The features of serum homocysteine concentration in children with vasovagal syncope
Background. In recent years, there have been increasing reports of vitamin B12 deficiency in patients with vasovagal syncope. Therefore, homocysteine levels in these patients may also differ from those in the healthy population. The purpose of the research was to study the peculiarities of serum homocysteine concentration in children with vasovagal syncope. Materials and methods. The main group consisted of 28 children aged 8–17 years with a diagnosis of vasovagal syncope. The control group included 23 apparently healthy children of the same age who had no signs of chronic diseases. The determination of vitamin B6, B12, folic acid, and homocysteine in the blood serum was performed by means of a colorimetric enzyme-linked immunosorbent assay using the Monobind test system. Hyperhomocysteinemia was diagnosed at the level of serum homocysteine above 15 μmol/l. Results. There were decreased serum levels of vitamins B6 and B12 with unchanged folic acid levels in children with vasovagal syncope compared to healthy respondents. In the vasovagal syncope group, an increased level of homocysteine was observed compared to the controls (13.86 ± 0.97 μmol/l; 7.81 ± 0.36 μmol/l; p = 0.000003). The prevalence of hyperhomocysteinemia among children with vasovagal syncope was 46.4 %, whereas in the control group it was not recorded at all (χ2 = 14.33; p = 0.0002). Homocysteine correlates with P-Q interval (moda and mean), Q-T interval (moda), vitamin B6 (p < 0.05). An increase in serum homocysteine concentration is accompanied by deterioration of some quality of life indicators according to the PedsQLTM (general well-being scale, multifactorial fatigue scale, family impact module). Conclusions. Vasovagal syncope in childhood is associated with increased serum homocysteine. The prevalence of hyperhomocysteinemia among children with vasovagal syncope is 46.4 %.
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