I am disabled and in a wheelchair and cannot stand or walk at all. I recently went to my GP with breathlessness and mild chest pain when transferring from chair to to other support, and I have been told I have a heart murmur by the consultant at the cardio dept of the local county hospital. He has made an appointment for me to have an angiogram (catheter) yet this hospital has a less invasive procedure called a CT Angiography which is not risky. Can I tell them I don't want the invasive procedure and ask to have the less invasive CT Angiography? What reasons could they have for sending me for the more invasive procedure, which to be honest, scares the life out of me?