摘要:

Field analysis methods provide a convenient mathematical process for organization of electrocardiographic observations. The degree of divergence of calculated spatial orientations of heart forces from true orientations is dependent upon the magnitude of inaccuracy of the assumption that body tissues are electrically homogeneous. Preliminary to undertaking quantitative measurements of tissue resistivities in situ, technical difficulties of the problem have been surveyed, and previous studies have been analyzed. It is concluded that an accurate, quantitative measurement of such resistivity has not been made. If major inhomogeneity were found, current methods of application of field theory to electrocardiography might require extensive modification.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

Four illustrative cases of localized interlobar effusion as a manifestation of congestive heart failure are presented. The right transverse fissure was most often involved. The x-ray shadow was dense and variable in shape, frequently resembling a tumor mass, and consequently presented a diagnostic problem. Diagnosis was confirmed by demonstrating the disappearance of the "tumor" following diuresis and restoration of cardiac compensation. The disorder is apparently not rare.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

The effectiveness of khellin in 9 patients with angina pectoris was evaluated electrocardiographically by means of the exercise tolerance, anoxemia and ergonovine tests. Normalization occurred in the majority of the previously abnormal tests following khellin therapy. A beneficial effect was noted on symptoms accompanied by a reduction in nitroglycerin requirement. Mild toxicity, as a result of khellin therapy, was observed in 3 cases.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

Records are presented which have been obtained from man by direct intra-arterial catheterization and electrocardiography. These records have been selected (1) because they offer evidence for the validity of Starling's law in intact man and (2) because they demonstrate that when the heart is influenced by activity of the so-called "intrinsic" reflexes these manifestations of Starling's law are modified. It appears from these types of data that ventricular activity may be directly affected independently of influences upon the pacemakers of the heart.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

A vasopressor substance has been dialyzed out of the circulating blood of dogs by means of an artificial kidney. This substance is similar to hypertensin. It has been recovered from normotensive and hypotensive dogs and from animals with malignant hypertension. The method for concentration of this substance in the dialyzate is described and concentration data which, due to the loss in recovery, is only roughly quantitative, is given.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

Experienced clinicians have known for some time that bleeding owing to the use of dicumarol is not entirely a measure of the degree of prothrombin deficiency. This presentation emphasizes that bleeding may occur when prothrombin deficiency is not great and that bleeding may fail to occur when prothrombin deficiency is marked. Nonetheless great prothrombin deficiency causes bleeding more frequently than lesser degrees of prothrombin deficiency. Time is an important factor, for patients are much more apt to bleed when prothrombin deficiency has endured for several days than when it has been present only a day or so.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

The blood flow, as reflected by the arteriovenous oxygen difference, in the arms and legs is greater in the dependent position than in the horizontal position. The physiologic and clinical significance of this finding is discussed.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

Employing the Sheldon method of physique classification, it has been shown that a definite relationship exists between the various physiques and the level of lipids in the serum of a coronary disease group and a control group. Positive correlations existed between endomorphy and serum lipids, negative correlations existed between ectomorphy and serum lipids. There were negligible correlations between mesomorphy and the serum lipids. Intragroup comparison in the coronary disease patients showed that the general trend of endomorph-ectomorph differences continued, but that the lipid values in coronary mesomorphs were higher than in the coronary endomorphs.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

Cardiac output and blood voluine are at control levels in unanesthetized hypertensive dogs during the depressor response to acute inflammation. Hence the fall in blood pressure is due to a decreased total peripheral resistance. The accompanying renal hyperemia indicates that decreased resistance in the renal vascular bed accounts for a significant portion of the fall in total peripheral resistance. Drug studies further suggest that acute inflammation operates to lower blood pressure in hypertensive dogs via mechanisms other than complete paralysis of autonomic vasomotor activity.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID

摘要:

Exercise performed in the supine position by patients with congestive failure was found to cause not only a greater elevation of the peripheral venous pressure than it causes in normal persons, but also a proportionately greater fall of the plasma volume.

ISSN:0009-7322    

出版商:OVID    

年代:1950

数据来源: OVID