ALL equations for Mean Arterial Pressure??

[jhill134]

I'm trying to figure out how the MAP on my monitors are calculated, it's not the shorthand, weighted average approach: (SYS + 2 DIA)/3

I'm guessing it involves HR...maybe pulse pressure. I really can't figure out otherwise.

Thanks!

[Wuzzie]

It's because the monitors calculate the MAP and THEN extrapolate the systolic/diastolic using proprietary calculations not based on what we use when doing manual pressures. Automatic cuffs do it by measuring oscillation to determine the MAP while direct-measure devices (a-lines) measure the wave form. Blew my mind when I found this out.

[Oh'Ello, BSN, RN]

It's because the monitors calculate the MAP and THEN extrapolate the systolic/diastolic using proprietary calculations not based on what we use when doing manual pressures. Automatic cuffs do it by measuring oscillation to determine the MAP while direct-measure devices (a-lines) measure the wave form. Blew my mind when I found this out.

Which is why sometimes (at least on our monitors) you can have a crappy wave form and -/- for sys/dia but still have a map in parentheses that makes sense

[Cowboyardee]

Which is why sometimes (at least on our monitors) you can have a crappy wave form and -/- for sys/dia but still have a map in parentheses that makes sense

Actually, i believe wuzzie was talking about a MAP. resulting from a cuff pressure. BP cuffs from the monitor dont 'listen' for systolic and diastolic sounds like a person does, but is instead an oscillatory pressure - measuring the mean pressure directly amd then using that to calculate systolic and diastolic numbers via some formula.

I believe that the MAP calculated from an arterial line is still based on the waveform, crappy waveform or not. Specifically it is related to the area under the waveform.