Inducing syncope: the fainting lark

When seeing patients with syncope, it is important to know what a syncope looks like. The videos below are part of a study by Lempert et al. (1994). “Syncope: a videometric analysis of 56 episodes of transient cerebral hypoxia”. The subjects are medical students performing the fainting lark.
The fainting lark consists of:

  1. Squatting
  2. Hyperventilating
  3. Rising from squatting
  4. Straining

During the fainting lark blood pressure drops markedly and the subjects lose consciousness. When in the supine position blood pressure restores and consciousness is regained.