O2 Toxcity

[Guest guest]

Ian

Re Below, many thanks, I only read your post after I sent the last one,

The in chamber treatment you gave is exactly what I was taught on my DMT

course. But as you say the Rx could well be different " at scene " your

explanation makes a lot more sense that a lot of stuff I've read this

afternoon, why can't more people write in English !!

I think that will have pretty much answered Deans question,

Many Thanks

Ian S.

The military have written up a case of pulmonary barotrauma (PBT) from just

one metre of ascent so again I would be hard pushed to separate a PBT from

CNS O2 hit in the unconscious, convulsing diver, and would use O2 at the

surface. CNS O2 tox does not occur at 1ATA, (unless the pt/diver are taking

drugs that compete with the body's ability to cope with the 'free radicals'

(chemicals) that oxygen causes the body to release normally). Not too many

of these types are fit enough to dive though. It is these free radicals

that

cause the O2 hit, they are produced usually at >1ATA, the 'new' oxygen at

the

surface is unlikely to contribute to the manufacture of new free radicals.

O2 hits within the hyperbaric chamber are about 1:10,000 treatments and I

have seen 3, & dealt with 2, it is a different environment the PO2 is around

2.8ATA and the patient / diver is at rest. The hit subsides usually within

30 ~ 60 secs, if we are still within an O2 period then we would wait for 15

mins (breathing air) and put the diver back on O2, this can be repeated up

to

3 times.

__________________________________________

Ian Sharpe

International SOS Paramedic

AGIP Kco Marine Supply Base

Bautino, Republic of Kazakhstan

Tel: +31 70 313 3655 / 3690 (Clinic/ Accommodation)

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