Clinical presentation, etiology, and survival in adult acute encephalitis syndrome in rural Central India.

Abstract:

BACKGROUND:Acute encephalitis syndrome (AES) is a constellation of symptoms that includes fever and altered mental status. Most cases are attributed to viral encephalitis (VE), occurring either in outbreaks or sporadically. We conducted hospital-based surveillance for sporadic adult-AES in rural Central India in order to describe its incidence, spatial and temporal distribution, clinical profile, etiology and predictors of mortality. METHODS:All consecutive hospital admissions during the study period were screened to identify adult-AES cases and were followed until 30-days of hospitalization. We estimated incidence by administrative sub-division of residence and described the temporal distribution of cases. We performed viral diagnostic studies on cerebrospinal fluid (CSF) samples to determine the etiology of AES. The diagnostic tests included RT-PCR (for enteroviruses, HSV 1 and 2), conventional PCR (for flaviviruses), CSF IgM capture ELISA (for Japanese encephalitis virus, dengue, West Nile virus, Varicella zoster virus, measles, and mumps). We compared demographic and clinical variables across etiologic subtypes and estimated predictors of 30-day mortality. RESULTS:A total of 183 AES cases were identified between January and October 2007, representing 2.38% of all admissions. The incidence of adult AES in the administrative subdivisions closest to the hospital was 16 per 100,000. Of the 183 cases, a non-viral etiology was confirmed in 31 (16.9%) and the remaining 152 were considered as VE suspects. Of the VE suspects, we could confirm a viral etiology in 31 cases: 17 (11.2%) enterovirus; 8 (5.2%) flavivirus; 3 (1.9%) Varicella zoster; 1 (0.6%) herpesvirus; and 2 (1.3%) mixed etiology); the etiology remained unknown in remaining 121 (79.6%) cases. 53 (36%) of the AES patients died; the case fatality proportion was similar in patients with a confirmed and unknown viral etiology (45.1 and 33.6% respectively). A requirement for assisted ventilation significantly increased mortality (HR 2.14 (95% CI 1.0-4.77)), while a high Glasgow coma score (HR 0.76 (95% CI 0.69-0.83)), and longer duration of hospitalization (HR 0.88 (95% CI 0.83-0.94)) were protective. CONCLUSION:This study is the first description of the etiology of adult-AES in India, and provides a framework for future surveillance programs in India.

journal_name

Clin Neurol Neurosurg

authors

Joshi R,Mishra PK,Joshi D,Santhosh SR,Parida MM,Desikan P,Gangane N,Kalantri SP,Reingold A,Colford JM Jr

doi

10.1016/j.clineuro.2013.04.008

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

1753-61

issue

9

eissn

0303-8467

issn

1872-6968

pii

S0303-8467(13)00132-7

journal_volume

115

pub_type

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