Mean arterial pressure

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The mean arterial pressure (MAP) is a term used in medicine to describe an average blood pressure in an individual.[1] It is defined as the average arterial pressure during a single cardiac cycle.

Calculation

Mean arterial pressure can be determined from:[2]

<math>MAP = (CO \times SVR) + CVP</math>

where:

Estimation

At normal resting heart rates <math>MAP</math> can be approximated using the more easily measured systolic and diastolic pressures, <math>SP</math> and <math>DP</math>:[3][4][5]

<math>MAP \simeq DP + \frac{1}{3}(SP - DP)</math>

or equivalently

<math>MAP \simeq \frac{2}{3}(DP) + \frac{1}{3}(SP)</math>

or equivalently

<math>MAP \simeq \frac{(2 \times DP) + SP}{3}</math>

or equivalently

<math>MAP \simeq DP + \frac{1}{3}PP</math>

where <math>PP</math> is the pulse pressure, <math>SP-DP</math>


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

Clinical significance

<math>MAP</math> is considered to be the perfusion pressure seen by organs in the body.

It is believed that a <math>MAP</math> that is greater than 60 mmHg is enough to sustain the organs of the average person.

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

See also

References

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de:Mittlerer arterieller Druck

pl:Średnie ciśnienie tętnicze

sv:Medelartärtryck
  1. Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
  2. Cardiovascular Physiology Concepts: Mean Arterial Pressure, Richard E. Klabunde, Ph.D
  3. Physiology at MCG 3/3ch7/s3ch7_4
  4. Cardiovascular Physiology (page 3)
  5. http://www.clinicalreview.com Physiology Review