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  • Title: [Usefulness of equations based on serum cystatin C concentration in the study of renal function].
    Author: Chiurchiu C, Garces N, Garay G, Holtz R, Douthat W, de Arteaga J, Capra R, Massari PU.
    Journal: Medicina (B Aires); 2007; 67(2):136-42. PubMed ID: 17593597.
    Abstract:
    Serum creatinine is an insensitive marker to identify early changes in glomerular filtration rate (GFR), for this reason alternative methods to estimate renal function result of great clinical importance. Forty-one patients were studied using creatinine clearance modified with cimetidina (Clcrc) as surrogate of GFR, cystatin C-based equations (i.e. Larsson and Hoek formulas), Cockroft-Gault and MDRD abbreviated equations. In the whole group, as well as in those patients with serum creatinine < or =1.2 mg/dl--but reduced renal function: Clcrc 62.01 +/- 17.33 ml/ min/1.73 m(2)-, Larsson and Hoek equations showed higher correlations and lower bias than creatinine-based formulas. Abbreviated MDRD equation showed good performance just in those patients with evident alteration of renal function (serum creatinine > 1.2 mg/dl). We concluded that in patients with different stages of renal function, cystatin C-based equations detect reduction of renal function earlier than the serum creatinine-based formulas.
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