The Association of Age and Repair Modification with Outcome after Cone Repair for Ebstein's Malformation.

Cone repair (CR) uses native tissue for tricuspid valve (TV) repair and provides potential for growth. Results after CR were investigated in different age groups including several surgical modifications. Single institution retrospective analysis of all CR excluding neonatal procedures. Endpoints included TV reoperation, late tricuspid regurgitation (TR) and death. Between April 2006 and August 2019, 157 patients underwent CR at a median age of 11.7 years (range, 0.3-57.2). 20% (n=32) of patients had previous surgery. Repair modifications included atrial reduction (n=111,71%), right ventricular plication (n=85,55%), leaflet augmentation (n=36,23%), papillary muscle repositioning (n=50,32%), ring annuloplasty (n=70,45%). Early re-operation for recurrent TR occurred in 11 patients. Median follow-up time was 4.3 years (range, 9d-12.3y). There was no significant association between age at repair and time to TV reoperation (p=0.25). However, age <4 years at CR was identified as the most discriminating binary age threshold for the patients with TV reoperation (25.0% in <4y group vs. 9.3% in the ≥4y group). Placement of an annuloplasty ring was protective against ≥moderate TR (OR=0.39, 95% CI 0.16-0.95, p=0.039). Freedom from late TV re-operation was 94.1% at 7 years. Survival was 97.9% at 6 years. Repair after age 18 years was associated with mortality in early follow-up (p=0.037). Mid-term results for CR are favorable in children and adults. Time to TV reoperation may be shorter when Cone repair is performed before age four years, but this result requires confirmation in a larger sample. An annuloplasty ring should be considered when appropriate.