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
Sinus node dysfunction (SND) gets a clear endorsement for dual chamber (DDD) pacing with a class I indication, even in those without manifest AV conduction abnormalities.
Rate responsive pacing is given a Class IIa indication in those with documented chronotropic incompetence.
In AV block , dual chamber pacemakers also get a class I indication.
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