Analysis of an implantable venous anastomotic flow coupler: experience in head and neck free flap reconstruction.

Monitoring microvascular free flaps can present a difficult challenge. This is especially true in cases of buried or intra-oral free flaps. The authors conducted a retrospective review of 19 consecutive free flaps for head and neck reconstruction using a novel monitoring device, which combines a venous anastomotic coupler and an implantable microdoppler (Synovis Micro Companies Alliance Inc., Birmingham, AL, USA). 20 venous anastomoses were performed and monitored with the venous flow coupler device. Monitoring ranged from intra-operatively to postoperative day 7 (mean 4.2 days). Accurate flow signal interpretation was correct in 18 of 20 anastomoses (90%) but only 14 of the 20 coupled anastomoses (70%) were monitored for the complete period of time as desired by the surgeons. All 19 flaps survived. The venous anastomotic flow coupler appears to be a reliable adjunct to free flap monitoring and may help to improve it, with early detection of flap compromise and salvage.