A Second Drain Decreases Seroma Formation in Prepectoral Immediate Breast Reconstruction with an Acellular Dermal Matrix

Seroma formation is the most common complication after mastectomy. While the exact pathophysiology behind seroma development has not been entirely elucidated, seromas are associated with negative outcomes in breast reconstruction. The utilization of drains is one method to combat seroma. However, the current state of plastic surgery is divided as to whether one drain or two drains is optimal in reducing seroma formation. We hypothesized that using two drains instead of one drain would reduce the risk of seroma more so than one drain. METHODS: This was a retrospective cohort study of patients who underwent prepectoral direct to implant reconstruction at a single institution by a single surgeon. Each patient underwent reconstruction with either one or two drains. Patients were followed postoperatively for rates of seroma formation. Seroma were classified as either minor or major. Secondary variables including drain duration, infection, and necrosis were also analyzed. RESULTS: A total of 99 breasts and 71 patients experienced breast reconstruction with two drains, and 163 breasts corresponding to 135 patients received reconstruction with one drain. In the two drain cohort, 14 (14.1%) developed a seroma, with 11 (11.1%) being minor seromas and three (3.03%) being major seromas. In comparison, out of the one drain cohort, 41 (25.2%) developed a seroma, with 35 (21.5%) being a minor seroma and six (3.68%) being classified as major. CONCLUSION: This study suggests that two drains decreases the rate and risk of seroma formation compared to one drain in prepectoral breast reconstruction with an acellular dermal matrix.