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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.
The first symptoms may be nonspecific, such as anxiety and restlessness. The skin then becomes cool and diaphoreticâa tipoff to this emergency. The three classic signs of cardiac tamponade, called Beck's triad, are: muffled heart sounds, increased jugular vein distention (JVD), and hypotension. The heart sounds become muffled and distant because of the insulating effects of fluid in the pericardial sac.