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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...
The abstract with its heading should not be more than 75 mm long. This is equivalent to 18 lines of text. Leave 1 line space at the bottom of the abstract before continuing with the next heading. The autonomic nervous system modulates atrial electrophysiology in atrial fibrillation (AF). The purpose of this study was (1) to non-invasively characterize the effects of exercise on atrial fibrillatory...
A new method for characterization of simultaneous intra-atrial and ECG recordings during atrial fibrillation (AF) is presented. With different preprocessing, both types of signals are characterized using a logarithmic time-frequency distribution from which trends of frequency, regularity, morphology (only ECG) and signal quality are extracted. The objective of the study is to relate ECG measures of...
Determination of spectral parameters from surface electrocardiograms (ECG) during atrial fibrillation (AF) may prove useful for understanding underlying pathomechanisms and selecting optimal treatment. Dominant fibrillatory frequency is the most commonly used parameter today, but bandwidth (BW) and an index of temporal frequency stability (IS) have also been described. However, no study has systematically...
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