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Arrhythmias and Syncope 

Arrhythmias and Syncope
Chapter:
Arrhythmias and Syncope
Author(s):

Peter A. Noseworthy

DOI:
10.1093/med/9780190464868.003.0003
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date: 19 October 2019

Cardiac arrhythmias are due to disorders of impulse propagation (reentry) or impulse formation (abnormal automaticity or triggered activity). Reentry is the most common mechanism of arrhythmia and is further classified as macroreentrant or microreentrant. Macroreentrant arrhythmias have a discrete, definable circuit such as atrioventricular (AV) reentrant tachycardia (sustained over AV nodal, ventricular, accessory pathway, and ventricular tissue) or ventricular tachycardia (sustained around an area of myocardial scar or infarcted tissue). Microreentry occurs within a circuit that is too small to be mapped and thus appears to arise from a single point in the myocardium.

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