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Double blind crossover comparison of the effects of dual chamber (DDD) and ventricular rate adaptive (VVIR) pacing on neuroendocrine variables, exercise performance, and symptoms in complete heart block.
Seven patients had DDDR pacemakers (Medtronic, n= 4; Vitatron, n=1; Biotronik, n=2) and 25 patients had VVIR pacemakers (Medtronic, n=13; St.
Since the patient had good intrinsic sinus rhythm at a rate of 55 bpm and potential complication risk during a subsequent lead revision, which was also refused by the patient, we reprogrammed the generator to VVIR mode that was well tolerated by the patient during follow-up.
Pacing modes were VVIR in 72%, VDD in 13%, AAIR in 8%, and DOD in 7% of patients atthe initial implantation time.
Of 40 pacemakers 15 were programmed to VVIR, 11 DDDR, 7 DDD, and 7 VDDR modes.
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