Continous Popliteal Block for Microvascular Free Flap Reconstruction in Ear, Nose and Throat Surgery

Active substance. Levobupivacaine 3.75 mg/ml 15 ml is given as a bolus injection at start of surgery, followed by ropivacaine 2 mg/ml continous infusion 5-8 ml/h from the end of surgery until end of intervention at the fourth to seventh postoperative day.

Placebo. Saline solution (NaCl 0.9%) is given in equivalent intervals and doses as the active substances.