BACKGROUND Asymptomatic reductions in arterial pressure have been reported to occur before the onset of tilt-induced syncope. We investigated the predictive value of these reductions for a positive tilt result. METHODS AND RESULTS In a first study, 238 consecutive healthy subjects with unexplained syncope underwent a passive tilt table test. Finger systolic arterial pressure (SAP) recordings ...

Orientation discrimination and tilt aftereffects (TAEs) were measured to determine if the orientation of luminance and illusory contours are processed by separate mechanisms. The assumption was made that if a single mechanism supports the perception of both types of contours, then illusory and luminance contours that support the same level of orientation discrimination will be equally effective...

Background: Neurocardiogenic syncope is well known as the most frequent cause of syncope in childhood. The head-up tilt table test (HUTT) is now widely used to evaluate patients with unexplained syncope. Although many reports have reported on children associated with neurocardiogenic syncope, the relationship between the clinical characteristics of those patients and the results of the HUTT rem...

Formulas for constructing valid pointwise confidence bands for survival distributions, estimated using unequal probability samples, are derived. In addition, a test statistic for comparing estimated survival distributions from several groups is proposed. The methodology can be applied when survival times are subject to an independent censoring mechanism. The methods are illustrated using data f...

Syncope is a major healthcare problem with significant morbidity, mortality and healthcare cost. It is a common symptom with a complex pathophysiology and, therefore, several aetiologies. Tilt-table testing (TTT) is an important, yet perhaps not widely-used, test that forms part of the management of syncope. We sought to assess the utilisation of this test in our institution for the investigati...