Specifications

VVI Mode
Indications for the VVI Mode
The VVI mode may be indicated in the presence of the following
conditions:
■
Any symptomatic bradyarrhythmias but particularly when there is no
significant atrial hemodynamic contribution as in persistent or
paroxysmal atrial flutter/fibrillation or the presence of giant atria.
■
No evidence of pacemaker syndrome due to loss of atrial contribution
or negative atrial kick.
■
Symptomatic bradycardia where pacing simplicity is the prime concern
in cases of senility, terminal disease, inaccessibility to a follow-up
center, or absent retrograde ventriculoatrial (VA) conduction.
■
Patients in whom it is necessary to disable the atrial circuit (for
example, lead fracture, inappropriate function, and so forth).
■
Certain atrial and ventricular ectopic arrhythmias including chronic
atrial fibrillation and flutter.
Contraindications for the VVI Mode
The VVI mode is contraindicated in the presence of the following
conditions:
■
Known pacemaker syndrome or symptoms produced by temporary
ventricular pacing at the time of initial pacemaker implantation.
■
The need for maximum atrial contribution because of congestive heart
failure or a special need for rate response.
10-28 Understanding Pacemaker Operations
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