Evaluation of autonomic nervous system functions by using tilt table test and heart rate variability in epileptic children

Objective: The value of head-up tilt test (HUTT) for differential diagnosis epilepsy and the autonomic nervous system functions in
 epileptic children using heart rate variability (HRV) are studied.
 Patients Methods: study group consisted 16 with idiopatic/criptogenic 12 controls. Heart rate, PR
 interval, corrected QT (QTc) QTc dispersion were calculated 12-lead electrocardiogram (ECG), HRV analysis
 was performed Holter recordings obtained both during HUTT throughout day. Time domain parameters, standard
 deviation all RR intervals (SDNN), standard mean NN in five-minutes recording (SDANN), (SDNNi), root square successive differences (RMSSD), count divided
 by total number (pNN50) frequency parameters low (LF), high (HF), lowfrequency/
 high-frequency ratio (LF/HF) compared between two groups.
 Results: Head-up positive 4 (25%), none controls positive. patients were
 higher than (p=0.015). LF/HF 24-hour recordings, significantly lower (1.13±0.6, 1.83±0.7 respectively,
 p=0.002); SDANN (28.7±20.2, 18.2 ± 19.9 respectively, p=0.024) the
 controls.
 Conclusion: positivity is frequent children, cannot be used diagnosis. calculated
 from 24 hour under orthostatic stress impaired favour parasympathetic
 children.