Need help to understand these radiology images for class

Could someone please help me to understand these images and alterations for my imagiology class presentation? We just have these two images and these information: Male, 89y, Atrial fibrilation and previous history of myocardial infarction. It's the first time that i have imagiiology class and I am a little bit lost, thank you very much.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Radiology Source Type: forums