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That sounds very familiar to an experience I had many years ago. I was feeling some uncomfortable tightness in my chest and insisted to my folks that someone take me down to the local hospital to be checked. Fortunately, it was not cardiac arrest because I would have been dead by the time they got around to taking a better look at me. Actually, after laying in the room for two hours, someone came along and I asked to be released. The nearest guess I have is that I was carrying a pair of rather large network bridges earlier in the day and that I pulled some big shoulder muscles.