User Manual Part 2

3-38
TACHYARRHYTHMIA DETECTION
VENTRICULAR DETECTION
Tab le 3-12. Vector Timing an d Correlation an d Stability combinations with resulting therapy decision if Atrial
Tach yarryth mia Discrimination is programmed to Off (con tinued)
Detection
ab
Dectected Ventricular
Rhythm
ac
Therapy Decision
Post-shock Unstable Inhibit
d
Post-shock
Stable
Treat
a. If the detected ventricular rhythm changes, then the appropriate, corresponding row in the table is evaluated.
b. If Atrial Tachyarrhythmia Discrimination is programmed to Off, then Vector Timing and Correlation is used for Initial Detection,
and Stability is used for Postshock Detection.
c. If a Rhythm ID reference template is not available, the detected ventricular rhythm is considered to be Uncorrelated.
d. Decision to inhibit can be overridden by expiration of SRD.
Combinations of AFib Rate Threshold, Stability, and Onset
The combin ation of A Fib R ate Threshold, Sta bility, and Onset add specificity
to ventricular detection beyond rate and duration. This combination of
detection enhancements is ava ilab le only when the Onset/Stability de tection
enhancement suite is enabled and is available only for Initial Detection. When
detection enhancements are enabled, they will act to recommend or inhibit
therapy for a specific zone.
If AF ib Rate Thre sh o ld, Stab ility, and Onset paramete rs are all programmed
to On, ventricular therapy will be initiated if the rhythm has a sudden onset
provided that either the v entricular rate is stable or the atrial rate is less than
the AFib Rate Threshold (Table 3-13 on page 3-38).
Tab le 3-13. AFib Rate Threshold , Stability, and Onset combinations and r esult ing ventricular therapy
Detected Ven tricular Rhythm
a
Therapy Decision
b
Gradual, Unstable, A > AFib Rate
Threshold
Inhibit
Gradual, Unstable, A < AFib Rate
Threshold
Inhibit
Sudden, Unstable, A > AFib Rate
Threshold
Inhibit
Sudden, Unstable, A < AFib Rate
Threshold
Treat
c
Gradual, Stable , A > AFib Rate Threshold
Treat
Gradual, Stable , A < AFib Rate Threshold
Inhibit
Sudden, Stable, A > A F ib Rate Threshold
Treat
Sudden, Stable, A < AFib Rate Threshold
Treat
a. If the detected ventricular rhythm changes, then the appropriate, corresponding row in the table is evaluated.
b. Decisions to inhibit can be overridden by V > A or expiration o f SRD.
c. If V Rate > A Rate is programmed to On and is False, ventricular therapy will be inhibited because the rhythm is unstable.
- DRAFT -