Description of Medical Condition Absence of effective mechanical cardiac activity. • This section is not a substitute for an American Heart Association approved ACLS course and is intended only as a quick reference System(s) affected: Cardiovascular Genetics: N/A Incidence/Prevalence in USA: 200:100,000 Predominant age: Increases with age Predominant sex: Male > Female Medical Symptoms and [...]
Description of Medical Condition A defect or opening in the atrial septum allowing flow of blood between the two chambers. Shunting is typically left to right and occurs late in ventricular systole and early diastole. The degree of shunting depends on 1) the size of the defect, and 2) the relative compliance of the two [...]
Description of Medical Condition Atrial fibrillation (AF) is a chronic or paroxysmal arrhythmia characterized by chaotic atrial electrical activity. The electrophysiologic mechanism is most likely multiple reentrant wavelets within the atria. In some patients, triggering premature atrial beats and/or bursts of tachycardia emanate from the pulmonary venous ostia or other sites. Because the AV node [...]

