WO2007095578A3 - Rapid thermal detection of cardiac output change - Google Patents

Rapid thermal detection of cardiac output change Download PDF

Info

Publication number
WO2007095578A3
WO2007095578A3 PCT/US2007/062141 US2007062141W WO2007095578A3 WO 2007095578 A3 WO2007095578 A3 WO 2007095578A3 US 2007062141 W US2007062141 W US 2007062141W WO 2007095578 A3 WO2007095578 A3 WO 2007095578A3
Authority
WO
WIPO (PCT)
Prior art keywords
cardiac output
therapy
response
tachyarrhythmia
delivery
Prior art date
Application number
PCT/US2007/062141
Other languages
French (fr)
Other versions
WO2007095578A2 (en
Inventor
Sourav Bhunia
Original Assignee
Medtronic Inc
Sourav Bhunia
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 Medtronic Inc, Sourav Bhunia filed Critical Medtronic Inc
Publication of WO2007095578A2 publication Critical patent/WO2007095578A2/en
Publication of WO2007095578A3 publication Critical patent/WO2007095578A3/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/026—Measuring blood flow
    • A61B5/0275—Measuring blood flow using tracers, e.g. dye dilution
    • A61B5/028—Measuring blood flow using tracers, e.g. dye dilution by thermo-dilution
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/3621—Heart stimulators for treating or preventing abnormally high heart rate
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
    • A61N1/36514—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3925—Monitoring; Protecting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3956—Implantable devices for applying electric shocks to the heart, e.g. for cardioversion
    • A61N1/3962—Implantable devices for applying electric shocks to the heart, e.g. for cardioversion in combination with another heart therapy
    • A61N1/39622—Pacing therapy
    • 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
    • A61B5/7271—Specific aspects of physiological measurement analysis
    • A61B5/7285—Specific aspects of physiological measurement analysis for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
    • A61N1/36514—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure
    • A61N1/36571—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure controlled by blood flow rate, e.g. blood velocity or cardiac output

Abstract

An improved method and apparatus for measuring changes in blood flow, particularly in the context of an automatic arrhythmia treatment device. The invention may employ a flow sensor which is activated in response to detection of a tachyarrhythmia or in response to delivery of an anti-tachyarrhythmia therapy. If activated in response to detection of tachyarrhythmia, the flow sensor may be employed to determine whether a substantial drop in cardiac output has or has not occurred, in order to select an appropriate therapy, in particular to avoid unnecessary delivery of high level shocks. If activated in response to delivery of an anti-tachyarrhythmia therapy, the flow sensor may be employed to determine whether the therapy was or was not successful in correcting a low cardiac output or whether a reduced cardiac output followed delivery of the therapy.
PCT/US2007/062141 2006-02-15 2007-02-14 Rapid thermal detection of cardiac output change WO2007095578A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77345806P 2006-02-15 2006-02-15
US60/773,458 2006-02-15

Publications (2)

Publication Number Publication Date
WO2007095578A2 WO2007095578A2 (en) 2007-08-23
WO2007095578A3 true WO2007095578A3 (en) 2008-01-10

Family

ID=38180306

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/062141 WO2007095578A2 (en) 2006-02-15 2007-02-14 Rapid thermal detection of cardiac output change

Country Status (1)

Country Link
WO (1) WO2007095578A2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174299A (en) * 1991-08-12 1992-12-29 Cardiac Pacemakers, Inc. Thermocouple-based blood flow sensor
US5316001A (en) * 1990-09-11 1994-05-31 Ferek Petric Bozidar Cardiac measurement system for measuring blood flow velocity by use of a sensor implanted inside the heart
US20020115940A1 (en) * 2000-04-28 2002-08-22 Medtronic, Inc. Ischemic heart disease detection
US20020188215A1 (en) * 2001-04-30 2002-12-12 Bozidar Ferek-Petric Methods for adjusting cardiac detection criteria and implantable medical devices using same
EP1614446A2 (en) * 1995-10-25 2006-01-11 Galvani Ltd. Electrically forcing cardiac output temporarily in tachycardia patients

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5316001A (en) * 1990-09-11 1994-05-31 Ferek Petric Bozidar Cardiac measurement system for measuring blood flow velocity by use of a sensor implanted inside the heart
US5174299A (en) * 1991-08-12 1992-12-29 Cardiac Pacemakers, Inc. Thermocouple-based blood flow sensor
EP1614446A2 (en) * 1995-10-25 2006-01-11 Galvani Ltd. Electrically forcing cardiac output temporarily in tachycardia patients
US20020115940A1 (en) * 2000-04-28 2002-08-22 Medtronic, Inc. Ischemic heart disease detection
US20020188215A1 (en) * 2001-04-30 2002-12-12 Bozidar Ferek-Petric Methods for adjusting cardiac detection criteria and implantable medical devices using same

Also Published As

Publication number Publication date
WO2007095578A2 (en) 2007-08-23

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