title: [Differential behaviour of blood pressure in patients with neurocardiogenic syncope during the initial stage of the tilt table test].
abstract: Neurocardiogenic syncope (NCS) is diagnosed by means of a head-up tilt table tests (HUTT). This is a prolonged test although early outcome predictors are known.
  
  
  METHODS
  We conducted a study among patients engaged in a syncope study protocol. We performed HUTT in all of them and compared the basal arterial pressure with the arterial pressure at the end of a the 70 degrees tilting.
  
  
  RESULTS
  We performed 185 HUTT studies. Systolic blood pressure (BP) raised 0.9% among patients with a negative test, whereas patients with a positive HUTT showed a 2.3% decrease (p = 0.2) in the same measurement. Diastolic BP increased 34% among negative HUTT patients and 14.9% among patients with positive test (p = 0.02). We calculated a relative risk of 1.45 for positive test when the combination of systolic BD decrease and dyastolic increase was present, according to the percentage of change (IC95%: 1.1 to 7.8).
  
  
  CONCLUSIONS
  The combination of systolic BP reduction and diastolic BP elevation at the end of the 70 degrees tilting is associated with an increased risk of having a positive HUTT. These changes might be related to differential sympathetic stimulation.
authors.affiliation: Clínica de Arritmias y Marcapasos, Departamento de Cardiología, Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán", Vasco de Quiroga Núm. 15, Col. Sección XVI, Tlalpan México 14000, DF, México. easensio@netvoice.com.mx
authors.forename: Enrique
authors.initials: E
authors.lastname: Asensio Lafuente
authors.forename: Eloisa
authors.initials: E
authors.lastname: Colín Ramírez
authors.forename: Lilia
authors.initials: L
authors.lastname: Castillo Martínez
authors.forename: Jorge
authors.initials: J
authors.lastname: Oseguera Moguel
authors.forename: René
authors.initials: R
authors.lastname: Narváez David
authors.forename: Joel
authors.initials: J
authors.lastname: Dorantes García
authors.forename: Jaime
authors.initials: J
authors.lastname: Galindo Uribe
authors.forename: Arturo
authors.initials: A
authors.lastname: Orea Tejeda
mesh_terms: D001794:Blood Pressure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D019462:Syncope, Vasovagal / Q000503:physiopathology*; D018667:Tilt-Table Test