title: Human herpesvirus 6 meningoencephalitis in allogeneic hematopoietic stem cell transplant recipients.
abstract: We retrospectively investigated the clinical characteristics of human herpesvirus 6 (HHV-6) meningoencephalitis within 100 days after allogeneic hematopoietic stem cell transplantation (HSCT). Of 1148 patients who received transplants between January 1999 and December 2003, 11 patients (0.96%) with HHV-6 meningoencephalitis were identified. Ten of 11 recipients received hematopoietic stem cells from donors other than HLA-identical siblings. Confusion was the most frequent central nervous system (CNS) symptom, and a skin rash with high-grade fever preceded the CNS symptoms in 9 patients. Magnetic resonance imaging of the brain showed an abnormal increased T2 signal in the hypothalamus of 5 patients. Eight patients were treated with ganciclovir, and an improvement of CNS symptoms was obtained in 3 patients; 3 patients treated with acyclovir showed no improvement. Improvement in the meningoencephalitis seemed less frequent in patients with abnormal findings in the hypothalamus than in those without such findings. Because the symptoms of HHV-6 meningoencephalitis mimicked those of cyclosporine- or tacrolimus-induced encephalopathy, the drugs were withdrawn at the onset of CNS symptoms in 10 patients, resulting in the development of grade IV graft-versus-host disease (GVHD) in 5 patients. Three patients died of HHV-6 meningoencephalitis, and 6 died of other causes, including GVHD. In conclusion, HHV-6 meningoencephalitis is a rare but potentially life-threatening complication in patients who undergo allogeneic HSCT. Careful assessment of the clinical findings and the brain may allow early and precise diagnosis of HHV-6 meningoencephalitis and contribute to improving its prognosis.
authors.affiliation: Department of Internal Medicine and Clinical Immunology, Yokohama City University, Graduate School of Medicine, Yokohama, Japan. kfujimaki@cancer.livedoor.com
authors.forename: Katsumichi
authors.initials: K
authors.lastname: Fujimaki
authors.forename: Takehiko
authors.initials: T
authors.lastname: Mori
authors.forename: Aiko
authors.initials: A
authors.lastname: Kida
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Tanaka
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Kawai
authors.forename: Takafumi
authors.initials: T
authors.lastname: Matsushima
authors.forename: Kenji
authors.initials: K
authors.lastname: Kishi
authors.forename: Shin
authors.initials: S
authors.lastname: Fujisawa
authors.forename: Tohru
authors.initials: T
authors.lastname: Sakura
authors.forename: Akira
authors.initials: A
authors.lastname: Yokota
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Kanda
authors.forename: Jun
authors.initials: J
authors.lastname: Taguchi
authors.forename: Hideki
authors.initials: H
authors.lastname: Akiyama
authors.forename: Heiwa
authors.initials: H
authors.lastname: Kanamori
authors.forename: Atsuo
authors.initials: A
authors.lastname: Maruta
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Okamoto
authors.forename: Hisashi
authors.initials: H
authors.lastname: Sakamaki
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000008:administration & dosage; D002648:Child; D005260:Female; D015774:Ganciclovir / Q000008:administration & dosage; D006086:Graft vs Host Disease / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000209:etiology / Q000401:mortality; D019337:Hematologic Neoplasms / Q000000981:diagnostic imaging / Q000401:mortality / Q000628:therapy; D018380:Hematopoietic Stem Cell Transplantation / Q000009:adverse effects; D015654:Herpesvirus 6, Human; D006801:Humans; D007031:Hypothalamus / Q000000981:diagnostic imaging / Q000821:virology; D008279:Magnetic Resonance Imaging; D008297:Male; D008590:Meningoencephalitis / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000401:mortality / Q000821:virology; D008875:Middle Aged; D011379:Prognosis; D011859:Radiography; D012189:Retrospective Studies; D019349:Roseolovirus Infections / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000209:etiology / Q000401:mortality; D014184:Transplantation, Homologous
chemical_list: D000998:Antiviral Agents; D015774:Ganciclovir