Postural Orthostatic Tachycardia Syndrome

**Semantic type:** Disease or Syndrome

**Definition:** A syndrome characterized by orthostatic intolerance resulting in tachycardia, often accompanied by a decrease in the blood pressure. It occurs when individuals change from the supine position to an upright position. Other signs and symptoms include lightheadedness, fainting, fatigue and muscle weakness.

**Synonyms:** - POTS - Postural orthostatic tachycardia syndrome