BACKGROUND: Interpretation of troponin results in patients with acute coronary syndromes (ACS) and renal disease is confused by the fact that renal dysfunction increases troponin levels, regardless of myocardial necrosis. Although it has been demonstrated that end-stage renal disease is associated with elevated cardiac troponin T (cTnT) levels, it is not known whether this biomarker is altered by less than severe degrees of renal impairment. OBJECTIVE: To evaluate whether moderate renal dysfunction is associated with cTnT elevation in patients with ACS. METHODS: One hundred, forty-five individuals with ACS and creatinine clearance > 30 ml/min were studied. Creatinine clearance was estimated by the Cockcroft-Gault formula and cTnT was measured at hospital admission. Moderate renal dysfunction was defined as a creatinine clearance of 30-59 ml/min and positive cTnT as levels > 0.01 ug/l. RESULTS: No correlation was observed between creatinine clearance and cTnT (r = - 0.06, P=0.45). The levels of cTnT were similar among individuals in the first (median=0.05 ug/l), second (median=0 ug/l), third (median=0.07 ug/l) and fourth quartiles (median=0 ug/l) of creatinine clearance - P=0.63. Similarly, there was no difference in troponin values between individuals with moderate renal dysfunction (median=0.02 ug/l) and individuals with normal/near normal function (median=0.03 ug/l) - P=0.63. The prevalence of positive cTnT was similar between individuals with moderate renal dysfunction and normal/near normal renal function (55% vs 52%, P=0.65). CONCLUSION: Moderate renal dysfunction is not associated with cTnT elevation in patients with ACS. (Arq Bras Cardiol 2010; 95(5): 600-605)
Troponin T; kidney disease; coronary disease
