User Manual Part 1

3-10
TACHYARRHYTHMIA DETECTION
VENTRICULAR DETECTION
• Biventric ular Trigger, Rate Smoothing, ATR, hysteresis, and dynamic
programming (excluding Dynamic VRP) are suspended. The pacing
chamber is set to Biventricular; LV Offset is set to 0.
2. After the Fallback interval, pacing parameters are restored to normal
programmed parameters. This process will typically last one minute.
NOTE: Rhythm ID Fallback LRL settings should be selected such that normal
sinus rhythms are promoted (e.g., normal AV node conduction). Care must be
used when selecting LRL less than 50 ppm (rates that approach the patient’s
ventricular escape rates). Ventricular escape rhythms during Rhythm ID
updates may result in inappropriate therapy decisions.
NOTE: A manual Rhythm ID reference template update should not be
commanded immediately after shock therapy. It may take several minutes for
irregularities in EGM morphology caused by the shock to subside.
Onset/Stab i lit y
The Onse t/Sta bility d etection enhan ce ment suite analyze s t he cardiac cy cle
intervals to determine if a patient’s rhythm should be treated (VT) or if therapy
should be inhibited (SVT).
Onset/S tability allows you to progra m detection enhancements by identify ing
the desired type of rhythm discrimination: atrial tachyarrhythmia, sinus
tachycardia, or polymorphic VT (Table 3-4 on page 3-10).
Table 3-4. Onset/Stability rhythm discrimination availab le per zone
VT-1 Zone VT Zone VF Zone
Atrial Tachyarrhythmia Polymorphic V T
a
3-zone Configuration
Sinus Tachycardia
None
Atrial Tachyarrhythmia
Sinus Tachycardia
3-zone Configuration
(with Monitor Only zone)
b
None
Polymorphic VT
a
None
Atrial Tachyarrhythmia
Sinus Tachycardia
2-zone Configuration
Polymorphic VT
a
None
- DRAFT -