Objective To investigate the effectiveness and safety of various agents on paroxysmal atrial fibrillation in the elderly over 75 years old.Methods Totally 264 in-patients （75-91 years old

185 males and 79 females） with atrial fibrillation history of less than 7 days were enrolled in this study.A total of 611 atrial fibrillation episodes were recorded

but 130 episodes （22.3%） of atrial fibrillation were auto-converted to sinus rhythm.The rest 481 episodes of atrial fibrillation were divided into six groups based on the drug used.Results The cardioversion ratio of atrial fibrillation were 9.5%

46.9%

71.7%

55.9%

32.7%

and 73.6% in control

cedilanid

amiodarone

propafenone

verapamil

and quinidine groups

respectively.Ventricular rate control were 5.4%

83.6%

84.9%

77.9%

78.8%

and 11.3% in those groups

respectively.The total effective rates of amiodarone and cedilanid groups were the highest. When the ventricular rate was controlled to below 90 bpm

the patients would almost complain of no discomfort. No severe side-effect was observed in each group.Conclusion Amiodarone and cedilanid may be the proper drugs for the treatment of paroxysmal atrial fibrillation in the elderly.The above antiarrhythmics in each therapeutic group were relatively safe and effective.