Effect on patients recovery after surgery 3.3.1. Postoperative infection rate 3.3.2 Number of days in hospital after surgery Figure 3.10: Kaplan - Meier of three group about days length of stay 3.4 Effects on respiratory, hemodynamic functions and side effects 3.4.3. Side effects The most side effects seen in all three groups are nausea (9, 2%), pruritus (14, 2%).