P WAVE DURATION AND P-R INTERVAL DURING FIRST WEEK OF LIFE
نویسندگان
چکیده
منابع مشابه
Electrical activity during the P-R interval.
RECENT studies of the electrical activity of single cardiac fibers suggest that most, if not all, disturbances of rhythm have their origin in specialized cardiac tissues rather than in the muscle fibers of the atria or ventricles.' Similarly, many disorders of conduction result from disordered function of these same structures. Unfortunately, the leads employed in clinical electrocardiography f...
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The atria of 37 patients were paced from selected sites during cardiac surgery. When the atria were paced from endocardial sites low in the right atrium, the P waves in ECG leads II, III, and aVF were shown to be either negative, biphasic, or positive, depending on the site paced. When the endocardial sites were paced, the P-R intervals were, almost without exception, less than 0.12 sec. When t...
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E LECTRIC signals generated from the heart are more properly defined in mag. n-itude and direction by an orthogomial 3 lead system with constancy iii lead direction and strenogth.l1The spatial heart veetors are projected on the 3 perpendicular axes of such a Cartesiani coordiiiate system, and are readily available for analysis. With the advent of corrected orthogonal lead systems1-4 it appeared...
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We analyzed the effect of changing posture from supine to standing on the variability of R-R, P-R, and R-T intervals in 10 healthy volunteers using power spectral analysis. An electrocardiogram and respiratory trace were recorded before and after posture change. Variability in the P-R and R-T intervals was much less than in the R-R interval and demonstrated a lower low-frequency (LF)-to-high-fr...
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To determine the normal values of P wave duration and P dispersion (Pd=maximum P wave duration-minimum P wave duration) in healthy children, electrocardiograms of 232 healthy children (143 boys, 89 girls, aged 7 to 15 years) were examined. There was no significant gender difference in maximum P wave duration (103+/-9.5 msec vs 102+/-8.4 msec, p=0.23) or P dispersion (27.2+/-5.3 msec vs 26.8+/-6...
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ژورنال
عنوان ژورنال: Heart
سال: 1963
ISSN: 1355-6037
DOI: 10.1136/hrt.25.1.42