Orthostatic hypotension (aka postural hypotension, orthostasis, head rush, dizzy spell) is hypotension where a Pt's BP falls when suddenly standing up or stretching.

• Fall in systolic BP, of 20mmHg+, or diastolic BP of 10mmHg+, when a Pt assumes a standing position

• Caused by blood pooling in the lower extremities upon a change in body position
• It is often associated with shock, although not necessarily indicative of it
• For some people who exercise and are in top physical condition, low blood pressure is a Sx of good health and fitness
• For many patients, excessively low blood pressure can cause dizziness and fainting, or indicate serious heart, endocrine, or neurological disorders
• Severely low blood pressure can deprive the brain and other vital organs of oxygen and nutrients, causing life threatening shock

• Quite common
• Can occur briefly in anyone, prevalent in particular among the elderly, and those w/ low BP

• Hypotension (category)