(also coronary angiogram, cardiac catheterisation)
This is a special x ray test to actually take pictures of the arteries of the heart. It is a very safe test and is performed under local anaesthetic. A tiny tube is passed to the heart via an artery in either the leg or wrist and moving x-ray pictures recorded as a special dye is injected into the arteries. This gives us a road map of the arteries and shows up any blockages or narrowings. During this test the valves, pumping function and oxygen levels in the heart can also be assessed.
Remember this is an investigation not a treatment which is why it is much cheaper than angioplasty and stent insertion.
Fractional Flow Reserve Assessment (FFR)
If a narrowing is identified in a coronary artery it is no always clear if it is important and needs fixing or not. FFR uses a fine wire to measure the change in pressure either side of the narrowing to determine whether or not a stent should be placed. In order to measure the pressure accurately you will be given a drug called adenosine. For this reason you will be advised not to drink tea or coffee on the morning of the procedure as caffeine interferes with adenosine.
Optical Coherence Tomography (OCT)
This is similar to IVUS but uses light instead of ultrasound to achieve its images. it is a new technique which is being increasingly used as its pictures are far more detailed than those achieved with IVUS. As with IVUS it provides information regarding shape and size of arteries but also amount and type of fat build up.