الفهرس 
Long term follow up of CRT in CHF predictors of survival
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Abstract
Cardiac resynchronization therapy (CRT) is a relatively new therapy for patients with symptomatic heart failure resulting from systolic dysfunction. CRT is one of the aspects of treating congestive heart failure in patients with wide QRS complex, LVEF of {u2264} 35% and NYHA class II and IV. The study focuses on the pre CRT implantation and post implantation in NYHA class, ECG morphology with QRS width and echocardiographic changes in LVEF, LVEDD, LVESD, PASP and MR, TR that occurs in patients after CRT implantation and the effect of CRT on clinical outcome and mortality of patients within 1-3 years after implantation. Our study population included 80 patients, 17 patients were dead and 5 patients failed to contact so 58 patients were followed up. Mean age of baseline patients were 62.63 ± 8.9 years; There were 61 males (76.2%) and 19 females (2.8%). 48 patients (60%) had dilated cardiomyopathy (DCM) as a cause of heart failure and 32 patients (40%) had ischemic cardiomyopathy (ICM). We defined echocardiographic responders as an increase in LVEF{u2265} 5%, 1-3 years after CRT implantation