Syncope (Fainting)
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Definition of Syncope (Fainting)
Syncope is the medical term for fainting. This is a brief lapse in consciousness caused by transient cerebral hypoxia (diminished oxygen).Syncope usually is preceded by a sensation of light-headedness and may often be prevented by lying down or by sitting with the head between the knees. It may be caused by many different factors including emotional stress, vagal (nerve) stimulation, pooling of blood in the legs, or sudden change in environmental temperature or body position.
Syncope must be separated from seizures and other states of altered consciousness such as dizziness, vertigo, coma, and narcolepsy.
Description of Syncope (Fainting)
Fainting (syncope) occurs when the blood supply in the brain is temporarily inadequate and is restored in a minute or so. There are many causes of fainting, ranging from benign to serious. A fainting episode can have no medical significance or it can be a symptom of a serious disorder. Some people faint at the sight of blood, after intense pain, emotional shock, or as a result of severe anxiety or fatigue. This is due to reflexes that slow the heart and dilate blood vessel resulting in a fall in blood pressure.
Fainting is not uncommon during the early stages of pregnancy. Cardiovascular, neurological, and metabolic problems (such as hypoglycemia), and adverse drug reactions are also causes of fainting. Anyone who experiences a fainting episode or "blackout" should see a doctor to determine the cause.
Loss of consciousness is reported by 12 to 48 percent of young adults. Approximately one-third of these are related to trauma or ingestion of ethanol and the remaining are syncope.
Syncope also is a common presenting complaint accounting for 1 to 6 percent of hospital admissions and 3 percent of emergency room visits. Syncope is also common in the elderly.
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