Analysis of Perfusion in the DIEP Flap: Role of the Location of the Perforator, Umbilicus, and Midline Crossing-Over Vessel

During breast reconstruction, predicting contralateral perfusion of the deep inferior epigastric artery perforator flap can help minimize tissue necrosis. This study aimed to quantify the area of contralateral perfusion and identify the factors affecting it. A retrospective study was conducted on unilateral breast reconstructions with a single perforator-based deep inferior epigastric artery perforator flap, for the period of 2017 to 2019. Data on the distance between the perforator and the umbilicus, and the grade of the midline crossing-over vessel (G0, no vessel; G1, suspicious vessel; G2, definite vessel), were collected. Contralateral perfusion was estimated using intraoperative indocyanine green angiography, and the degree of contralateral circulation based on perforator location was assessed using a response surface methodology analysis. The study included 143 patients (G0, 62; G1, 45; and G2, 36). The average length of transverse contralateral flap perfusion (contralateral circulation area/vertical height of the flap) increased as the crossing-over vessel grade increased (G0, 62.96 ± 20.33 mm; G1, 71.69 ± 20.66 mm; and G2, 81.1 ± 19.32 mm; P = 0.0002). In the response surface methodology analysis, contralateral perfusion was the least when the perforator was located near the umbilicus (G0, within a 10-mm radius; G1,