Conditions: Osteoarthritis
Keywords: acetaminophen timing arthroplasty
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 126
Healthy volunteers: no

Brief summary:
The purpose of the study is to examine the effects of timing of administration of intravenous (IV) acetaminophen and how timing relates to analgesic efficacy as measured by postoperative pain scores. A maximum of 138 patients meeting inclusion criteria who present for a scheduled total hip replacement under general anesthesia will be randomized into one of two arms: 1) the pre-closure group will receive the first dose administered upon onset of skin closure, 2) the preemptive group will receive the first dose administered within 60 minutes prior to incision. Both groups will receive subsequent doses every 6 hours x 24 hours.

Detailed description:
The purpose of the study is to examine the effects of timing of administration of intravenous (IV) acetaminophen and how timing relates to analgesic efficacy as measured by postoperative pain scores. A maximum of 138 patients meeting inclusion criteria who present for a scheduled total hip replacement under general anesthesia will be randomized into one of two arms: 1) the closure group will receive the first dose of one gram of intravenous acetaminophen administered upon onset of skin closure, 2) the preemptive group will receive the first dose of one gram of intravenous acetaminophen administered within 60 minutes prior to incision. Both groups will receive subsequent doses of one gram of intravenous acetaminophen every 6 hours x 24 hours. The maximum dose in a 24 hour period will not exceed 4 grams according to FDA recommendations.

Arms:
arm 1: The preemptive group will receive one dose of 1 gram of IV acetaminophen every 6 hours x 24 hours with the first dose administered within 60 minutes prior to incision. Each infusion will be administered over 15 minutes as recommended by manufacturer package insert. arm 2: The closure group will receive one dose of 1 gram of IV acetaminophen every 6 hours x 24 hours with the first dose administered upon onset of skin closure.

Interventions: intervention 1: Acetaminophen
Intervention descriptions: intervention 1: None

Protocol document: