{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T05:06:15Z","timestamp":1788930375494,"version":"build-2803163510"},"reference-count":36,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"2","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2021,8]]},"abstract":"\n BACKGROUND:<\/jats:title>\n Intraoperative methadone, a long-acting opioid, is increasingly used for postoperative analgesia, although the optimal methadone dosing strategy in children is still unknown. The use of a single large dose of intraoperative methadone is controversial due to inconsistent reductions in total opioid use in children and adverse effects. We recently demonstrated that small, repeated doses of methadone intraoperatively and postoperatively provided sustained analgesia and reduced opioid use without respiratory depression. The aim of this study was to characterize pharmacokinetics, efficacy, and safety of a multiple small-dose methadone strategy.<\/jats:p>\n <\/jats:sec>\n \n METHODS:<\/jats:title>\n Adolescents undergoing posterior spinal fusion (PSF) for idiopathic scoliosis or pectus excavatum (PE) repair received methadone intraoperatively (0.1 mg\/kg, maximum 5 mg) and postoperatively every 12 hours for 3\u20135 doses in a multimodal analgesic protocol. Blood samples were collected up to 72 hours postoperatively and analyzed for R-methadone and S-methadone, 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidene (EDDP) metabolites, and alpha-1 acid glycoprotein (AAG), the primary methadone-binding protein. Peak and trough concentrations of enantiomers, total methadone, and AAG levels were correlated with clinical outcomes including pain scores, postoperative nausea and vomiting (PONV), respiratory depression, and QT interval prolongation.<\/jats:p>\n <\/jats:sec>\n \n RESULTS:<\/jats:title>\n \n The study population included 38 children (10.8\u201317.9 years): 25 PSF and 13 PE patients. Median total methadone peak plasma concentration was 24.7 (interquartile range [IQR], 19.2\u201340.8) ng\/mL and the median trough was 4.09 (IQR, 2.74\u20136.4) ng\/mL. AAG concentration almost doubled at 48 hours after surgery (median = 193.9, IQR = 86.3\u2013279.5 \u00b5g\/mL) from intraoperative levels (median = 87.4, IQR = 70.6\u2013115.8 \u00b5g\/mL;\n P<\/jats:italic>\n < .001), and change of AAG from intraoperative period to 48 hours postoperatively correlated with R-EDDP (\n P<\/jats:italic>\n < .001) levels, S-EDDP (\n P<\/jats:italic>\n < .001) levels, and pain scores (\n P<\/jats:italic>\n = .008). Median opioid usage was minimal, 0.66 (IQR, 0.59\u20130.75) mg\/kg morphine equivalents\/d. No respiratory depression (95% Wilson binomial confidence, 0\u20130.09) or clinically significant QT prolongation (median = 9, IQR = \u221210 to 28 milliseconds) occurred. PONV occurred in 12 patients and was correlated with morphine equivalent dose (\n P<\/jats:italic>\n = .005).\n <\/jats:p>\n <\/jats:sec>\n \n CONCLUSIONS:<\/jats:title>\n Novel multiple small perioperative methadone doses resulted in safe and lower blood methadone levels, <100 ng\/mL, a threshold previously associated with respiratory depression. This methadone dosing in a multimodal regimen resulted in lower blood methadone analgesia concentrations than the historically described minimum analgesic concentrations of methadone from an era before multimodal postoperative analgesia without postoperative respiratory depression and prolonged corrected QT (QTc). Larger studies are needed to further study the safety and efficacy of this methadone dosing strategy.<\/jats:p>\n <\/jats:sec>","DOI":"10.1213\/ane.0000000000005366","type":"journal-article","created":{"date-parts":[[2021,1,21]],"date-time":"2021-01-21T16:23:56Z","timestamp":1611246236000},"page":"327-337","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":31,"title":["A Novel Perioperative Multidose Methadone-Based Multimodal Analgesic Strategy in Children Achieved Safe and Low Analgesic Blood Methadone Levels Enabling Opioid-Sparing Sustained Analgesia With Minimal Adverse Effects"],"prefix":"10.1213","volume":"133","author":[{"given":"Senthilkumar","family":"Sadhasivam","sequence":"first","affiliation":[{"name":"Department of Anesthesia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Blessed W.","family":"Aruldhas","sequence":"additional","affiliation":[{"name":"Department of Anesthesia"},{"name":"Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana"},{"name":"Department of Pharmacology & Clinical Pharmacology, Christian Medical College, Vellore, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Senthil","family":"Packiasabapathy","sequence":"additional","affiliation":[{"name":"Department of Anesthesia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian R.","family":"Overholser","sequence":"additional","affiliation":[{"name":"Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana"},{"name":"Department of Pharmacy Practice, Purdue University College of Pharmacy, Indianapolis, Indiana"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengyue","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Biostatistics"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Zang","sequence":"additional","affiliation":[{"name":"Department of Biostatistics"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janelle S.","family":"Renschler","sequence":"additional","affiliation":[{"name":"Department of Anesthesia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryan E.","family":"Fitzgerald","sequence":"additional","affiliation":[{"name":"Division of Pediatric Orthopedic Surgery, Department of Orthopedic Surgery"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sara K.","family":"Quinney","sequence":"additional","affiliation":[{"name":"Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana"},{"name":"Department of Obstetrics and Gynecology"},{"name":"Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, 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