V Sawhney1, N Campbell2. 1. Department of Cardiology, 1st Floor, 60-Dominion House, St Bartholomew's Hospital, West Smithfields, London EC1A 7BE, UK. sawhneyvin@googlemail.com. 2. Department of Cardiology, 1st Floor, 60-Dominion House, St Bartholomew's Hospital, West Smithfields, London EC1A 7BE, UK.