Mean Arterial Pressure (MAP)


Calculates mean arterial pressure.
Systolic BP (mm Hg) :
Diastolic BP(mm Hg) :



Your mean arterial pressure is : mm Hg

Your pulse pressure is : mm Hg


 

Interpretation of mean arterial pressure

MAP is is considered to be the perfusion pressure of the body.

The MAP ranges are classified into the following levels:

  • Classification of MAP


    Category

    mean arterial pressure (MAP)

    Optimal

    <93.33

    Normal

    93.33 -99

    High normal

    99.01 -105.67

    Grade 1 Hypertension (Mild)

    105.68 - 119

    Grade 2 Hypertension (Moderate)

    119.01-132.33

    Grade 3 Hypertension (Sever)

    ≥132.34

    Low Level: MAP less than 60 mmHg comes under this level.

    Reference:

    Kundu et al.; Mean Arterial Pressure Classification: A Better Tool for Statistical Interpretation of Blood Pressure Related Risk Covariates, Cardiology and Angiology: An International Journal 6(1): ISSN: 2347-520X, NLM ID: 101658392 2017, DOI: 10.9734/CA/2017/30255

    Forther readings - What is Mean Arterial Pressure (MAP)?

    MAP is the measurement that explains the average blood pressure in a person's blood vessels during a single cardiac cycle. Mean arterial pressure is significant because it measures the pressure necessary for adequate perfusion of the organs of the body. It is considered by many to be a better indication of perfusion than systolic blood pressure. It is vital to have a MAP of at least 60 mmHg to provide enough blood to the coronary arteries, kidneys, and brain. The normal MAP range is between 70 and 100 mmHg. Mean arterial pressures that deviate from this range for prolonged periods of time can have drastic negative effects on the body.

    Too high: High MAP can cause stress on the heart because it has to work harder than normal to push against the elevated pressure in the vessels. It can lead to advanced heart disease, blood clots, heart attack, and stroke. Prolonged elevated MAP results in heart muscle enlargement, which jeopardizes the life expectancy of the heart.

    Too Low: Low MAP can be life threatening as well. When the MAP gets below 60, vital organs in the body do not get the nourishment they need for survival. When it gets low, it can lead to shock and eventually death of cells and organ systems. Low mean arterial pressure can be caused by sepsis, stroke, hemorrhaging, or trauma.

    MAP is directly affected by factors such as:

  • Amount of blood pumped out of the heart per minute (cardiac output)

  • Heart rate (beats per minute)

  • Blood pressure

  • Resistance to blood flow in the vessels

  • A change in any of these factors will alter the mean arterial pressure and cause negative effects on the body

Pulse Pressure

Another important number is the pulse pressure, which is defined as the difference between the systolic and diatolic blood pressure. Normal pulse pressure at rest is 40 mmHg. This can go up to 100 mmHg during exercise.

PP = SBP - DBP

Theoretically, the pulse pressure is proportional to the amount of blood pumped by the heart in each contraction and is inversely proportional to the aorta compliance (elasticity). One important function of the aorta is to dampen the pulsatile output of the left ventricle and reduce the blood pressure. If the aorta becomes rigid, the pulse pressure can be very high.

A pulse pressure is abnormally low if it is less than 25% of the systolic pressure. This normally indicates a drop in the left ventricular stroke volume. If the pulse pressure falls below 25 mmHg, congestive heart failure or shock becomes very likely.

If the pulse pressure is consistently at 60 mmHg or above, causes can be stiffiness in major arteries, leak in aortic value, anemia, and hyperthyroidism. High pulse pressure tends to accelerate normal aging of body organs, including the heart, brain and kidneys.