1 portable heart attack detector (phad) characterization presentation april 6, 2005 technion –...
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Portable HeartPortable HeartAttack DetectorAttack Detector
(PHAD)(PHAD)Characterization PresentationCharacterization Presentation
April 6, 2005April 6, 2005
Technion – Israel Institute of TechnologyDepartment of Electrical Engineering
High-Speed Digital Systems Lab
SupervisorSupervisorDaniel AlkalayDaniel Alkalay
System architecturesSystem architecturesNir GluzmanNir GluzmanAlexei IolinAlexei Iolin
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Did You Know?Did You Know?More than 1.2 million Americans will suffer a heart attack, where about 502,000 of these people will die!340,000 of them in an ER or BEFORE they reach a hospital.
Surviving a heart attack depends on the treatment that is given within the first hour of the heart attack.
Most common reason for treatment delay is patient unawareness.
Source: American Heart Association, 2004 estimation.
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AGENDAAGENDAMedical Background
Project Objective
System Block Diagram
NI/FPGA – Pros & Cons
Project Time-Table
Summary
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Medical BackgroundMedical BackgroundECG = Electrocardiogram
Recording of heart’s electrical activity.
Measures rate and regularity.
Used to diagnose diseases.
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Heart attack(Myocardial Infarction)
An event that results in permanent damage to the heart.
myocardium = heart muscle.
infarct = die.
Medical Background Medical Background (cont.)(cont.)
Q-waves and inverted T-waves are two diagnostic wave forms seen in old heart attacks and new heart attacks respectively.
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ST-Elevation (STEMI)Elevation of ST-segment relative to PR or TP segment.
ST-elevation is a sign for coming heart attack (acute myocardial infarction).
Short PR interval - very difficult for computer algorithms to find the isoelectric reference level.
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Develop a system that measures and displays Develop a system that measures and displays RR-RR-raterate, , ST-elevationST-elevation and and alert to wide-QRSalert to wide-QRS..
Implement the system on National-InstrumentImplement the system on National-Instrument (*)(*) Real-Time FPGA development environment using Real-Time FPGA development environment using LabView graphical language. LabView graphical language.
Project ObjectiveProject Objective
(*)(*) website: http://ni.com
PXI-7831R
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System Block DiagramSystem Block DiagramBiosensors
A/D interface
Detection of ECG characteristic pointswith filter-bank
Detection ofRR-rate, ST-elevation, wide-QRS
Abnormalitiesalert
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Filter-Bank Block DiagramFilter-Bank Block Diagram
Input signal is sampled at 360Hz.Input signal is sampled at 360Hz.
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Abnormalities detectionAbnormalities detection(cont.)(cont.)
RR-rate &wide-QRSdetection
ST-elevationdetection
R-detectionDecomposed
Signal
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Abnormalities detectionAbnormalities detection(cont.)(cont.)
R-detection RR-rate & QRS-duration
ST-elevation
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NI/FPGA – Pros & ConsNI/FPGA – Pros & Cons
ProsRapid prototype system.Dedicated hardware and software.
ConsNI development environment is non-conventional – design extraction to other non NI/FPGA environments is NOT possible.VHDL code is hidden from user.
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Project Time-TableProject Time-Table
Study of NI/FPGA & LabView development environment
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Implementation 5
Design verification 2
Limited clinical experiments (optional) 1
Final report and project summary 2
SubjectTime period
(weeks)
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Summary
Patient need for PHAD.
Detailed design of the system.
Pros & cons of NI development environment.