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31st Annual Meeting Abstracts: The impact of follow-up on the success rate of the cryosurgical maze procedure in patients with rheumatic heart disease and enlarged atria

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18. The impact of follow-up on the success rate of the cryosurgical maze procedure in patients with rheumatic heart disease and enlarged atria
N. Ad1, G. Merin2, A. Pollack2, D. Gilon2, S. Barnett1, E. A. Lefrak1, A. Elami2. 1Inova Hear and Vascular Institute, Annandale, VA, 2Hadassah Hebrew University Medical Center, Jerusalem, Israel,

Table of Contents
Background: The predictors for failure of the maze procedure are long-standing AF, rheumatic heart disease (RHD) and enlarged atria. This study assessed the effectiveness of the cryosurgical maze in such patients.
Methods: Fifty patients with AF underwent the full cryomaze procedure (table). Follow up of 18.1±7.6 months (4-31months) was 98% complete.

Age 60±11 years
Female 60%
Permanent AF 68%
Duration 5.8±5.2 years
Persistent or paroxysmal AF 32%
Duration 3.7±3.7 years
Rheumatic Heart Disease 68% (34 pts)
Mean left atrial diameter 6.3±0.8 cm (6.1cm-median)
Concomitant valve urgery 92 %
Repeated Surgery 14 %

Results: The operative mortality was 4 % (2 pts). 98 % of patients were free of AF upon discharge. Fifteen pts. experienced 32 events of intermittent AF (persistent or paroxysmal), all converted back to sinus rhythm with medications and/or cardioversion. 83% of the AF events were recorded during the first year of follow-up and none in patients with follow-up longer then 24 months (n=14). In a univariate model the only predictor for late AF was early postoperative AF. Atrial size, RHD, AF duration, did not predict late AF.
Conclusions: The cryomaze procedure can be performed with high success rate in patients with RHD, enlarged atria, long standing AF and CHF. In our experience arrhythmic events thatwere recorded late in the follow-up but could be converted successfully. Therefore a close follow-up is required to enhance the success rate of the procedure.
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