The Mean Arterial Press calculator compute the mean arterial pressure based on the diastolic pressure and the pulse pressure.
INSTRUCTIONS: Choose units and enter the following:
- (DP) Diastolic Pressure
- (PP) Pulse Pressure
Mean Arterial Pressure (MAP): The pressure is returned in millimeters of mercury (mmHg). However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The Mean Arterial Pressure (MAP) is a term used in medicine to describe an average blood pressure in an individual. It is defined as the average arterial pressure during a single cardiac cycle.
MAP = DP+(1/3)*PP
Where:
- MAP=Mean Arterial Pressure
- DP=Diastolic Pressure
- PP=Pulse Pressure
MAP is considered to be the perfusion pressure seen by organs in the body. It is believed that a MAP that is greater than 60 mmHg is enough to sustain the organs of the average person. MAP is normally between 70 to 110 mmHg If the MAP falls below this number for an appreciable time, vital organs will not get enough Oxygen perfusion, and will become ischemic.
In other words:
Total Peripheral Resistance = (Mean Arterial Pressure - Mean Venous Pressure) / Cardiac Output
Therefore, Mean arterial pressure can also be determined from:
MAP = `("CO" * "SVR") + "CVP"`
where:
CO is cardiac output
SVR is systemic vascular resistance
CVP is central venous pressure and usually small enough to be neglected in this formula.