Why the study?
Does the incidence and type of neurally mediated syncope induced by head-up tilt testing differ between syncopal patients with and without arrhythmias?
Does the incidence and type of neurally mediated syncope induced by head-up tilt testing differ between syncopal patients with and without arrhythmias?
Neurally mediated syncope occurs at similar rates in syncopal patients with and without arrhythmias during tilt testing, and is frequently accompanied by vasodilatation and an increase in extrasystoles in those with tachyarrhythmias.
Comparable neurally mediated syncope rates on tilt testing irrespective of arrhythmias; leaves open arrhythmia influence on mechanisms in observational cohorts.
Understanding the causes of syncope in patients with arrhythmia is important in determining the therapeutic interventions. Neurally mediated syncope (NMS) was evaluated in 55 patients with various arrhythmias. The head-up tilt test with or without isoproterenol infusion induced NMS in 41 (74%) patients. When these patients was categorized into 3 types, depending on the development of syncope, vasodilatation was significant in a majority of patients. In 46% of patients with tachyarrythmias, NMS was accompanied by an increase in extrasystole. It was concluded that the evaluation of vasodilatation is important for the preventive strategy of NMS in patients with arrhythmias and that NMS may induce arrhythmias.
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Shinohara et al. (1999) studied this question.
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