Abstract
The recreational use of nitrous oxide (N(2)O) as "laughing gas" is a growing problem. The chronic toxicity of N(2)O is mainly due to its ability to oxidize vitamin B12, making it dysfunctional as a cofactor in metabolic pathways. This mechanism plays a major role in the development of neurological disorders in N(2)O users. The assessment of vitamin B12 status in N(2)O users is important but challenging due to the lack of decrease in total vitamin B12 in most cases despite genuine vitamin B12 functional deficiency. Other biomarkers, such as holotranscobalamin (holoTC), homocysteine (tHcy) and methylmalonic acid (MMA), are interesting candidates to properly assess vitamin B12 status. Here, we conducted a systematic review of case series in order to assess the prevalence of abnormal values of total vitamin B12, holoTC, tHcy and MMA in recreational N(2)O users, which is an important prerequisite for determining the best screening strategy in future guidelines. We included 23 case series (574 N(2)O users) from the PubMed database. Total circulating vitamin B12 concentration was low in 42.2% (95% confidence interval 37.8-46.6%, n = 486) of N(2)O users, while 28.6% (7.5-49.6%, n = 21) of N(2)O users had low circulating concentrations of holoTC. tHcy levels were elevated in 79.7% (75.9-83.5%, n = 429) of N(2)O users, while 79.6% (71.5-87.7%, n = 98) of N(2)O users had increased concentrations of MMA. In summary, the increases in tHcy and MMA were the most prevalent abnormalities, and should be measured alone or in combination in symptomatic N(2)O users rather than total vitamin B12 or holoTC.