Predictors of positive head-up tilt test in patients with suspected neurocardiogenic syncope or presyncope.
Neurocardiogenic syncope is the most common cause of syncope in patients who present in outpatient clinics. Head-up tilt test (HUT) has been widely used to diagnose neurocardiogenic syncope. However, the HUT does not always produce a positive response in patients with suspected neurocardiogenic syncope. The aim of the present study was to assess the clinical history and characteristics of patients with suspected neurocardiogenic syncope or presyncope who undertook HUT, and to identify prognostic factors of a positive HUT response. During the first phase of HUT, patients were tilted to a 70-degree angle for 30 minutes. If the first phase produced a negative response, the second phase was subsequently performed involving intravenous isoproterenol administration. Of 711 patients, 423 (59.5%) patients showed a positive HUT response. In contrast to previous studies, this study showed that the vasodepressive type (76.6%) was the most common pattern of positive response, and that the rate of positive response during the first phase was low (7.1%). By multivariate analysis, the occurrence of junctional rhythm was found to be a predictor of an impending positive response in HUT (P < 0.001). The shorter time interval between the last episode and HUT was also a predictor of positive response (P = 0.0015). Younger age (P = 0.0003) and a history of physical injury during a syncopal episode (P = 0.019) were found to be associated with a positive response in the first phase of HUT.
Oh
Ju Hyeon
JH
Department of Medicine, Masan Samsung Hospital, Masan, Korea.
Kim
June Soo
JS
Kwon
Hyun Cheol
HC
Hong
Kyung Pyo
KP
Park
Jeong-Euy
JE
Seo
Jung Don
JD
Lee
Won Ro
WR
D000318:Adrenergic beta-Agonists; D000328:Adult; D005260:Female; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D007545:Isoproterenol; D016015:Logistic Models; D008297:Male; D011237:Predictive Value of Tests; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D019462:Syncope, Vasovagal / Q000175:diagnosis*; D018667:Tilt-Table Test; D013997:Time Factors
D000318:Adrenergic beta-Agonists; D007545:Isoproterenol