Nitrate-stimulated head-up tilt testing (HUT) is currently recommended to confirm the diagnosis of vasovagal syncope in subjects with syncope of unknown origin. Given the few data currently available, the aim of this study was to assess correlations between nitrate-induced HUT outcomes and the clinical characteristics of patients.
Cardiology Unit, Emergency and Organ Transplantation Department, University of Bari, Piazza Giulio Cesare 11, 70124 Bari, Italy. massimo.iacoviello@cardio.uniba.it