[Differential behaviour of blood pressure in patients with neurocardiogenic syncope during the initial stage of the tilt table test].
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.
Asensio Lafuente
Enrique
E
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
Colín Ramírez
Eloisa
E
Castillo Martínez
Lilia
L
Oseguera Moguel
Jorge
J
Narváez David
René
R
Dorantes García
Joel
J
Galindo Uribe
Jaime
J
Orea Tejeda
Arturo
A
D001794:Blood Pressure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D019462:Syncope, Vasovagal / Q000503:physiopathology*; D018667:Tilt-Table Test