title: The clinical relevance of the duration of loss of consciousness provoked by tilt testing.
abstract: OBJECTIVE
  The authors assessed the relationships between the duration of loss of consciousness (dLOC) during tilt testing-induced syncope (TTS) and demographics, medical history as well as tilt testing results. Previous research focused on the relevance of the type of neurocardiogenic reaction during TTS. The importance of dLOC has not been assessed so far. The study was carried out in 274 patients with suspected neurally mediated syncope and total loss of consciousness during tilt testing.
  
  
  RESULTS
  The syncope burden, demographics, and data regarding spontaneous syncope orTTS were compared between group I with dLOC > or =47 seconds and group 2 with dLOC <47 seconds. Medical history revealed that patients in group I had more syncopal spells, more frequent syncope-related traumatic injuries, urine incontinence, jerking movements and typical vasovagal history than in group 2. Moreover, group I patients had more frequently a cardioinhibitory type of reaction and a shorter active phase duration. In addition, they manifested more frequent accompanying cerebral hypoperfusion signs and reproduction of symptoms during TTS than patients in group 2.
  
  
  CONCLUSIONS
  The loss of consciousness during tilt testing-induced syncope differs in terms of duration among patients with neurally mediated syncope. The dLOC during TTS is associated with medical history and tilt-testing data which confirm the vasovagal aetiology of spontaneous events. The longer dLOC suggests deeper cerebral haemodynamic disturbances during either spontaneous or provoked syncope.
authors.affiliation: Teaching Department for Emergency Medical Service, Wroclaw Medical University, Poland. dzysko@wp.pl
authors.forename: Dorota
authors.initials: D
authors.lastname: Zyśko
authors.forename: Jacek
authors.initials: J
authors.lastname: Gajek
authors.forename: Edward
authors.initials: E
authors.lastname: Kozluk
authors.forename: Anil Kumar
authors.initials: AK
authors.lastname: Agrawal
authors.forename: Jacek
authors.initials: J
authors.lastname: Smereka
authors.forename: Igor
authors.initials: I
authors.lastname: Checiński
mesh_terms: D000328:Adult; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010275:Parasympathetic Nervous System / Q000503:physiopathology*; D013575:Syncope / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology*; D019462:Syncope, Vasovagal / Q000503:physiopathology; D018667:Tilt-Table Test; D013997:Time Factors