Dataset Information

Validation of a Novel Multivariate Method of Defining HIV-Associated Cognitive Impairment.

ABSTRACT:

Background

The optimum method of defining cognitive impairment in virally suppressed people living with HIV is unknown. We evaluated the relationships between cognitive impairment, including using a novel multivariate method (NMM), patient- reported outcome measures (PROMs), and neuroimaging markers of brain structure across 3 cohorts.

Methods

Differences in the prevalence of cognitive impairment, PROMs, and neuroimaging data from the COBRA, CHARTER, and POPPY cohorts (total n = 908) were determined between HIV-positive participants with and without cognitive impairment defined using the HIV-associated neurocognitive disorders (HAND), global deficit score (GDS), and NMM criteria.

Results

The prevalence of cognitive impairment varied by up to 27% between methods used to define impairment (eg, 48% for HAND vs 21% for NMM in the CHARTER study). Associations between objective cognitive impairment and subjective cognitive complaints generally were weak. Physical and mental health summary scores (SF-36) were lowest for NMM-defined impairment ( P < .05).There were no differences in brain volumes or cortical thickness between participants with and without cognitive impairment defined using the HAND and GDS measures. In contrast, those identified with cognitive impairment by the NMM had reduced mean cortical thickness in both hemispheres ( P < .05), as well as smaller brain volumes ( P < .01). The associations with measures of white matter microstructure and brain-predicted age generally were weaker.

Conclusion

Different methods of defining cognitive impairment identify different people with varying symptomatology and measures of brain injury. Overall, NMM-defined impairment was associated with most neuroimaging abnormalities and poorer self-reported health status. This may be due to the statistical advantage of using a multivariate approach.

SUBMITTER: Underwood J

PROVIDER: S-EPMC6590980 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Publications

Validation of a Novel Multivariate Method of Defining HIV-Associated Cognitive Impairment.

Underwood Jonathan J De Francesco Davide D Cole James H JH Caan Matthan W A MWA van Zoest Rosan A RA Schmand Ben A BA Sharp David J DJ Sabin Caroline A CA Reiss Peter P Winston Alan A

Open forum infectious diseases 20190503 6

<h4>Background</h4>The optimum method of defining cognitive impairment in virally suppressed people living with HIV is unknown. We evaluated the relationships between cognitive impairment, including using a novel multivariate method (NMM), patient- reported outcome measures (PROMs), and neuroimaging markers of brain structure across 3 cohorts.<h4>Methods</h4>Differences in the prevalence of cognitive impairment, PROMs, and neuroimaging data from the COBRA, CHARTER, and POPPY cohorts (total n = 9 ...[more]

PMID: 31263729

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Project description:ObjectiveTo assess the effectiveness of the selegiline transdermal system (STS) in reversing HIV-induced metabolic brain injury (as measured by proton magnetic resonance spectroscopy [MRS]) and in decreasing oxidative stress, measured by CSF protein carbonyl concentration.MethodsSixty-two subjects with HIV-associated cognitive impairment were coenrolled in a 24-week placebo-controlled study (AIDS Clinical Trial Group protocol A5090) and were randomly assigned to receive STS 3 mg/24 h, STS 6 mg/24 h, or matching placebo. Cognitive performance was evaluated using the neuropsychological z score (NPZ)-8 and NPZ-6, as well as cognitive domain scores. Subjects underwent proton MRS at study entry and weeks 12 and 24. CSF protein carbonyl was measured at baseline and week 24.ResultsA slight increase in N-acetyl aspartate/creatine from baseline to week 24 was found in the basal ganglia (p = 0.023) and centrum semiovale (p = 0.072) of the placebo group compared with the STS groups; however, there were no significant changes when the absolute metabolite concentrations were analyzed. The levels of choline/creatine in the midfrontal cortex were also significantly higher during the week 12 visit in the combined STS groups. This persisted to the week 24 visit (p = 0.002). Evaluation of the change in NPZ-8, NPZ-6, and cognitive domain scores from baseline to weeks 12 and 24 revealed no significant differences between treatment arms. Protein carbonyl analysis revealed no significant changes among the groups.ConclusionIn this 24-week study, the selegiline transdermal system (STS) had no effect on either magnetic resonance spectroscopy (MRS) metabolites or oxidative stress, as measured by CSF protein carbonyl concentration. The lack of effect on these biomarkers is also reflected in the lack of cognitive improvement in the STS groups compared to placebo.Level of evidenceThis study provides Class II evidence that STS had no effect on either MRS metabolites or oxidative stress, as measured by CSF protein carbonyl concentration over a period of 24 weeks.

Project description:ObjectiveTo assess the efficacy and safety of transdermal rivastigmine for the treatment of HIV-associated cognitive impairment.MethodsWe recruited HIV-infected patients with cognitive impairment on stable antiretroviral therapy in a randomized controlled pilot trial with a 48-week follow-up. An additional assessment was held at 12 weeks. Participants received transdermal rivastigmine (9.5 mg daily), lithium (400 mg twice daily, titrated progressively), or remained in a control group (no new medication). The primary efficacy endpoint was change in a global cognitive score (NPZ-7). Secondary endpoints included change in specific cognitive measures, domains, and functional parameters. Safety covered the frequency of adverse events and changes in laboratory results.ResultsSeventy-six subjects were screened, and 29 were finally enrolled. Better cognitive outcomes were observed in all groups, although there were no significant differences between the arms (mean NPZ-7 change [SD]): rivastigmine, 0.35 (0.14); lithium, 0.25 (0.40); control, 0.20 (0.44) (p = 0.78). The rivastigmine group showed the highest positive trend (mean NPZ-7 [SD], baseline vs week 48): rivastigmine, -0.47 (0.22) vs -0.11 (0.29), p = 0.06; lithium, -0.50 (0.40) vs -0.26 (0.21), p = 0.22; control, -0.52 (0.34) vs -0.32 (0.52), p = 0.44. The cognitive domains with the highest positive trends were information processing speed at week 12 and executive function at week 48 (rivastigmine vs control): information processing speed, 0.35 (0.64) vs -0.13 (0.25), p = 0.17, d = 0.96; and executive functioning, 0.73 (0.33) vs 0.03 (0.74), p = 0.09, d = 1.18. No relevant changes were observed regarding functional outcomes. A total of 12 (41%) individuals dropped out of the study: 2 (20%) were due to medication-related effects in the rivastigmine group and 4 (36%) in the lithium group. No severe adverse events were reported.ConclusionsThe results from this small randomized trial indicate that transdermal rivastigmine did not provide significant cognitive benefits in people with HAND on stable antiretroviral therapy, even though positive trends were found in specific cognitive domains. Relevant tolerability issues were not observed.

Project description:IntroductionThe aim of our study was to investigate the potential relationship between liver fibrosis (LF) and cognitive performance in HIV+ patients.Materials and methodsWe performed a cross-sectional cohort study by consecutively enrolling HIV+ patients during routine outpatient visits at two clinical centres in Italy. Subjects with decompensated liver disease were excluded. All subjects underwent a comprehensive neuropsychological battery exploring memory, attention, psychomotor speed and language; cognitive impairment was defined as at least two abnormal [1.5 SD below the mean for appropriate norms] cognitive domains. LF was explored by calculating FIB4 index; in a subgroup of patients, LF was also assessed by transient elastography. Factors associated with cognitive impairment were investigated by logistic regression models.ResultsA total of 413 patients [77% males, median age 46 (IQR 39-52), 17% with past AIDS-defining events, 19% past IDU, 3% with diabetes, 94% on cART, 90% with HIV RNA <50 copies/mL, 18% co-infected with HCV] were enrolled. Seventeen patients (4%) had FIB4 >3.25 and 14/129 (3%) had liver stiffness >14KPa. Forty-seven patients (11%) were diagnosed with cognitive impairment. At multivariate analyses patients with FIB4 >1.45 showed a higher risk of cognitive impairment in comparison with those with lower values (OR 2.19, 95% CI 1.02-4.72; p=0.044) after adjusting for education (OR 0.79, 95% CI 0.71-0.88; p<0.001), past IDU (OR 1.69, 95% CI 0.67-4.23; p=0.264), diabetes (OR 2.35, 95% CI 0.62-8.86; p=0.207), HIV RNA <50 copies/mL (OR 0.47, 95% CI 0.19-1.14; p=0.095) and HCV co-infection (OR 0.88, 95% CI 0.33-2.39; p=0.807). Analyzing any single cognitive domain, a higher risk of abnormal psychomotor speed was associated with fibroscan score >14KPa in comparison with fibroscan score <7KPa (OR 285.07; 95% CI 2.42-33574.06; p=0.020) after adjusting for education (OR 0.54, 95% CI 0.31-0.92; p=0.024), age (for 10 years increase) (OR 2.03, 95% CI 0.55-7.53; p=0.288), past IDU (OR 4.43, 95% CI 0.35-7.57; p=0.526), HIV RNA <50 copies/mL (OR 0.01, 95% CI 0.00-0.18; p=0.003), HIV history (for 1 year increase) (OR 0.96, 95% CI 0.83-1.12; p=0.641), CD4 cells count at nadir (OR 1.10, 95% CI 0.56-2.16; p=0.779), and HCV co-infection (OR 0.06; 95% CI 0.00-1.93; p=0.113).ConclusionsIn HIV-infected patients higher LF, estimated through non-invasive methods, is associated to a higher risk of cognitive impairment.

Dataset Information

Validation of a Novel Multivariate Method of Defining HIV-Associated Cognitive Impairment.

Background

Methods

Results

Conclusion

Publications

Validation of a Novel Multivariate Method of Defining HIV-Associated Cognitive Impairment.

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