Search for: [Abstract = "ause syncope. The above results allowed for formulating the following conclusions\: 1. Among children referred to diagnostic management of syncope, patients with NS constitute a significant percentage \(approximately 60%\). 2. Positive TT results are the most commonly seen in children with NS, showing a preponderance of female gender in the 12\-15 years age group, what supports their value in diagnostic management of this type of syncope. 3. In children with MVP without prior history of syncope, TT demonstrates dysfunction of the autonomous system, what under certain conditions may lead to development of NS and also explain other unclear vegetative disturbances that are periodically observed in these patients. 4. The most common vasovagal reaction to TT, irrespectively of the age and gender of patients, is the mixed type \(MX\), and the least frequent \- the cardioinhibitory type \(CI\), what may indirectly indicate the type of the therapy employed. 5. The time to reaction onset is the shortest in patients with NS, what also indirectly points to a dysfunction of the autonomous system. 6. Some HRV parameters \(pNN50, HF, LF\/HF\) confirm disturbances of the sympathetic\-parasympathetic balance in the vegetative nervous system in patients prone to NS\; the most important of these parameters is the LF\/HF ratio, although no differences have been demonstrated in the results of HRV a"]

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