IV Acetaminophen for Postoperative Analgesia

The recent clinical development of an intravenous (IV) acetaminophen formulation for use in
the US has important implications for the management of postoperative pain given its safety
profile and suitability for use in the early phase of the postoperative period. In clinical
studies a significant opioid-sparing effect has been documented with a substantial
percentage of patients avoiding the need for opioid rescue medication altogether. This
avoidance or delay in the use of opioids has been shown to reduce undesirable side effects.
It is proposed that the use of IV acetaminophen in the post anesthesia care unit (PACU) for
postoperative analgesia after laparoscopic cholecystectomy will result in decreased
incidence of post operative nausea and vomiting (PONV) and decreased use of narcotics.

Inclusion Criteria:

- Subject is undergoing pre-scheduled laparoscopic cholecystectomy;

- American Society of Anesthesiology patient classification status I-II

Exclusion Criteria:

- Regular preoperative use of or opioids,

- Subjects admitted after surgery for postoperative complications other than
postoperative pain or PONV.

- Subjects converted to open laparoscopic cholecystectomy

- Known allergy/hypersensitivity to acetaminophen

- Use of opioids prior to commencement of the study (<7 days)

- Patients with chronic pain conditions or disease requiring pain control

- Abnormal liver function

- Known or suspected alcohol, drug or opiate abuse or dependence

- Patients with a BMI of greater than 35

- Other physical, mental or medical conditions that could effect participation.

- Abnormal renal function; serum creatinine>2gm/dl