Search for: [Abstract = "MVP irrespectively of their TT results when compared to the healthy subjects \[RMSSD\: TT\(\-\) \- 59.8 vs. 67.0 ms, p<0.002 and TT\(\+\) \- 54.6 vs. 67.0 ms, p<0.001\; pNN50\: TT\(\-\) \- 23.3 vs. 24.5%, p<0.003 and 19.3 vs. 24.5%, p<0.002 \). The HF power was significantly lower in children with MVP, irrespectively of their TT results, as compared to normal children \[TT\(\-\) \- 2872.7 vs. 3373.1 ms2, p<0.003 and TT\(\+\) \- 2500.0 vs. 3373.1 ms2, p<0.001\]. The LF\/HF ratio was significantly higher in children with MVP, regardless of their TT results, as compared to healthy children \[TT\(\-\) \- 2.0 vs. 1.3, p<0.004 and TT\(\+\) \- 1.62 vs.1.3, p<0.002 \]. The complex origin of LF may cause the parameter to behave differently in children with NS \(showing a decrease\: 4329.6 vs. 4367.3 ms2\) as compared to children with MVP \(demonstrating an increase\: 4512.9 vs. 4367.3 ms2\). However, in view of the pronounced drop in the HF value in the two compared groups, the LF\/HF ratio increased. Changes observed in the 24\-hour analysis of HRV, i.e. an increase in the LF\/HF ratio and a decrease in the pNN50 and HF values in children with NS and with MVP as compared to the controls support the thesis on disturbed sympathetic\-parasympathetic balance in Group 1 and 2 children, with predominance of the sympathetic system. Under favorable conditions, the excessive adrenergic predominance may trigger the Bezold\-Jarisch reflex and c"]

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