patients were enrolled into 2 groups. in one group the wound was installed by 40ml of 0.25% bupivacaine through axillary and chest wall drains (20ml in each drain). Then, the drains were clamped for 20 minutes.
in the other group the wound was installed by 40ml of 0.9% normal saline through axillary and chest wall drains (20ml in each drain). Then, the drains were clamped for 20 minutes. (placebo group) patients and health care providers were blinded as regard the study group patients enrolled in. Visual Analog Pain Scale which is a score for detection of how much the patient is annoyed from the pain- was assessed two and four hours post-operative then every four hours thereafter.
