916-88 Simultaneous Measurement of Left Ventricular Volume and Parasympathetic Activity During Head-up Tilt in Vasovagal Syncope
نویسندگان
چکیده
منابع مشابه
Provocation of neurocardiogenic syncope by clomipramine administration during the head-up tilt test in vasovagal syndrome.
OBJECTIVES We sought to test the hypothesis that activation of the serotonergic system in patients with vasovagal syndrome during the head-up tilt test provokes syncope. BACKGROUND Central serotonergic activation participates in the pathogenesis of neurocardiogenic syncope. Drugs increasing serotonin (5-HT) in the central nervous system have not been tested as drug challenges during the head-...
متن کاملRecurrent vasovagal syncope: comparison between clomipramine and nitroglycerin as drug challenges during head-up tilt testing.
AIMS To compare the responses between clomipramine, a centrally acting substance, and nitroglycerin, with mainly peripheral action, when each drug is used during tilt test for the induction of vasovagal syncope (VVS). METHODS AND RESULTS Hundred patients with recurrent episodes of classical VVS underwent two tilt tests in a randomized sequence. One test included 20 min of tilt at 60 degrees w...
متن کاملCerebral blood flow during vasovagal syncope induced by active standing or head up tilt.
BACKGROUND Vasovagal syncope is usually associated with a sudden drop of blood pressure and/or heart rate. However, occasionally the symptoms of syncope induced by orthostatic stress testing are not associated with obvious haemodynamic changes. The mechanisms of syncope in these patients are not clear. AIM To evaluate changes in cerebral blood flow velocities during orthostatic stress testing...
متن کاملThe effect of atropine in vasovagal syncope induced by head-up tilt testing.
AIMS This single-blinded, randomized, placebo-controlled study was designed and undertaken to assess the efficacy of intravenous atropine administration on haemodynamic impairment induced by head-up tilt testing in patients with vasovagal syncope. METHODS AND RESULTS One hundred and thirteen consecutive patients (62 male and 51 female, mean age 46.3 years) with recurrent syncope, no evidence ...
متن کاملCerebral autoregulatory responses to head-up tilt in normal subjects and patients with recurrent vasovagal syncope.
BACKGROUND The effect of orthostatic stress on dynamic cerebral autoregulation (CA) in normal subjects and patients with recurrent vasovagal syncope (VVS) is unclear. This study assessed the dynamic CA responses of both groups to head-up tilt. METHODS AND RESULTS Seventeen patients with recurrent VVS and 17 pair-matched control subjects underwent 70 degrees head-up tilt for up to 30 minutes. ...
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ژورنال
عنوان ژورنال: Journal of the American College of Cardiology
سال: 1995
ISSN: 0735-1097
DOI: 10.1016/0735-1097(95)91765-p