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Arrhythmias and Syncope 

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

Nicole P. Sandhu

, Peter A. Brady

, and Robert D. Ficalora

DOI:
10.1093/med/9780199948949.003.0002
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date: 26 February 2020

Abnormal cardiac arrhythmias may be due to reentry, abnormal automaticity, or triggered activity. Reentry is the most common mechanism for cardiac arrhythmias. Automatic rhythms are more common in enhanced sympathetic tone, hypoxia, acid-base and electrolyte disturbances, or atrial or ventricular stretch. Digoxin toxicity is the most common cause of arrhythmias due to triggered activity. Syncope is defined as a transient loss of consciousness with spontaneous recovery. It can be categorized as cardiogenic, noncardiogenic, or unknown. This chapter has three goals: discuss the evaluation and management of cardiac arrhythmias, explain the different types of syncope, and describe the evaluation and management of syncope.

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