known issue heart valves severe chronic obstructive pulmonary disease copd experiencing shortness breath difficulty breathing significant way feel slightly dizzy lightheaded known heart defect feel heart beating fast racing irregularly missing beat feel palpitations feel heart beating irregularly disorganized pattern traveled country last 4 weeks
atrial fibrillation psvt pulmonary embolism anemia guillain-barré syndrome scombroid food poisoning acute dystonic reactions myasthenia gravis anaphylaxis myocarditis sle possible nstemi / stemi chagas
Atrial fibrillation