Vasovagal syncope

Also known as 'simple fainting'. A cause of syncope.

Definition

The simple faint or vaso-vagal attack (so called because it is mediated by the vagus nerve which supplies the heart) is a result of a failure to maintain an adequate venous return of blood to the heart. This is likely to occur after prolonged periods of standing, particularly if one is standing still or if the climatic conditions are hot. It can also result from an unpleasant or painful experience. Pallor, sweating and a slow pulse are characteristic. Recovery is immediate when the venous return is restored by lying flat.

Source: Black's Medical Dictionary (42nd ed, 2010, ISBN 978-1-4081-0419-4)