Mailing List Archive Mailing List Archive
I have an interesting story that may relate to the current CO2 discussion. But first, an introduction. Iam a graduate student at U of Hawaii studying Marine Biology and a friend of Rich Pyle. Under his mentorship I have safely built up to 200 ft air diving and some nitrox, but nothing else, though I am definitely interested. The story is about a dive to 180 ft on air that I performed with not much deep experience (this was before I started diving with Rich). As I went over the side of the boat I droped my hand net and, not wanting to lose it, I decended very quickly. As I reached bottom and shifted from head-down to head-up, I was overcome by strong 'cold' narcosis (tunnel vision, paranoia,no sense of time passage). Not until I ascended to 60 ft did the symptoms go away. I told the University's Diving Safety Officer about this and he thought it was due to what he called 'blood pooling'. As I was decending head down and kicking strongly, the blood vessels in my head constricted to ensure an adequate blood supply to my legs. When I went head-up the combination of constricted vessels and gravity caused a low blood pressure condition in my head, causing (along with the depth) the extreme narcosis. Does this sound reasonable or has anyone else heard of it? It sounded plausable but I am not that knowledgable about physiology. Jeff
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]