S Roze1, V Payet2, F Debroucker2, Portu S de3, M Cucherat4. 1. HEVA HEOR, Lyon, France. 2. Medtronic France SAS, Boulogne-Billancourt, France. 3. Medtronic International Sàrl, Tolochenaz, Switzerland. 4. UMR CNRS 5558, Faculté de Médecine Laennec, Lyon, France.