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Response to a Dolutegravir-based Regimen in an HIV-Infected Woman with Multiple Comorbidities and a Highly Resistant Strain
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Amedeo Capetti, Laura Carenzi, Noemi Astuti , Valeria Cozzi, Valeria Micheli, Maria Vittoria Cossu
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American Journal of Medical Case Reports. 2015 3 (7). doi: 10.12691/ajmcr-3-7-5
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Keywords: HIV, PAH, dolutegravir, sildenafil, ambrisentan, resistance
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Context: HIV-infected patients have a higher burden of comorbidities than the general population and drug-drug interactions limit the choice of antiretroviral compounds, also limiting the possibility of drug sequencing in case of toxicity or failure. In our patient, affected by HIV-related pulmonary hypertension (HIV-PAH), the use of sildenafil and ambrisentan excluded the possibility of using two of the main classes of antiretrovirals, protease inhibitors (PIs) and non-nucleoside reverse transcriptase inhibitors (NNRTIs). Having failed a combination regimen based on raltegravir, while awaiting the results of genotypic testing for drug resistance she was switched to dolutegravir, a brand new integrase strand transfer inhibitor (INSTI) with high genetic barrier, and in one month her HIV-1 viremia dramatically dropped to undetectable levels. The genotypic test revealed resistance to all the drugs she was taking including dolutegravir. The backbone was changed to a dual regimen including rilpivirine and viral suppression was maintained at three months. Unprecedented pharmacokinetic data are provided for the two antiviral drugs in combination with sildenafil and ambrisentan.
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