All divers should consider carrying a few 325mg. asprins,,,,,in the event they are dealing with a possible heart attack diver they can have the diver chew 1 asprin followed by some water......this goes along way to helping blood clots from forming and gives the diver a bit more time to get medical treatment from EMS and hospital staff. I go as far as carry several in a small waterproof pill bottle attached to my BCD via a small carabineer...this way I can even provide the diver the opp. to take the asprin sooner (sooner the better). Dan reports that many of the dive fatalities reported are contributed to heart attacks and cardiac arrest.