05431693 is referenced by 195 patents and cites 22 patents.

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.

Title
Method of verifying capture of the heart by a pacemaker
Application Number
8/165251
Publication Number
5431693
Application Date
December 10, 1993
Publication Date
July 11, 1995
Inventor
Edward A Schroeppel
Lake Jackson
TX, US
Agent
Richard L Robinson
Assignee
Intermedics
TX, US
IPC
A61N 1/37
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