Insertable loop recorder in unmasking the cause of syncope

During the last few years closed loop recorders are being used increasingly in the investigation of unexplained syncope. Our patient had a 5-year hist ory of pre- and syncopal episodes in which the usual invasive and non-invas ive tests were nondiagnostic. Finally, a loop recorder was implanted that r evealed the cause of the syncope a few days after implantation: a fast, sus tained, ventricular tachycardia originating from the right ventricular outf low tract. Loop recorders will undoubtedly contribute toward the decrease i n the percentage of undiagnosed syncope cases and possibly to the reduction of the investigation cost.