Common types of UC include: 1  proctosigmoiditis, which affects the rectum and lower portion of the colon. 2  left-sided colitis, which affects the left side of the colon beginning at the rectum.  total colitis, which affects the entire large intestine.
Vasovagal syncope. Vasovagal syncope is a sudden loss of consciousness mediated by the vagus nerve. It occurs when the vagus nerve is overreactive to certain triggers, such as the sight of blood or extreme emotional distress, and causes a sudden drop in blood pressure.
Reflex syncope and in particular vasovagal syncope is the most common indication for a tilt table test. The test starts with a resting phase in which patients are kept supine for 10 min, followed by a âpassive phaseâ, in which the table is tilted head up between 60 and 80Â° for 20 min.