Syncope – Causes, Symptoms and Treatment
Syncope is a brief, temporary loss of consciousness caused by reduced blood flow to the brain. It starts suddenly and resolves spontaneously without medical intervention.
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Syncope is a brief, temporary loss of consciousness caused by reduced blood flow to the brain. It starts suddenly and resolves spontaneously without medical intervention.
What is Syncope?
Syncope (commonly known as fainting or blackout) is a sudden, transient loss of consciousness caused by a temporary reduction in cerebral blood flow. The episode is typically self-limiting, meaning the affected person regains consciousness within seconds to a few minutes without medical treatment. Syncope is a common medical event that can occur at any age and has a wide range of underlying causes.
Causes
Syncope is broadly classified into three main categories based on its underlying cause:
Reflex Syncope (Neurocardiogenic Syncope)
This is the most common type. It results from an exaggerated reflex response of the nervous system that causes a sudden drop in blood pressure and/or slowing of the heart rate. Common triggers include emotional stress, pain, prolonged standing, or exposure to heat.
Orthostatic Hypotension
This occurs when blood pressure drops upon standing up from a sitting or lying position. Contributing factors include dehydration, certain medications (e.g., antihypertensives), or autonomic nervous system disorders.
Cardiac Syncope
This form is caused by heart conditions such as arrhythmias (abnormal heart rhythms), structural heart defects, or impaired cardiac output. Cardiac syncope is often the most serious type and requires prompt evaluation.
Symptoms
Syncope is often preceded by warning signs known as presyncope:
- Dizziness or lightheadedness
- Visual disturbances or tunnel vision
- Nausea
- Pallor and sweating
- Ringing in the ears or muffled hearing
The syncopal episode itself involves a complete but brief loss of consciousness with loss of muscle tone, causing the person to fall. Recovery is typically rapid and complete.
Diagnosis
The diagnostic evaluation of syncope begins with a thorough medical history and physical examination. Additional diagnostic tests may include:
- ECG (electrocardiogram) to assess heart rhythm
- Holter monitor for detecting intermittent arrhythmias
- Tilt table test to diagnose neurocardiogenic syncope
- Blood pressure measurements in lying and standing positions (orthostatic test)
- Blood tests (e.g., blood glucose, complete blood count)
- Echocardiography if a structural heart condition is suspected
Treatment
Treatment depends on the underlying cause of the syncope:
Reflex Syncope
General measures are often sufficient: adequate fluid intake, avoidance of known triggers, physical counterpressure maneuvers (e.g., leg crossing, hand gripping) when warning symptoms occur, and muscle tensing exercises. Medications may be prescribed in selected cases.
Orthostatic Hypotension
Recommended strategies include adequate fluid and salt intake, rising slowly from a seated or lying position, adjusting medications, and wearing compression stockings.
Cardiac Syncope
Depending on the cause, treatment may involve medications, implantation of a pacemaker or implantable cardioverter-defibrillator (ICD), or surgical intervention.
When to See a Doctor?
Every episode of syncope should be evaluated by a healthcare professional, especially if it occurs during physical exertion, is accompanied by palpitations or chest pain, recurs frequently, or if there is a family history of sudden cardiac death. Prompt assessment is also essential in elderly individuals or those with known heart disease.
References
- Brignole M et al. - 2018 ESC Guidelines for the diagnosis and management of syncope. European Heart Journal, 2018.
- Moya A et al. - Guidelines for the diagnosis and management of syncope. European Heart Journal, 2009.
- German Society of Cardiology (DGK) - Guidelines on Syncope, 2018.
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