Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient 's condition required examination in sitting upright position using AP frontal and left lateral views . Comparison is made with the examination of the preceding day , ___ . On the frontal view , the findings are unchanged . There is status post sternotomy and the presence of multiple surgical clips mostly in the anterior left - sided mediastinum are indicative of previous bypass surgery . Moderate cardiac enlargement is present ; prominence of the left ventricular contour to the left and posteriorly . Left atrial enlargement appears moderate . A permanent pacer device is again identified in left anterior axillary position . There exists a total of three intracavitary electrodes . One of these terminates in a position compatible with right atrial appendage . The second , a ICD cable with enforced electrodes and terminating in the apical portion of the right ventricle . A third electrode aims at stimulation of the left ventricular myocardium and is seen to enter the venous coronary sinus from the right atrium advancing in rectrograde direction until reaching the level of the contour of the left atrium when the electrode turns into left - sided direction to terminate at the superior and slightly posterior direction . This termination point is compatible with a obtuse marginal coronary vein in rather central position . Evaluation of the entire electrode course required manipulation with density changes on the lateral view . Again there is no evidence of pneumothorax and the pulmonary vasculature does not show any significant signs of vascular congestion . No pleural effusions are found in the lateral or posterior pleural sinuses .
    OUTPUT:
    
Third electrode for left myocardial stimulation via coronary venous system terminates in a location compatible with proximal portion of the left ventricular lateral wall . Considering findings as illustrated on previous echocardiogram , the electrode is likely to stimulate the better preserved portions of the left ventricle . Appropriate capture , however , must be confirmed electrographically .