is MAP or diastolic BP below 60 that means tissues are not perfused?

  1. Hi, I'm a newly qualified nurse and this may seem a silly question but I'm a little confused. I was taught throughout my training that if the mean arterial pressure is below 60 then the tissues are not perfusing adequately but today I was told by a collegue that it is when the diastolic is below 60. Which is correct?
  2. 8 Comments

  3. by   llg
    My dialostolic BP is often below 60 -- and my doctor and I consider that a good thing. There is nothing wrong with that. Your colleague is wrong.
  4. by   loftay13
    Thankyou :-)
  5. by   donnasRN
    No your colleague is wrong, a MAP below 60 means decreased perfusion, not the diastole. They're confusing the two. Think of this way, if a pt has a BP of 90/50, his MAP = 63. Point proven your colleague is incorrect

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  6. by   dah doh
    MAP > 60 or 65 would help indicate adequate perfusion. Diastole is a filling pressure; < 60 can be ok.
  7. by   lilpetRN
    Yep MAP needs to be above 60 for adequate perfusion to the body. On our unit we pay very little attention to the B/P numbers and focus more on the MAP. I have had several nephro docs tell me though that the MAP needs to be 70 or better for adequate perfusion to the kidneys.
  8. by   NotReady4PrimeTime
    Coronary perfusion occurs in diastole. One requires a certain amount of pressure to adequately perfuse the myocardium, but 50 is usually enough.
  9. by   RN-LOGIC
    Typically a map above 60 is adequate perfusion. However, when dealing with hemodynamically compromise patients a map of 80 , just to say a number may not reflect an adequate body perfusion. A map can be affected by many variants.
  10. by   Bronx1560
    Agree with my fellow nurses MAP <60 is decrease perfusion to all your major organs. Remember the correlation between your aline pressures to get your MAP. Diastolic <60 can cause your MAP to drop.

    I remember when i was in my critical care course (no going to tell you how long ago ) i was taught MAP >65 is all organs perfused , MAP 60 is brain only & MAP < 60 nothing perfusing.

    Hope this helps