MAP

What is it?

MAP, or mean arterial pressure, is defined as the average pressure in a patient’s arteries during one cardiac cycle. It is considered a better indicator of perfusion to vital organs than systolic blood pressure (SBP).

High MAP

A MAP that is above 105 mmHg indicates the heart is having to work much harder than it should and can cause stress on the heart.

Low MAP

Spinal and cerebral perfusion become inadequate at a MAP lower than 60. Once this happens physiological symptoms maybe notable. It is important to correct this imbalance as quickly as possible.

Calculating MAP

To calculate a mean arterial pressure, double the diastolic blood pressure and add the sum to the systolic blood pressure. DBPx2 + SBP / 3 =

Causes for Low MAP
  • Sepsis
  • Hemorrhage (bleeding)
  • Stroke
  • Trauma
  • Stroke
Treatment
  • Administer 30ml/kg crystalloid bolus for hypotension.
    • SBP <90, MAP <65, or >40 pt decrease form last normal SBP.
    • Crystalloids = NS, LR, 5% Dextrose.
  • Vasopressors (for hypotension that does not respond to initial fluid resuscitation).