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Infectious Disorders - Drug Targets

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ISSN (Print): 1871-5265
ISSN (Online): 2212-3989

Research Article

Renal Phosphate Handling in Antiretroviral-naive HIV-Infected Patients

Author(s): Tewogbade Adeoye Adedeji*, Simeon Adelani Adebisi, Nife Olamide Adedeji, Olusola Akanni Jeje and Rotimi Samuel Owolabi

Volume 21, Issue 2, 2021

Published on: 07 July, 2020

Page: [202 - 210] Pages: 9

DOI: 10.2174/1871526520666200707115259

Price: $65

Abstract

Background: Human immunodeficiency virus (HIV) infection impairs renal function, thereby affecting renal phosphate metabolism.

Objectives: We prospectively estimated the prevalence of phosphate abnormalities (mild, moderate to life-threatening hypophosphataemia, and hyperphosphataemia) before initiating antiretroviral therapy (ART).

Methods: A cross-sectional analysis was performed on 170 consecutive newly diagnosed ARTnaive, HIV-infected patients attending our HIV/AIDS clinics over a period of one year. Fifty (50) screened HIV-negative blood donors were used for comparison (controls). Blood and urine were collected simultaneously for phosphate and creatinine assay to estimate fractional phosphate excretion (FEPi %) and glomerular filtration rate (eGFR).

Results: eGFR showed significant difference between patients’ and controls’ medians (47.89ml/ min/1.73m2 versus 60ml/min/1.73m2, p <0.001); which denotes a moderate chronic kidney disease in the patients. Of the 170 patients, 78 (45.9%) had normal plasma phosphate (0.6-1.4 mmol/L); 85 (50%) had hyperphosphataemia. Grades 1, 2 and 3 hypophosphataemia was observed in 3 (1.8%), 3 (1.8%), and 1(0.5%) patient(s) respectively. None had grade 4 hypophosphataemia. Overall, the patients had significantly higher median of plasma phosphate than the controls, 1.4 mmol/L (IQR: 1.0 – 2.2) versus 1.1 mmol/L (IQR: 0.3 – 1.6), p <0.001, implying hyperphosphataemia in the patients; significantly lower median urine phosphate than the controls, 1.5 mmol/L (IQR: 0.7 -2.1) versus 8.4 mmol/L (IQR: 3.4 – 16), p <0.001), justifying the hyperphosphataemia is from phosphate retention; but a non-significantly lower median FEPi% than the controls, 0.96% (IQR: 0.3 -2.2) versus 1.4% (IQR: 1.2 -1.6), p > 0.05. Predictors of FEPi% were age (Odds ratio, OR 0.9, p = 0.009); weight (OR 2.0, p < 0.001); CD4+ cells count predicted urine phosphate among males (p = 0.029).

Conclusion: HIV infection likely induces renal insufficiency with reduced renal phosphate clearance. Thus, hyperphosphataemia is highly prevalent, and there is mild to moderate hypophosphataemia but its life-threatening form (grade 4) is rare among ART-naive HIV patients.

Keywords: Antiretroviral, human Immunodeficiency Virus, hyperphosphataemia, hypophosphataemia, renal handling of phosphate, eGFR.

Graphical Abstract
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