Habib R Khan1, Matloob A Shajar2, Surendra K Naik3. 1. Department of Cardiology, University Hospital NHS Trust, Nottingham, United Kingdom. 2. Department of Cardiac Anaesthesiology, Nottingham University Hospital NHS Trust, Nottingham, United Kingdom. 3. Department of Cardiac Surgery, Nottingham University Hospital NHS Trust, Nottingham, United Kingdom.