Bilateral TAP and RS Blocks Using Liposomal Bupivacaine/Bupivacaine vs. Regular Bupivacaine in Laparoscopic Colectomy

To compare the highest (worst) pain reported for the period of 48-72 hours post-surgery.

To compare the highest (worst) pain reported for the period of 48-72 hours post-surgery by patients in the two groups, using the Brief Pain Inventory (Short Form), this measurement will be done at the 26th and 50th postoperative hour with a range on +3/-2 hours.

Proportion of patients experiencing moderate or severe pain, the scores will be grouped such that 1-3 is considered mild pain, 4-6 moderate pain, and 7-10 severe pain.

Postoperative total opioid consumption measured in morphine MilliEquivalent (MME) will be collected starting from the time in post-anaesthesia care unit up to the first 6 postoperative days. Patients will continue to report their opioid consumption after discharge days using the pain and medication diary up to 6 days post-surgery.

Using a validated measure; the Simplified (Post-operative nausea and vomiting Impact Scale 17 which consists of two questions, each with a possible response score of 0-3. Response score totals of 0-2 require no intervention. Response score totals of 3-4 may necessitate antiemetic medication. Response score totals of 5-6 are considered clinically important nausea requiring medication intervention, as this would constitute patients with excessive vomiting. This form will be completed either by the assigned nurse or the study coordinator immediately after surgery in the post-anesthesia care unit, postoperative day#1, postoperative day#2, postoperative day#3, and during the first follow up visit.

Hospital length of stay will be calculated in hours from the date and time of admission and discharge from the electronic medical records. post-anesthesia care unit length of stay will be calculated in minutes using the post-anesthesia care unit data collection sheet and from the electronic medical records.

The preoperative sensory function test will be assessed prior to the block by the anesthesiologist performing the block while the postoperative assessment at the post-anesthesia care unit will be used as baseline to be compared with the following sensory tests to assess the duration of sensory nerve block, using post-anesthesia care unit and In-Patient Post-Operative Data Collection Sheet.

A validated scale that rapidly assesses pain severity and its impact on functioning. It consists of a 2-page questionnaire that asks patients to report the location and severity of their pain, and to report the interference of pain, if any, on their activities over the previous 24 hours. Four questions ask patients to rate the severity of their pain on a scale of 1-10 over the previous 24 hours in 4 discrete categories: worst, least, average, and right now. Each rating is analyzed separately. Seven questions ask patients to rate how severely their pain has interfered with their general activity, mood, walking ability, normal work, relations with other people, sleep, and enjoyment of life on a scale of 1-10 over the previous 24 hours. These 7 questions are scored as a mean of the answers given, as long as at least 4 questions are answered. Two other questions ask patients to list the treatments or medications they are currently using, and to rate how much relief these are providing.

The occurrence of block complications will be collected intraoperative and postoperative period including post-anesthesia care unit, daily in patient period, the day of discharge, and at the time of the post-operative follow-up visit. Readmissions within 30 days after discharge will also be collected.

A scale from 0 = very dissatisfied to 10 = very satisfied, this will be evaluated on day of discharge and on the first postoperative clinic visit either in person or through a phone call.