Screening for decreased glomerular filtration rate and associated risk factors in a cohort of HIV-infected patients in a middle-income country.

ABSTRACT

With the introduction of combined active antiretroviral therapy and the improved survival of HIV-infected patients, degenerative diseases and drug toxicity have emerged as long-term concerns. We studied the prevalence of decreased glomerular filtration rate (GFR) and associated risk factors in a cohort of HIV-infected patients from a middle-income country. Our cross-sectional study included all adult patients who attended an urban outpatient clinic in 2008. GFR was estimated using the CKD-EPI equation. The prevalence ratio (PR) of decreased GFR (defined as <60 mL/min/1.73 m(2)) was estimated using generalizing linear models assuming a Poisson distribution. We analyzed data from 1,970 patients, of which 82.9% had been exposed to ART. A total of 249 patients (12.6%) had a GFR between 60 and 89 mL/min/1.73 m(2), 3.1% had a GFR between 30 and 59, 0.3% had a GFR between 15 and 29, and 0.4% had a GFR <15. Decreased GFR was found in only 74 patients (3.8%). In the multivariate regression model, the factors that were independently associated with a GFR below 60 mL/min/1.73 m(2) were as follows age ≥ 50 years (PR = 3.4; 95% CI 1.7-6.8), diabetes (PR = 2.0; 95% CI 1.2-3.4), hypertension (PR = 2.0; 95% CI 1.3-3.2), current CD4+ cell count <350 cells/mm3 (PR = 2.1; 95% CI 1.3-3.3), past exposure to tenofovir (PR = 4.7; 95% CI 2.3-9.4) and past exposure to indinavir (PR =1.7; 95% CI 1.0-2.8). As in high-income countries, CKD was the predominant form of kidney involvement among HIV-infected individuals in our setting. The risk factors associated with decreased glomerular filtration were broad and included virus-related factors as well as degenerative and nephrotoxic factors. Despite the potential for nephrotoxicity associated with some antiretroviral drugs, in the short-term, advanced chronic renal disease remains very rare.