Effective capture
AssigneeMedtronic, Inc.
InventorsSubham Ghosh, Robert W. Stadler
Life of this patent
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Abstract
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.
Claims21
An apparatus for determining whether a ventricular pacing stimulus is capturing a paced ventricle during cardiac resynchronization therapy:
- (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 determining from the signal a maximum amplitude, a maximum time associated with the maximum amplitude (Max), a minimum amplitude (Min), and a minimum time (Tmin) associated with the minimum amplitude;
- (d) processing means for applying an effective capture test to the sensed data, the effective capture test comprising one or more conditions:
- (1) Tmax−Tmin>25 ms;
- (2) |Max−baseline (BL)|/|Min−BL|≧0.125|;
- (3) BL<|Min|/8;
- (4) |Max−BL|/|Min−BL|<8;
- and
- (5) Max>BL;
- (e) means for repeatedly activating (a)-(d);
- and
- (f) processing means for determining the reason for ineffective capture following the repeated activation of (a)-(d).
A method for determining whether a ventricular pacing stimulus is capturing a paced ventricle during cardiac resynchronization therapy, the method comprising:
- (a) delivering a ventricular pacing stimulus;
- (b) sensing a signal in response to the ventricular pacing stimulus;
- (c) determining from the signal a maximum amplitude, a maximum time associated with the maximum amplitude (Max), a minimum amplitude (Min), and a minimum time (Tmin) associated with the minimum amplitude;
- (d) applying an effective capture test to the sensed data, the effective capture test comprising one or more conditions:
- (1) Tmax−Tmin>25 ms;
- (2) |Max−baseline (BL)|/|Min−BL|≧0.125|;
- (3) BL<|Min|/8;
- (4) |Max−BL|/|Min−BL|<8;
- and
- (5) Max>BL;
- (e) repeatedly activating (a)-(d);
- and
- (f) determining the reason for ineffective capture following the repeated activation of (a)-(d).
A nontransitory machine readable medium containing executable computer program instructions which when executed by a data processing system cause the system to perform a method, the method comprising:
- (a) delivering a ventricular pacing stimulus;
- (b) sensing a signal in response to the ventricular pacing stimulus;
- (c) determining from the signal a maximum amplitude, a maximum time associated with the maximum amplitude (Max), a minimum amplitude (Min), and a minimum time (Tmin) associated with the minimum amplitude;
- (d) applying an effective capture test to the sensed data, the effective capture test comprising one or more conditions:
- (1) Tmax−Tmin>25 ms;
- (2) |Max−baseline (BL)|/|Min−BL|≧0.125|;
- (3) BL<|Min|/8;
- (4) |Max−BLI/|Min−BL|<8;
- and
- (5) Max>BL;
- (e) repeatedly activating (a)-(d);
- and
- (f) determining the reason for ineffective capture following the repeated activation of (a)-(d).
Dependencies are inferred from the claim text.