Risk factors for developing heart attacks or coronary artery disease include smoking, diabetes, high blood pressure, high cholesterol, and a family history of coronary disease or heart attacks. If you have weakened heart muscle from whatever cause, you would experience exertional shortness of breath, fatigue, lower leg swelling, and sometimes, chest pain. The symptoms of a rapid heartbeat could be due to a rhythm disturbance in weakened heart muscle but that would have to be proved by capturing the heart rhythm on a heart monitor which could be worn portably. If you feel that your initial medical evaluation wasn't thorough enough, then you should consider going to an adult cardiologist for a reevaluation. I hope you find this information useful and please write back.
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