Single lead VDD pacing in those with intact sinus node function (i.e. a young patient with congenital AV block) gets a class IIa indication.
FORBES: Overview of the New HRS/ACCF Pacemaker Guidelines
The authors still give a Class I alternative for single lead atrial (AAI) pacing, but only in those with normal AV conduction.
Single chamber ventricular pacing is considered an acceptable alternative in sedentary patients or those in whom technical issues make atrial lead placement difficult or impossible.
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