Objective: To investigate rates of inappropriate shocks in patients with a Medtronic Protecta implantable cardioverter defibrillator device (Medtronic Inc., Minneapolis, MN, USA). Methods:Consecutive patients implanted with Protecta defibrillators at a single centre between April 2010 and July 2012 were studied retrospectively.Results: Follow-up data was available for 599 patients(84% male; age 64 ± 14 years, range 16-92; 49% secondary prevention indication; 42% cardiac resynchronisation therapy, 24% single chamber, and 34% dual chamber defibrillator devices). Mean follow-up was 19 ± 7 months. 57 patients (9.5%) received a shock: 8 patients(1.3%) had inappropriate shocks; 50 patients(8.3%) had appropriate shocks. Of the 10 inappropriate shocks, seven were for supraventricular tachycardia; one for T-wave oversensing; one due to lead displacement; and one occurred after an appropriate shock for ventricular tachycardia. Conclusions:Our reported inappropriate shock rate over a 20-month follow-up period is lower than previously reported.