I checked this out with my doctor, and she checked it out with a heart specialist here and both agreed, given a situation as described it is probably the best help you have when we first published it back in 2000. My concern in publishing it was as I said at the bottom, we had a friend in Wilsall MT who died fishing his favorite stream. Found the next day leaning against a tree. Johnny was known to have a heart problem.
I've been fishing in a lot of places where I could not take nor get an aspirin and my cell phone (which would have been in the car) would not have brought me any help if they could find me, and there probably wouldn't be any reception out there anyway.
I choose to remember how to do it - it could save MY life.