Chemo drugs can effect your heart. I have been having issues controlling my BP during treatment, Avasitian was the worst, but I've been off it for 5 months now, and my numbers are just getting back into a good range with meds. I also had issues with high Triglycerides and cholesterol when I was on Afinitor, but after I was off the the drug for about 3 months my numbers were perfect. My suggestion is that you ask your oncology team for a referral to a good cardiologist, I have been seeing one since Jan 2011, to monitor your condition.
I had a MUGA hear scan in Aug 2009 before I started treatment for advanced Kidney cancer. I have had EKGs once or twice a year since then. Though everything "sounds" fine and my numbers are getting better, I will be having an echo cardiogram this coming Wed (5/8) just to be on the safe side.