Effects of hemodialysis on ventricular activation time in children with end-stage renal disease

Patients with end-stage renal disease are affected by cardiovascular complications, including disturbances of the heart intraventricular conduction. Body surface potential mapping is a non-invasive electrocardiographic detection method of initial disturbances in heart activation propagation. A goal of the study was to analyze the effects of single hemodialysis (HD) session on ventricular activation time (VAT) maps obtained from hemodialyzed children. The study group consisted of 13 hemodialyzed children (age: 6-18 years). The control group is composed of 26 healthy subjects. In each HD patient, 12-lead electrocardiogram and echocardiography examinations were performed. Isochrone heart maps, reflecting body surface distribution of VAT isolines, were recorded from an 87-electrode HPM-7100 system for body surface potential mapping, before (group B) and after HD session (group A). The distribution of isochrones and VAT values, as recorded in the HD patients, differed significantly from the reference VATmap for controls. The highest VAT maximal value was noted in group B (Me: 110 vs. 62ms in the control group; P<0.001), becoming significantly lower after HD session (Me: 98ms for group A vs. 110ms for group B; P<0.001). Ventricular activation time maps, recorded before HD session, showed significant VAT delays with isochrone arrangement specific for the left bundle branch block. After HD session, VAT maps presented significant changes, suggesting a normalization process. Ventricular activation time maps in children with end-stage renal disease exhibited disturbances of intraventricular conduction within the left bundle branch block, undetectable on standard electrocardiogram. A single HD session resulted in VAT map improvement related to overall HD treatment duration.