[Thinning of the deep inferior epigastric artery perforator flap based on the vascular structure of the arterial perforator].

Objective: To explore flap thinning based on the study of the arterial structure and blood perfusion of the deep inferior epigastric artery perforator (DIEP) flap using computed tomography (CT) angiography.

Methods: Clinical imaging study: Preoperative CT angiography was performed in 15 patients with DIEP flap reconstruction to investigate the vascular structure of arterial perforator. Cadaveric imaging study:10 abdominal specimens harvested from fresh cadavers were cannulated with trocar and injected with contrast medium in the deep inferior epigastric artery perforator. During the perfusion of the contrast medium in the flap,the flap was scanned by three-dimensional CT. The CT data was then sent to CT workstation and the images were processed and reformatted to study the vascular structure of arterial perforators and the blood perfusion.

Results: 75 artery perforators in clinical study and 40 artery perforators in cadaveric study were chosen and analyzed. The major deep inferior epigastric artery perforators run directly across the deep layer of adipose tissue without bifurcating beneath the Scarpa's fascia. Above the Scarpa's fascia, the artery perforators bifurcate and ultimately terminate in the subdermal vascular plexus. Blood perfusion mode: The subdermal vascular plexus served as the only pathway for blood perfusion between perforasomes. There are two different pathways for blood perfusion in the perforasome: the subdermal plexus and the existing vascular structure of perforator.

Conclusions: Based on the vascular structure of arterial perforator and blood perfusion of the DIEP flap, thinning of the DIEP flap under the Scarpa's fascia is safe while thinning above the Scarpa's fascia should performed according to the blood supply zone of the DIEP flap.