Despite reported benefits of the FAED [Martinez-Rubio A, Kanaan N, Borggrefe M, Block M, Makijarvi M, Fedele F, et al. Advances in treating in-hospital cardiac arrest: safety and effectiveness of a new automatic external cardioverter-defibrillator. J Am Coll Cardiol 2003;41(4):627-32; Mattioni T, Kanaan N, Riggio D, Bahu M, Lin D, Welch S, et al. Performance of an automatic external-cardioverter-defibrillator algorithm in the discrimination of supraventricular from ventricular tachycardia. Am J Cardiol 2003;91:1323-26], personal and contextual issues affected the clinicians' decision making. More and better understanding about how FAEDs and their context of use may challenge established practice is required in order that it is utilised in the most effective way.