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Syncope: Electrocardiographic and Clinical Correlation
Andrea Ungar1, Martina Rafanelli1
1Syncope Unit, Geriatrics and Intensive Care Unit, University of Florence, Azienda Ospedaliero Universitaria Careggi, Viale Pieraccini 6, Florence 50139, Italy.
Insights
Syncope, or fainting, is often caused by heart rhythm issues (arrhythmias). Cardiac syncope significantly raises the risk of death and cardiovascular events, necessitating accurate diagnosis.
Area of Science:
- Cardiology
- Neurology
Background:
- Syncope is a common condition resulting from temporary reduced blood flow to the brain.
- Cardiac syncope is associated with a significantly increased risk of mortality and adverse cardiovascular outcomes.
- Arrhythmias, including bradyarrhythmias and tachyarrhythmias, are primary cardiac causes of syncope.
Purpose of the Study:
- To summarize the causes and diagnostic approaches for syncope, with a focus on cardiac etiologies.
- To highlight the prognostic implications of cardiac syncope.
Main Methods:
- Review of clinical history and physical examination findings.
- Utilization of active standing tests and 12-lead electrocardiograms for initial evaluation.
- Assessment of the diagnostic utility of electrophysiological studies based on pretest probability.
Main Results:
- Cardiac syncope is linked to a doubled risk of all-cause mortality.
- Cardiac syncope increases the risk of both fatal and nonfatal cardiovascular events.
- The effectiveness of electrophysiological studies is contingent upon the initial likelihood of the condition.
Conclusions:
- Arrhythmias represent the most frequent cardiac cause of syncope.
- Comprehensive initial evaluation is crucial for syncope management.
- Electrophysiological study plays a role in diagnosis, guided by pretest probability.
Abstract:
Syncope is a frequent condition, owing to a transient global cerebral hypoperfusion, that may depend on a reduction of vascular total peripheral resistance and/or cardiac output. Cardiac syncope doubled the risk of death from any cause and increased the risk of nonfatal and fatal cardiovascular events. Arrhythmias are the most common cardiac causes of syncope. Both bradyarrhythmias and tachyarrhythmias may predispose to syncope. The first line evaluation relies on clinical history, physical examination, active standing test, 12-lead echocardiogram. The diagnostic yield of electrophysiological study in detecting the cause of syncope depends highly on the pretest probability.
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