CA2033765A1 - Variation in cardiac chamber volume or pressure as a controlling parameter - Google Patents

Variation in cardiac chamber volume or pressure as a controlling parameter

Info

Publication number
CA2033765A1
CA2033765A1 CA2033765A CA2033765A CA2033765A1 CA 2033765 A1 CA2033765 A1 CA 2033765A1 CA 2033765 A CA2033765 A CA 2033765A CA 2033765 A CA2033765 A CA 2033765A CA 2033765 A1 CA2033765 A1 CA 2033765A1
Authority
CA
Canada
Prior art keywords
pressure
versus time
variation
respiratory
chamber volume
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
CA2033765A
Other languages
French (fr)
Other versions
CA2033765C (en
Inventor
Brian D. Pederson
Rodney W. Salo
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.)
Cardiac Pacemakers Inc
Original Assignee
Cardiac Pacemakers Inc
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 Cardiac Pacemakers Inc filed Critical Cardiac Pacemakers Inc
Publication of CA2033765A1 publication Critical patent/CA2033765A1/en
Application granted granted Critical
Publication of CA2033765C publication Critical patent/CA2033765C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • A61N1/36521—Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure the parameter being derived from measurement of an electrical impedance
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2218/00—Aspects of pattern recognition specially adapted for signal processing

Abstract

A rate adaptive cardiac pacer is described in which the impedance versus time information derived using impedance plethysmography or the pressure versus time information derived from a pressure transducer in a ventricular chamber is signal processed to recover a modulating envelope due to volume or pressure changes occasioned by respiratory activity. Either or both of the respiratory interval or respiratory depth may be combined in an appropriate rate control algorithm (62) with other parameters also derived from the impedance versus time signal to develop a rate control signal (64) for an implanted pacer. <IMAGE>
CA002033765A 1990-03-08 1991-01-08 Variation in cardiac chamber volume or pressure as a controlling parameter Expired - Fee Related CA2033765C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49039290A 1990-03-08 1990-03-08
US07/490,392 1990-03-08

Publications (2)

Publication Number Publication Date
CA2033765A1 true CA2033765A1 (en) 1991-09-09
CA2033765C CA2033765C (en) 1999-10-19

Family

ID=23947852

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002033765A Expired - Fee Related CA2033765C (en) 1990-03-08 1991-01-08 Variation in cardiac chamber volume or pressure as a controlling parameter

Country Status (6)

Country Link
US (2) US5137019A (en)
EP (1) EP0449401B1 (en)
JP (1) JP2551696B2 (en)
AT (1) ATE151299T1 (en)
CA (1) CA2033765C (en)
DE (1) DE69125517T2 (en)

Families Citing this family (115)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5374282A (en) * 1991-10-31 1994-12-20 Medtronic, Inc. Automatic sensitivity adjust for cardiac pacemakers
US5324326A (en) * 1991-11-25 1994-06-28 Telectronics Pacing Systems, Inc. Pressure sensing pacing lead
DE59209407D1 (en) * 1992-08-26 1998-08-13 Pacesetter Ab Pacemaker for generating a signal corresponding to a patient's respiratory volume
DE4231602B4 (en) * 1992-09-17 2004-11-04 Biotronik Meß- und Therapiegeräte GmbH & Co. Ingenieurbüro Berlin Circuit for measuring the impedance in the heart
SE9202937D0 (en) * 1992-10-07 1992-10-07 Siemens Elema Ab FREQUENCY ADAPTIVE HEART STIMULATOR
US5566096A (en) * 1992-11-13 1996-10-15 Quinton Electrophysiology Corporation Integrated electrical signal switching and amplifying system
US5383911A (en) * 1993-01-29 1995-01-24 Siemens Pacesetter, Inc. Rate-responsive pacemaker having selectable response to arm movement and pedal impacts
US5318597A (en) * 1993-03-15 1994-06-07 Cardiac Pacemakers, Inc. Rate adaptive cardiac rhythm management device control algorithm using trans-thoracic ventilation
WO1994022367A1 (en) * 1993-03-30 1994-10-13 Pfizer Inc. Radiotelemetry impedance plethysmography device
US5376106A (en) * 1993-10-18 1994-12-27 Cardiac Pacemakers, Inc. Multi-sensor blending in a rate responsive cardiac pacemaker
US5485849A (en) * 1994-01-31 1996-01-23 Ep Technologies, Inc. System and methods for matching electrical characteristics and propagation velocities in cardiac tissue
US5487391A (en) * 1994-01-28 1996-01-30 Ep Technologies, Inc. Systems and methods for deriving and displaying the propagation velocities of electrical events in the heart
WO1995020344A1 (en) 1994-01-28 1995-08-03 Ep Technologies, Inc. System for examining cardiac tissue electrical characteristics
WO1995020348A1 (en) * 1994-01-28 1995-08-03 Ep Technologies, Inc. Matching electrical characteristics and propagation velocities to locate ablation sites
US5577509A (en) * 1994-01-28 1996-11-26 Ep Technologies, Inc. Systems and methods for examining the electrical characteristics and timing of electrical events in cardiac tissue
US5494042A (en) * 1994-01-28 1996-02-27 Ep Technologies, Inc. Systems and methods for deriving electrical characteristics of cardiac tissue for output in iso-characteristic displays
US5409009A (en) * 1994-03-18 1995-04-25 Medtronic, Inc. Methods for measurement of arterial blood flow
US5531772A (en) * 1994-11-18 1996-07-02 Intermedics, Inc. Rate responsive cardiac pacemaker with filtered impedance sensing and method
US5507785A (en) * 1994-12-21 1996-04-16 Intermedics, Inc. Rate responsive cardiac pacemaker with biphasic impedance sensing and method
US5535752A (en) * 1995-02-27 1996-07-16 Medtronic, Inc. Implantable capacitive absolute pressure and temperature monitor system
US5503157A (en) * 1995-03-17 1996-04-02 Sramek; Bohumir System for detection of electrical bioimpedance signals
EP0957757A1 (en) 1995-09-28 1999-11-24 Data Sciences International, Inc. Respiration monitoring system based on sensed blood pressure
US6350242B1 (en) 1995-09-28 2002-02-26 Data Sciences International, Inc. Respiration monitoring system based on sensed physiological parameters
US5758652A (en) * 1995-10-19 1998-06-02 Nikolic; Serjan D. System and method to measure the condition of a patients heart
US6044294A (en) * 1995-12-15 2000-03-28 Pacesetter, Inc. Methods and apparatus for measuring impedance in the body
US5935078A (en) * 1996-01-30 1999-08-10 Telecom Medical, Inc. Transdermal communication system and method
US6208900B1 (en) * 1996-03-28 2001-03-27 Medtronic, Inc. Method and apparatus for rate-responsive cardiac pacing using header mounted pressure wave transducer
US5861018A (en) * 1996-05-28 1999-01-19 Telecom Medical Inc. Ultrasound transdermal communication system and method
US5913826A (en) * 1996-06-12 1999-06-22 K-One Technologies Wideband external pulse cardiac monitor
SE9602979D0 (en) * 1996-08-14 1996-08-14 Pacesetter Ab Pacemaker
US5713935A (en) * 1996-08-23 1998-02-03 Sulzer Intermedics Inc. Method and apparatus for monitored biphasic cardiac impedance sensing
US5722997A (en) * 1996-09-17 1998-03-03 Sulzer Intermedics Inc. Method and apparatus for cardiac impedance sensing
US6269264B1 (en) * 1996-12-13 2001-07-31 Pacesetter, Inc. Method for measuring impedance in the body
US6152954A (en) 1998-07-22 2000-11-28 Cardiac Pacemakers, Inc. Single pass lead having retractable, actively attached electrode for pacing and sensing
US6076015A (en) * 1998-02-27 2000-06-13 Cardiac Pacemakers, Inc. Rate adaptive cardiac rhythm management device using transthoracic impedance
US6314322B1 (en) 1998-03-02 2001-11-06 Abiomed, Inc. System and method for treating dilated cardiomyopathy using end diastolic volume (EDV) sensing
US6463334B1 (en) 1998-11-02 2002-10-08 Cardiac Pacemakers, Inc. Extendable and retractable lead
US6501990B1 (en) * 1999-12-23 2002-12-31 Cardiac Pacemakers, Inc. Extendable and retractable lead having a snap-fit terminal connector
US6310512B1 (en) 1999-11-22 2001-10-30 Cardiac Pacemakers, Inc. Integrated self-adjustable continuous time band pass filter based upon Gm cell with bipolar transistors
WO2000045890A1 (en) 1999-02-08 2000-08-10 Cardiac Pacemakers, Inc. Signal processing system using improved transconductance cell
US6287263B1 (en) * 1999-02-08 2001-09-11 Cardiac Pacemakers, Inc. System for processing bursted amplitude modulated signals using an impedance sensor
DE19940952A1 (en) * 1999-08-20 2001-02-22 Biotronik Mess & Therapieg Rate-adaptive pacemaker
US7483743B2 (en) * 2000-01-11 2009-01-27 Cedars-Sinai Medical Center System for detecting, diagnosing, and treating cardiovascular disease
US6328699B1 (en) * 2000-01-11 2001-12-11 Cedars-Sinai Medical Center Permanently implantable system and method for detecting, diagnosing and treating congestive heart failure
US8298150B2 (en) * 2000-01-11 2012-10-30 Cedars-Sinai Medical Center Hemodynamic waveform-based diagnosis and treatment
US6522914B1 (en) * 2000-07-14 2003-02-18 Cardiac Pacemakers, Inc. Method and apparatuses for monitoring hemodynamic activities using an intracardiac impedance-derived parameter
SE0003480D0 (en) 2000-09-27 2000-09-27 St Jude Medical Implantable heart stimulator
US7369890B2 (en) 2000-11-02 2008-05-06 Cardiac Pacemakers, Inc. Technique for discriminating between coordinated and uncoordinated cardiac rhythms
US7069070B2 (en) * 2003-05-12 2006-06-27 Cardiac Pacemakers, Inc. Statistical method for assessing autonomic balance
US6689117B2 (en) 2000-12-18 2004-02-10 Cardiac Pacemakers, Inc. Drug delivery system for implantable medical device
WO2002064205A2 (en) * 2001-02-13 2002-08-22 Quetzal Biomedical, Inc. Multi-electrode apparatus and method for treatment of congestive heart failure
DE10144442A1 (en) 2001-09-06 2003-03-27 Biotronik Mess & Therapieg Rate-adaptive pacemaker
US7340303B2 (en) * 2001-09-25 2008-03-04 Cardiac Pacemakers, Inc. Evoked response sensing for ischemia detection
US6741886B2 (en) 2001-10-25 2004-05-25 Cardiac Pacemakers, Inc. ECG system with minute ventilation detector
US20050027323A1 (en) * 2001-10-30 2005-02-03 Medtronic, Inc. Implantable medical device for monitoring cardiac blood pressure and chamber dimension
US6973349B2 (en) 2001-12-05 2005-12-06 Cardiac Pacemakers, Inc. Method and apparatus for minimizing post-infarct ventricular remodeling
US6957105B2 (en) * 2002-03-26 2005-10-18 Cardiac Pacemakers, Inc. Method and apparatus for detecting oscillations in cardiac rhythm with electrogram signals
US7039462B2 (en) * 2002-06-14 2006-05-02 Cardiac Pacemakers, Inc. Method and apparatus for detecting oscillations in cardiac rhythm
US7113825B2 (en) * 2002-05-03 2006-09-26 Cardiac Pacemakers, Inc. Method and apparatus for detecting acoustic oscillations in cardiac rhythm
US7089055B2 (en) * 2002-06-28 2006-08-08 Cardiac Pacemakers, Inc. Method and apparatus for delivering pre-shock defibrillation therapy
US7092757B2 (en) 2002-07-12 2006-08-15 Cardiac Pacemakers, Inc. Minute ventilation sensor with dynamically adjusted excitation current
US6965797B2 (en) * 2002-09-13 2005-11-15 Cardiac Pacemakers, Inc. Method and apparatus for assessing and treating myocardial wall stress
US7139613B2 (en) * 2002-09-25 2006-11-21 Medtronic, Inc. Implantable medical device communication system with pulsed power biasing
US7013178B2 (en) * 2002-09-25 2006-03-14 Medtronic, Inc. Implantable medical device communication system
US7072711B2 (en) 2002-11-12 2006-07-04 Cardiac Pacemakers, Inc. Implantable device for delivering cardiac drug therapy
US20040158289A1 (en) * 2002-11-30 2004-08-12 Girouard Steven D. Method and apparatus for cell and electrical therapy of living tissue
US7627373B2 (en) 2002-11-30 2009-12-01 Cardiac Pacemakers, Inc. Method and apparatus for cell and electrical therapy of living tissue
US7101339B2 (en) 2002-12-13 2006-09-05 Cardiac Pacemakers, Inc. Respiration signal measurement apparatus, systems, and methods
US7272442B2 (en) 2002-12-30 2007-09-18 Cardiac Pacemakers, Inc. Automatically configurable minute ventilation sensor
US8050764B2 (en) 2003-10-29 2011-11-01 Cardiac Pacemakers, Inc. Cross-checking of transthoracic impedance and acceleration signals
US7972275B2 (en) 2002-12-30 2011-07-05 Cardiac Pacemakers, Inc. Method and apparatus for monitoring of diastolic hemodynamics
US7200440B2 (en) 2003-07-02 2007-04-03 Cardiac Pacemakers, Inc. Cardiac cycle synchronized sampling of impedance signal
US7592909B2 (en) * 2006-01-19 2009-09-22 Board Of Regents, The University Of Texas System Location and tracking system using wireless technology
EP1660176A4 (en) * 2003-08-20 2013-11-27 Pacesetter Inc Optimization of impedance signals for closed loop programming of cardiac resynchornization therapy devices
US7320675B2 (en) 2003-08-21 2008-01-22 Cardiac Pacemakers, Inc. Method and apparatus for modulating cellular metabolism during post-ischemia or heart failure
US7392084B2 (en) * 2003-09-23 2008-06-24 Cardiac Pacemakers, Inc. Demand-based cardiac function therapy
US20050075672A1 (en) * 2003-10-06 2005-04-07 Rottenberg William B. Cardiac Stimulation Apparatus With Multiple Input Sense Amplifiers
US7572226B2 (en) * 2003-10-28 2009-08-11 Cardiac Pacemakers, Inc. System and method for monitoring autonomic balance and physical activity
US20050137626A1 (en) * 2003-12-19 2005-06-23 Pastore Joseph M. Drug delivery system and method employing external drug delivery device in conjunction with computer network
US20050159801A1 (en) * 2004-01-16 2005-07-21 Medtronic, Inc. Novel implantable lead including sensor
US7286884B2 (en) 2004-01-16 2007-10-23 Medtronic, Inc. Implantable lead including sensor
US7627366B1 (en) 2004-05-17 2009-12-01 Pacesetter, Inc. Analysis of polarization information
US7260431B2 (en) * 2004-05-20 2007-08-21 Cardiac Pacemakers, Inc. Combined remodeling control therapy and anti-remodeling therapy by implantable cardiac device
US7559901B2 (en) 2004-07-28 2009-07-14 Cardiac Pacemakers, Inc. Determining a patient's posture from mechanical vibrations of the heart
US7387610B2 (en) 2004-08-19 2008-06-17 Cardiac Pacemakers, Inc. Thoracic impedance detection with blood resistivity compensation
US8060219B2 (en) 2004-12-20 2011-11-15 Cardiac Pacemakers, Inc. Epicardial patch including isolated extracellular matrix with pacing electrodes
US7981065B2 (en) 2004-12-20 2011-07-19 Cardiac Pacemakers, Inc. Lead electrode incorporating extracellular matrix
US7662104B2 (en) 2005-01-18 2010-02-16 Cardiac Pacemakers, Inc. Method for correction of posture dependence on heart sounds
US20060223455A1 (en) * 2005-03-31 2006-10-05 Silicon Laboratories Inc. System and method for wireless communication using low-pulling digital interface signals
US7603170B2 (en) * 2005-04-26 2009-10-13 Cardiac Pacemakers, Inc. Calibration of impedance monitoring of respiratory volumes using thoracic D.C. impedance
US8118748B2 (en) * 2005-04-28 2012-02-21 Medtronic, Inc. Implantable capacitive pressure sensor system and method
US7907997B2 (en) * 2005-05-11 2011-03-15 Cardiac Pacemakers, Inc. Enhancements to the detection of pulmonary edema when using transthoracic impedance
US7340296B2 (en) 2005-05-18 2008-03-04 Cardiac Pacemakers, Inc. Detection of pleural effusion using transthoracic impedance
US8900154B2 (en) 2005-05-24 2014-12-02 Cardiac Pacemakers, Inc. Prediction of thoracic fluid accumulation
US7922669B2 (en) 2005-06-08 2011-04-12 Cardiac Pacemakers, Inc. Ischemia detection using a heart sound sensor
US8696656B2 (en) * 2005-11-18 2014-04-15 Medtronic Cryocath Lp System and method for monitoring bioimpedance and respiration
US7842031B2 (en) 2005-11-18 2010-11-30 Medtronic Cryocath Lp Bioimpedance measurement system and method
US8108034B2 (en) 2005-11-28 2012-01-31 Cardiac Pacemakers, Inc. Systems and methods for valvular regurgitation detection
US7780606B2 (en) 2006-03-29 2010-08-24 Cardiac Pacemakers, Inc. Hemodynamic stability assessment based on heart sounds
US7794404B1 (en) 2006-03-31 2010-09-14 Pacesetter, Inc System and method for estimating cardiac pressure using parameters derived from impedance signals detected by an implantable medical device
US8000780B2 (en) 2006-06-27 2011-08-16 Cardiac Pacemakers, Inc. Detection of myocardial ischemia from the time sequence of implanted sensor measurements
US8406879B2 (en) 2006-12-20 2013-03-26 Cardiac Pacemakers, Inc. Rate adaptive cardiac pacing systems and methods
US20080195167A1 (en) * 2006-12-29 2008-08-14 Ryan Timothy J Cardiac pacemakers and systems and methods for using them
US20100113945A1 (en) * 2006-12-29 2010-05-06 Ryan Timothy J Hemodynamic monitors and systems and methods for using them
US7736319B2 (en) 2007-01-19 2010-06-15 Cardiac Pacemakers, Inc. Ischemia detection using heart sound timing
US8343059B1 (en) * 2007-02-23 2013-01-01 Pacesetter, Inc. Identifying left atrial pressure elevation by means of a respiratory component
US8208999B2 (en) 2007-04-04 2012-06-26 Pacesetter, Inc. System and method for estimating electrical conduction delays from immittance values measured using an implantable medical device
US8504152B2 (en) 2007-04-04 2013-08-06 Pacesetter, Inc. System and method for estimating cardiac pressure based on cardiac electrical conduction delays using an implantable medical device
JP2011509150A (en) * 2008-01-08 2011-03-24 カーディアック ペースメイカーズ， インコーポレイテッド Impedance measuring apparatus and impedance measuring method using embedded device
US8372013B2 (en) 2008-09-19 2013-02-12 Medtronic, Inc. Method and apparatus for determining a respiration parameter in a medical device
EP2346401B1 (en) * 2008-09-30 2013-05-22 St. Jude Medical AB Heart failure detector
US8571656B2 (en) 2009-12-15 2013-10-29 Cardiac Pacemakers, Inc. Ventricular pacing to augment atrial natriuretic hormone production
US8396563B2 (en) 2010-01-29 2013-03-12 Medtronic, Inc. Clock synchronization in an implantable medical device system
CN108577816B (en) * 2018-04-08 2020-04-28 西安交通大学 Multi-sensor composite right ventricular electrode and fusion cardiac pacing frequency self-adaptive adjustment method
FR3103697B1 (en) * 2019-12-03 2024-02-16 Sorin Crm Sas System for carrying out a cardiographic impedance measurement

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593718A (en) * 1967-07-13 1971-07-20 Biocybernetics Inc Physiologically controlled cardiac pacer
US4686987A (en) * 1981-06-18 1987-08-18 Cardiac Pacemakers, Inc. Biomedical method and apparatus for controlling the administration of therapy to a patient in response to changes in physiologic demand
IT1156564B (en) * 1982-03-16 1987-02-04 Gianni Plicchi IMPLANTABLE CARDIAC ELECTROSTIMULATOR, OF A PHYSIOLOGICAL TYPE, IN WHICH THE STIMULATION FREQUENCY IS REGULATED BY THE PATIENT'S RESPIRATORY FREQUENCY
US4576183A (en) * 1983-09-21 1986-03-18 Gianni Plicchi Electronic circuit for monitoring respiratory parameter for controlling operation of implantable medical device
EP0151689B1 (en) * 1984-02-07 1990-12-27 SCHIAPPARELLI MEDTRONIC S.p.A. Minute ventilation dependent rate responsive pacer
US4566456A (en) * 1984-10-18 1986-01-28 Cordis Corporation Apparatus and method for adjusting heart/pacer rate relative to right ventricular systolic pressure to obtain a required cardiac output
DE3535534A1 (en) * 1985-10-04 1987-04-09 Siemens Ag HEART PACEMAKER
US4702253A (en) * 1985-10-15 1987-10-27 Telectronics N.V. Metabolic-demand pacemaker and method of using the same to determine minute volume
US4790318A (en) * 1986-06-16 1988-12-13 Siemens Aktiengesellschaft Cardiac pacer for pacing a human heart
US4776338A (en) * 1986-06-16 1988-10-11 Siemens Aktiengesellschaft Cardiac pacer for pacing a human heart and pacing method
US4722342A (en) * 1986-06-16 1988-02-02 Siemens Aktiengesellschaft Cardiac pacer for pacing a human heart and pacing method
US4733667A (en) * 1986-08-11 1988-03-29 Cardiac Pacemakers, Inc. Closed loop control of cardiac stimulator utilizing rate of change of impedance
SE8702523D0 (en) * 1987-06-17 1987-06-17 Siemens Elema Ab RATE RESPONSIVE PACEMAKER
US4773401A (en) * 1987-08-21 1988-09-27 Cardiac Pacemakers, Inc. Physiologic control of pacemaker rate using pre-ejection interval as the controlling parameter
DE3732640C1 (en) * 1987-09-28 1989-05-18 Alt Eckhard Medical device for determining physiological functional parameters
US4901725A (en) * 1988-01-29 1990-02-20 Telectronics N.V. Minute volume rate-responsive pacemaker

Also Published As

Publication number Publication date
US5137019A (en) 1992-08-11
DE69125517T2 (en) 1997-07-17
EP0449401A2 (en) 1991-10-02
US5391190A (en) 1995-02-21
CA2033765C (en) 1999-10-19
JP2551696B2 (en) 1996-11-06
EP0449401B1 (en) 1997-04-09
ATE151299T1 (en) 1997-04-15
EP0449401A3 (en) 1991-10-16
JPH0788199A (en) 1995-04-04
DE69125517D1 (en) 1997-05-15

Similar Documents

Publication Publication Date Title
CA2033765A1 (en) Variation in cardiac chamber volume or pressure as a controlling parameter
EP0450229B1 (en) Dual indifferent electrode
CA2033777A1 (en) Rate adaptive cardiac pacer incorporating switched capacitor filter with cutoff frequency determined by heart rate
EP0509172B1 (en) Dual indifferent electrode
GR940300074T1 (en) Rate responsive pacemaker controlled by isovolumic contraction time
US7962210B2 (en) Implantable medical device with voice responding and recording capacity
WO1988003423A3 (en) Improvement in implantations for cardiac stimulation by pacemaker
EP0714677A3 (en) Apparatus and method for stabilizing the ventricular rate of a heart during atrial fibrillation
AU5070293A (en) Dual-chamber implantable pacemaker having an adaptive AV interval that prevents ventricular fusion beats
EP0031229A3 (en) Improvements in cardiac pacer
DE69926347D1 (en) DEVICE FOR CONTROLLING HEART RTHYTHMING USING THE TRANSTHORACOUS IMPEDANCE
EP1199085A3 (en) Implantable cardiac stimulation device and method which optimises pacing effectiveness
CA2211595A1 (en) Dual chamber pacing system and method with optimized adjustment of the av escape interval for treating cardiomyopathy
EP0794812A2 (en) Method and apparatus for rate-responsive cardiac pacing
CA2091708A1 (en) Method and Apparatus for Managing and Monitoring Cardiac Rhythm Using Active Time as the Controlling Parameter
CA2058873A1 (en) Variable Rate Pacemaker Having Upper Rate Limit Governor Based on Hemodynamic Performance
WO2003041796A3 (en) Adjustable cardiac resynchronization
EP0299208A3 (en) Rate responsive pacemaker
CA2133674A1 (en) Using sub-threshold unipolar pacing markers to improve the interpretation of surface ekg in pacemaker patient
ATE50509T1 (en) METHOD OF CONTROLLING A PACEMAKER.
GB1419532A (en) Demand inhibited cardiac pacemaker
CA1098591A (en) Programmable pacer with variable amplifier sensitivity and pacing rate
EP1291037A3 (en) Rate adaptive pacemaker
IT1210067B (en) Rate-responsive, implantable cardiac pacer
IT1180416B (en) Rate-responsive, implantable cardiac pacer

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed