Exploring the Association of Reproductive History With the Development and Course of Neuromyelitis Optica Spectrum Disorder Publisher Pubmed



Hadinejad M¹ ; Masoudi M¹ ; Sahraian MA¹ ; Mozdabadi RSK¹ ; Aliabadi HR⁴ ; Shahmohammadi S¹ ; Rezaeimanesh N¹ ; Moghadasi AN¹ Show Affiliations
Source: Clinical Neurology and Neurosurgery Published:2022

Abstract

Background: women of childbearing age are at higher risk for developing Neuromyelitis Optica Spectrum Disorder (NMOSD). Post-onset pregnancy is believed to affect and be affected by NMOSD. This study aimed to assess the effect of pregnancy on the development and course of NMOSD. Method: All women from the patient registry of the neurology outpatient clinic in Tehran, Iran, who were diagnosed with NMOSD without any comorbidity were enrolled in this survey. Retrospectively, the participants’ reproductive history was collected, and the association of pregnancy-related factors with the age of onset, attack rate, and disability status was sought. Results: The age at first attack was significantly higher in patients with prior pregnancy (P < 0.001). To eliminate the immortal time bias, the researchers assessed the effect of pregnancy as a time-varying exposure in the time-dependent Cox model, which indicated that pregnancy did not alter the time of developing NMOSD (Hazard Ratio=0.91, P = 0.741). However, more than one-fourth of patients with pregnancy before NMOSD onset had their first attack within the year of delivery. In addition, younger age at disease onset was accompanied by a shorter interval between the first pregnancy and first attack (Spearman's rho=0.826, P < 0.001). Conclusion: NMOSD onset or prognosis seemed not to be affected by pregnancy before the disease onset. However, in women with early disease onset, pregnancy might be a trigger for the development of NMOSD. © 2022 Elsevier B.V.