A Multicenter Prospective Real-World Effectiveness and Safety of Satralizumab in the Early Treatment of Attacks in NMOSD

Inclusion Criteria: * Diagnosis of AQP4-IgG-positive NMOSD\* and age ≥ 18 years; EDSS score ≤ 8.5 during an acute relapse in NMOSD patients; NMOSD patients experiencing an acute relapse who are scheduled to receive or are currently receiving recommended acute-phase treatments-including intravenous methylprednisolone, IVIG, PE, or PA; Receiving Satralizumab treatment; Patient understands the study procedures and has signed the informed consent form indicating willingness to participate in the study. Exclusion Criteria: * Patients with NMOSD who received other biologics (e.g., rituximab, inebilizumab, tocilizumab, eculizumab) either within the past 6 months prior to this acute exacerbation or during the current acute phase; Patients with contraindications to Satralizumab, including: known allergy to Satralizumab or any inactive ingredient, active Hepatitis B infection, active or therapy-naive latent tuberculosis; Pregnant or lactating women; Patients with concomitant Neoplasm malignant or other severe diseases; Patients currently enrolled in other interventional clinical studies; Patients assessed by the investigator/research staff as having a Critical illness or any Mental disorder or Cognitive disorder that may interfere with the study and who are unable to complete the key assessments required by this protocol; patients assessed by the investigator/research staff as unlikely to attend scheduled follow-up assessments under routine clinical care.