It really sucks that this guy passed away. I'm sorry for his family and their loss. It sounds callous, but the truth is, he was going to die from something, it just happened to be diving.
Alot of interesting comments here - we all strive for closure and answers, which often causes us to point fingers, even if unwarranted.
Some brief observations/potential take home points:
1. The article is written based on the case as presented by the wife - so it is clearly biased in that direction, certainly many facts are missing. We owe it to all parties to withhold judgment and opinions until more data is provided. We don't even have half of the story yet.
2. I'm a doctor (the kind that went to medical school and writes prescriptions). I dive. I have a form of asthma. I read a lot about the science and physiology of diving. I WON'T SIGN ANY MEDICAL RELEASE FOR DIVING because I don't feel qualified to do so. Most physicians ate not qualified to fill out SCUBA release forms.
NOTE: I get asked to fill out release forms alot for all kinds of things. A few weeks ago a patient asked me to fill out some form for work. It was 23 pages long. Seriously. I told her no. I told her I can't spend the time to do that. It's unfair to me and my real patients to waste time on some form that some office manager deems necessary. That's immoral. It's also immoral to expect a non-diving specialist to be qualified to sign a release. I'm not talking about a doctor who dives, I'm talking about a doctor that specializes in dive medicine.
3. If there is a "YES" on any medical question, the doctor, student, and dive shop should, IMHO, call a DAN physician and discuss it with him/her.
4. The article mentions the pathologist's comments about the cause of death. No one can really say the SCUBA caused the death, it is simply associated with SCUBA. on the death certificate, you fill out the cause of death, then diseases the patient had that MAY have contributed to the death. Here you put any known illnesses. Asthma, cardiomyopathy, hypertension are easy ones - but are not the cause of death. I see nothing in the article that leads me to believe that asthma played a direct role in the unfortunate death of this person.
5. The NCBI article on asthma and diving published in hyperbaric medicine (above) is an interesting read if for no other reason than its giving fodder for discussion about clinical relevance. 24 subjects is essentially meaningless. They note statistical differences. That is a mathematical term. The real question we need answered is "SO WHAT?" Meaning, does this actually affect me when diving? The article clearly fails to prove that.
6. I solo dive. I ride and race motorcycles. I rock climb. I do plenty of stupid things (I'm not saying any of the above are stupid). I am going to die. I see people die all the time-sometimes as a direct result from decisions they've made, sometimes as complete accidents. When I do die, I hope my wife is grounded deeply enough to accept it peacefully instead of trying to place blame in a shallow attempt to find purpose in death.
7. None of us are qualified to sort this case out beyond individually deciding how we are going to dive better/live better.