Our prior work has demonstrated the efficacy to predict pharyngocutaneous fistula using Indocyanine green (ICG) angiography. In an observational study of 41 patients who underwent salvage TL with onlay free flap reconstruction, 7 (17%) patients developed PCF. Intraoperative angiography has the ability to measure the blood flow rate (ingress) into the tissues. In patients with ingress \<15 (n=25), 24% developed a PCF. In contrast, no PCF was seen in the group with ingress \>15. Of note, in patients with ingress \<15, there was no intervention performed as this was an observational study.
