The following article has been published, where simultaneous atrial + ventricular pacing was used in pts with Atrial Fibrillation:

Raatikainen MJP, Jokinen V, Virtanen V, Hartikainen J, Hedman A, Huikuri HV for the CARISMA INVESTIGATORS. Microvolt T-wave alternans during exercise and pacing in patients with acute myocardial infarction. PACE 2005;28:Suppl 1:S193-7.

In the discussion of the paper, the authors write that: “ In contrast to exercise test and A pacing, simultaneous V+A pacing can be used to assess TWA also in patients with atrial fibrillation and impaired AV nodal conduction. This approach also eliminates retrograde atrial activation and/or random sinus activity at descending portion of the T wave, which may obscure the TWA analysis during ventricular pacing. The data obtained with V+A pacing were similar to those measured during the bicycle exercise and A pacing “