title: Cerebral magnetic resonance relaxometry in HIV infection.
abstract: A prospective, cross-sectional study was designed to determine the magnetic resonance relaxation times of cerebral white matter in human immunodeficiency virus (HIV) infected individuals. T1 and T2 were estimated at 1.5 T using four-point methods. Seventy-five HIV-1 seropositive subjects, 48 seronegative blood donors, and 17 seronegative homosexual men were studied. Associations between relaxometry and clinical classification, neurological status, immunological status, and qualitative MRI were investigated. Statistically significant differences in white matter T1 relaxation time were found comparing low-risk control and AIDS groups (p < .005), seropositive subjects with neurological signs and those without (p < .005), and subjects with low (CD4 < or = 200 x 10(6)/l) and high (CD4 > 200 x 10(6)/1) CD4 cell counts (p < .05). These findings add to the body of information that reveals no HIV-related change in the brain before the onset of symptomatic immunosuppression and go someway to validating the previous visually rated, qualitative findings. Statistically significant difference in white matter T2 relaxation time were also found comparing the two control groups (p < .005) highlighting the need for appropriate controls.
authors.affiliation: Department of Medical Physics and Bioengineering, Middlesex Hospital, University College London Hospitals Trust, UK.
authors.forename: I D
authors.initials: ID
authors.lastname: Wilkinson
authors.forename: M N
authors.initials: MN
authors.lastname: Paley
authors.forename: M A
authors.initials: MA
authors.lastname: Hall-Craggs
authors.forename: R J
authors.initials: RJ
authors.lastname: Chinn
authors.forename: W K
authors.initials: WK
authors.lastname: Chong
authors.forename: B J
authors.initials: BJ
authors.lastname: Sweeney
authors.forename: B E
authors.initials: BE
authors.lastname: Kendall
authors.forename: R F
authors.initials: RF
authors.lastname: Miller
authors.forename: S P
authors.initials: SP
authors.lastname: Newman
authors.forename: M J
authors.initials: MJ
authors.lastname: Harrison
mesh_terms: D015526:AIDS Dementia Complex / Q000175:diagnosis; D017088:AIDS-Related Opportunistic Infections / Q000175:diagnosis; D000328:Adult; D001782:Blood Donors; D001921:Brain / Q000473:pathology*; D001927:Brain Diseases / Q000150:complications / Q000175:diagnosis; D018791:CD4 Lymphocyte Count; D003430:Cross-Sectional Studies; D005260:Female; D015658:HIV Infections / Q000276:immunology / Q000473:pathology*; D018023:HIV Seronegativity; D006679:HIV Seropositivity / Q000473:pathology; D015497:HIV-1; D018451:Homosexuality, Male; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D011446:Prospective Studies; D012307:Risk Factors