We aimed to Evaluation of left ventricular function by Echocardiography post Percutaneous Coronary Intervention to totally occluded coronary arteries. Methods: In 100 consecutive patients with chronic totally occluded coronary vessel, LV systolic function were measured by transthoracic Echocardiograrphy before and after successful CTO PCI. Results: The study was conducted on 100 patient collected from department of cardiology , Fayoum University all patients were diagnosed as chronic total occlusion of coronary arteries , L.V systolic function was compared between pre-procedural echocardiographic study and that done within 6 months after the procedure. L.V. Function Improvement was observed in 76% of patients. With no change in 14% and worsening in 10% of studied patints. Conclusion: PCI for a CTO has a beneficial effect on LV functions, myocardial contractility .