User Manual Part 1

TACHYARRHYTHMIA THERAPY
VENTRICULAR SHOCK THERAPY AND PARAMETERS
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).
CAUTION: For IS-1/DF-1 leads, never change the shock waveform
polarity by physically switching the lead anodes and cathodes in the pulse
generator header—use the programmable Polarity feature. Device damage
or nonconversion of the arrhythmia post-operatively may result if the polarity
is switched physica lly.
Biphasic
V1
V2
PW1
PW2
V3
V4
PW = Pulse Width
PW2 = PW1 x 0.66
V2 = V3
Figure 4-21. Biphasic waveform
+
–
+
–
+
–
Initial polarity Reverse polarity
Figure 4-22. Polarity of shock delivery
Committed Shock/Reconfirmation of the Ventricular Arrhythmia
Committed Shock/Reconfirmation refers to the monitoring performed by the
pulse generator before delivery of a ventricular shock.
- DRAFT -