Mean arterial pressure: Difference between revisions
No edit summary |
No edit summary |
||
Line 14: | Line 14: | ||
}} | }} | ||
{{SI}} | {{SI}} | ||
{{CMG}} | {{CMG}} | ||
{{editor Help}} | {{editor Help}} | ||
{{WikiDoc Cardiology Network Infobox}} | |||
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]]. | 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]]. | ||
Line 71: | Line 70: | ||
[[Category:Physical examination]] | [[Category:Physical examination]] | ||
[[Category: | [[Category:ICU medicine]] | ||
[[Category:Emergency medicine]] | [[Category:Emergency medicine]] | ||
[[Category:Cardiology]] | [[Category:Cardiology]] |
Revision as of 21:06, 19 January 2009
Mean arterial pressure |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Please Take Over This Page and Apply to be Editor-In-Chief for this topic: There can be one or more than one Editor-In-Chief. You may also apply to be an Associate Editor-In-Chief of one of the subtopics below. Please mail us [2] to indicate your interest in serving either as an Editor-In-Chief of the entire topic or as an Associate Editor-In-Chief for a subtopic. Please be sure to attach your CV and or biographical sketch.
Cardiology Network |
Discuss Mean arterial pressure further in the WikiDoc Cardiology Network |
Adult Congenital |
---|
Biomarkers |
Cardiac Rehabilitation |
Congestive Heart Failure |
CT Angiography |
Echocardiography |
Electrophysiology |
Cardiology General |
Genetics |
Health Economics |
Hypertension |
Interventional Cardiology |
MRI |
Nuclear Cardiology |
Peripheral Arterial Disease |
Prevention |
Public Policy |
Pulmonary Embolism |
Stable Angina |
Valvular Heart Disease |
Vascular Medicine |
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.
Calculation
<math>MAP = (CO \times SVR) + CVP</math>, where[1]
- <math>CO</math> is cardiac output
- <math>SVR</math> is systemic vascular resistance
- <math>CVP</math> is central venous pressure
<math>CVP</math> is usually small enough to be neglected in this formula.
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>:[2][3]
- <math>MAP \simeq DP + \frac{1}{3}(SP - DP)</math>
or
- <math>MAP \simeq \frac{2}{3}DP + \frac{1}{3}SP</math>
MAP = [(2 x diastolic) + systolic] / 3
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> of greater than 60 mmHg is enough to sustain the organs of the average person under most conditions.
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
- ↑ Cardiovascular Physiology Concepts: Mean Arterial Pressure, Richard E. Klabunde, Ph.D
- ↑ Essentials of Human Physiology by Thomas M. Nosek. Section 3/3ch7/s3ch7_4.
- ↑ http://www.nda.ox.ac.uk/wfsa/html/u10/u1002_03.htm
de:Mittlerer arterieller Druck