation of electrical activity of the heart

Multiple Leads – Can be 3, 5, 12, etc. High Pass Filter 1 Hz Low Pass Filter 40 Hz

Connecting Medical Devices to Cell phones◦ Cell phones are ubiquitous◦ Powerful processors◦ Ability to transmit data

Stethoscope◦ Inexpensive and simple device◦ Can indicate many heart problems

Electrocardiogram◦ Relatively inexpensive platform◦ Extremely valuable diagnostic tool

G1 Google Android phone (HTC Dream)◦ Developer’s Edition◦ Java◦ Android Emulator

Samsung SGH-A737◦ Testing Purposes

Littman Stethoscope $50 - $300

Budget Stethoscope $1 - $5

3M Poster Strips Used to create a seal between

stethoscope and microphone Strip of foam with adhesive

on both sides

Stethoscope Recording Performed several recordings using a built-in laptop

microphone with the Audacity program Applied noise-reduction, amplification Low-cost stethoscope:

Littmann stethoscope:

Peak-finding algorithm Time-domain only Based on Envelope Peak determination

by variable thresholding

Median Filter Looking between

peaks yields murmur level

Functional up to medium-severity murmur

Passive Analog Circuit◦ 9 Volt Battery Power Source◦ 400x amplification◦ Analog output

3 Leads◦ Body◦ 2 Signal

Pre–1984 Pennies + Lotion◦ Copper

Q-Trace Electrodes

Laptop Results◦ Audacity◦ High Pass Filter 1 Hertz, Low Pass Filter 40 Hertz

Waves identifiable◦ P, Q, R, S components

visible◦ T Wave not visible

Develop software for stethoscope System◦ Migrate code to cellular phone system◦ Improve artifact resistance◦ Improve pathology detection

Develop better hardware for ECG system◦ Stabilize system◦ Implement more efficient designs◦ Minimize costs

Prof. K. Mani Chandy Dr. Julian Bunn Dr. Danny Petrasek Prof. Al Barr Prof. Chanhuei Yang Surf Office

Thank You and Have a good summer!

Victor ChuAleks Palatnik

[1] "Spirometry." Wikipedia, The Free Encyclopedia. 14 Sep 2009, 13:30 UTC. 14 Sep 2009 <http://en.wikipedia.org/w/index.php?title=Spirometry&oldid=313847691>.

[2] "Angiography." Wikipedia, The Free Encyclopedia. 24 Sep 2009, 23:14 UTC. 24 Sep 2009 <http://en.wikipedia.org/w/index.php?title=Angiography&oldid=316017407>.

[3] Cardiac electrophysiology. (2009, September 24). In Wikipedia, The Free Encyclopedia. Retrieved 01:40, September 24, 2009, from http://en.wikipedia.org/w/index.php?title=Cardiac_electrophysiology&oldid=315827127

[4] "Stethoscope." Wikipedia, The Free Encyclopedia. 20 Sep 2009, 20:36 UTC. 20 Sep 2009 <http://en.wikipedia.org/w/index.php?title=Stethoscope&oldid=315161008>.\

[5] "Aortic aneurysm." Wikipedia, The Free Encyclopedia. 14 Sep 2009, 23:17 UTC. 14 Sep 2009 <http://en.wikipedia.org/w/index.php?title=Aortic_aneurysm&oldid=313989527>.

[6] "The Stethoscope - Essential Medical Equipment." Information and Advice for Medical Students: Stethoscope. 24 Sep 2009 <http://www.davidgregory.org/medical/stethoscope.htm>.

[7] "The Ultimate Acoustic Stethoscope Review." The Consumer Magazine For Doctors. 24 Sep 2009 <http://www.forusdocs.com/reviews/Acoustic_Stethoscope_Review.htm> .

[8] "Electrocardiography." Wikipedia, The Free Encyclopedia. 24 Sep 2009, 14:21 UTC. 24 Sep 2009 <http://en.wikipedia.org/w/index.php?title=Electrocardiography&oldid=315919139>.

[9] "Homemade Electrocardiograph." Homemade Electrocardiograph. 24 Sep 2009<http://www.eng.utah.edu/~jnguyen/ecg/ecg_index.html> .

[10] “Cost of Services” Harvard Pilgrim Health Care. 16 Oct 2009. 16 Oct 2009<https://www.harvardpilgrim.org/portal/page?_pageid=253,192924&_dad=portal&_schema=PORTAL>

[11] “EKG Machines” Medical Device Depot Inc. 16 Oct 2009. 16 Oct 2009<http://www.medicaldevicedepot.com/EKG-Machines-s/70.htm>