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Dizziness and loss of consciousness. Cardiovascular causes
Jeremy J Wright1, Leonard F Arnolda
1Advanced Heart Failure and Cardiac Transplant Unit, Royal Perth Hospital, Western Australia. jeremy.wright@health.wa.gov.au
Insights
This article provides a practical guide for identifying cardiovascular causes of dizziness and loss of consciousness (syncope). Accurate diagnosis is crucial as cardiac syncope carries higher risks than benign causes like fainting.
Area of Science:
- Cardiology
- Neurology
- General Practice
Background:
- Dizziness and loss of consciousness are frequent reasons for patient consultations in general practice.
- Transient loss of consciousness, or syncope, can stem from various underlying pathologies.
Purpose of the Study:
- To offer a pragmatic and logical approach for practitioners to diagnose cardiovascular causes of dizziness and syncope.
- To differentiate between benign and potentially serious causes of transient loss of consciousness.
Main Methods:
- Review of common causes of syncope.
- Emphasis on differentiating vasovagal reactions and postural hypotension from cardiac etiologies.
- Highlighting the diagnostic imperative for cardiac syncope.
Main Results:
- Syncope results from interrupted blood flow to the brain, with syncope and seizures being the primary causes of recurrent episodes.
- Vasovagal reactions and postural hypotension are common, benign causes of syncope.
- Cardiac disorders, including arrhythmias and outflow obstruction, are significant causes of syncope.
Conclusions:
- Cardiac causes of syncope are associated with substantially higher morbidity and mortality compared to postural hypotension or vasovagal syncope.
- Accurate diagnosis of syncope is essential for initiating appropriate and potentially life-saving treatments.
- Distinguishing cardiac syncope is critical for patient outcomes.
Background:
Dizziness and loss of consciousness are common clinical problems presenting in general practice.
Objective:
This article aims to provide the practitioner with a pragmatic and logical approach to identifying the cardiovascular causes of dizziness and loss of consciousness.
Discussion:
A range of disorders with varying pathology cause a transient loss of consciousness associated with postural collapse (syncope) by interruption of blood flow to the brain. Syncope and seizures are the only common causes of recurrent episodes of loss of consciousness. The vasovagal reaction or 'common faint' and postural hypotension are both common and benign causes of syncope. Syncope can also result from cardiac causes that include disorders of cardiac rhythm and mechanical obstruction to cardiac output. Cardiac causes of syncope are associated with much higher morbidity and mortality than postural hypotension or fainting. Specific treatment is available for the various cardiac causes of syncope and thus accurate diagnosis is imperative.