Pierre W. Duchosal

The Spatial Vectorcardiogram Obtained by Use of a Trihedron and Its Scalar Comparisons

The spatial vectorcardiogram is supposed to represent the path of the cardiac vector viewed from a rather large distance. With this in mind, the authors propose a vectorcardiographic method based on a trirectangular trihedron. Comparisons are made between calculated scalar leads derived from the spatial vectorcardiogram, and real scalar leads recorded from the subject. In case of concordance the hypothesis of a single instantaneous cardiac vector within an homogeneous conducting medium is verified. This was found to hold for most circumstances. However, for those instances in which discrepancies arose another hypothesis is advanced.

Cardiovascular Aspects of the Ehlers-Danlos Syndrome Report of a Case with Pulmonary Artery Bifidity and Aortic Arch Anomaly

The case of a 10--year-old boy is reported because of the association of the Ehlers-Danlos syndrome with bifidity of the pulmonary artery and anomaly of the aortic arch.The cardiovascular aspects of this connective-tissue disorder are reviewed, and the possibility of another common feature with the Marfan syndrome is briefly discussed.