Medicine & HealthcareVital SignsGCSE

Mean Arterial Pressure (MAP) Calculation Calculator

Calculates the average arterial pressure during a single cardiac cycle, indicating organ perfusion.

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Mean Arterial Pressure

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Overview

Mean Arterial Pressure (MAP) represents the average pressure in a patient's arteries during one cardiac cycle. It is a critical indicator of organ perfusion, as it reflects the pressure that drives blood into the tissues. Unlike simple average, MAP is weighted more heavily towards diastolic pressure because the heart spends approximately two-thirds of the cardiac cycle in diastole (relaxation phase).

Symbols

Variables

= Systolic BP, = Diastolic BP, = Mean Arterial Pressure

Systolic BP
mmHg
Diastolic BP
mmHg
Mean Arterial Pressure
mmHg

Apply it well

When To Use

When to use: This equation is used in clinical settings to assess a patient's circulatory status, particularly in critical care, shock management, and hypertension. It is applied when both systolic and diastolic blood pressure readings are available, and a more accurate measure of tissue perfusion than just systolic or diastolic pressure is needed.

Why it matters: MAP is a crucial physiological parameter because it directly correlates with the perfusion of vital organs. A MAP below 60-65 mmHg typically indicates insufficient blood flow to organs, potentially leading to ischemia and organ damage. Conversely, excessively high MAP can indicate severe hypertension, increasing the risk of cardiovascular events. Monitoring MAP helps guide treatment decisions to maintain adequate organ perfusion.

Avoid these traps

Common Mistakes

  • Simply averaging SBP and DBP (e.g., (SBP+DBP)/2), which does not account for the longer diastolic phase.
  • Incorrectly performing the order of operations, especially the subtraction within the parentheses.

One free problem

Practice Problem

A patient's blood pressure is measured at 120/80 mmHg. Calculate their Mean Arterial Pressure (MAP).

Systolic BP120 mmHg
Diastolic BP80 mmHg

Solve for: MAP

Hint: Remember to perform the subtraction within the parentheses first.

The full worked solution stays in the interactive walkthrough.

References

Sources

  1. Guyton and Hall Textbook of Medical Physiology