[Electrolyte abnormalities and ventricular arrhythmias in children with mitral valve prolapse].

The aim of this study was to determine plasma concentration of magnesium, potassium, calcium and sodium in children with mitral valve prolapse (MVP) and to establish the relation between electrolyte abnormalities and ventricular arrhythmias (VA). The study group consists of the 113 children with MVP (age +/- SD: 10.7 +/- 4.

[Dysrhythmias documented by 48-hour electrocardiographic monitoring in children with mitral valve prolapse].

The association of dysrhythmias with mitral valve prolapse (MVP) in pediatric patients was examined by 48-hour ECG monitoring. Fifty unselected children with clinical diagnosis of MVP confirmed by echocardiography were studied. Eight (16%) patients manifested atrial dysrhythmias.

[Primary pulmonary hypertension in children].

The aetiology, pathogenesis, clinical manifestations and course of primary pulmonary hypertension are discussed in children, describing the diagnostic methods in this disease entity. In view of the suggestion that vasoconstriction plays an important role in the pathogenesis of this disease attention is called to the usefulness of pharmacological test done during cardiac catheterization. Such tests could indicate the direction of further therapeutic measures.