User Manual Part 1

TACHYARRHYTHMIA DETECTION
VENTRICULAR DETECTION
3-17
• If the higher zone’s detection w indow does not remain satisfied, then the
Duration timers for the lower ventricular zones are no longer ignored.
Programme d therapy for lower ventricular zones will be initiated when a lower
ventricular zone’s duration is met and no higher ventricular zone’s window is
satisfied (Figure 3-8 on page 3-17, Figure 3-9 on page 3-17).
VF window satisfied.
VF Duration starts.
VF Duration 1 s
VF window remains satisfied. VF Duration expires
and detection is met. Charging begins. VT Duration
expires during charging, but is ignored.
Charging
VT window satisfied.
VT Duration starts.
VT detected VT Duration 5 s
VF detected
Figure 3-8. Interaction of ventricular Duration , 2-zon e c onfiguration, charging
VF window satisfied.
VF Duration starts.
VF window does not remain satisfied.
VF Duration is not satisfied.
VT Detection is met.
VT window satisfied.
VT Duration starts.
VT Duration expires. Detection is not met
because VF window is satisfied.
VT detected
VF detected
VF Duration 1 s
VT Duration 5 s
Charging
Figure 3-9. Interaction of ventricular Duration, 2-zone configuration, charging delayed
Ventricular Redetection Duration and Post-shock Duration
Duration parameters are used to identify tachyarrhythmias during the ventricular
redetection process.
• Redetection Duration is applied following delivery of ATP therapy (except
QUICK CONVERT ATP), a diverted-reconfirm, manually diverted therapy,
or if therapy is unavailable at Detection Met (Figure 3-10 on page 3-18).
• Post-shock Duration is applied follow ing shock therapy deliv ery (F ig ure 3-11
on page 3-18).
- DRAFT -