Device for detecting retrograde conduction

Details Device for detecting retrograde conduction Device for detecting retrograde conduction

A - Human Necessities

61

N

326/1.1

A61N 1/36 (2006.01) A61B 5/04 (2006.01) A61N 1/37 (2006.01)

Patent

CA 1239447

DEVICE FOR DETECTING RETROGRADE CONDUCTION ABSTRACT A pacing system analyzer is constructed to provide verification that an implantable cardiac pacer operating in a demand mode will not itself produce tachycardia in a patient because of abnormally long patient retrograde conduction time. The analyzer when performing the retrograde conduction test provides an intercardiac electrogram, changes the ventricular sense amplifier to asynchronous and samples to determine the maximum amplitude signals over a sampling period to select an amplifier gain factor. After the gain factor is set additional signal samples are collected, peak-to-peak amplitude is measured and interpolation between data is made to provide waveform "segments" and the best waveform segment to employ for testing for retrograde conduction is selected. The time periods from pacing to these segments are measured and utilized to determine if retrograde conduction is present.

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