Abstract
Introduction: Cardiac resynchronization therapy (CRT) has rapidly evolved as a standard therapy for heart failure (HF) patients. Higher levels of B-type natriuretic peptide (BNP) and N-terminal proBNP (NT-proBNP) are typically used in the diagnosis of HF. Materials and Methods: A prospective, observational study of 60 patients with CRT was evaluated with clinical, laboratory and echocardiographic parameters. All patients underwent clinical examination, 6-min walk test, 12-lead electrocardiogram, two-dimensional echocardiographic with Doppler evaluations and NT-proBNP determination. Results: After effective CRT in patients, there was significant improvements in New York Heart Association functional class and 6-min walked distance along with significant decrease in mean QRS width and NT-proBNP plasma levels at 3 and 6 months' follow-up (P
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