the results of a ekg last week,( 12 lead ) indicated- marked sinus bradychardia , as well as borederline rythym. I am 62 male, work out 3 times a week for 1.5 hours wk. and am asymptomatic of any cardio related problems. following data: rate 48, pr194, qt472/452msec,qrsd92msec,p axis52,qrs axis29, &t axis49; am very healthy w/no medical problems. should i be concerned?