Complication Rates in Delayed Reconstruction of the Head and Neck After Mohs Micrographic Surgery.

IMPORTANCE: Same-day Mohs reconstructive surgery is not always possible owing to patient factors, scheduling, and complexity of defect, but there is hesitancy in delaying closure of such defects.

OBJECTIVE: To describe the frequency of and predictors of complications in patients undergoing delayed facial reconstruction after Mohs micrographic surgery (MMS).

DESIGN, SETTING, AND PARTICIPANTS: This was a retrospective, multi-institutional cohort study from February 1, 1989, to December 31, 2012. Data were pooled from 2 institutions: University of Washington Medical Center and Virginia Mason Medical Center. All patients who underwent MMS for facial carcinomas with delayed (non-same-day) reconstruction were included. We excluded those with incomplete medical records and no follow-up. The analysis was performed from June 2014 to March 2016.

MAIN OUTCOMES AND MEASURES: Our main outcome measure was postoperative complication, classified as immediate (≤24 hours after surgery) or delayed (>24 hours after surgery).

RESULTS: A total of 415 cases in 342 patients were identified. Reconstruction occurred from 1 to 11 days after excision, with 95.4% of repairs occurring within 2 days of MMS. The overall complication rate was 8.2%. The total delayed complication rate was 7.7% (32 of 415 cases). The overall infection rate was 2.4%. In terms of patient characteristics, reconstruction delayed more than 2 days, bone or cartilage exposure, and large defects were associated with complications. In terms of defect location and reconstruction type, complications were associated with composite defects (those that included >1 facial subunit) and use of interpolated flaps with cartilage grafting. We used these variables in a multivariable logistic regression model and found that composite location, use of interpolated flap with cartilage grafting, and reconstruction delayed more than 2 days were associated with postoperative complications. Among the variables in the model, composite location of defects, interpolated flap with cartilage grafting, and delayed reconstruction greater than 2 days were found to have a statistically significant association with a complication (OR, 3.48 [95% CI, 1.16-10.56]; OR, 4.93 [95% CI, 1.44-16.95]; OR, 4.26 [95% CI, 1.24-14.60], respectively).

CONCLUSIONS AND RELEVANCE: To our knowledge, this is the largest study to report complication rates in delayed reconstruction of MMS defects in the head and neck, noting a rate that is similar to what has been reported in the literature. We noted a statistically significant increased risk of complications when reconstruction is performed for composite defects, if an interpolated flap with cartilage is performed, and if reconstruction is performed after more than 2 days.

LEVEL OF EVIDENCE: 3.