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To: techdiver@opal.com
Subject: RE: IWR and O2
From: J Shepherd <jms@fe*.ed*.ac*.uk*>
Date: Fri, 9 Dec 94 15:17:20 GMT
	What Iain said, plus;

	Recompression treatment isn't just squeezing. The diagnosis and
correct schedule are important. You swop 25mins on, 5mins off at 1bar
O2, but what about 1.6 bar O2? Can you swop under water?

	How much improvement is there likely to be in the time available
(typically less than 30mins of O2 in a kit at 1bar)? One poster has
mentioned 138 mins, but the bends that have occurred close to me have
been 4 to 6 hours at 2.6 bar O2 in a chamber (later compressions being
deeper and longer and usually not leading to complete relief of symptoms
:-( ).

	Also, the schedules are shaped, just as a dive is. A descent, a
pause, and an ascent. All these factors have to be included in your
rapid hopover the side of a boat!!

	IMHO IWR is going to be useful only if the chamber is four hours
plus away, *and* you have someone capable of acting as a chamber
attendant and doctor, who can plan and execute recompression treatment.

	(NB, useful as a regular treatment advisable to most divers, as
opposed to the anecdotal reports of success that turn up).

	O2, treatment for shock and hysteria and correct radio drill -
followed by not fucking up when the chopper arrives; that gets my vote.
Once in trouble, steer clear of the water... it just complicates things.

	Jason. Cold. As opposed to hot. Lucky B******d. ;-)

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