Long-Term Cognitive, Functional, and Patient-Reported Outcomes in Patients With Anti-NMDAR Encephalitis

Area of Science:

• Neuroimmunology
• Neuropsychology
• Clinical Neurology

Background:

• Anti-NMDA receptor (anti-NMDAR) encephalitis is a severe autoimmune condition often affecting young adults.
• While many patients regain independence, persistent cognitive and psychosocial deficits are common, impacting long-term quality of life.
• The temporal trajectory of cognitive recovery and factors influencing outcomes remain incompletely understood.

Purpose of the Study:

• To delineate the cognitive recovery trajectory in anti-NMDAR encephalitis patients over time.
• To assess self-reported outcomes, including emotional well-being, social functioning, and quality of life.
• To identify factors associated with patient outcomes and explore the relationship between cognitive function and self-reported well-being.

Main Methods:

• A large-scale, cross-sectional and prospective cohort study involving 92 patients diagnosed with anti-NMDAR encephalitis.
• Neuropsychological assessments evaluated memory, language, perception, construction, attention, and executive functions.
• Patient-reported outcome measures (PROMs) and functional outcomes (e.g., modified Rankin Scale [mRS]) were collected and analyzed.

Main Results:

• Cognitive scores improved up to 36 months post-diagnosis, with most gains in the first 6 months; however, 34% had persistent impairment beyond 36 months.
• Memory and language domains showed the most significant persistent deficits, alongside self-reported issues in emotional well-being, social functioning, energy, and quality of life.
• Thirty percent of patients did not resume work or school, associated with processing speed deficits and lower well-being scores.

Conclusions:

• Recovery from anti-NMDAR encephalitis is prolonged, potentially lasting 3 years, with a significant risk of persistent cognitive deficits (memory, language) and psychosocial sequelae.
• The modified Rankin Scale (mRS) is insufficient for fully capturing the spectrum of patient outcomes.
• Impaired return to work/education is common and linked to cognitive deficits and reduced well-being, highlighting the need for comprehensive rehabilitation strategies.