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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

[edit] Calculation

math, where[1]

math is usually small enough to be neglected in this formula.

[edit] Estimation

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

math

or

math

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


or equivalently

math

where math is the pulse pressure, math

At high heart rates 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.

[edit] Clinical significance

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

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

If the math 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

[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


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