{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T20:23:39Z","timestamp":1790454219516,"version":"4.1.0"},"reference-count":31,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2021,9,6]],"date-time":"2021-09-06T00:00:00Z","timestamp":1630886400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Euro J of Neurology"],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background and purpose<\/jats:title><jats:p>Nitrous oxide misuse is a recognized issue worldwide. Prolonged misuse inactivates vitamin B12, causing a myeloneuropathy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Twenty patients presenting between 2016 and 2020 to tertiary hospitals in Sydney with myeloneuropathy due to nitrous oxide misuse were reviewed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The average age was 24\u00a0years, and mean canister consumption was 148 per day for 9\u00a0months. At presentation, paresthesias and gait unsteadiness were common, and seven patients were bedbound. Mean serum B12 was normal (258\u00a0pmol\/L, normal range [NR]\u00a0=\u00a0140\u2013750) as was active B12 (87\u00a0pmol\/L, normal\u00a0&gt;\u00a035). In contrast, mean serum homocysteine was high (51\u00a0\u03bcmol\/L, NR\u00a0=\u00a05\u201315). Spinal magnetic resonance imaging (MRI) showed characteristic dorsal column T2 hyperintensities in all 20 patients. Nerve conduction studies showed a predominantly axonal sensorimotor neuropathy (<jats:italic>n<\/jats:italic>\u00a0=\u00a05). Patients were treated with intramuscular vitamin B12, with variable functional recovery. Three of the seven patients who were bedbound at presentation were able to walk again with an aid at discharge. Of eight patients with follow\u2010up data, most had persistent paresthesias and\/or sensory ataxia. Mobility scores at admission and discharge were not significantly correlated with the serum total and active B12 levels or cumulative nitrous oxide use. There were no significant trends between serum active B12 level and cumulative nitrous oxide use (Spearman rho = \u22120.331, <jats:italic>p<\/jats:italic>\u00a0=\u00a00.195).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Nitrous oxide misuse can cause a severe but potentially reversible subacute myeloneuropathy. Serum and active B12 can be normal, while elevated homocysteine and dorsal column high T2 signal on MRI strongly suggest the diagnosis. Neurological deficits can improve with abstinence and B12 supplementation, even in the most severely affected patients.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ene.15077","type":"journal-article","created":{"date-parts":[[2021,8,24]],"date-time":"2021-08-24T08:43:35Z","timestamp":1629794615000},"page":"3938-3944","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":49,"title":["Nitrous oxide\u2010induced myeloneuropathy"],"prefix":"10.1111","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0661-7776","authenticated-orcid":false,"given":"Grace","family":"Swart","sequence":"first","affiliation":[{"name":"Department of Neurology St Vincent's Hospital Sydney New South Wales Australia"},{"name":"Department of Neurology Royal Prince Alfred Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher","family":"Blair","sequence":"additional","affiliation":[{"name":"Department of Neurology &amp; Neurophysiology Liverpool Hospital Sydney New South Wales Australia"},{"name":"South Western Sydney Clinical School University of New South Wales Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhong","family":"Lu","sequence":"additional","affiliation":[{"name":"Department of Chemical Pathology Monash Health Pathology Melbourne Victoria Australia"},{"name":"Department of Medicine Monash University Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Solomon","family":"Yogendran","sequence":"additional","affiliation":[{"name":"Department of Anaesthesia Liverpool Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanna","family":"Offord","sequence":"additional","affiliation":[{"name":"Department of Neurology Prince of Wales Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emily","family":"Sutherland","sequence":"additional","affiliation":[{"name":"Department of Neurology Royal North Shore Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephanie","family":"Barnes","sequence":"additional","affiliation":[{"name":"Department of Neurology Concord Repatriation Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalie","family":"Palavra","sequence":"additional","affiliation":[{"name":"Department of Neurology Royal North Shore Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Phillip","family":"Cremer","sequence":"additional","affiliation":[{"name":"Department of Neurology Royal North Shore Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel","family":"Bolitho","sequence":"additional","affiliation":[{"name":"Department of Neurology St Vincent's Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabor","family":"Michael Halmagyi","sequence":"additional","affiliation":[{"name":"Department of Neurology Royal Prince Alfred Hospital Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,9,6]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00415-018-8801-3"},{"key":"e_1_2_10_3_1","doi-asserted-by":"crossref","first-page":"2","DOI":"10.1016\/B978-1-4557-4547-0.00001-3","volume-title":"Handbook of Nitrous Oxide and Oxygen Sedation 4th edition","author":"Clark MS","year":"2015"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.neurol.2019.10.005"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.3390\/jcm8040551"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/ajad.12372"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00415-019-09600-w"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.braindev.2018.12.003"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMcp1113996"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jemermed.2010.04.020"},{"issue":"2","key":"e_1_2_10_11_1","first-page":"129","article-title":"Subacute combined degeneration caused by nitrous oxide intoxication: case reports","volume":"20","author":"Lin RJ","year":"2011","journal-title":"Acta Neurol Taiwan"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.2174\/1874473711666181008163107"},{"key":"e_1_2_10_13_1","volume-title":"\u2018Inhaled Anesthetics\u2019, in Stoelting's Pharmacology and Physiology in Anesthetic Practice","author":"Flood P","year":"2015"},{"key":"e_1_2_10_14_1","first-page":"49","volume-title":"Anaesthetic agents and medical gases. 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