Infections after mastectomy and tissue expander placement: A multivariate regression analysis

While breast surgery is considered a clean case, tissue expander-based breast reconstruction (TE-BR) has infection rates quoted up to 31%, decidedly higher than the typical 1% to 2% rate of surgical site infections. Through multivariate regression, we sought to analyze risk factors that contribute to infections following TE placement.

A retrospective study reviewed all patients undergoing mastectomy with immediate or delayed TE placement over a 22-month period. Infections were defined as clinically documented cellulitis or infection, return to the operating room (RTOR) for suspected infection, or positive operative or seroma cultures.

A total of 311 patients underwent mastectomy and TE placement to 490 breasts. 13.5% of breasts developed an infection prior to second stage reconstruction. Multivariate logistic regression indicated that patients who developed infections were older (52.8 vs. 47.6 years, OR 1.04, p = 0.02), had higher rates of full-thickness necrosis (24.6% vs. 3.6%, OR 6.64, p<0.01), had higher rates of seromas requiring drainage (33.3% vs. 11.5%, OR 2.79, p<0.01), and had longer periods of drain therapy (24.9 vs. 21.0 days, OR 1.04, p = 0.04). Logistic regression established that longer discharge antibiotic length was not protective against the development of infection.

Patients were more likely to develop an infection as the length of surgical drain retention increased, patient age increased, or if they developed seromas and full-thickness necrosis. Longer post-operative antibiotics were not protective against the development of infection in this sample. Prospective studies are needed to assess how antibiotic lengths can affect the morbidity of patients undergoing TE-BR.