Method of verifying capture of the heart by a pacemaker

Details Method of verifying capture of the heart by a pacemaker Method of verifying capture of the heart by a pacemaker

1993-12-10

1995-07-11

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 26, A61N 137

Patent

active

054316936

ABSTRACT:
A method of verifying cardiac capture. A cardiac signal evoked in response to a cardiac stimulation pulse is sensed via an electrode. The sensed signal is lowpass filtered to remove noise and to pass frequencies characteristic of the evoked cardiac signal. The filtered signal is processed to render a waveform signal representing the second derivative of said filtered signal and the second derivative signal is further analyzed to detect a minimum and a maximum amplitude excursion during a selected window of time beginning at a selected time delay following delivery of the cardiac stimulation pulse. The amplitude difference between the minimum and the maximum is measured and compared to a first reference value. The amplitude of the second derivative is measured during a second selected window of time beginning at a selected time delay following delivery of said cardiac stimulation pulse, and compared to a second reference value. A capture detect signal is generated if the amplitude difference exceeds the first reference value, but the amplitude does not exceed the second reference value.

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