3.3 Diagnostic yield
Arrhythmogenic diagnosis, clinically relevant to the index syncope was diagnosed in 83 of 309 (27%) of patients (Table 2). Type of arrhythmogenic diagnosis in those patients are listed in Table 2. Sick sinus syndrome was present in 60 (72%) of these 83 patients, atrioventricular block (being Mobitz type 2 2nd degree AV block or 3rd degree AV block) in 17 patients (20%) and ventricular tachycardia in 6 (7%). Of those patients with an arrhythmogenic diagnosis, 66 patients (79%) received a pacemaker, and 7 patients (8%) an ICD. The remaining 10 patients (12%) did not receive device implantation based on clinical decision making. Besides etiologic diagnoses explaining syncope, additional diagnoses (mostly atrial fibrillation or atrial flutter) were found as well in 58 patients (18.8% of the study population).