Conduction velocity (CV) and the amount of conduction block (CB) was calculated. Unipolar voltage, relative R-to-S-amplitude ratio and duration of all potentials was calculated. Unipolar potentials were classified as single-, short or long double- and fractionated potentials. Methods: Epicardial mapping of the SAN was performed during sinus rhythm in 12 pediatric (0.6 years) and 15 adult (47 years) patients. We examined differences in electrophysiological properties of the sino-atrial node (SAN) area between pediatric and adult patients with CHD. 2Department of Cardiothoracic Surgery, Erasmus Medical Centre, Rotterdam, Netherlandsīackground: Sinus node dysfunction (SND) and atrial tachyarrhythmias frequently co-exist in the aging patient with congenital heart disease (CHD), even after surgical correction early in life.
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