Day-to-day variation of the normal orthogonal electrocardiogram and vectorcardiogram.

The normal orthogonal electrocardiogram and vectorcardiogram, with a critique of some commonly used analytic criteria.

Correlations of the orthogonal electrocardiogram and vectorcardiogram with consitutional variables in 518 normal men.

Day to day variation in 3 orthogonal lead electrocardiogram parameters after acute myocardial infarction.

Serial 3 orthogonal lead electrocardiograms were recorded on 67 patients with acute myocardial infarction. For each series of electrocardiograms, the day to day changes and the changes with respect to the initial computer measurements of selected ST-T segment amplitudes and vector orientations were investigated. The results indicated that the degree of rotation of ST-T vectors, which correspond...

Day to day and beat to beat variation in normal 3 orthogonal lead electrocardiograms.

Beat to beat and day to day variation in computer calculated electrocardiographic measurements is described on the basis of a study of normal serial 3 orthogonal lead electrocardiograms recorded on 25 patients. The variation of scalar amplitudes and vector orientations was investigated for both the QRS complex and the ST-T segment. The 96 per cent ranges of beat to beat and day to day variation...

Day - to - Day Variation of the Normal Orthogonal Electrocardiogram and Vectoreardiogram

Day-to-day variation of the corrected orthogonial electrocardiogram was investigated in 20 normal subjects. Ten recordings were made in each individual witlh chest electrode positions left unmarked first, after which 10 subjects underwent another series of 10 consecutive daily recordings with marked electrode locations. Mean and maximal day-to-day variations of durations and amplitudes of diffe...