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Journal Article
Observational Study
A Prospective Observational Study of Autoimmune Encephalitis in Northwestern India.
Journal of the Association of Physicians of India 2023 September
OBJECTIVES: Autoimmune encephalitis (AIE) is a group of rare, increasingly recognized, potentially reversible, noninfectious causes of unexplained encephalitis. It affects any age-group and has a plethora of clinical presentations, the most common being the neuropsychiatric manifestation. The diagnosis of this entity at the right time and proper treatment with immunotherapy can save many lives. In this study, we describe the demographic profile, clinical spectrum, diagnosis, and treatment of 42 patients with features of AIE.
MATERIALS AND METHODS: This is a prospective study where 42 cases were selected from a tertiary care center in Northwestern India. Patients with suspected AIE underwent detailed clinical assessment, routine blood tests, magnetic resonance imaging (MRI) brain, electroencephalography (EEG), cerebrospinal fluid (CSF) study, and autoimmune profile in blood and CSF. Screening for malignancy was done in all patients with computer tomography (CT) thorax and abdomen and tumor markers.
RESULTS: Among 42 patients, males, and females were almost equally affected. The mean age of onset was 31 years. Anti-N-methyl-D-aspartate receptor (anti-NMDAR) Encephalitis was the commonest of all AIE (57%) followed by anti-leucine-rich glioma inactivated-1 (anti-LGI-1) related AIE (11.9%), anti-contactin-associated protein 2 (anti-CASPR2) related AIE (4.7%), and steroid-responsive encephalopathy associated with autoimmune thyroiditis (SREAT) related to antithyroid peroxidase (anti-TPO) antibody (2.3%). Neuropsychiatric manifestation is the commonest. The seizure was noted in around 72% of patients, the commonest in the anti-NMDAR group. Faciobrachial dystonic seizure (FBDS) was noted in all five anti-LG1-1 encephalitis patients. CSF abnormalities were seen in 33.3% of patients in the form of pleocytosis or raised protein, or both. MRI abnormality was seen in 52% of patients. EEG was abnormal in 10% of patients, and delta brush was noted in three anti-NMDAR patients. All patients received immunotherapy in the form of intravenous immunoglobulin (IVIg) or pulse IV methylprednisolone (IVMPS), or both. Two patients nonresponsive to IVIg and IVMPS received rituximab. Almost all patients responded to immunotherapy.
CONCLUSION: Autoimmune encephalitis (AIE), a potentially treatable immune-responsive entity, is a common neurological problem and may be an answer to a large number of cases having unexplained encephalitis. Good clinical acumen and knowledge are required for early diagnosis and treatment of this potentially reversible disorder. How to cite this article: Sharma B, Paul M, Bagaria AK. A Prospective Observational Study of Autoimmune Encephalitis in Northwestern India. J Assoc Physicians India 2023;71(9):39-44.
MATERIALS AND METHODS: This is a prospective study where 42 cases were selected from a tertiary care center in Northwestern India. Patients with suspected AIE underwent detailed clinical assessment, routine blood tests, magnetic resonance imaging (MRI) brain, electroencephalography (EEG), cerebrospinal fluid (CSF) study, and autoimmune profile in blood and CSF. Screening for malignancy was done in all patients with computer tomography (CT) thorax and abdomen and tumor markers.
RESULTS: Among 42 patients, males, and females were almost equally affected. The mean age of onset was 31 years. Anti-N-methyl-D-aspartate receptor (anti-NMDAR) Encephalitis was the commonest of all AIE (57%) followed by anti-leucine-rich glioma inactivated-1 (anti-LGI-1) related AIE (11.9%), anti-contactin-associated protein 2 (anti-CASPR2) related AIE (4.7%), and steroid-responsive encephalopathy associated with autoimmune thyroiditis (SREAT) related to antithyroid peroxidase (anti-TPO) antibody (2.3%). Neuropsychiatric manifestation is the commonest. The seizure was noted in around 72% of patients, the commonest in the anti-NMDAR group. Faciobrachial dystonic seizure (FBDS) was noted in all five anti-LG1-1 encephalitis patients. CSF abnormalities were seen in 33.3% of patients in the form of pleocytosis or raised protein, or both. MRI abnormality was seen in 52% of patients. EEG was abnormal in 10% of patients, and delta brush was noted in three anti-NMDAR patients. All patients received immunotherapy in the form of intravenous immunoglobulin (IVIg) or pulse IV methylprednisolone (IVMPS), or both. Two patients nonresponsive to IVIg and IVMPS received rituximab. Almost all patients responded to immunotherapy.
CONCLUSION: Autoimmune encephalitis (AIE), a potentially treatable immune-responsive entity, is a common neurological problem and may be an answer to a large number of cases having unexplained encephalitis. Good clinical acumen and knowledge are required for early diagnosis and treatment of this potentially reversible disorder. How to cite this article: Sharma B, Paul M, Bagaria AK. A Prospective Observational Study of Autoimmune Encephalitis in Northwestern India. J Assoc Physicians India 2023;71(9):39-44.
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