Arteriovenous Malformations??

I have a question...I had a patient last week and I was reading in his chart he had 6 arteriovenous malformation that were oozing. They were found by an upper endoscopy then injected with epi and cauderized. I am basically shadowing the nurse and didn't ask a whole lot of questions about this specific patient and was just curious if anyone knew anything about this. The pt was an 84 yo newly diagnosed w/CHF history of anemia, RUQ pain, chronic GI blood loss, CAD, MI, abd. aortic aneurysm, DM 2, PVD and a whole lot more......a lot going on with him. But I am trying to write a paper on him and tie it all together. The chronic GI blood loss was this due to the AVM's you think? Do the AVM's cause any other symtoms? I googled it an read that most are asymptomatic. Also the RUQ pain what usually causes that? The anemia is from the blood loss most likely. And an aortic aneurysm...is that operated on if it is asymptomatic?? I know its a lot of questions. But anything someone with experience has to offer I would greatly appreciate it. Thank you!!