Question

How do you calculate MAP?

How do you calculate it when you are given CO and SVR?
And if you are given CVP?
a) MAP = (SBP + 2 * DBP) / 3; MAP = (CO * SVR) / 80; MAP = CVP + SVR
b) MAP = (SBP + DBP) / 2; MAP = CO / SVR; MAP = (CVP * SVR) / 100
c) MAP = (SBP + DBP) / 3; MAP = (CO / SVR) * 80; MAP = CVP + SVR
d) MAP = SBP - DBP; MAP = CO * SVR; MAP = CVP / SVR

Answer 1

MAP is calculated as DBP + (SBP - DBP) / 3 or CO × SVR + CVP. The correct formulas from the options provided are MAP = (SBP + 2 × DBP) / 3 when using blood pressure readings and MAP = (CO × SVR) + CVP when given CO, SVR, and CVP.

Step-by-step explanation:

Mean arterial pressure (MAP) is a crucial measurement in understanding the average blood pressure in a person's arteries during one cardiac cycle. The most common method to approximate MAP is by adding the diastolic blood pressure (DBP) to one-third of the pulse pressure. Pulse pressure is calculated as the difference between systolic blood pressure (SBP) and DBP. Therefore, the formula is: MAP = DBP + (SBP - DBP) / 3.

When given cardiac output (CO) and systemic vascular resistance (SVR), MAP can be calculated using the formula MAP = CO × SVR + central venous pressure (CVP). However, if CVP is not given, it is often assumed to be negligible, and the equation simplifies to MAP = CO × SVR.

The correct formula from the provided options is: MAP = (SBP + 2 × DBP) / 3 when using blood pressure readings; MAP = (CO × SVR) + CVP when incorporating CO, SVR, and CVP.