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1996-02-26
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Document 0013
DOCN M9620013
TI Delayed latency of the event-related brain potential P3A component in
HIV disease. Progressive effects with increasing cognitive impairment.
DT 9602
AU Fein G; Biggins CA; MacKay S; Department of Psychiatry, University of
California-San Francisco,; USA.
SO Arch Neurol. 1995 Nov;52(11):1109-18. Unique Identifier : AIDSLINE
MED/96057018
AB OBJECTIVE: To examine the degree to which P3A latency was sensitive to
the early and progressive effects of human immunodeficiency virus (HIV)
disease on frontal cortex function by studying HIV-positive subjects who
varied in degree of cognitive impairment. DESIGN: Event-related brain
potential studies of four groups of subjects: cognitively nonimpaired
high-risk HIV-negative subjects, cognitively nonimpaired HIV-positive
subjects, cognitively mildly to moderately impaired HIV-positive
subjects, and cognitively severely impaired HIV-positive subjects.
SETTING: Voluntarily participating subjects on an outpatient basis at a
medical center facility. PARTICIPANTS: Seventy-one community-residing
gay or bisexual HIV-positive male volunteers were compared with 17
HIV-negative male gay or bisexual subjects used as a control sample. The
HIV-positive subjects were stratified with regard to severity of
cognitive impairment into the following three subsamples: subjects who
were cognitively normal (n = 35), subjects with mild to moderate
cognitive impairment (n = 20), and subjects with severe cognitive
impairment (n = 16), with the samples closely matched in age. The
HIV-positive subsamples were closely matched on percentage of CD4
lymphocytes. Subjects were excluded if they reported a history of drug
or alcohol abuse, a major mental disorder, a head injury with loss of
consciousness, or brain disease other than HIV related. MAIN OUTCOME
MEASURE: P3A latency. RESULTS: P3A latency was significantly delayed in
HIV-positive subjects compared with HIV-negative control subjects, with
a delay of 12 milliseconds in the cognitively normal group (P < .02) and
the magnitude of delay increasing with increasing severity of
HIV-associated cognitive impairments (P < .001). Delayed P3A was
primarily associated with the progression of HIV-associated cognitive
impairment, with a secondary and additive association with severity of
HIV-associated medical illness. CONCLUSION: This finding suggests that
delayed P3A latency is sensitive to the relatively early central nervous
system effects of HIV and progresses with worsening of the central
nervous system effects of HIV.
DE Adult Auditory Perception Brain
Diseases/ETIOLOGY/*PHYSIOPATHOLOGY/PSYCHOLOGY Brain Mapping Cognition
Disorders/*ETIOLOGY/PHYSIOPATHOLOGY *Evoked Potentials Human HIV
Infections/COMPLICATIONS/*PHYSIOPATHOLOGY/PSYCHOLOGY Male Middle Age
Neuropsychological Tests Psychomotor Performance Reaction Time
Support, U.S. Gov't, Non-P.H.S. Support, U.S. Gov't, P.H.S. Visual
Perception JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).