Re-entry ventricular arrhythmia
Re-entry ventricular arrhythmia | |
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Specialty | Cardiology |
Re-entry ventricular arrhythmia is a type of
Re-entry is divided into two major types: [Anatomically Defined] re-entry and [Functionally Defined] re-entry. The circus movement can occur around an anatomical or functional core. Either type may occur alone, or together.[citation needed]
Anatomically defined re-entry has a fixed anatomic pathway. Anomalous conduction via accessory pathways (APs) creates the re-entry circuit (which are also called bypass tracts), that exists between the atria and ventricles.
Functionally defined re-entry does not require the alternative anatomically defined circuit accessory pathways and it may not reside in just one location.[5] Ventricular fibrillation (VF) following ventricular tachycardia (VT) may be described as a functionally defined re-entry problem caused by multiple mini re-entrant circuits spontaneously created within the ventricular myocardium. The original re-entrant circuit breaks down into multiple mini reentrant circuits.[6] (VF becoming the grand finale of a single prolonged VT larger circus movement, propagating change in the "functional core" of the ventricular myocardium, dissipating mini reentrant circuits, exhibited as ventricular fibrillation.) Ischemia, electrolyte, pH abnormalities, or bradycardia are potential causes of functionally defined re-entry due to changes in the properties of the cardiac tissue's functional core.[2] (No accessory pathway required). For reentry to occur, the path length of circuit should be greater than the wave length (ERP × conduction velocity) of impulse.[citation needed]
See also
- AV reentrant tachycardia
- AV nodal reentrant tachycardia
References
- ^ "Cardiac Arrhythmias". Retrieved 2007-07-21.
- ^ a b Am J Cardiol. 1984 Jul 30;54(2):1A-6A.
- ^ Cardiovascular Physiology & Anesthesia. Morgan, Jr. GE, Mikhail MS, Murray MJ. Chapter 19. Clinical Anesthesiology. 4th ed. New York: McGraw-Hill; 2006.
- ^ a b Hurst's The Heart, 13e.(2011). Chapter 41. Supraventricular Tachycardia: Atrioventricular Nodal Reentry and Wolff-Parkinson-White Syndrome.
- ^ Goodman & Gilman's The Pharmacological Basis of Therapeutics. 12th ed. |Sampson KJ, Kass RS. Chapter 29. Anti-Arrhythmic Drugs.
- ^ Hurst's The Heart, Chapter 38. Mechanisms of Cardiac Arrhythmias and Conduction Disturbances. In V. Fuster, R.A. Walsh, R.A. Harrington (Eds)