ALL equations for Mean Arterial Pressure??

  1. 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!
    •  
  2. Visit jhill134 profile page

    About jhill134

    Joined: Sep '16; Posts: 4; Likes: 2

    3 Comments

  3. by   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.
  4. by   Oh'Ello
    Quote from 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.
    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
  5. by   Cowboyardee
    Quote from Oh'Ello
    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.

close