• Kathleen Bastian, Philipp K Buehler, Dovile Slizyte, Christoph A Rüst, Katharina Toft, Wolfgang Studer, Leopold Lecheler, José Aguirre, Martin Siegemund, and Alexa Hollinger.
• Department for Anesthesia, Surgical Intensive Care, Prehospital Emergency Medicine and Pain Therapy, University Hospital Basel, Basel, Switzerland.
• Minerva Anestesiol. 2019 Oct 1; 85 (10): 1053-1061.

BackgroundData from patient questionnaires reveal that the intensity of postoperative pain is widely underestimated. Insufficient pain control may contribute to impaired short- and long-term outcome. Preoperative administration of methadone might potentially improve postoperative pain control due to its long pharmacological half-life.MethodsThe aim of this study was to evaluate the effect of a single dose of methadone administered at anesthesia induction on postoperative analgesic requirements in ASA I-III patients after moderate-to-severely painful surgery scheduled for ≥90 minutes. Patients were randomized to receive either a single dose of methadone (0.2 mg/kg) or fentanyl (standard, 0.003 mg/kg) intravenously (IV) at anesthesia induction. For postoperative pain control, all study patients were accommodated with morphine on the basis of patient-controlled analgesia (PCA).ResultsPer-protocol analysis revealed that the median cumulative morphine consumption was significantly lower in patients receiving a single dose of methadone, in the Postanesthesia Care Unit (0 mg vs. 7 mg of morphine, P<0.01) and during the first 72 hours after surgery (19 mg vs. 35 mg of morphine, P<0.05 for all days). Fentanyl consumption during surgery (0.25 mg [0.1-0.425 mg] in the study group vs. 0.3 mg [0.15-0.45 mg] in the control group, P=0.4499) was comparable among groups. Median pain scores at rest and in motion, and patient satisfaction were also similar in both groups (95.7% vs. 89.3% of patients were satisfied in the study and control group, respectively) during follow-up on postoperative days 1-3.ConclusionsA single dose of methadone administered at anesthesia induction prior to moderate-to-severely painful surgery is a possible strategy to reduce postoperative morphine consumption.

27 keywords...

hide…