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Medical Author: William C. Shiel Jr., MD, FACP, FACR
Fainting (syncope) is the partial or complete loss of consciousness with interruption of awareness of oneself and ones surroundings. When the loss of consciousness is temporary and there is spontaneous recovery, it is referred to as syncope or, in nonmedical terms, fainting. Syncope accounts for one in every 30 visits to an emergency room. It is pronounced sin-ko-pea.
Syncope is due to a temporary reduction in blood flow and therefore a shortage of oxygen to the brain. This leads to lightheadedness or a "black out" episode, a loss of consciousness. Temporary impairment of the blood supply to the brain can be caused by heart conditions and by conditions that do not directly involve the heart.
Medically Reviewed by a Doctor on 2/27/2012
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Main Article on Fainting
Causes of Fainting
Other Causes of Fainting
Non-heart Causes: Syncope is most commonly caused by conditions that do not directly involve the heart. These conditions include the following:
Heart Causes: Heart conditions that can cause syncope or fainting due to temporary loss of consciousness include:
Medications can cause fainting by altering blood pressure or by affecting the heart.
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