What MAP Meanings Do Circulatory Changes Bring?
Changes in the factors affecting blood circulation mentioned above can bring about different implications to MAP and how organs are perfused.
Mean arterial pressure meanings are significant to doctors, nurses and health workers who are involved in monitoring a patient's physical status and his response to therapy especially in critical situations.
Normal MAP is at 70-110 mm Hg, where adequate blood supply reaches the vital organs to deliver enough oxygen and nutrients. A significant decrease in MAP therefore results in a deprivation of this supply and can cause organ damage and death, when the condition is prolonged.
An increase in heart rate, as in exercise and emotional states can bring the MAP closer to the arithmetic mean of the systolic and diastolic pressures; vascular resistance usually decreases proportionately. Small and temporary changes do not result in significant consequences because compensatory changes in the circulatory system for adaptation occur. This is often referred to as autoregulation.
However, sudden and prolonged changes like a significant blood loss during trauma can dramatically decrease systolic pressure and bring down MAP to a degree that blood supply to the organs is compromised. If not stopped or replaced, blood loss can result in hypotension (decreased blood pressure) which can result in death.
Other causes of decreases in blood pressure like a massive heart attack can bring about a significant decrease in cardiac output and MAP, preventing perfusion of the brain and kidneys, also leading to organ damage. Certain drugs can also affect blood pressure, heart rate and cardiac output, so that monitoring responses to therapy should be done to ensure that MAP is adequately maintained.
In summary, changes in the circulation can affect mean arterial pressure which could mean perfusion pressure compromise, or adverse effects in the delivery of oxygen and food to the vital organs.