A randomized comparison ofatrial and dual-chamber pacing in177 consecutive patients with sick sinus syndrome
Echocardiographic and clinical outcome
Jens C. Nielsen, MD, PhD*,
Lene Kristensen, MD*,
Henning R. Andersen, MD, DMSc*,*,
Peter T. Mortensen, MD*,
Ole L. Pedersen, MD, DMSc and
Anders K. Pedersen, MD, DMSc*
* Department of Cardiology, Skejby Hospital, Aarhus University Hospital, Aarhus, Denmark
Department of Medicine, Viborg County Hospital, Viborg, Denmark
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Figure 1 Pacing mode at implantation and at the end of follow-up or death. VVI = single chamber ventricular pacemaker; other abbreviations as in Tables 1 and 2.
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Figure 2 Mean left atrial diameter from M-mode echocardiographic measurements at implantation and during follow-up. Pre = the day before pacemaker implantation; 1 day = the day after pacemaker implantation. Numbers below x-axis indicate numbers of patients who had M-mode echocardiography at each follow-up in each group. Solid diamonds = AAIR; solid squares = DDDR-s; solid triangles = DDDR-l; stars = DDDR-s-AAI. Abbreviations as in Tables 1 and 2.
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Figure 3 Kaplan-Meier plots of freedom from atrial fibrillation during follow-up. Atrial fibrillation was diagnosed only by standard 12-lead electrocardiogram at planned follow-up visits, not in-between these visits. AAIR = single lead atrial pacing; DDDR-l = dual-chamber pacing with the pacemaker programmed with a fixed atrioventricular (AV) delay of 300 ms; DDDR-s = dual-chamber pacing with the pacemaker programmed with a rate-adaptive AV delay  150 ms and ventricular capture.
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