User Manual Part 1

4-4
TACHYA RRHYTHMIA THERAPY
VENTRICULAR THERAPY
• If the arrhythmia is not converted and an arrhythmia is redetected in
the same ventricular zone, the next programmed therapy in that zone
is selected and delivered (Figure 4-2 on page 4-4), followed again by
redetection. If the arrhythmia persists in the same zone, the therapy will
progress in that zone.
• If an arrhythmia crosses ventric ular zones (accelerates or decelerates)
following therapy delivery and is redetected in a higher or lower ventricular
zone, a therapy of equal or greater strength than the previously delivered
therapy is selec te d from the detected zo n e and delivered (Fig ure 4-3 on
page 4-5 through Figure 4-10 on page 4-8). For shock therapy, the pulse
generator determines which shock to deliver prior to capacitor charging
based on the detected rate threshold. If during capacitor charging, the
tachyarrhyth mia accelerates or dec elerates from the initial detecte d rate,
the predetermined energy will still be delivered.
Redetection is performed after each therapy delivery to determine if further
therapy is required.
1
3 2 4 5
6 7
Zone ATP1 ATP2 QUICK
CONVERT ATP
Shock 1 Shock 2 Remaining Shocks
VF
VT
VT-1
On/Off
N/A
N/A
5 J
3 J
0.1 J
11 J
9 J
2 J
Burst Scan
Ramp Burst
max max max max max max
max max max max
max max max
Figure 4-2. Therap y delivery progression, arrhythmia remains in same zo ne as initially detected
After each redetection cycle, therapy delivery progresses in the direction
indicated by the circled numbers (Figure 4-3 on page 4-5 through Figure 4-10
on page 4-8).
• Upward sloping lines indicate acceleration of the arrhythmia to a higher
ventricular zone
• Downward sloping lines indicate deceleration into a lower ventricular zone
The lowest strength therapy is in the ATP columns; the therapy strengths
increase as you move to the right in the table.
- DRAFT -