CA2118930A1 - Methods of impedance cardiography and heartbeat determination - Google Patents

Methods of impedance cardiography and heartbeat determination

Info

Publication number
CA2118930A1
CA2118930A1 CA002118930A CA2118930A CA2118930A1 CA 2118930 A1 CA2118930 A1 CA 2118930A1 CA 002118930 A CA002118930 A CA 002118930A CA 2118930 A CA2118930 A CA 2118930A CA 2118930 A1 CA2118930 A1 CA 2118930A1
Authority
CA
Canada
Prior art keywords
stroke volume
processed
thoracic impedance
identify
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002118930A
Other languages
French (fr)
Other versions
CA2118930C (en
Inventor
Xiang Wang
Hun H. Sun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NONINVASIVE MEDICAL TECHNOLOGIES LLC
Original Assignee
Xiang Wang
Hun H. Sun
Drexel University
Noninvasive Medical Technologies, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiang Wang, Hun H. Sun, Drexel University, Noninvasive Medical Technologies, Llc filed Critical Xiang Wang
Publication of CA2118930A1 publication Critical patent/CA2118930A1/en
Application granted granted Critical
Publication of CA2118930C publication Critical patent/CA2118930C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/053—Measuring electrical impedance or conductance of a portion of the body
    • A61B5/0535—Impedance plethysmography
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/7239—Details of waveform analysis using differentiation including higher order derivatives
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/7253—Details of waveform analysis characterised by using transforms
    • A61B5/7257—Details of waveform analysis characterised by using transforms using Fourier transforms

Abstract

Thoracic impedance (22, 23) and EKG signals (25a, 25b) are processed for improved resolution and accuracy. EKG
signals are adaptively processed (26, 28) by digitizing, filtering, differentiating and raising the resultant differential by a power greater than one to emphasize changes in the slope. Blocks of the processed EKG data are analyzed (30) to identify peak amplitude and to compare spacing between peak amplitudes to more accurately identify R
wave peaks. Stroke volume is determined from a thoracic impedance signal and its time derivative. Preferably, a time-frequency distribution is taken of the time derivative thoracic impedance signal after low- and high-pass filtering to identify B and X wave events which are used to determine ventricular ejection time and dZ/dt min for heart stroke volume determination by conventional methods. Alternatively, stroke volume is determined by a new relationship between a product of a pair of impedances simultaneously sensed on opposing sides of a heart at the heartbeat's peak.
CA002118930A 1991-09-12 1992-09-11 Methods of impedance cardiography and heartbeat determination Expired - Lifetime CA2118930C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US75803491A 1991-09-12 1991-09-12
US07/758,034 1991-09-12
USCIP07/834,425 1992-02-12
US07/834,425 US5309917A (en) 1991-09-12 1992-02-12 System and method of impedance cardiography and heartbeat determination
PCT/US1992/007756 WO1993004627A1 (en) 1991-09-12 1992-09-11 Methods of impedance cardiography and heartbeat determination

Publications (2)

Publication Number Publication Date
CA2118930A1 true CA2118930A1 (en) 1993-03-18
CA2118930C CA2118930C (en) 2004-02-10

Family

ID=27116481

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002118930A Expired - Lifetime CA2118930C (en) 1991-09-12 1992-09-11 Methods of impedance cardiography and heartbeat determination

Country Status (7)

Country Link
US (2) US5309917A (en)
EP (1) EP0606301B1 (en)
JP (1) JPH07503380A (en)
AT (1) ATE209873T1 (en)
CA (1) CA2118930C (en)
DE (1) DE69232267T2 (en)
WO (1) WO1993004627A1 (en)

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