Methods and systems for identifying reasons for ineffective left ventricular capture in cardiac resynchronization therapy based on EGM morphology

摘要

The present disclosure pertains to cardiac pacing methods and systems, and, more particularly, to cardiac resynchronization therapy (CRT). In particular, the present disclosure pertains to determining the efficacy of CRT through use of an effective capture test (ECT). One or more embodiments comprises sensing a signal in response to a ventricular pacing stimulus. Through signal processing, a number of features are parsed from the signal. Exemplary features parsed from the signal include a maximum amplitude, a maximum time associated with the maximum amplitude, a minimum amplitude, and a minimum time associated with the minimum amplitude. The data is evaluated through use of the ECT. By employing the ECT, efficacy of CRT is easily and automatically evaluated. In one or more other embodiments, the reason for ineffective capture is displayed to the user. Exemplary reasons for ineffective capture include pseudo-fusion pacing and lack of capture of the ventricle.

主权项

1. An apparatus for determining a reason for ineffective capture of a ventricle, comprising:
(a) delivering means for delivering a ventricular pacing stimulus; (b) sensing means for sensing a signal in response to the ventricular pacing stimulus; (c) processing means for applying an effective capture test to the sensed data, the effective capture test comprising determining whether the ventricular pacing stimulus was effective or ineffective at capturing the ventricle based on one or more features of the signal and timing of the signal features; (d) means for repeatedly activating (a)-(c); and (e) processing means for determining the reason for ineffective capture following the repeated activation of (a)-(c), wherein determining the reason for ineffective capture comprises determining whether at least two features of the signal and timing of the at least two signal features meet one or more conditions of a set of conditions, the reason being one of pseudo-fusion or lack of ventricular capture.