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

CCU   (9,828 Views 9 Comments)
by loftay13 loftay13 (New Member) New Member

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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?

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llg has 40 years experience as a PhD, RN and specializes in Nursing Professional Development.

5 Followers; 57,967 Visitors; 13,047 Posts

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.

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donnasRN has 3 years experience.

1,705 Visitors; 74 Posts

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

Sent from my iPhone using allnurses.com

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8,042 Visitors; 496 Posts

MAP > 60 or 65 would help indicate adequate perfusion. Diastole is a filling pressure;

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lilpetRN has 14 years experience and specializes in Cardiac.

875 Visitors; 7 Posts

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.

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NotReady4PrimeTime has 25 years experience as a RN and specializes in NICU, PICU, PCVICU and peds oncology.

16 Articles; 71,275 Visitors; 7,355 Posts

Coronary perfusion occurs in diastole. One requires a certain amount of pressure to adequately perfuse the myocardium, but 50 is usually enough.

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RN-LOGIC specializes in CTICU.

4,194 Visitors; 66 Posts

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.

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Bronx1560 has 17 years experience and specializes in ICU (hearts,trauma,NICU, PICU, ER).

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Agree with my fellow nurses MAP

I remember when i was in my critical care course (no going to tell you how long ago :p) i was taught MAP >65 is all organs perfused , MAP 60 is brain only & MAP

Hope this helps :)

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