Premature ventricular contractions (PVCs) are early or extra heartbeats that commonly occur and are usually harmless in normal hearts, but can cause problems in hearts with pre-existing disease.
Abnormally fast heart rates are classified into two types: supraventricular (meaning "above the ventricle") tachycardias, those that arise in the atria (plural of atrium) or the atrioventricular node, and ventricular tachycardias.
In both instances, an extra or early beat may trigger the rapid rhythms....
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Source: ADAM Encyclopedia
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Source: HealthCentral Encyclopedia
Article updated and reviewed by Neil Siecke, MD, Clinical Insturctor, UCSD Division of Cardiology. Editorial review provided by VeriMed Healthcare... Read more »
Source: ADAM Encyclopedia
Ventricular tachycardia (VT) is a rapid heartbeat that starts in the ventricles.Alternative NamesWide-complex tachycardia; V tach; Tachycardia -... Read more »
Source: ADAM Encyclopedia
VF; Fibrillation - ventricular Symptoms A person who has a VF episode will suddenly collapse or become unconscious, because the brain... Read more »