Premature Ventricular Contraction

Premature Ventricular Contraction

A premature ventricular contraction (PVC), also known as a premature ventricular complex, ventricular premature contraction (or complex or complexes) (VPC), ventricular premature beat (VPB), or extrasystole, is a relatively common event where the heartbeat is initiated by Purkinje fibres in the ventricles rather than by the sinoatrial node, the normal heartbeat initiator. The electrical events of the heart detected by the electrocardiogram allow a PVC to be easily distinguished from a normal heart beat.

A PVC may be perceived as a "skipped beat" or felt as palpitations in the chest. In a normal heartbeat, the ventricles contract after the atria have helped to fill them by contracting; in this way the ventricles can pump a maximized amount of blood both to the lungs and to the rest of the body. In a PVC, the ventricles contract first and before the atria have optimally filled the ventricles with blood, which means that circulation is inefficient. However, single beat PVC arrhythmias do not usually pose a danger and can be asymptomatic in healthy individuals.

Read more about Premature Ventricular ContractionCauses, Symptoms, Diagnosis, Treatment, Pathophysiology, Molecular Basis

Other articles related to "ventricular, premature ventricular contraction, contraction":

Aratac - Indications For Use - Ventricular Tachycardia
... Amiodarone may be used in the treatment of ventricular tachycardia in certain instances ... Individuals with hemodynamically unstable ventricular tachycardia should not initially receive amiodarone ... Amiodarone can be used in individuals with hemodynamically stable ventricular tachycardia ...
Third Heart Sound - Associations - Poor Left Ventricular Function
... Post-MI - the death of tissue in the ventricular wall due to loss of blood supply causes wall areas which do not move as well as normal (hypokinesia), or not at all (aki ... Dilated cardiomyopathy - the ventricular walls are abnormal for a variety of reasons, and become thin and stiff so do not relax well ...
List Of Medical Abbreviations: V
... Abbreviation Meaning V ventilation VA visual acuity VAD ventricular assist device vincristine, adriblastine, dexamethasone Vag vaginal VAMP vesicle-associated membrane protein vincristine, adriblastine ...
Premature Ventricular Contraction - Molecular Basis
... is most basically due to an increased amount of cyclic AMP(cAMP) in the ventricular cardiac myocytes leading to increased flow of calcium ions into the cell ... This has the effect of (1) increasing the strength of contraction (inotropy) and (2) depolarizing the myocyte more rapidly (chronotropy) ... The ventricular myocytes are therefore more irritable than usual, and may depolarize spontaneously before the SA node depolarizes ...
Ryanodine Receptor 2 - Clinical Significance
... in the RYR2 gene are associated with catecholaminergic polymorphic ventricular tachycardia, stress-induced polymorphic ventricular tachycardia, and ...

Famous quotes containing the word premature:

    God screens us evermore from premature ideas. Our eyes are holden that we cannot see things that stare us in the face, until the hour arrives when the mind is ripened; then we behold them, and the time when we saw them not is like a dream.
    Ralph Waldo Emerson (1803–1882)