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Syncope: diagnosis of cardiac and noncardiac causes
P M Farrehi1, J T Santinga, K A Eagle
1Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, USA.
Insights
Syncope, a temporary loss of consciousness, poses risks like falls and sudden cardiac death in older adults. Diagnosis often relies on history and physical exams, with further testing for unexplained cases.
Area of Science:
- Cardiology
- Geriatrics
- Neurology
Background:
- Syncope is a transient loss of consciousness unrelated to trauma or seizures.
- Older adults (65+) face increased risks of syncope-related falls and sudden cardiac death.
- Causes are broadly categorized as cardiovascular (electrical/mechanical) or noncardiovascular.
Purpose of the Study:
- To summarize the causes and diagnostic approaches for syncope, particularly in elderly patients.
- To highlight the importance of differentiating cardiac from non-cardiac etiologies.
- To outline the indications for advanced diagnostic testing.
Main Methods:
- Review of existing literature on syncope etiology and diagnosis.
- Emphasis on clinical history and physical examination findings.
- Discussion of diagnostic tools including ECG, Holter monitoring, and electrophysiology studies.
Main Results:
- Cardiovascular causes include arrhythmias and mechanical obstructions.
- Noncardiovascular causes encompass orthostatic hypotension, vasovagal reactions, and neurological events.
- A comprehensive history and physical exam are crucial for initial diagnosis.
- Extensive testing is reserved for unexplained syncope after initial evaluation.
Conclusions:
- Syncope in older adults requires careful evaluation due to associated risks.
- Diagnostic strategies should be tailored based on clinical presentation.
- Early identification of underlying causes is vital for appropriate management and prevention of adverse outcomes.
Abstract:
Syncope is a sudden and temporary loss of consciousness not caused by trauma or seizures. Patients age 65 and older are at elevated risk of syncope-related falls and sudden cardiac death. Cardiovascular causes are generally electrical (ie, arrhythmias) or mechanical (obstruction of central circulation at a cardiac valve or major vascular structure). Noncardiovascular causes include orthostatic hypotension, vasovagal reaction, micturition, carotid sinus hypersensitivity, and neurologic (eg, TIAs). Many causes of syncope can be diagnosed from a thorough history and physical exam. More extensive testing--ECG, Holter monitoring, electrophysiology study--may be indicated for selected patients with unexplained syncope and an unremarkable evaluation.