The goal of this study was to examine the relationship between body mass index (BMI) and the success rate of sentinel lymph node (SLN) mapping using indocyanine green and near-infrared imaging. Sentinel lymph node mapping is recommended for patients with endometrial carcinoma to reduce the rate of full lymphadenectomy and its associated morbidity such as lymphedema. A retrospective review was conducted of robotic hysterectomy procedures for patients with a coded diagnosis of endometrial cancer and a cost code for indocyanine green discharged between March, 2016 and August, 2019. Preoperative characteristics included age, BMI, and number of prior abdominal surgeries (includes cervical, adnexal, uterine or rectal procedures, caesarian section, or appendectomy). Intra and postoperative characteristics included procedure time (incision to close), estimated blood loss, the American Society of Anesthesiologists (ASA) physical status classification, uterine weight, uterine diameter, FIGO Grade, myometrial depth, and depth of myometrial invasion. SLN and non-SLN number, location, and pathology were recorded. The primary outcome was the bilateral success rate for SLN mapping. Patients with class III obesity (BMI > 40) were found to have a significantly lower success rate for SLN mapping when compared with all other BMI categories (54.1% vs. 76.1%, respectively, p < 0.01).
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