ATRIAL FLUTTER   สาเหตุ     Right or left atrial enlargment     Sinus node dysfunction     Electrolyte abnormality, hypoxia, hypoglycemia การรักษา     Acute treatment         DC electrical cardioversion         Overdrive atrial pacing with electrode catheter         Intravenous digoxin         If digitalized, give IV amiodarone or IV procainamide     Chronic treatment         If patient still has atrial flutter while receiving digoxin, propranolol, amiodarone or quinidine may be added (propranolol and quinidine are contraindicated in sick sinus syndrome)