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