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This study sought to determine the relation between mean RR intervals as well as its circadian rhythm and non-invasive markers of atrioventricular (AV) node refractoriness and concealed AV conduction obtained from Lorenz-plot (LP) analysis of 10-min and 24-h ECGs. In 29 patients with persistent atrial fibrillation (AF) the 1.0-s intercept of the lower envelope (LE1.0) of the plot and the degree of...
Aim of the study was to assess the effect of the adrenergic stimulation on the dynamic of atrial signals (AS) during atrial fibrillation (AF). The AS, derived from surface ECG after having removed ventricular activity, were analyzed using the detrended fluctuation analysis. A sympathomimetic drug, the isoproterenol mimicking adrenergic activation, was administered in 13 patients with paroxysmal or...
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