Analysis of free flap viability based on recipient vein selection.

ABSTRACT

BACKGROUND: Venous anastomotic failure is the primary reason for microvascular free tissue transfer failure. Donor and recipient veins can be oriented in the same longitudinal axis (end-to-end anastomosis), or the donor vein can be anastomosed to the internal jugular vein in an end-to-side configuration. No consensus on the optimal anastomosis configuration exists. We sought to evaluate whether type of venous anastomosis impacts flap survival rate. METHODS: Data were collected on all patients undergoing microvascular free flap reconstruction of head and neck defects at the University of Washington between August 1993 and April 2007. Flaps with a single venous anastomosis were analyzed. Flaps were stratified into those with end-to-end and end-to-side anastomoses. Survival rates were compared between groups using bivariate and multivariate techniques. RESULTS: Inclusion criteria were met by 786 free flaps; 87% performed in an end-to-end and 13% in an end-to-side configuration. Flap re-exploration and failure rate were 4.3% and 1.1%, respectively. In multivariate analysis, there was no difference in odds of flap re-exploration (OR .70, 95% CI .23-2.18) or flap failure whether or not an end-to-end or end-to-side anastomosis was performed (OR 2.09, 95% CI .38-11.5). CONCLUSIONS: In this large cohort of patients, we found no difference in the odds of flap re-exploration or failure based on venous anastomotic configuration. Reconstructive surgeons should have both anastomotic techniques in their repertoire to optimize the success of every flap.