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To: shelps@ac*.ma*.ad*.ed*.au* (Prime Rat)
Subject: Re: bubble trapping, (was Australian O2 protcol.)
From: story@be*.en*.sg*.co* (David Story)
Cc: techdiver@opal.com
Cc: ddoolett@ac*.ma*.ad*.ed*.au*
Date: Wed, 28 Dec 1994 14:46:38 -0800 (PST)

Prime Rat writes:
> 
:
> Blocking of brain arterioles or capillaries by bubbles produced during 
> decompression or directly injected into the arterial circulation is only 
> seen when the heart stops beating, ie (as is well known) after death.  If we 
> perform a craniotomy on a rabbit and produce intra-artial bubbling by 
> decompression or direct injection of air into the arterial circulation the 
> bubbles are seen to pass though the artioles and disappear.  They can in 
> fact, be detected in the saggital sinus (using ultrasonic Doppler) exiting 
> the brain vascular bed.  Conclusion?  Bubbles do not block the capillaries.  

Can you provide a little more detail here.  I'm not clear after
several readings of this how you conclude that bubbles do not block
the capillaries.  

If they don't block the capillaries, what do they block?  Why wouldn't
they block the capillaries, if they block the lungs?  (Later in this
message, you say "...the lungs can fill up [with bubbles]") Perhaps
brain capillaries behave differently than other capillaries?

I found the rest of this message quite informative and useful, thanks
very much for writing it!

Cheers,

David Story                        NAUI AI Z9588, PADI DM 43922, EMT
story@be*.wp*.sg*.co*		  Every dive is a decompression dive.

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