Mean arterial pressure

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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.

Contents 1 Calculation 2 Estimation 3 Clinical significance 4 See also 5 References

[edit] Calculation

, where^[1]

• is cardiac output
• is systemic vascular resistance
• is central venous pressure

is usually small enough to be neglected in this formula.

[edit] Estimation

At normal resting heart rates can be approximated using the more easily measured systolic and diastolic pressures, and :^[2][3]

or

MAP = [(2 x diastolic) + systolic] / 3

or equivalently

where is the pulse pressure,

At high heart rates is more closely approximated by the arithmetic mean of systolic and diastolic pressures because of the change in shape of the arterial pressure pulse.

[edit] Clinical significance

is considered to be the perfusion pressure seen by organs in the body.

It is believed that a that is greater than 60 mmHg is enough to sustain the organs of the average person.

If the falls significantly below this number for an appreciable time, the end organ will not get enough blood flow, and will become ischemic.

[edit] See also

• Blood pressure
• Hypertension
• Pulse pressure

[edit] References

1. ↑ Cardiovascular Physiology Concepts: Mean Arterial Pressure, Richard E. Klabunde, Ph.D
2. ↑ Physiology at MCG 3/3ch7/s3ch7_4
3. ↑ http://www.nda.ox.ac.uk/wfsa/html/u10/u1002_03.htm

This page uses content from the English-language version of Wikipedia. The original article was at Mean arterial pressure. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.