Intravenous Lidocaine Infusion in the Management of Post-operative Pain in Colorectal Patients

The purpose of this study is to determine if an intravenous lidocaine infusion (compared to placebo) intraoperatively will decrease time to return of bowel function postoperatively, decrease postoperative pain, diminish postoperative opioid requirement, minimize inflammatory markers and shorten time to discharge after colorectal surgery.

Lidocaine is an amide local anesthetic that has analgesic and anti-inflammatory properties. Lidocaine infusion is a very useful pain medication that is underutilized to treat surgical, chronic, and cancer pain in children. The investigators propose to examine the perioperative use of lidocaine infusion in children undergoing colorectal surgery that involves an abdominal incision. The investigators plan to measure the following outcomes: length of stay in hospital following abdominal surgery, postoperative pain scores, cumulative morphine consumption, incidences of opioid adverse-effects: respiratory depression, sedation, nausea, vomiting, time to passage of flatus, time to first bowel movement and end-tidal Sevoflurane in operating room throughout surgery. The following laboratory values will be measured: serial lidocaine levels of pharmacokinetics and safety levels, Pro- and anti-inflammatory cytokine measurements: IL-6, IL-8, IL-10, IL-1RA and genetic variants.

The treatment group will receive a 1.5mg/kg intravenous lidocaine bolus over 10 minutes. The bolus will be followed by an intravenous lidocaine infusion of 1 mg/kg/hr. The infusion will be stopped after extubation prior to leaving the operating room or after 5 hours from the start of the infusion

The saline will be administered over an infusion pump over 10 minutes and followed by a bolus. The infusion will be stopped after extubation prior to leaving the operating room or after 5 hours from the start of the infusion.

The treatment group will receive a 1.5mg/kg intravenous lidocaine bolus over 10 minutes after induction by means of an infusion pump. This bolus will be followed by an intravenous lidocaine infusion of 1 mg/kg/hr. The infusion will be stopped after extubation prior to leaving the operative room or after 5 hours from the start of the infusion, which ever comes first.

The primary outcome measure will be to monitor the length of stay in hospital following abdominal surgery.

Study staff will monitor patients pain every 15 minutes in the PACU and record documentation every 4 hours while on the floor.

2 samples will be drawn at time of baseline IV placement Blood draw 0-3 minutes after bolus is complete Blood draw 9-15 minutes after the bolus is complete 2 blood samples will be drawn at the end of continuous infusion (either at end of surgery after extubation prior to leaving OR or after 5 hours from the start of the infusion) Blood draw 1 hour following the infusion Blood draw 2-3 hours following the end of the infusion 2 blood samples will be drawn 24 hours after surgery dependent of necessary labs

participants will be measured until the end of the OR case, on average 6 hours and 24 hours post-operatively

2 samples will be drawn at time of baseline IV placement Blood draw 0-3 minutes after bolus is complete Blood draw 9-15 minutes after the bolus is complete 2 blood samples will be drawn at the end of continuous infusion (either at end of surgery after extubation prior to leaving OR or after 5 hours from the start of the infusion) Blood draw 1 hour following the infusion Blood draw 2-3 hours following the end of the infusion 2 blood samples will be drawn 24 hours after surgery dependent of necessary labs

participants will be measured until the end of the OR case, on average 6 hours and 24 hours post-operatively

2 samples will be drawn at time of baseline IV placement Blood draw 0-3 minutes after bolus is complete Blood draw 9-15 minutes after the bolus is complete 2 blood samples will be drawn at the end of continuous infusion (either at end of surgery after extubation prior to leaving OR or after 5 hours from the start of the infusion) Blood draw 1 hour following the infusion Blood draw 2-3 hours following the end of the infusion 2 blood samples will be drawn 24 hours after surgery dependent of necessary labs

participants will be measured until the end of the OR case, on average 6 hours and 24 hours post-operatively

Inclusion Criteria: male or female children 1-15 years of age ASA physical status 1-3 scheduled for colorectal surgery with abdominal incision scheduled for complex urology surgical case Exclusion Criteria: ASA physical status > 3 postoperative intubation planned ahead of surgery history of chronic use of opioid history of hepatic,renal, or cardiac failure history of organ transplant BMI > 30 history of cardiac arrhythmia history of long QT syndrome history of allergic reaction to lidocaine or similar agents history of seizure disorder patient without Peripherally Inserted Central Catheter or other central access with contraindication to inhalation induction family history or know patient susceptibility to malignant hyperthermia

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