All patients with unexplained syncope at initial evaluation with indication to perform a Head up tilt test (HUTT) will be randomized to conventional HUTT protocol or fast HUTT protocol characterized by a stabilization phase of 5 min in the supine position; a passive phase of 10 min at a tilt angle of 60 degrees; a provocation phase of further 10 min after 300 micrograms NTG sublingual spray. The novel simplified fast HUTT protocol has been designed to provide non inferior positivity rates as compared with the conventional protocol in the selected population.
The purpose of the study is to compare the positivity rate associated with a novel simplified Tilt-Table (TT) test protocol versus the conventional TT protocol