Abstract
Objective/BackgroundIndividuals with sickle cell anaemia (SCA) may manifest various forms of renal abnormalities. Proteinuria is an early marker of renal dysfunction and a strong risk factor for chronic kidney disease (CKD) progression in both patients with SCA and non-SCA population. Currently, the degree of attention given to proteinuric CKD far exceeds that of nonproteinuric CKD, and risk factors that might trigger a progressive decline of the glomerular filtration rate (GFR) in the absence of proteinuria have not been well evaluated in SCA. The aim of this study was to compare the clinical and laboratory parameters among SCA patients with proteinuric and nonproteinuric CKD. MethodsThis was a cross-sectional study conducted at the University of Maiduguri Teaching Hospital in north-eastern Nigeria between January 2013 and April 2018. Clinical variables including age of diagnosis of SCA, frequency of vaso-occlusive crises, number of hospitalizations per annum and transfusion therapy were collected. Laboratory data including haematological profile and renal function test were obtained from routine blood sampling. ResultsA total of 257 patients with SCA (HbSS) were enrolled during the study period of which 42 had proteinuric CKD, and 48 had nonproteinuric CKD. The two groups were matched for the number of hospital admission (p = .063) and blood transfusion per year (p = .450), frequency of painful crisis (p = .210), systolic blood pressure (p = .084) and diastolic blood pressure (p = .400). In the proteinuric CKD group, the mean serum creatinine was higher (332.17 µmol/L, p = .001) and the estimated GFR was lower (31.88 mL/min, p = .046). The serum alkaline phosphatase was higher in the nonproteinuric CKD group (81.81 IU/L, p = .012). ConclusionNonproteinuric CKD was more frequent than proteinuric CKD in our study population; however, the proteinuric group presented with more advanced disease.
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