You can easily search a majority of the Penn Libraries journal titles about Cardiothoracic Surgery in Browzine.
Cardiovascular Surgery — Surgery — University of Pennsylvania — BrowZine
Thoracic Surgery — Surgery — University of Pennsylvania — BrowZine
Below are direct links to a selection of these titles.
Difficult Decisions in Cardiothoracic Critical Care Surgery: An Evidence-Based Approach by 
Textbook of Cardiothoracic Surgery by 
