Outcome of Patients with Meningitis and Encephalitis at Tertiary Care Hospital in Eastern Nepal.

Background There are several etiologies of meningitis and encephalitis which must be considered in any patient presenting with fever, headache, neck stiffness and vomiting. Bacterial meningitis and viral encephalitis are medical emergencies and need urgent attention and treatment. Any delay in diagnosis and treatment has been shown to increase morbidity and mortality. Some of the survivors also have neurological sequel with a need for long term physical and occupational rehabilitation. Objective To find out common causes of meningitis, encephalitis, predictors of outcome, early and late complications of meningitis and encephalitis at Tertiary Care Hospital in Eastern Nepal. Method It is a prospective study which was conducted at Nobel Medical College Teaching Hospital from April 2015 to March 2016. Result A total of 52 patients participated in the study. Bacterial meningitis was the most common type of neuroinfection (40.4%) followed by tubercular meningitis (27%), viral encephalitis (17.3%) and viral meningitis (15.4%). Pneumococcus was the most common identified cause of meningitis accounting for 28.9% of bacterial meningitis. Japanese encephalitis was the most common identifiable cause of encephalitis accounting for 33% of cases. Low Glasgow Coma Scale at admission was significantly associated with worse neurological outcome (P<0.001). Similarly, high white blood cell count in blood was associated with worse neurological outcome (P=0.001). Conclusion Meningitis and encephalitis are neurological emergency. Prompt diagnosis and treatment is needed to improve survival. Neurological sequel is common after those infections which require long term rehabilitation.

Alzheimer's disease and infection: do infectious agents contribute to progression of Alzheimer's disease?

Infection with several important pathogens could constitute risk factors for cognitive impairment, dementia, and Alzheimer's disease (AD) in particular. This review summarizes the data related to infectious agents that appear to have a relationship with AD. Infections with herpes simplex virus type 1, picornavirus, Borna disease virus, Chlamydia pneumoniae, Helicobacter pylori, and spirochete were reported to contribute to the pathophysiology of AD or to cognitive changes. Based on these reports, it may be hypothesized that central nervous system or systemic infections may contribute to the pathogenesis or pathophysiology of AD, and chronic infection with several pathogens should be considered a risk factor for sporadic AD. If this hypothesis holds true, early intervention against infection may delay or even prevent the future development of AD.

Enterovirus 71, one virus and many stories.

Enterovirus 71 (EV71) has emerged as a significant cause of brainstem encephalitis and acute flaccid paralysis in Taiwan. It may be complicated by autonomic nervous system dysregulation and pulmonary edema (PE). Cytokines in the central nervous system and systemic inflammatory responses play important roles in the pathogenesis of EV71-associated PE. Pathogenesis-based management with intravenous immunoglobulin and milrinone has been associated with reduced mortality in children with severe EV71 infections.

Emergency department management of meningitis and encephalitis.

Bacterial meningitis and viral encephalitis are infectious disease emergencies that can cause significant patient morbidity and mortality. Clinicians use epidemiologic, historical, and physical examination findings to identify patients at risk for these infections, and central nervous system (CNS) imaging and lumbar puncture (LP) may be needed to further evaluate for these diagnoses. The diagnosis of bacterial meningitis can be challenging, as patients often lack some of the characteristic findings of this disease with presentations that overlap with more common disorders seen in the emergency department. This article addresses considerations in clinical evaluation, need for CNS imaging before LP, interpretation of cerebrospinal fluid results, standards for and effects of timely antibiotic administration, and recommendations for specific antimicrobial therapy and corticosteroids.

Canine distemper virus infection with secondary Bordetella bronchiseptica pneumonia in dogs

Canine distemper virus infection and secondary Bordetella bronchiseptica pneumonia are described in mongrel dogs. Canine distemper was characterised by nonsuppurative demyelinating encephalitis with typical inclusion bodies in astrocytes. B. bronchiseptica was isolated from areas of purulent bronchopneumonia.

Acute encephalopathy and intractable seizures in a 10-year-old boy.

We report a 10-year-old child with Robinow's syndrome who had a 2-week history of headaches and dizziness. On the day of admission, he developed a focal onset seizure with rapid secondary generalization. The seizures were intractable despite adequate doses of benzodiazepine, phenytoin, and phenobarbital, requiring a pentobarbital drip. Continuous electroencephalogram (EEG) monitoring showed persistence of the epileptiform discharges for 13 days. Cerebrospinal fluid and brain biopsy studies were unrevealing. Mycoplasma pneumonia titers showed elevation of both immunoglobulins G and M that doubled during the tenth hospital day. High-dose methylprednisolone was begun, and within 12 hours of initiation the patient sat up and began to follow commands appropriately. The overall EEG background markedly improved. Central nervous system Mycoplasma pneumoniae infection should be suspected in patients with an encephalopathy of unclear etiology.

Fatal encephalitis due to Nipah virus among pig-farmers in Malaysia.

BACKGROUND: Between February and April, 1999, an outbreak of viral encephalitis occurred among pig-farmers in Malaysia. We report findings for the first three patients who died. METHODS: Samples of tissue were taken at necropsy. Blood and cerebrospinal-fluid (CSF) samples taken before death were cultured for viruses, and tested for antibodies to viruses. FINDINGS: The three pig-farmers presented with fever, headache, and altered level of consciousness. Myoclonus was present in two patients. There were signs of brainstem dysfunction with hypertension and tachycardia. Rapid deterioration led to irreversible hypotension and death. A virus causing syncytial formation of vero cells was cultured from the CSF of two patients after 5 days; the virus stained positively with antibodies against Hendra virus by indirect immunofluorescence. IgM capture ELISA showed that all three patients had IgM antibodies in CSF against Hendra viral antigens. Necropsy showed widespread microinfarction in the central nervous system and other organs resulting from vasculitis-induced thrombosis. There was no clinical evidence of pulmonary involvement. Inclusion bodies likely to be of viral origin were noted in neurons near vasculitic blood vessels. INTERPRETATION: The causative agent was a previously undescribed paramyxovirus related to the Hendra virus. Close contact with infected pigs may be the source of the viral transmission. Clinically and epidemiologically the infection is distinct from infection by the Hendra virus. We propose that this Hendra-like virus was the cause of the outbreak of encephalitis in Malaysia.

Encefalitis Viral / Viral Encephalitis

Los virus se constituyen en una causa importante de encefalitis y meningoencefalitis en la edad pediátrica. Entre los implicados están el del sarampión, parotiditis, adenovirus, arbovirus, familia herpes virus, rabia, rubeola, entre otros. La encefalitis se ha definido como la inflamación del cerebro y las manifestaciones clínicas son diversas, siendo el resultado de la respuesta a este proceso inflamatorio, con hallazgos neurológicos específicos de acuerdo a las áreas del parénquima cerebral afectadas y que dependen del tipo de virus y de la respuesta inmune del individuo. El diagnóstico está basado en la historia clínica y el examen físico, complementado con estudios del líquido cefalorraquídeo, imagenología y cerología. El tratamiento es en general inespecífico, empírico y su objetivo es el de mantener la vida del paciente, prevenir y manejar las complicaciones. Se busca de este modo, llamar la atención sobre esta enfermedad, ya que el diagnóstico precoz y el tratamiento oportuno y adecuado, mejoran el pronóstico, disminuyen las secuelas y la mortalidad

Cognitive impairment after acute encephalitis: comparison of herpes simplex and other aetiologies.

OBJECTIVE: To compare the cognitive defects after acute acyclovir treated herpes simplex encephalitis with those after other types of acute encephalitis. METHODS: Seventy seven consecutive patients between 1985 and 1995 and 29 normal controls were studied. Of the 77 patients without concomitant neurological conditions, 17 had herpes simplex, one virus encephalitis (HSVE group), 27 had some other identified aetiology (non-HSVE group), and in 33 patients the cause was unknown. Acyclovir treatment was started less than four days after the first mental symptoms in 12 of 17 patients with HSVE. A thorough neuropsychological assessment was carried out about one month after the onset. RESULTS: The HSVE group had deficits in verbal memory, verbal-semantic functions, and visuoperceptual functions more often than the non-HSVE group. The risk for cognitive defects was twofold to four-fold in the patients with HSVE compared with the non-HSVE patients. Two (12%) of the patients with HSVE and 12 (44%) of the non-HSVE patients were cognitively intact. Six patients with HSVE (46%) and 17 (89%) non-HSVE patients later returned to work. The lesions on CT or MRI were bilateral only in one patient with HSVE. The defects in the three patients with adenovirus infection were severe and resembled the amnesia after HSVE. Cognitive impairment, not previously reported, was found in encephalitis after rotavirus infection and epidemic nephropathy. CONCLUSION: The recovery in the HSVE group was better than expected based on the medical literature. On the other hand there were surprisingly severe cognitive defects in encephalitis after other viruses. With early acyclovir treatment patients with the least severe HSVE were equivalent to those with non-HSV encephalitis with good outcome whereas those with the most severe non-HSV encephalitis were equivalent to those with HSVE with poor outcome.

[Gene amplification in viral CNS infections. Rapid diagnostic identification of herpesviruses]. / Genamplifiering vid virala CNS-infektioner. Snabb diagnostik av herpesgruppens virus.

DNA amplification with the polymerase chain reaction (PCR) technique was used as a diagnostic test on cerebrospinal fluid samples in cases where herpesvirus infection of the central nervous system (CNS) was suspected. During the period, 1992-93, 47 (8.9%) of 528 patients tested were positive for one or another of the following herpesviruses: herpes simplex virus type 1 (n = 16) or type 2 (n = 9), cytomegalovirus (n = 16), varicella-zoster virus (n = 4), or Epstein-Barr virus (n = 2). The study showed PCR to be a rapid and useful diagnostic method in clinical routine, enabling early antiviral intervention in several cases with an atypical clinical picture. Moreover, cytomegalovirus was found to be an important CNS pathogen in addition to herpes simplex virus, especially during childhood.

Specific deposition of passively transferred monoclonal antibodies against herpes simplex virus type 1 in rat brain infected with the virus.

The kinetics of human monoclonal antibody (anti-gB) to herpes simplex virus type 1 (HSV-1) were investigated after intravenous injection of anti-gB into an HSV-1 encephalitis animal model. Immunohistochemical study revealed specific deposition of passively transferred anti-gB in the hippocampus and thalamus of the infected rat brain, and it bound to the same neurons in which HSV-1 antigen was positively stained. To examine the macroscopic distribution of anti-gB in the infected brain, we undertook an 125I-labeled anti-gB injection study, and the same distribution of 125I-labeled anti-gB deposition was observed by brain semimicroautoradiography as in the immunohistochemical study. These results suggest that anti-gB easily permeates the capillary wall and is deposited in the inflammatory site where HSV-1-specific antigen is detectable. The use of radioisotope-labeled anti-gB injection and external brain imaging could lead to a noninvasive diagnostic tool for the early detection of HSV-1 antigen in cases of suspected HSV-1 encephalitis.

Cytomegalovirus encephalitis in two patients with AIDS receiving ganciclovir for cytomegalovirus retinitis.

Cytomegalovirus (CMV) encephalitis has been reported with increasing frequency in patients with AIDS. Nevertheless, the management of CMV-related encephalitis appears to be problematic and data in the literature on the clinical efficacy of ganciclovir therapy is sparse and controversial. We describe two patients with AIDS who developed CMV encephalitis while receiving ganciclovir maintenance therapy for CMV retinitis. Moreover, there was no improvement in neurological status or virological and radiological response during a further induction course of ganciclovir. These observations suggest that the currently recommended therapeutic protocols with ganciclovir are not effective in the prevention and treatment of CMV encephalitis in patients with AIDS.