摘要:

The disappearance of a third heart sound in a case of calcific pericarditis after surgery together with a quantitative study of the time and frequency relations of the third heart sound in 70 cases suggests that the tensing of the pericardium is a factor in its production. The frequency characteristics of the third heart sound are such that it may be identified in the presence of a diastolic murmur.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Multipolar recording techniques have been used to study excitation of the canine interventricular septum. Activity commences in the mid left septal endocardium and slightly later near the right anterior papillary muscle. From these sites depolarization spreads over the endocardial surfaces, probably via the Purkinje tissue, at 1 m./sec. and through the septal thickness at one-third this speed. Near the upper septum, bilaterally and on the posterior right there is a lack of the rapid endocardial conduction. Septal contribution to the QRS is considered.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Using the BSP extraction technic, the hepatic blood flow of the dog was found to be reduced markedly following a single massive hemorrhage. However, increase in the arterial hepatic venous-oxygen difference compensated for as much as 75% reduction in flow; hence, splanchnic oxygen consumption was maintained under these circumstances. Significant reduction of splanchnic oxygen consumption occurred only during sustained shock when hepatic blood flow was so seriously diminished that high oxygen extraction could not compensate for the lowered oxygen delivery to the liver.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Rats with experimental renal hypertension were fed various diets differing in sodium and protein content. Marked prolongation of life was achieved by rice diet. Polyarteritis nodosa developed, as a result of the experimental procedures, in 23.5 per cent of the animals. Its incidence was closely correlated to sodium ingestion: 4 per cent in rats on low sodium intake, 36 per cent in rats on normal or slightly higher sodium intake. Protein intake showed no effect on incidence of polyarteritis but distinct effect on survival time. Except for one rat where a sarcoma destroyed almost all kidney tissue, no animal on rice diet developed polyarteritis nodosa.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

This paper is a preliminary report describing adaptation of the technic used for determination of blood volume and cardiac output by thorium B-labeled red cells to estimation of cerebral blood flow and its distribution.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The response of arterial pressure to very rapid central venous bleeding has been utilized in an attempt to establish an arterial pressure-volume relation in the intact dog. When dogs were bled for a brief period at rates between 200 and 500 cc. per minute the arterial pressure declined as a rectilinear function of the bleeding volume. The compensatory mechanisms of cardiac acceleration and vasoconstriction do not influence this relationship. Abolition of the vasomotor pathways does, however, increase the slope of the blood pressure decline curve. This is explained on the basis of a decrease in the initial volume of the arterial reservoir.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Evaluation of the potential of the Wilson terminal in 33 normal young adults indicates that its potential is zero about once in every twelve. Weighting of the terminal brought its potential to zero in ⅔ of the subjects and left a very small residual (technical) error in the remainder. The vertical component of the cardiac vector is primarily responsible for the error on the Wilson terminal. A weighted terminal in which the arm resistances are 2.6 times the left leg resistance has a zero potential in 50 percent of a small group of subjects. The residual error on the weighted terminal is at most one-half of that on the Wilson terminal. The eccentric origin of the cardiac vector varies only with respiration. Ordinarily, the zero-potential plane of the antero-posterior component of the cardiac vector passes simultaneously through or just dorsal to the limb electrodes and contributes little to the negative error on the Wilson terminal.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The extra-cardiac sites of action of strophanthin-K, quinidine and procaine amide have been investigated by injection of varying doses into the third ventricle of unanesthetized dogs. A profuse autonomic nervous system discharge was produced. Strophanthin-K produced a paroxysmal ventricular tachycardia resulting in death by ventricular fibrillation. Such effects could be blocked by prior intraventricular injection of either quinidine or procaine amide or by intravenous administration of hexamethonium.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Study of the platelets from the viewpoint of the blood coagulation mechanisms seems likely to be helpful for increasing our knowledge of thrombosis, and bleeding tendencies in thrombasthenias and thrombopathias. A logical approach to their study is the differentiation of their properties and where possible to ascribe those properties to individual components. Platelet factors 1, 3 and 4 are considered from that viewpoint. The first accelerates the formation of thrombin in a manner analogous to serum Ac-globulin. Factor 3 is required for the development of threone activity, and factor 4 has antiheparin properties.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID