I don't think exercises can be used as receipies for particular conditions. There is no exercise for AF. The question you should be asking yourself is what is the patient's problem?

Treatment/exercise should be based on what the problem is... if he's got AF... i'm sure the patient probably has an array of heart problems. Depending on the level of mobility/function of the patient... do exercises which will strengthen the heart and improve blood circulation. Eg... walking... cycling... or maybe bed exercises if the patient is bed ridden.