Mean Arterial Pressure
Encyclopedia : M : ME : MEA : Mean Arterial Pressure
The mean arterial pressure (MAP) is a term used in medicine to describe a notional average blood pressure in an individual. It is defined as the average arterial pressure during a single cardiac cycle.
[MAP = (CO \times SVR) + CVP], where
- [CO] is cardiac output
- [SVR] is systemic vascular resistance
- [CVP] is central venous pressure
At normal resting heart rates [MAP] can be approximated using the more easily measured systolic and diastolic pressures, [SP] and [DP]:
- [MAP \simeq DP + \frac(SP - DP)]
- [MAP \simeq DP + \fracPP]
At high heart rates [MAP] is more closely approximated by the arithmetic mean of systolic and diastolic pressures because of the change in shape of the arterial pressure pulse.
[MAP] is considered to be the perfusion pressure seen by organs in the body. It is believed that a [MAP] of greater than 60 mmHg is enough to sustain the organs of the average person under most conditions. If the [MAP] falls significantly below this number for an appreciable time, the end organ will not get enough blood flow, and will become ischemic.
See also
External links
From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.