Hi there. I have breast cancer and atrial fibrillation but didn't have chemo. I had targeted radiotherapy instead. Have you spoken to  your healthcare team about the eratic heartbeat? I would advise that you do and they can give you proper advice about it as they would have your medical notes. Good luck with the chemo tomorrow. Gill xx

Thanks Gill. It's the steroids that are causing it this eve i think, according to arrhythmia nurse I should  just up the fluids. I'll def ask tomorrow x