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DIVE SAFETY
These articles are reprinted with Dan's permission. Check out the Dan site for more Safety articles, tips, information on Dive Injury Insurance Plans and Travel Assist Benefits.
Medical Fitness & Diving
As scuba diving's appeal broadens to all ages, more individuals with some type of health concern are asking about fitness requirements for scuba diving. Many years ago, when physicians trained in diving medicine began discussing recreational scuba fitness requirements, a "model diver" was created.
This model diver was the accumulation of medical expertise, diving physiology and known disease processes. Restrictions to scuba diving include medical conditions and illnesses that might impair or limit a diver's ability to perform underwater.
Unfortunately, very little research data existed to support many of these theoretical restrictions to scuba diving. Now, as it was then, it would be unethical to place individuals at risk of injury just to prove actual risk is less than what we might expect.
Some restrictions have changed over the years, however. For example, 10 years ago, the fear of hypoglycaemia kept any person taking medication for diabetes out of scuba diving. Today, individuals who control their diabetes with oral medication may dive; and perhaps, once DAN's research on diving with diabetes is completed, the scuba training agencies may accept a select group of insulin-requiring persons with diabetes.
There are still prospective and current divers who are going to be advised against diving because of a medical condition, not just because they have a medical problem but because of the severity of their symptoms. In general, any condition that may impair mental or physical performance, induce pain or loss of consciousness, or cause nausea or vomiting must be evaluated before diving. Additionally, there are some medical conditions that may be affected by diving physiology, such as some blood disorders which are sensitive to changes in blood volume.
This site presents some questions that concern chronic and long term illness, as well as short term illness and injury. DAN physicians and others have put together some answers to help explain these medical concerns to divers and their physicians so that, together, they can make an informed decision about scuba diving.
This is one way that we at DAN strive to increase general medical knowledge in the scuba diving community and prevent injuries and deaths related to these medical conditons.
Joel Dovenbarger
Director DAN America Medical Services
Flying After Diving
Flying (or otherwise ascending) to a higher altitude after having dived can predispose a diver to decompression illness unless there has been sufficient surface interval to allow excess gas to diffuse from the body. If insufficient time has been allowed and the ambient pressure is reduced, gas bubbles may form, or existing asymptomatic bubbles may increase in size and cause symptoms of decompression illness.
We can never be sure exactly when it becomes "safe to fly" after a dive since it will depend on the degree of bubble formation and how long it persists.
Many authorities recommend that, as a general rule, a diver should wait at least 24 hours before flying after an air dive. Sometimes this may be overly conservative, while on other occasions, it may not prove to be conservative enough.
Reprinted from The DAN Emergency Handbook.
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