Hey there! Sign in to join this conversationNew here? Join for free

Cerebral blood flow and arterial partial pressure of oxygen? Watch

    • Thread Starter
    Offline

    1
    ReputationRep:
    Is this correct..' as cerebral blood flow decreases, the arterial partial pressure of oxygen increases?'
    And can anyone explain why this is the case?
    Offline

    19
    ReputationRep:
    (Original post by MedStudentt)
    Is this correct..' as cerebral blood flow decreases, the arterial partial pressure of oxygen increases?'
    And can anyone explain why this is the case?
    It's the other way around. Cerebral blood flow is dependent on arterial oxygen partial pressure, not vice versa. CBF stays pretty constant for a wide range of PaO2, but when PaO2 decreases below a critical level (6.7kPa) then blood flow starts to increase to try to maintain oxygen delivery. This is why maintaining a decent PaO2 is important in management of head injury etc, to avoid rises in CBF which would raise intra-cranial pressure.
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by Helenia)
    It's the other way around. Cerebral blood flow is dependent on arterial oxygen partial pressure, not vice versa. CBF stays pretty constant for a wide range of PaO2, but when PaO2 decreases below a critical level (6.7kPa) then blood flow starts to increase to try to maintain oxygen delivery. This is why maintaining a decent PaO2 is important in management of head injury etc, to avoid rises in CBF which would raise intra-cranial pressure.
    Thank you so much!
 
 
 
Reply
Submit reply
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Updated: February 4, 2017
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.