A computer-generated program randomized patients in parallel arms to group IV : continuous infusion of lidocaine 50 mg/h ( 10 ml ) IV and saline 10 ml/h intermittently intraperitoneal ; group IP : injection of lidocaine 50 mg/h ( 10 ml ) once every hour intraperitoneally and continuous infusion of saline 10 ml/h intravenously ; and group P ( placebo ) : saline 10 ml/h both intravenously and intermittent intraperitoneal injection .