[High-resolution electrocardiography evaluation of late potentials. A comparison between Frank XYZ orthogonal leads and standard precordial electrocardiographic leads].
High-resolution electrocardiography has been used as a non-invasive method for the study of delayed potentials in order to evaluate the risk of the onset of ventricular arrhythmia first in ischaemic cardiopathy and then in various cardiopathies, generally using XYZ orthogonal derivations. The aim of this study was to compare the results obtained with those using standard precordial leads, in particular V4 and V6 leads. A group of 28 patients, males and females, aged between 15 and 55 years of age, was examined. All patients were suffering from different cardiopathies. Subjects with delayed right and left ventricular activation on the surface ECG tracing were excluded from the study. A 60-200 Hertz bandpass filter and time averaging of 300 consecutive complexes were used to analyse tracings. Dual recordings were performed for each patient. The following parameters were examined: total duration of filtered QRS complex and root-mean-square voltage of potentials in the last 40 msec of filtered QRS (RMS). In particular, the comparison between RMS using Frank's method and those obtained using V4 and V6 precordial leads provided a coefficient of correlation of r = 0.91 with p < 0.001 and r = 0.92 with p < 0.001 respectively, and the comparison between QRS obtained using the same method and that obtained using V4-V6 precordial leads gave a coefficient of correlation of R = 0.80, p < 0.001 and r = 0.77 and p < 0.001 respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
Cozzi
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Servizio di Cardiologia con Unità Coronarica, Ospedale Sant'Antonio Abate, Gallarate, Varese.
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D000293:Adolescent; D000328:Adult; D001145:Arrhythmias, Cardiac / Q000175:diagnosis; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged
Determinazione mediante elettrocardiografia ad alta risoluzione dei potenziali tardivi. Confronto fra le derivazioni ortogonali XYZ di Frank e le derivazioni elettrocardiografiche precordiali standard.