RE: [PSUBS-MAILIST] Perry lockout

In diving and other hyperbaric scenarios there are two types of oxygen poisoning that can occur. The first, more common, is a result of high O₂ partial pressure at depth and results in aberrations of the body’s chemistry causing neurological difficulties (convulsions being the worse and can result in death rapidly). The other results from breathing O₂ at high concentrations at low pressure for a long time. The high O₂ irritates the lungs resulting in fluid build-up (potential for pneumonia). This is why patients on O₂ are taken off for short periods after 48 or 72 hr. exposures (if I remember the timeframes correctly). This is the limiting factor for underwater habitats in shallow water breathing straight air (Jules’ Underwater Habitat in ~33 fsw is limited to 72 hour stays). An early symptom of this is a tightness in the chest.

Dr. Bill Hamilton developed an inexact formula for keeping track of O₂ exposures at pressure as a guide. It is inexact as each person reacts differently to high O₂ exposures day to day.

R/J²

Respectfully,

Jay K. Jeffries

Andros Is., Bahamas

It is the mark of an educated mind to be able to entertain a thought without accepting it.
- Aristotle

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph Perkel
Sent: Sunday, January 28, 2007 11:28 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Perry lockout

Here is a link regarding 02 toxicity as applicable here. http://scuba-doc.com/o2tox.htm

I see the effects of 02 toxicity frequently in the ICU, (chronic obstructive pulmonary patients)...not a pretty picture. Different route of getting there but, same symptomatology.

Joe

From: Subscuba@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Perry lockout
Date: Sun, 28 Jan 2007 10:40:27 EST

For what it's worth,

I had a close friend that got badly bent with a CNS hit. He was treated in a Hyperbaric chamber to 99 ft (pure O2) for 25 times. He should have been treated by Table 6 in a decent re compression chamber.He still has problems after 10 years.

I don't recommend a Hyperbaric chamber.

Ken Martindale