Dear papaley,
Ascities (collection of fluid in the abdomen) may be due to cardiac problems but more commonly is due to liver disease. Have you been checked for this? If not talk to your doctor about getting some liver studies. If he has determined that there is no other cause and this is due to your heart then the best treatment is with medications. You may need an increased dosage of medication or additional meds to get the problem under control. Also limiting your fluid and salt intake will help.