Adaptive refractory period within implantable cardioverter-defib

Details Adaptive refractory period within implantable cardioverter-defib Adaptive refractory period within implantable cardioverter-defib

1994-04-12

1995-11-28

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 13, 607 4, A61N 139

Patent

active

054703425

ABSTRACT:
An implantable cardioverter-defibrillator (ICD) adaptively adjusts the refractory period and sensitivity setting of its sensing channel in order to optimally detect depolarization signals indicative of intrinsic cardiac rhythm or tachycardias, or depolarization signals indicative of fibrillation. In one embodiment, the ICD utilizes first and second depolarization signal processing channels, each having first and second refractory periods and first and second sensitivity settings, respectively. The sensitivity settings of the first processing channel are adaptively adjusted to sense normal depolarization signals and tachycardias. The sensitivity settings of the second processing channel are adaptively adjusted to sense fibrillation. Both the first and second refractory periods begin following either a paced depolarization or a sensed depolarization.

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