Of course this recommendation is for professional divers who are paid extra to dive and are typically in excellent physical condition.
The time period should be doubled for most recreational divers and a thorough medical evaluation prior to a return to diving is recommended. Diving more conservative profiles is a valid recommendation for the future and in cases of serious DCS or AGE without a provocative dive profile, the diver should consider being evaluated for a patent foramen ovale. While very minor symptoms of DCS may go away with just rest and over the counter pain medications, it is thought that treatment with recompression and oxygen is ideal to prevent any possible long term effects from the injury.
For cases of severe DCS, recompression therapy using hyperbaric oxygen is critical and should not be delayed. Many clinical studies have demonstrated that a delay prior to treatment results in the need for more aggressive therapy and increases the chances of having incomplete resolution of symptoms. Treatment of decompression sickness with hyperbaric oxygen HBO has few associated risks but is both time and labor intensive. Because of this, physicians who treat divers have a low threshold for initiating treatment.
Distinguishing between pain due to trauma during the dive and pain from mild DCS can be very difficult. The bends is the common euphemism for what is technically called either decompression sickness, or barotrauma Baro meaning related to pressure.
The bends are the condition that arises when there is a rapid decrease in the pressure around you, so it can happen in either air or water. A diver breathing underwater is taking breaths of compressed air. With the increased pressure of going deeper underwater, the further down you dive the more air particles you take in. Thus, the deeper you dive the more nitrogen particles the body absorbs. A long, deep dive will store nitrogen in the body tissues that have a tendency to release as the pressure lowers.
An analogy to a soda can is always made here. A soda can is a pressurized environment. When you open the can, the pressure suddenly lowers, and this causes the pressurized gas to release and it causes the bubbles. If you open a bottle very, very slowly the pressure release is slow and the reaction is far less severe. That analogy, that of opening a bottle slowly, is similar to a scuba diver ascending slowly to alleviate the condition.
As a diver comes from the sea depths at pressure decompressing , and moves towards atmospheric pressure at the surface, those nitrogen molecules will leave the body tissue. A diver will breath deeply as he slowly ascends so that as the pressure decreases the nitrogen will slowly leave the body.
Should the diver ascend too quickly, the nitrogen has not had time to escape, and nitrogen bubbles form in the body joints and tissues. The precursor situation to the bends is naturally fine. The danger comes from a rapid release of pressure, either the diver ascending too quickly, or the soda can being opened quickly.
As the water pressure lowers on ascent the nitrogen bubbles come out and form gas bubbles within the body. Could I be a shark's next meal?
It's not a silly question. Whether or not you learn to dive depends mainly upon how severely affected you are by your fears of being harmed by some big fish or predator. If you cannot get these thoughts out of your mind while diving, then you may not be able to do the many tasks that you're expected to during a dive. We become visitors in the ocean when we dive for very brief intervals. The fish live there all the time and it is their world.
Very few of these creatures pay us any attention whatsoever, and if they do, it is usually to get out of our way. Shark attacks on divers are very rare. In fact, for the year period from to , DAN reported no deaths from shark attacks in its annual report on diving fatalities. My doctor says that after age 50 you should restrict your maximum diving depth to 40 feet.
He said there is a place in the base of your brain that retains some pockets of air that can affect your brain. I dive regularly and I am It's not true.
There are no air bubbles at the base of the brain, and diving after 50 years of age requires no depth restriction to 40 feet. There is some indication that as we age we are more prone to a decompression accident, but this requires only a sensible reduction in depth and time at depth, with conservative ascents and safety stops. Two years ago I was diagnosed with hairy cell leukemia. Since treatment, my blood counts have been normal.
I feel great and was diving before this was diagnosed, with no problems. Is there any reason for me not to be diving now? Congratulations on having had a great response to treatment. You should seek a physician knowledgeable about dive medicine to recertify you as fit for diving.
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