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- W1497759940 abstract "A quantitative analysis of the Frank system vectorcardiograms, including electronically amplified T loops, of 228 young normal adults and 50 normal adults over 40 years of age, demonstrated remarkable similarities between the two groups. In both, the T loops maintained counterclockwise rotation in the horizontal and sagittal planes, very narrow ranges of magnitude and direction in all planes, and asymmetry of inscription (slow efferent and rapid afferent limbs). The principal T loop change with aging was a decrease in the length-to-width ratio in the horizontal and sagittal planes; the minimal ratio for the older group was 1, compared to 2 for the younger group. The normal QRS loop in adults over the age of 40 differed from that of younger adults in the following respects: (1) It was shifted leftward and superiorly, presenting a greater area broadside to the horizontal plane. (2) The variation in the direction of its maximal vector was decreased, along with the reduction in configurational differences. (3) The magnitude of its maximal vector was significantly less than that of the younger group in the sagittal and horizontal planes. This suggests that different vectorcardiographic voltage criteria for left ventricular enlargement will be required for each group. Analysis of the resolved open plane added little to nothing to the information readily available from standard views. In light of the cost and complexity of the equipment and the time required for its use, a spatial aspect changer is not considered clinically valuable at this time." @default.
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- W1497759940 date "1966-11-01" @default.
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- W1497759940 title "A quantitative study of the Frank vectorcardiogram" @default.
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- W1497759940 doi "https://doi.org/10.1016/0002-9149(66)90084-1" @default.
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