Evaluation of Viral Load Thresholds for Predicting New World Health Organization Stage 3 and 4 Events in HIV-Infected Children Receiving Highly Active Antiretroviral Therapy

• Autor(a) principal: Siberry, George K.
• Data de Publicação: 2012
• Outros Autores: Harris, D. Robert, Oliveira, Ricardo Hugo, Krauss, Margot R., Hofer, Cristina B., Tiraboschi, Adriana Aparecida, Marques, Heloisa, Succi, Regina C. [UNIFESP], Abreu, Thalita, Della Negra, Marinella, Mofenson, Lynne M., Hazra, Rohan, NISDI PLACES Protocol
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: http://dx.doi.org/10.1097/QAI.0b013e31824e4da6; http://repositorio.unifesp.br/handle/11600/34915
• topic: pediatric HIV infection; viral load monitoring; viral load threshold; Latin America

Background: This study evaluated a wide range of viral load (VL) thresholds to identify a cut-point that best predicts new clinical events in children on stable highly active antiretroviral therapy (HAART).Methods: Cox proportional hazards modeling was used to assess the adjusted risk for World Health Organization stage 3 or 4 clinical events (WHO events) as a function of time-varying CD4, VL, and hemoglobin values in a cohort study of Latin American children on HAART >= 6 months. Models were fit using different VL cut-points between 400 and 50,000 copies per milliliter, with model fit evaluated on the basis of the minimum Akaike information criterion value, a standard model fit statistic.Results: Models were based on 67 subjects with WHO events out of 550 subjects on study. the VL cut-points of >2600 and >32,000 copies per milliliter corresponded to the lowest Akaike information criterion values and were associated with the highest hazard ratios (2.0, P = 0.015; and 2.1, P = 0.0058, respectively) for WHO events.Conclusions: in HIV-infected Latin American children on stable HAART, 2 distinct VL thresholds (>2600 and >32,000 copies/mL) were identified for predicting children at significantly increased risk for HIV-related clinical illness, after accounting for CD4 level, hemoglobin level, and other significant factors.