Syncope refers to a transient loss of consciousness due to a sudden fall in blood pressure that temporarily impairs the blood supply to the brain. The most frequent cause of hypotension and syncope (fainting) in apparently normal individuals is neurally mediated syncope, which may also be referred as vasovagal, vasodepressor or reflex syncope. Neurally mediated syncope is an acute hemodynamic reaction produced by a sudden change in the normal pattern of autonomic nervous system activities that maintains blood pressure in the standing posture. Sympathetic activity suddenly decreases while parasympathetic acutely increases. This results in a fall in blood pressure and slowing of the heart.