Richard Sutton1, Michele Brignole2,3. 1. National Heart & Lung Institute, Imperial College, Hammersmith Hospital, Du Cane Road, London W12 0NN, UK. 2. Faint & Fall Programme, IRCCS, Istituto Auxologico Italiano, Ospedale San Luca, Milano, Italy. 3. Arrhythmology Centre, Department of Cardiology, Ospedali del Tigullio, Lavagna, Italy.