Method and apparatus for detecting oscillations in cardiac rhythm with electrogram signals

Patent 6957105 Issued on October 18, 2005. Estimated Expiration Date:

March 26, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

Cardiac Pacemakers, Inc.

Application

No. 10106836 filed on 03/26/2002

US Classes:

607/9, Heart rate regulating (e.g., pacing)607/14, Treating or preventing abnormally high heart rate607/15, Selecting plural stimulation patterns607/24, Stroke volume607/17, Parameter control in response to sensed physiological load on heart607/23, Blood pressure607/18, Plural sensed conditions607/5, Cardioverting/defibrillating600/506, By detecting electrical impedance of body portion607/20, Respiratory movement600/515, Detecting arrhythmia600/547, Measuring electrical impedance or conductance of body portion604/67Sensor controls pump, motor, or pressure driven means

Examiners

Primary: Schaetzle, Kennedy J.

Attorney, Agent or Firm

Schwegman, Lundberg, Woessner & Kluth, P.A.

Foreign Patent References

0522693 EP 01/01/1993
WO-97/25098 WO 07/01/1997
WO-00/04947 WO 02/01/2000
WO-00/09206 WO 02/01/2000
WO-01/08748 WO 02/01/2001
WO-01/30436 WO 05/01/2001

International Class

A61N001/368

Abstract

A cardiac rhythm management device is configured to detect oscillations in cardiac rhythm by comparing electrogram signals during successive heart beats. Upon detection of electrical alternans, the device may adjust its operating behavior to compensate for the deleterious effects of the condition.

Other References

Hada, Yoshiyuki , et al., “Pulsus alternans determined by biventricular simultaneous systolic time intervals”, Circulation, vol. 65, No. 3, (Mar. 1982),617-26.
Konta, Tsuyoshi , et al., “Significance of Discordant ST Alternans in Ventricular Fibrillation”, Circulation, vol. 82, No. 6, Dec. 1990, Amercian Heart Association, 2185-2189.
Lee, Y. C. , et al., “Pulsus alternans in patients with congestive cardiomyopathy”, Circulation, vol. 65, No. 7, (Jun. 1982), 1533-4.
Rubenstein, Donald S., et al., “Premature Beats Elicit a Phase Reversal of Mechanoelectrical Alternans in Cat Ventricular Myocytes”, Circulation, vol. 91, No. 1, American Heart Association,(Jan. 1, 1995),201-214.
Schaefer, S , et al., “Clinical and hemodynamic characteristics of patients with inducible pulsus alternans”, American Heart Journal, vol. 115, No. 6, (Jun. 1988), 1251-7.
Smith, Damon , et al., “Influence of the Aortic Component of the Second Heart Sound on Left Ventricular Maximal Negative dP/dt in the Dog”, Am. J. Cardiol., 55:205, (1985),205-209.