Copyright © 1991 by the European Society of Cardiology.
© 1991 The European Society of Cardiology
The incidence of malignant vasovagal syndrome in patients with recurrent syncope
Westminster Hospital Dean Ryle Street, London, U.K.
Received 30 October 1989; revised 24 July 1990; .
Request for reprints:Dr R.Suttan,Cardiac Department,Westminster Hosipital,Dean Ryle Street,London SWIP2AP,U.K.
Abstract
We reviewed 322 patients with recurrent syncope between 1984 and 1988. Investigation included limited intracardiac electrophysiological study in all cases with programmed extra-stimulus studies in 48 cases. In 93 patients (29%), all investigations were normal, (including negative extrastimulus in 30). In the other 229 cases syncope was explained by AV-block (n = lll, 34%), sinus node disease (n = 68, 21%), carotid sinus syndrome (n = 32, 10%) and inducible sustained tachyarrhythmia (n=18, 6%). Prolonged 60° head-up tilt was performed in 71 out of 93 patients with unexplained syncope, and reproduced vasovagal syncope and presenting symptoms in 53 (75%), or 16% of the whole population reported. These patients were diagnosed as having malignant vasovagal syndrome. Positive tilts were significantly less common in a group of 27 subjects of similar age without a history of syncope (7%), and a random sample of 37 patients with atrioventricular block (n= 16), sick sinus syndrome (n= 18) and inducible tachy arrhythmia (n = 3) (19%, 11% andO% respectively, P < 0.01). From this retrospective review it appears, therefore, that tilt testing is a valuable provocative tool for vasovagal syncope and may reduce the number of syncopal patients that remain undiagnosed, although these early observations do not allow an exact appraisal of the sensitivity and specificity of the tilt test.
Key Words: Head-up tilt • malignant vasovagal syndrome • unexplained syncope
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