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Abstract Details

Long-Term Psychiatric Symptoms in Autoimmune Encephalitis Remission
Autoimmune Neurology
P2 - Poster Session 2 (9:00 AM-3:00 PM)
030

To identify the prevalence of self-reported symptoms of depression and anxiety among patients in remission from autoimmune encephalitis (AE).
Although prior studies have found a high prevalence of residual cognitive deficits among patients in remission from AE, there is a paucity of data on long-term psychiatric outcomes for this patient population. In normal populations, median Patient Health Questionaire-9 (PHQ9) and General Anxiety Disorder-7 (GAD7) scores were reported to be, respectively, around 3 and 2, with prevalence of depressive and anxiety symptoms on these questionnaires reported as around 24% and 23%.

Retrospective cross-sectional cohort study at a tertiary center AE clinic between 2012-01-01 and 2021-12-31. Patients were contacted via phone or regular follow-up and completed the PHQ9 and GAD7. 
Forty-one patients were contacted; 29 responded (71%) and were included. Seventeen (59%) were female. Median age was 32.5 years (range 5-77). Autoantibody results were N-methyl-D-aspartate receptor (n=14, 48%), negative (n=7, 24%), leucine-rich glioma-inactivated 1 (n=6, 21%), and contactin-associated protein-like 2 (n=1, 3%). Median time from disease onset to questionnaire collection was 6.3 years (range 1.5-23.0). Ten patients (37%) were experiencing symptoms of depression as measured by the PHQ9, with six (60%) reporting moderate-to-severe symptoms. Median PHQ9 score was 3 (range 0-18). Six patients (22%) were experiencing symptoms of anxiety on the GAD7, with one (17%) reporting moderate-to-severe symptoms. Median GAD7 score was 2 (range 0-10). Eight patients (28%) reported a psychiatric history prior to the onset of AE, which was associated with increased PHQ9 scores (p=0.04, Wilcoxon rank sum test). 
The prevalence of self-reported depressive and anxious symptoms in this cohort in remission from AE was similar to general populations. Patients with a psychiatric history that preceded onset of AE had higher PHQ9 scores. These results may be affected by censoring bias and lower sensitivity of self-reported diagnostic tools.
Authors/Disclosures
Ramy S. Gabarin
PRESENTER 		Mr. Gabarin has nothing to disclose.
Julien Hebert, MD (Toronto Western Hospital (University Health Network)) Dr. Hebert has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Paladin Labs. Dr. Hebert has received personal compensation in the range of $500-$4,999 for serving as an Expert Witness for Gowling WLG. The institution of Dr. Hebert has received research support from Praxis Precision Medicine.
Seth A. Climans, MD (London Health Sciences Centre) Dr. Climans has nothing to disclose.
Alexandra Muccilli, MD (Saint Michael's Hospital - Multiple Sclerosis Clinic) Dr. Muccilli has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Biogen. Dr. Muccilli has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Novartis. Dr. Muccilli has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for EMD Serono. Dr. Muccilli has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Alexion.
Sydney Lee, MD (Adult Neurology Program, University of Toronto) Dr. Lee has nothing to disclose.
Gregory S. Day, MD, MSc, FAAN (Mayo Clinic) Dr. Day has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Arialys Therapeutics. Dr. Day has received personal compensation in the range of $500-$4,999 for serving as an Editor, Associate Editor, or Editorial Advisory Board Member for DynaMed (EBSCO Health). Dr. Day has or had stock in ANI Pharmaceuticals. The institution of Dr. Day has received research support from National Institutes of Health / NIA. The institution of Dr. Day has received research support from National Institutes of Health / NINDS. The institution of Dr. Day has received research support from Amgen Pharmaceuticals. The institution of Dr. Day has received research support from AVID Radiopharmaceuticals. Dr. Day has received personal compensation in the range of $500-$4,999 for serving as a Presenter at Annual Meeting (CME) with 好色先生. Dr. Day has received personal compensation in the range of $500-$4,999 for serving as a Content Development (CME) with PeerView, Inc. Dr. Day has received personal compensation in the range of $5,000-$9,999 for serving as a Content Development (CME) with Continuing 好色先生, Inc. Dr. Day has received personal compensation in the range of $5,000-$9,999 for serving as a Content Development (CME) with Ionis Pharmaceuticals. Dr. Day has received personal compensation in the range of $500-$4,999 for serving as a 好色先生al Case Development + Presentation (video) with PeerDirect (P\S\L Group). Dr. Day has received personal compensation in the range of $500-$4,999 for serving as a Content Development / Presentation (non-CME) with MJH Life Sciences (NeurologyLive). Dr. Day has a non-compensated relationship as a Clinical Director with Anti-NMDA Receptor Encephalitis Foundation that is relevant to AAN interests or activities.
No disclosure on file
David F. Tang-Wai, MD, FRCPC (Toronto Western Hospital/University Health Network) Dr. Tang-Wai has nothing to disclose.