Thereafter the wound was infiltrated with a solution of ropivacaine 0.5 % 40 ml , then a multi-hole 16 G catheter was placed subcutaneously and an infusion of ropivacaine 0.2 % 5 ml h ( -1 ) was maintained for 55 h. Visual analogue scale scores were assessed at rest and on passive mobilization by nurses blinded to analgesic treatment .
