portable ecg collection system james cook joe konwinski carmen hayes mentor: dr. mingui sun march 15...
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Portable ECG Collection System James Cook Joe Konwinski Carmen Hayes Mentor: Dr. Mingui Sun March 15 st 2005. Outline. Introduction My Focus Specific Aims What is left to do?. Introduction. Develop a small device that can: Cleanly amplify the electric activity of the heart - PowerPoint PPT PresentationTRANSCRIPT
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Portable ECG Collection SystemJames CookJoe KonwinskiCarmen Hayes
Mentor: Dr. Mingui SunMarch 15st 2005
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Outline
• Introduction
• My Focus
• Specific Aims
• What is left to do?
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Introduction• Develop a small device that can:
• Cleanly amplify the electric activity of the heart• Save the amplified signal onto flash memory
• Produce a program that can:• Analyze the ECG data and give heart-risk feedback
to the user
• Be sold over-the-counter• Be user-friendly and safe• Purpose: Assess heart risk of seemingly
healthy middle to upper aged individuals
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My Focus
• Research methods of diagnosing heart disease via ECG
• Research ECG analysis algorithms
• Develop analysis software
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Specific Aim I
ECG System:
• Normally has 12 leads, each one takes a “picture” of the heart from a different aspect.
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Specific Aim I
• We will be using only 1 electrode, so a location must be chosen that collects all key parts of the waveform adequately
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Specific Aim I
ECG and Heart Disease• Heart Block
• Electrical pathway from Atria to Ventricles is impaired or severed entirely
• Non-consequential or very serious depending on its extent
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Specific Aim I
ECG and Heart Disease• Heart Block
•1st Degree: P-R interval > 0.2 sec•2nd Degree: Occasional lacking of
QRS wave•3rd Degree: P and QRS waves are not
coupled at all•Also Bundle Branch Block, but it’s less consequential and more difficult to diagnose
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Specific Aim I
ECG and Heart Disease• Arrhythmia
• Heart Rate less than 60 or more than 100 BPM
• Periodic beat-to-beat change in P-R interval
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Specific Aim II
Analyzing the ECG Waveform
• Normally done via human interpretation
• Few programmatic methods in existence
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Specific Aim II
Analyzing the ECG Waveform• Triangle transformationuses statistics to pick outimportant parts of the waveform.
• Somewhat complicated and probably unnecessary
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Specific Aim III
Analysis Software Development
• Preliminary data collected at 240 Hz with the amplifier.
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Specific Aim III
Analysis Software Development• Data was imported
using LabVIEW.• Baseline was
calculated using a moving average filter in intervals of 1 sec.
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Specific Aim III
Analysis Software Development
• Baseline was subtracted and data was filtered to remove high-frequency noise
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Specific Aim III
Analysis Software Development• Peak detector algorithm run to find
locations of peaks (and valleys) as well as their amplitudes, 1st, 2nd, and 3rd derivatives
ST
R??
Q
P + noise
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Specific Aim III
Analysis Software Development• Groups of data were found using an edge
detection algorithm, which will be used to isolate important parts of the waveform
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Specific Aim III
Analysis Software Development• Once peaks are identified, analyzing
timing is simple!• For instance, Joe’s resting heart-rate is 78
BPM (no stethoscope required)
• This will be useful in diagnosing the aforementioned diseases and many others
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What’s Left?
• More preliminary testing
• Perfect the software
• Flash memory
• Complete business plan
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Questions??
Data Collection at 240 Hz:
uncompressed compressed
1 minute: 140 KB 20 KB
1 hour: 8,400 KB 1,200 KB
1 day: 201,600 KB 28,800 KB 8+ days with 256 MB chip!