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To: Richard
To: Pyle <deepreef@bi*.bi*.ha*.or*>
Subject: Re: some CO2 and hemo info
From: shelps@ac*.ma*.ad*.ed*.au* (Prime Rat)
Cc: techdiver@opal.com
Date: Thu, 5 May 1994 09:57:09 +0930

>What effect does hyperoxic concentrations in the blood have on restriction
>of bloodflow?  I understand oxygen is a vasoconstrictor - shouldn't
>excessively elevated dissolved PPO2 result in constricted perhipheral
>vessels & consequently a build-up in CO2? 

Except that CO2 is a vasodilator so you get into a hyperoxia=vasoconstriction
hypercarbia=vasodilation cycle keeping blood flow at some satisfactory 
level.  Also remeber that maximally constricted blood vessels are not going 
to stop the flow of blood.

/Rat


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
shelps@ac*.ma*.ad*.ed*.au*         Stephen Helps
FAX   (08)232-3283                      Anaesthesia & Intensive Care
Voice (08)224-5495                      University of Adelaide
                                        ADELAIDE, 5005, South Australia
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If there is a 50-50 chance that something can go wrong, then 9
times out of ten it will. (Paul Harvey News, 1979) 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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