Subcostal 4-chamber view – pulmonary embolism and normal. A: Subcostal 4-chamber view - pulmonary embolism. Notice the dilated right ventricle and bulging of the septum into the left ventricle in the pathological echocardiogram because of the increased pressure in the right ventricle (arrows). The pattern of the septum can often be seen even when image-quality is low. B: Subcostal 4-chamber view – normal. RA = Right Atrium, RV = Right Ventricle, LA = Left Atrium, LV = Left Ventricle.