Abstract
Previous studies have identified the added value of flap fixation in reducing seroma formation and its sequelae after mastectomy. The seroma reduction after mastectomy (SAM)-trial proved that sutures were superior to tissue glue. In this article, we will elaborate on the results of the SAM-trial to provide a clear surgical guideline. All patients in the suture flap fixation cohort from the SAM-trial were analyzed if details regarding flap fixation were available. The most optimal number of sutures was determined using a receiving operator characteristics curve. The incidence of seroma formation between patients receiving the most optimal number of sutures and patients receiving fewer sutures was compared. The most optimal number of sutures proved to be 15. Patients with ≥15 sutures had a lower incidence of seroma formation at every time frame during follow-up. There was a significant difference at 6 weeks (odds ratio [OR]: 3.05, 95% confidence interval [CI]: 1.09-8.56), 3 months (OR: 4.62, 95% CI: 1.34-12.92), and 1 year postoperatively (OR: 20.48, 95% CI: 2.18-192.22). Ten days and 6 months postoperatively did not differ significantly. Flap fixation in general, but also the surgical technique influences the incidence of seroma formation after mastectomy. Results suggest a minimum of 15 sutures, spaced approximately 3.7 cm apart.
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