[Bioelectrical activity of the myocardium in children born to parents irradiated during the Chernobyl disaster with isolated abnormal chords of the left ventricle]

A total 156 children of the main group (children born to parents irradiated during the Chernobyl disaster), who according to echocardiography revealed a different number of isolated abnormal chords of the left ventricle, 20 healthy children, 24 children of nosological control group and 50 children of referent group have been observed. It was found that isolated AHLV in children born to irradiated parents, was associated with changes in standard ECG, reflecting the presence of arrhythmias or predictors of their development. No significant differences in subgroups of children with different number of isolated AHLV have been established. Children with isolated AHLV born to parents irradiated during the Chernobyl accident, as all patients with minor structural anomalies of the heart, should be refered to a risk group in connection with the possibility of the development, in the first place, ventricular extrasystoles, paroxysmal ventricular tachycardia. Early diagnosis of isolated AHLV will allow to assess the outlook for further course of the disease and develop a plan of treatment and preventive measures.

[Analysis of structural and functional indices of the children hearts with isolated abnormal chords of the left ventricle and who were born to parents irradiated during the Chernobyl accident]

156 children of the main group, born to parents irradiated in the result of Chernobyl disaster have been involved in the study. These children were identified with isolated abnormal chords of the left ventricle (AHLV) according the results of Doppler echocardiography. 39 practically healthy children and 24 children of the nosology control group have also been observed. Threshold quantity of AHLV were determined in 33 children, main group, (subgroup Ia), sub-threshold--in 123 children (subgroup I(B)). The children of the control group with threshold quantity of AHLV were found with decreased adaptation capacity of the cardio-vascular system through shifts in dynamics and energetics of the heart contraction. Reduction in systolic output, systolic and heart indices justify hypokinetic type of organization of central hemodynamics, which can be considered an early sign of tension of functional capabilities of the heart and blood vessels. This subgroup of children was found to have changes of transmitral blood flow indicating the initiation of the heart's diastolic dysfunction. Almost 1/3 of children with subthreshold number of AHLV were also revealed to have signs of initiation of the heart's diastolic dysfunction.

[Autonomic homeostasis of children born to parents irradiated in the result of the Chernobyl catastrophe with isolated abnormal chords of the left ventricle]

156 children of the main group (were born to parents irradiated in the result of Chernobyl disaster), in which according to Doppler echocardiography isolated abnormal chords of the left ventricle (AHLV) identified, 44 children of control group and 50 children of referent group were involved in the study Analysis of indicators of operational regulation of heart rate in children of primary group indicate the existence of autonomic dysregulation, which has the maximum expression in children with a threshold number of isolated abnormal chords. Evidence of autonomic dysregulation in children born to parents irradiated in the result of the Chernobyl disaster with isolated AHLV requires primary and secondary prevention to reduce the frequency of unfavourable clinical course.