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Vasovagal Syncope. Vasovagal syncope (also called cardioneurogenic syncope) is a temporary loss of consciousness caused by a neurological reflex that produces either sudden dilation of the blood vessels in the legs, or a very slow heart rate (bradycardia), or both.
Heart Causes: Heart conditions that can cause syncope or fainting due to temporary loss of consciousness include: 1  Abnormal heart rhythms (heart beating too fast or too slow). 2  Abnormalities of the heart valves (pulmonic valve stenosis). 3  Widespread disease of the heart muscle (cardiomyopathy).