Dual chamber pacemaker system with improved response to retrogra

Details Dual chamber pacemaker system with improved response to retrogra Dual chamber pacemaker system with improved response to retrogra

1994-12-02

1996-07-09

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 1362

Patent

active

055340172

ABSTRACT:
A dual chamber pacemaker is provided with the capability of determining when there is retrograde conduction, and responding by switching into an asynchronous mode of ventricular pacing. The pacemaker's response to RC further includes delivering at least a first asynchronous ventricular pace pulse at a ventricular escape interval calculated to occur at an appropriate AV delay following the next expected spontaneous natural beat. Thus, the ventricular escape interval can be calculated as V.sub.esc =VA+AA.sub.avg +AV.sub.min, where VA is the retrograde time from the prior ventricular pulse to the retrograde atrial sense (or PAC), AA.sub.avg is a measure of the average natural atrial rate before retrograde conduction, and AV.sub.min is a predetermined value of AV delay. This optimum value of V.sub.esc is designed to regain synchronous tracking of the natural sinus after the first extended ventricular pulse. Alternatively, the response can aim to regain tracking in N cycles, where V.sub.esc =AA.sub.avg +.DELTA., where .DELTA.=(AV.sub.min +VA)/N.

REFERENCES:
patent: 4401119 (1983-08-01), Herpers
patent: 4788980 (1988-12-01), Mann et al.
patent: 4890617 (1990-01-01), Markowitz et al.
patent: 4967746 (1990-11-01), Vandegriff
patent: 5247929 (1993-09-01), Stoop et al.

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