To find articles in Galileo from all databases, use Galileo discover with any of these search terms:
Cardiovascular Technology
Electrocardiograms
Electrocardiography
Cardiovascular System
Cardiology
EKG
Note that after you retrieve the initial set of "hits" from your search, which might include literally thousands of titles, the Refine Results column on the left side of the screen contains several methods of further refining what you're looking for in order to reduce the number of articles to a more relevant and manageable result list.
These Galileo databases are focused on medical information. The search terms listed above can also be used here.
Healthcare Administration Database
Medline Plus ( National Library of Medicine/National Institutes of Health)
Merck Manual (Consumer Version)