ICD with continuous regular testing of defibrillation lead statu

Details ICD with continuous regular testing of defibrillation lead statu ICD with continuous regular testing of defibrillation lead statu

1998-10-30

1999-08-31

Getzow, Scott M.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 8, A61N 137

Patent

active

059447460

ABSTRACT:
An implantable cardiac stimulating device which incorporates the functionality of both a pacemaker and an implantable cardioverter-defibrillator (ICD). The implantable cardiac stimulating device is adapted to periodically obtain an impedance measurement by applying a pacing pulse to the pacing tip and measuring the resulting current on a lead connected to one of the high voltage shocking coils implanted within the heart. The measured impedance between the pacing lead and the shocking lead is compared to previously obtained impedance measurements to determine if an increase in the impedance has occurred. The system is further adapted to compare the impedance measurement to the impedance measured between the pacing lead and the casing of the implantable cardiac stimulating device to determine whether any increase in the measured impedance is due to a problem with the pacing lead or a problem with the high voltage coil or high voltage lead.

REFERENCES:
patent: 4899750 (1990-02-01), Ekwall
patent: 5076272 (1991-12-01), Bozidar
patent: 5534018 (1996-07-01), Wahlstrand et al.
patent: 5549646 (1996-08-01), Katz et al.
patent: 5755742 (1998-05-01), Schuelke et al.
Dohrmann, Mary L. and Goldschlanger, Nora F., "Myocardial Stimulation Threshold in Patients with Cardiac Pacemakers: Effect of Physiologic Variables, Pharmacologic Agents, and Lead Electrodes," Cardiology Clinics, pp. 527-537, Nov. 1985.
Clinical Electrophysiology of Pacing, pp. 43-53.

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