Brain and body disconnect: A retrospective case series of subacute combined degeneration of the spinal cord from chronic nitrous oxide use in Perth, Western Australia.

Background: Chronic nitrous oxide (NO) use causes inactivation of vitamin B12, resulting in neurological and psychiatric symptoms. This case series presents all NO-related presentations to the emergency department at Royal Perth Hospital between June 2019 and June 2021, alongside the costs of these admissions.

Case Presentation: Twenty-two patients were identified; 68% (n = 15) were male.

Preterm birth aetiology 2004-2008. Maternal factors associated with three phenotypes: spontaneous preterm labour, preterm pre-labour rupture of membranes and medically indicated preterm birth.

Objectives: To (1) investigate the current distribution of PTB phenotypes; (2) identify factors associated with spontaneous preterm labour (SPTL), PPROM, and indicated PTB; (3) investigate the relationship of gestational age (ga) with each PTB phenotype.

Methods: Retrospective review of all live, singleton births 23(+0) to 36(+6) weeks ga at an obstetric referral centre 2004-2008.

Results: A total of 4,522 PTBs were included (SPTL 31.