diagnosed hyperthyroidism known issue heart valves severe chronic obstructive pulmonary disease copd experiencing shortness breath difficulty breathing significant way high blood pressure take medications treat high blood pressure feel heart beating fast racing irregularly missing beat feel palpitations feel heart beating irregularly disorganized pattern traveled country last 4 weeks symptoms increased physical exertion alleviated rest
atrial fibrillation psvt guillain-barré syndrome panic attack myocarditis scombroid food poisoning acute dystonic reactions myasthenia gravis anaphylaxis sle chagas
Atrial fibrillation