- CTSNet - online resource for cardiothoracic surgeons.
- Gross Physiology of the Cardiovascular System - global overview of the mechanical function of the cardiovascular system including the factors governing cardiac output.
- MedBioWorld - links to cardiology associations and databases.
- CathLab.com - education, companies, classifieds, calendar, publications, and organizations.
- The Heart: An Online Exploration - discover the complexities of its development and structure, follow the blood through the blood vessels, learn how to have a healthy heart and how to monitor your heart's health, and more.
- Endothelinscience.com - discusses the role of endothelin (ET), the third major neurohormonal pathway, in cardiopulmonary diseases such as pulmonary arterial hypertension and heart failure.
- TheHeart.org - provides news and educational resources for cardiologists and healthcare professionals.
- Cardiology Page - information on heart disease and investigational procedures.
- Cardiology Explained - cardiology and heart disease information and definitions presented by Robert Matthews, MD.
- CardioGuide - search engine and cardiac disorders custom medline searching.
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