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The heart is the center focus of cardiology, and has been used extensively outside of the anatomical meaning such as an idiom (“The heart of Alcatraz is the prison.”) and figuratively (e.g., the song I Left My Heart in San Francisco). As the focus of cardiology, the heart has numerous anatomical features (e.g., atria, ventricles, heart valves) and numerous physiological features (e.g., systole, heart sounds, afterload) that are of concern. Disorders of the heart leads to heart disease and cardiovascular disease and they lead to a significant number of deaths: cardiovascular disease is the leading cause of death and caused 29.34% of all deaths in 2002. The primary responsibility of the heart is to pump blood around the body. It pumps blood from the body — called the systemic circulation — through the lungs — called the pulmonary circulation — and then back out to the body. This means that the heart is connected and affects the entirety of the body. While plenty is known about the healthy heart, the bulk of the study in cardiology is in the disorders of the heart and restoration, where possible, of function. The heart is a muscle that squeezes blood and functions like a pump. Each part of the heart is susceptible to failure or dysfunction and the heart could be divided into the mechanical and the electrical. The electrical part of the heart is centered on the periodic contraction (squeezing) of the muscle cells that is caused by the cardiac pacemaker located in the sinoatrial node. The study of the electrical aspects is a subfield of electrophysiology called cardiac electrophysiology and is epitomized with the electrocardiogram (ECG/EKG). The action potentials generated in the pacemaker propagate throughout the heart in a specific pattern and is the system that carries this potential is called the electrical conduction system. Dysfunction of the electrical system manifests in many ways and includes Wolff–Parkinson–White syndrome, ventricular fibrillation, and heart block.

USMLE Step2 Kaplan Cardiology Lectures videos

USMLE Step2 Kaplan Cardiology Lectures video 01a  | Download
USMLE Step2 Kaplan Cardiology Lectures video 01b | Download
USMLE Step2 Kaplan Cardiology Lectures video 02 | Download
USMLE Step2 Kaplan Cardiology Lectures video 03 | Download
USMLE Step2 Kaplan Cardiology Lectures video 04 | Download
USMLE Step2 Kaplan Cardiology Lectures video 05 | Download