Impact of Implant Exchange Timing after Postmastectomy Radiation in Immediate Tissue Expander Breast Reconstruction.

[BACKGROUND] The use of postmastectomy radiation therapy (PMRT) in the setting of immediate 2-stage breast reconstruction is becoming increasingly widespread. However, the timeframe of tissue expander exchange for permanent implant placement following PMRT is not well defined, and it remains unclear what time interval optimizes surgical outcomes and patient satisfaction.

[METHODS] A systematic review conducted in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses 2020 was completed. The PubMed, Embase, Scopus, and Cochrane databases were searched under keywords pertaining to concepts of tissue expander breast reconstruction and PMRT. Inclusion criteria encompassed primary articles on tissue expander breast reconstruction with adjuvant radiation therapy reporting timing of exchange to permanent implant following radiation therapy and surgical outcomes.

[RESULTS] Of the initial 1259 publications, 15 studies met our inclusion criteria, and 11 studies had granular enough data to use for pooled analysis. Implant exchange less than 6 months after PMRT was found to be associated with increased incidence of wound dehiscence (17.12% versus 3.64%; P < 0.001) and hematoma (25% versus 2.59%; P < 0.001) compared with exchange after 6 months. There was no significant difference in incidence of surgical-site infection, seroma, capsular contracture, or reconstructive failure.

[CONCLUSIONS] Expander-to-implant exchange at less than 6 months is associated with a higher incidence of wound dehiscence and hematoma formation but does not increase the risk of reconstruction failure. The limited research on ideal timing prompts further investigation to optimize surgical outcomes for the increasing patient population undergoing PMRT and immediate 2-stage breast reconstruction.