DIEP flap in breast reconstruction: A morbidity study of bilateral versus unilateral reconstruction.

[BACKGROUND] The Deep Inferior Epigastric Perforator (DIEP) flap is a modality in breast reconstruction of choice. Despite its well-documented benefits and complications, a lack of evidence remains with regards to the risks of performing a bilateral versus a unilateral reconstruction. As such, we sought to compare the rates of adverse outcomes in the perioperative and postoperative periods associated with a unilateral versus a bilateral DIEP flap breast reconstruction.

[METHODS] A retrospective cohort study of 178 consecutive patients undergoing unilateral versus. bilateral deep inferior epigastric perforator flap breast reconstruction was performed at our tertiary care center over a 3-year period. Data on demographics, operative time, intraoperative and postoperative complications, and surgical re-exploration, were extracted for both groups. Statistical analysis was performed on a per-flap basis.

[RESULTS] A total of 157 unilateral and 42 bilateral deep inferior epigastric perforator flaps were identified. The rate of intra-operative complications was 12.1% for unilateral versus. 4.8% for bilateral flaps (P=0.26). Total post-operative complications rates were 30.6% for unilateral versus 54.7% for bilateral flaps (P=0.003). Surgical re-exploration was performed in 12.7% of unilateral and 11.9% of bilateral cases (P=0.88). The rate of total flap loss was similar between types of reconstruction, occurring in 2.5% of unilateral vs. 2.4% of bilateral flaps (P=1).

[CONCLUSION] This study demonstrates the rate of complications per flap is significantly higher in bilateral versus unilateral deep inferior epigastric perforator flap breast reconstruction. Bilateral DIEP breast reconstruction should be decided on a case-by-case basis.

[LEVEL OF EVIDENCE] Prognostic/Risk Study, Level II.