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Ashman beats are described as wide complex QRS complexes that follow a short R-R interval preceded by a long R-R interval. [3] This short QRS complex typically has a right bundle branch block morphology and represents an aberrantly conducted complex that originates above the AV node, rather than a complex that originates in either the right or left ventricle.
Atrial fibrillation is associated with an increased risk of heart failure, dementia, and stroke. [3] [12] It is a type of supraventricular tachycardia. [14] Atrial fibrillation frequently results from bursts of tachycardia that originate in muscle bundles extending from the atrium to the pulmonary veins. [15]
Synchronized electrical cardioversion is used to treat hemodynamically unstable supraventricular (or narrow complex) tachycardias, including atrial fibrillation and atrial flutter. It is also used in the emergent treatment of wide complex tachycardias, including ventricular tachycardia, when a pulse is present.
As this PAC conducts down the left bundle, it will depolarize the septum then proceed retrograde up the right bundle. Eventually, this will reach refractory conduction tissue and stop. The subsequent beat — if early enough — will find the right bundle still refractory and the process will repeat yielding a continued RBBB morphology.
During the relative refractory period, a new action potential can be elicited under the correct circumstances. The cardiac refractory period can result in different forms of re-entry, which are a cause of tachycardia. [1] [B: 3] Vortices of excitation in the myocardium (autowave vortices) are a form of re-entry.
XEN-D0101 is a Kv1.5 antagonist that selectively prolongs the atrial refractory period. By prolonging the refractory period XEN-D0101 allows the atria to fully relax and not contract prematurely. XEN-D0101 selectively increases atrial refractory period by 22% in dogs with atrial tachycardia induced electrical remodeling. [2]
refractory anemia rheumatoid arthritis right atrium room air RAD: reflex anal dilatation right axis deviation reactive airway disease radiation absorbed dose reactive attachment disorder: Rad hys: radical hysterectomy: RAE: right atrial enlargement RAI: radioactive iodine: RAIU: thyroid reactive iodine uptake RAPD: relative afferent pupillary ...
Effective refractory period in green. In electrocardiography, during a cardiac cycle, once an action potential is initiated, there is a period of time that a new action potential cannot be initiated. This is termed the effective refractory period (ERP) of the tissue.