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Alternans of the ventricular complex of the human electrocardiogram
SELECTED
759
ABSTRACTS
visible arterial collaterals in the thoracic region are pointed out. The x-ray picture is typical of stenosis of the aorta. It shows the enlarged left ventricle, the usually dilated ascending aorta, and the characteristic notching of the posterior lower margins of the ribs. KATZ.
Rothberger, C. J.: Concerning the Normal Specific Conducting Tissue of the Heart.
and Pathological Cardiologia
Physiology
1: 234,
of the
1937.
An excellent review is presented of the subject with which the author haa long ‘been identified. The article must be read for the details. Among the facts brought iforth, the following may be mentioned: (1) the refractory phase of Purkinje ~fibers is longer than that of ordinary ventricular muscle; (2) as the strength of ;stimulus to the Purkinje fibers was decreased, failure to respond to some of the ‘mpulses was found to occur before the stage was reached where all became ineffechive; (3) the duration of the electrogram of the Purkinje fibers is longer than its kefractory phase and contraction, (4) veratrin in small doses leads to runs of beats bith pauses between them and (5) Purkinje fibers are not as susceptible to low h.vygen content as auricular strips. KATZ.
k
Takino, M., and Watanabe, S.: The Significance of the Ligamentum Arteriosum of the Ductus Botalli and Its Junction with the Pulmonary Artery asi a Blood Pressure Regulator in Various Animals. Arch. f. Kreislaufforsch. 2: 18, 1937. In the embryo and young animal (rabbit, dog, cat, and fetus of man) this region As the c ntains end organs which set up reflexes to help adjust the circulation. P quctus degenerates into a ligament, the end organs move from the aortic attach4ent to the pulmonary artery and still function. KATZ.
Sthellong, F., Schwingel, E., and Germann, Vectoaagram. Arch. f. Kreislaufforsch.
Vector Diagraphg
H.: 2:
and the Normal
1, 1937.
This is a description of the method previously reported by the authors of using oracic leads with stereoscopic orientation. In 100 normal persons the spatial conr of the vector diagram was determined during the inscription of the QRR comx and also during that of the T-wave. The QRS vector has an elliptical form ieh may be interrupted by flat indentations. It starts from zero and moves forrd to the left and down and then backward to the right and then up. At its start first moves up and at its end moves down. The T-wave forms a smaller similar ptoid. The angle between the end of the QRS and T elliptoids is determined an was found in all but 4 cases to be less than 45 degrees. This spatial vector de ived from thoracic leads is more satisfactory than the one derived from leads from th: extremities. KATZ.
t to pl w w it ell
Alternans lectrocardiogram.
Arch.
of the1 Ventricular
f. Kreislaufforseh.
Complex of the Human
2: 47, 1937.
he literature is reviewed by the authors and ten cases are reported. roups of beats as contrasted with alternans between beats is described. mechanical alternans.
Alternans One canKATZ.
759
ABSTRACTS
visible arterial collaterals in the thoracic region are pointed out. The x-ray picture is typical of stenosis of the aorta. It shows the enlarged left ventricle, the usually dilated ascending aorta, and the characteristic notching of the posterior lower margins of the ribs. KATZ.
Rothberger, C. J.: Concerning the Normal Specific Conducting Tissue of the Heart.
and Pathological Cardiologia
Physiology
1: 234,
of the
1937.
An excellent review is presented of the subject with which the author haa long ‘been identified. The article must be read for the details. Among the facts brought iforth, the following may be mentioned: (1) the refractory phase of Purkinje ~fibers is longer than that of ordinary ventricular muscle; (2) as the strength of ;stimulus to the Purkinje fibers was decreased, failure to respond to some of the ‘mpulses was found to occur before the stage was reached where all became ineffechive; (3) the duration of the electrogram of the Purkinje fibers is longer than its kefractory phase and contraction, (4) veratrin in small doses leads to runs of beats bith pauses between them and (5) Purkinje fibers are not as susceptible to low h.vygen content as auricular strips. KATZ.
k
Takino, M., and Watanabe, S.: The Significance of the Ligamentum Arteriosum of the Ductus Botalli and Its Junction with the Pulmonary Artery asi a Blood Pressure Regulator in Various Animals. Arch. f. Kreislaufforsch. 2: 18, 1937. In the embryo and young animal (rabbit, dog, cat, and fetus of man) this region As the c ntains end organs which set up reflexes to help adjust the circulation. P quctus degenerates into a ligament, the end organs move from the aortic attach4ent to the pulmonary artery and still function. KATZ.
Sthellong, F., Schwingel, E., and Germann, Vectoaagram. Arch. f. Kreislaufforsch.
Vector Diagraphg
H.: 2:
and the Normal
1, 1937.
This is a description of the method previously reported by the authors of using oracic leads with stereoscopic orientation. In 100 normal persons the spatial conr of the vector diagram was determined during the inscription of the QRR comx and also during that of the T-wave. The QRS vector has an elliptical form ieh may be interrupted by flat indentations. It starts from zero and moves forrd to the left and down and then backward to the right and then up. At its start first moves up and at its end moves down. The T-wave forms a smaller similar ptoid. The angle between the end of the QRS and T elliptoids is determined an was found in all but 4 cases to be less than 45 degrees. This spatial vector de ived from thoracic leads is more satisfactory than the one derived from leads from th: extremities. KATZ.
t to pl w w it ell
Alternans lectrocardiogram.
Arch.
of the1 Ventricular
f. Kreislaufforseh.
Complex of the Human
2: 47, 1937.
he literature is reviewed by the authors and ten cases are reported. roups of beats as contrasted with alternans between beats is described. mechanical alternans.
Alternans One canKATZ.