Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding single view chest examination of ___ . On the frontal view , the findings are unchanged and there is no evidence of any pneumothorax . Again identified are the two standard electrodes in right atrial appendage position and apical portion of right ventricle correspondingly . The third electrode can now be located in greater detail with the help of the lateral view . This third wire is also connected with the same left - sided pacer passes along through the central venous system and when reaching the right atrium makes an anterior gentle curve to return in dorsal direction and apparently entering the venous coronary sinus . It continues for about 3 cm in posterior direction before it curves finally with its tip laterally , so that it rests in a posterior lateral obtuse marginal vein of the coronary venous system . Thus , the wire should activate region of the posterolateral left ventricle . Comparison is extended to a series of chest examinations in ___ . The degree of cardiomegaly appears to be stable . There is no significant pulmonary vascular congestion or any pleural effusion in lateral or posterior pleural sinuses .
    OUTPUT:
    
Appropriate position of all three endovascular pacer electrodes in right atrial appendage , right ventricular apical portion and left posterolateral coronary vein to stimulate left ventricle .