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  • Title: [Japanese guidelines for the management of herpes simplex encephalitis; comparison with those from the International Management Herpes Forum].
    Author: Shoji H.
    Journal: Rinsho Shinkeigaku; 2006 Nov; 46(11):955-7. PubMed ID: 17432231.
    Abstract:
    Herpes simplex encephalitis (HSE) is still recognized as a severe sporadic encephalitis, although the mortality and morbidity rates have been decreased to 10% and 30%, respectively. This disease is diagnosed using clinical symptoms, CSF, EEG, CT, MRI, and virologic tests such as polymerase chain reaction (PCR) or enzyme immunosorbent assay (EIA). Early diagnosis and treatment are essential for HSE. However, the early symptoms of this disease are various, and the laboratory diagnostic criteria are unclear to the non-specialist. In 2005, Japanese guidelines for the management of HSE have been issued via two sets of Workshops at the Japanese Neuroinfectious Disease Congress. The diagnostic and therapeutic criteria were discussed in comparison with those from the International Management Herpes Forum (IMHF) in 2004. For a definitive diagnosis, CSF PCR for herpes simplex virus (HSV) is recommended, and the detection rate has been reported to be 60 to 80% within the 7th day of the illness. In the IMHF, the PCR method has also been the primary method for early diagnosis and for monitoring the therapy. Further, quantitative real-time PCR has become available for measuring the effectiveness of aciclovir therapy. To measure HSV antibody levels, complement antibody (CF), neutralizing antibody (NT), or enzyme-linked immunosorbent assay (ELISA or EIA) are available. Significant elevation of EIA IgG or intrathecal HSV antibody production should be shown, although these antibody responses often appear two weeks after the onset of HSE. Regarding anti-herpesvirus drugs, in both Japanese and IMHF guidelines aciclovir is consistent with the first choice, and it is recommended that its administration would be started as soon as HSE is suspected on the basis of clinical pictures, CT * MRI, EEG, or CSF findings. However, antiviral therapy may be discontinued if a negative CSF HSV PCR is obtained at > 72 hours after onset. A recent Japanese study shows the efficacy of a combination therapy of aciclovir and corticosteroid for this disease. Further prospective investigation is expected.
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