User Manual Part 2

4-22
TACHYARRHYTHMIA THERAPY
VENTRICULAR SHOCK THERAPY AND PARAMETERS
Charge Time
Charge time is the time the pulse generator requires to charge for delivery of
the programmed shock energy.
Charge time is dependent on the following:
• Programmed output energy level
• Battery condition
• Condition of the energy storage capacitors
Charge times increase as the pulse generator is programmed to higher energy
output levels and as the battery depletes (Table 4-1 on page 4-22).
Capacitor deformation can occur during inactive periods and may result in a
slightly longer charge time. To reduce the impact of capacitor deformation on
charge time, the capacitors are automatically reformed.
Table 4 -1. Typical charge time required at 37 degrees C at BOL
Energy Stored (J)
a
Energy Delivered
(J)
b
Charge Time
(seconds)
c
11.0 10.0 1.9
17.0 15.0 2.9
26.0 22.0 4.7
41.0
d
35.0 8.4
a. Values indicate the energy level stored on the capacitors and correspond to the value programmed for shock energy parameters.
b. The energy delivered indicates the shock energy level delivered through the shocking electrodes.
c. Charge times shown are at BOL after capacitor re-formation.
d. HE.
Waveform Polarity
Waveform polarity reflects the relationship between the leading edge voltages
on the defibrillating output e lectrodes. All shocks will be delive r ed using a
biphasic waveform (Figure 4-21 on page 4-23).
The selection of the shock polarity applies to all shocks delivered by the device.
If the preceding shocks in a zone are unsuccessful, the last shock of that zone
will be automatically delivered at an inverted polarity to the previous shock
(initial or reversed) (Figure 4-22 on page 4-23).
- DRAFT -