Traditionally, aborted cardiac arrest (ACA) due to documented ventricular fibrillation (VF) in the absence of structural heart disease has been termed idiopathic VF. By careful evaluation, a specific etiology can be found in a substantial proportion of patients. The aim of this survey was to assess the yield of an advanced diagnostic work-up to reveal a causative etiology in a real-life clinical setting. Patients from the University Hospital Brno's ACA database were analyzed (514 patients in total). Forty-six patients (31 males) fulfilled the inclusion criteria, which were: (1) absence of structural pathology on echocardiography; (2) absence of coronary artery disease; and (3) absence of reversible cause of ACA. The diagnostic work-up consisted in cardiac magnetic resonance imaging, stress testing, sodium channel blocker challenge, and genetic testing according to the availability of the method and patient compliance. A specific disease was found in 17 individuals (37.0%), although at least one diagnostic step was refused by 13 patients (28.3%). True idiopathic VF was confirmed in 7 patients (15.2%), for whom the entire diagnostic work-up did not reveal any specific pathology. Our real-life survey shows that, even with an incomplete diagnostic work-up (due to the unavailability of a particular method or variable patient compliance), a specific diagnosis can be identified in more than one third of the cases of "idiopathic" VF, which can thus enable targeted treatment and family screening.

Centre of Molecular Biology and Genetics University Hospital Brno and Faculty of Medicine Masaryk University Jihlavska 20 625 00 Brno Czech Republic

Department of Internal Medicine and Cardiology University Hospital Brno and Faculty of Medicine Masaryk University Jihlavska 20 625 00 Brno Czech Republic

Department of Physiology Faculty of Medicine Masaryk University Kamenice 5 625 00 Brno Czech Republic

Department of Radiology and Nuclear Medicine University Hospital Brno and Faculty of Medicine Masaryk University Jihlavska 20 625 00 Brno Czech Republic

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