User Manual Part 2

TAC HYARRHYTHMIA THERAPY

VENTRICULAR SHOCK THERAPY AND PARAM ETER S

4-21

VENTRICULAR SHOCK THERAPY AND PARAMETERS

The pulse generator delivers shocks synchronous to a sensed event. The

shock vector, energy level, and polarity of the shocks are programmable.

Ventricular Shock Vector

The programmed Ventricular Shock Vector indicates the vector of energy

delivery for ventricular shock therapy.

The following programmable conﬁgurations are available:

• RV Coil to RA Coil and Can––this vector is also known as the V-TRIAD

vector. It uses the metallic hou sing of the pulse generato r as an ac tive

electrode (“hot can”) combined w ith the ENDOTAK two-electrode

deﬁbrillation lead. Energy is sent via a dual-current pathwa y fro m the dista l

shocking electrode to the proximal electrode and to the pulse generator

case.

• RV C oil to Can––this vec to r uses the metallic housing of the pulse

generator as an active electrode (“hot can”). Energy is sent from the distal

shocking electrode to the pulse generator case. This conﬁguration should

be selected when using a single-coil lead.

• RV Coil to RA Coil––this vector removes the pulse generator case as

an active electrode and is also known as a “cold can” vector. Energy is

sent from the distal shocking ele ctrode to the proximal ele ctrode. This

vector shou ld never be used with a single-coil lead, as a sh o c k will not

be delivered.

Ventricular Shock Energy

Ventricular shock energy determines the strength of shock therapy delivered

by the pulse generator.

Shock output remains constant over the lifetime of the pulse generator,

regardless of changes in lead impedance o r battery voltage. The constant

output is accomplished b y varying pulse width to adjust to changes in lead

impedance.

The ﬁrst two shocks in each ventricular zone can be programmed to optimize

charge time, longevity, and safety margins. The remaining shock energies in

each zone are nonprogrammable at the maximum-energy value.

- DRAFT -