Guidelines for choice of pacemaker generator in selected indications for pacing

Type of pacemaker	Sinus node dysfunction	AV block	Neurally-mediated syncope or carotid sinus hypersensitivity
Single-chamber atrial	No suspected abnormality of AV conduction and not at increased risk for future AV block Maintenance of AV synchrony during pacing desired Rate response available if desired	Not appropriate	Not appropriate (unless AV block systematically excluded)
Single-chamber ventricular	Maintenance of AV synchrony during pacing not necessary Rate response available if desired	Chronic atrial fibrillation or other atrial tachyarrhythmia or maintenance of AV synchrony during pacing not necessary Rate response available if desired	Chronic atrial fibrillation or other atrial tachyarrhythmia Rate response available if desired
Dual-chamber	AV synchrony during pacing desired Suspected abnormality of AV conduction or increased risk for future AV block Rate response available if desired	AV synchrony during pacing desired Atrial pacing desired Rate response available if desired	Sinus mechanism present Rate response available if desired
Single-lead, atrial-sensing ventricular	Not appropriate	Normal sinus node function and no need for atrial pacing Desire to limit number of pacemaker leads	Not appropriate

AV: atrioventricular.

Data from Gregoratos G, Cheitlin MD, Conill A, et al. Circulation 1998; 97:1325.

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