Browsing by Author "Wester CW"

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Early immunologic response and subsequent survival among malnourished adults receiving antiretroviral therapy in Urban Zambia.
(2010-Aug-24) Koethe JR; Limbada MI; Giganti MJ; Nyirenda CK; Mulenga L; Wester CW; Chi BH; Stringer JS; Centre for Infectious Disease Research in Zambia, Lusaka, Zambia. john.r.koethe@vanderbilt.edu; CIDRZ; Centre for Infectious Disease Research in Zambia (CIDRZ)
OBJECTIVE: To evaluate the relationship between early CD4(+) lymphocyte recovery on antiretroviral therapy (ART) and subsequent survival among low body mass index (BMI) HIV-1-infected adults. DESIGN: Retrospective analysis of a large programmatic cohort in Lusaka, Zambia. METHODS: We evaluated ART-treated adults enrolled in care for more than 6 months. We stratified this study population according to World Health Organization (WHO) malnutrition criteria: normal (BMI >or=18.5 kg/m(2)), mild (17.00-18.49), moderate (16.00-16.99), and severe (<16.0). We used Cox proportional hazards regression to estimate the subsequent risk of death associated with absolute CD4(+) cell count change over the first 6 months on ART. To account for effect modification associated with baseline CD4(+) cell count, a weighted summary measure was calculated. RESULTS: From May 2004 to February 2009, 56,612 patients initiated ART at Lusaka district clinics; of these, 33 097 (58%) were included in this analysis. The median change in 0-6 month CD4(+) cell count in each baseline BMI strata varied from 127 to 131 cells/microl. There was a statistically significant, inverse association between baseline BMI and the post 6-month hazard for mortality only among those patients with less than 100 cells/microl increase in the first 6 months of ART. A CD4(+) cell count increase of at least 100 cells/microl over the first 6 months of ART was not associated with a higher hazard for mortality, regardless of baseline BMI. CONCLUSIONS: Low baseline BMI and attenuated CD4(+) cell count response at 6 months had a compounding, negative impact on post 6-month survival. Specific guidelines for monitoring ART response using immunologic criteria may be warranted for low BMI patients.
Global HIV prevention, care and treatment services for children: a cross-sectional survey from the International Epidemiology Databases to Evaluate AIDS (IeDEA) consortium.
(2023-Mar-13) Vreeman RC; Yiannoutsos CT; Yusoff NKN; Wester CW; Edmonds A; Ofner S; Davies MA; Leroy V; Lumbiganon P; de Menezes Succi RC; Twizere C; Brown S; Bolton-Moore C; Takassi OE; Scanlon M; Martin R; Wools-Kaloustian K; Center for Epidemiology and Research in POPulation Health (CERPOP), Inserm, Université de Toulouse, Université Paul Sabatier, Toulouse, France.; Department of Global Health and Health System Design, Icahn School of Medicine at Mount Sinai Arnhold Institute for Global Health, New York, New York, USA rachel.vreeman@mssm.edu.; Department of Epidemiology, The University of North Carolina at Chapel Hill Gillings School of Global Public Health, Chapel Hill, North Carolina, USA.; Centre for Infectious Disease Epidemiology and Research, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.; Department of Biostatistics and Health Data Science, Indiana University Richard M Fairbanks School of Public Health, Indianapolis, Indiana, USA.; Center for Infectious Disease Research in Zambia, Lusaka, Zambia.; Department of Medicine, The University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA.; Vanderbilt Institute for Global Health, Nashville, Tennessee, USA.; Department of Pediatrics, Universidade Federal de São Paulo, Sao Paulo, Brazil.; Département de Pédiatrie, Université de Lomé, Lomé, Togo.; Indiana University Center for Global Health, Indianapolis, Indiana, USA.; Centre National de Référence en Matière de VIH/SIDA, Bujumbura, Burundi.; Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA.; Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.; Department of Paediatrics, Hospital Raja Perempuan Zainab II, Kota Bharu, Malaysia.; Department of Global Health and Health System Design, Icahn School of Medicine at Mount Sinai Arnhold Institute for Global Health, New York, New York, USA.; Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.; CIDRZ; Centre for Infectious Disease Research in Zambia (CIDRZ)
OBJECTIVES: To assess access children with HIV have to comprehensive HIV care services, to longitudinally evaluate the implementation and scale-up of services, and to use site services and clinical cohort data to explore whether access to these services influences retention in care. METHODS: A cross-sectional standardised survey was completed in 2014-2015 by sites providing paediatric HIV care across regions of the International Epidemiology Databases to Evaluate AIDS (IeDEA) consortium. We developed a comprehensiveness score based on the WHO's nine categories of essential services to categorise sites as 'low' (0-5), 'medium', (6-7) or 'high' (8-9). When available, comprehensiveness scores were compared with scores from a 2009 survey. We used patient-level data with site services to investigate the relationship between the comprehensiveness of services and retention. RESULTS: Survey data from 174 IeDEA sites in 32 countries were analysed. Of the WHO essential services, sites were most likely to offer antiretroviral therapy (ART) provision and counselling (n=173; 99%), co-trimoxazole prophylaxis (168; 97%), prevention of perinatal transmission services (167; 96%), outreach for patient engagement and follow-up (166; 95%), CD4 cell count testing (126; 88%), tuberculosis screening (151; 87%) and select immunisation services (126; 72%). Sites were less likely to offer nutrition/food support (97; 56%), viral load testing (99; 69%) and HIV counselling and testing (69; 40%). 10% of sites rated 'low', 59% 'medium' and 31% 'high' in the comprehensiveness score. The mean comprehensiveness of services score increased significantly from 5.6 in 2009 to 7.3 in 2014 (p<0.001; n=30). Patient-level analysis of lost to follow-up after ART initiation estimated the hazard was highest in sites rated 'low' and lowest in sites rated 'high'. CONCLUSION: This global assessment suggests the potential care impact of scaling-up and sustaining comprehensive paediatric HIV services. Meeting recommendations for comprehensive HIV services should remain a global priority.
Nutrition and inflammation serum biomarkers are associated with 12-week mortality among malnourished adults initiating antiretroviral therapy in Zambia.
(2011-Apr-10) Koethe JR; Blevins M; Nyirenda C; Kabagambe EK; Shepherd BE; Wester CW; Zulu I; Chiasera JM; Mulenga LB; Mwango A; Heimburger DC; Centre for Infectious Diseases Research in Zambia, Plot 1275 Lubuto Road, Lusaka, Zambia. john.r.koethe@vanderbilt.edu; CIDRZ; Centre for Infectious Disease Research in Zambia (CIDRZ)
BACKGROUND: A low body mass index (BMI) at antiretroviral therapy (ART) initiation is a strong predictor of mortality among HIV-infected adults in resource-constrained settings. The relationship between nutrition and inflammation-related serum biomarkers and early treatment outcomes (e.g., less than 90 days) in this population is not well described. METHODS: An observational cohort of 142 HIV-infected adults in Lusaka, Zambia, with BMI under 16 kg/m2 or CD4+ lymphocyte counts of less than 50 cells/mm3, or both, was followed prospectively during the first 12 weeks of ART. Baseline and serial post-treatment phosphate, albumin, ferritin and highly sensitive C-reactive protein (hsCRP) serum levels were measured. The primary outcome was mortality. RESULTS: Lower baseline phosphate and albumin serum levels, and higher ferritin and hsCRP, were significantly associated with mortality prior to 12 weeks (p<0.05 for all comparisons), independent of known risk factors for early ART-associated mortality in sub-Saharan Africa. The time-dependent interval change in albumin was associated with mortality after adjusting for the baseline value (AHR 0.62 [0.43, 0.89] per 5 g/L increase), but changes in the other biomarkers were not. CONCLUSIONS: The predictive value of serum biomarkers for early mortality in a cohort of adults with malnutrition and advanced HIV in a resource-constrained setting was primarily driven by pre-treatment values, rather than post-ART changes. Interventions to promote earlier HIV diagnosis and treatment, address nutritional deficiencies, and identify the etiologies of increased systemic inflammation may improve ART outcomes in this vulnerable population.