I spoke to my dad last night. On Thursday (16th) he went in for a check-up and his heart is back to an irregular heartbeat. He is on medication now (Chemical cardioversion) and will have another check-up in two weeks and if that doesn't work he may have another Electrical cardioversion.
You can read about his Electrical cardioversion here that he had on January 19th. Also this link tells about the cardioversion and atrial fibrillation.
Appreciate your prayers for him! Again you can also read my orginal post in October on what kind of heart he has. Thanks. You can also email him. He has never been on-line himself but my mom will print them out for him.