摘要:

In this paper a concept of intrinsic blood pressure is formulated. This pressure was measured in 84 subjects with normal and abnormal vascular systems. It is concluded that shock, congestive failure, hypertension and the normal vascular system can be defined and understood in terms of intrinsic blood pressure.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

Data derived from experiments on cadavers have been used to test old methods and to design new methods of estimating cardiac stroke volume from estimations of blood pressure, made both by intra-arterial and standard clinical technics. From the data has been derived a method of estimating stroke volume from pulse pressure, diastolic pressure and age, which has reasonably good accuracy in the cadaver experiments, and which is so simple that it could be easily applied by any physician using the apparatus he now has.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

The results secured by the simple method of estimating cardiac output, described in the previous paper, have been applied to data already in the literature. Hundreds of comparisons are possible between estimates of cardiac output made by our blood pressure method from values given by the authors, and the results of estimates of cardiac output by some other well known method employed at the same time. The correlations between the results secured by our method and those obtained by Fick, acetylene, ethyl iodide, and nitrous oxide methods are often surprisingly good. There is an unexplained difference in level between the Fick and blood pressure estimates, but not between the blood pressure estimates and those of the three older methods.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

One hundred eighty-one patients suffering from 216 separate episodes of thromboembolism were treated with anticoagulants by the author in private practice. The indications and contraindications for anticoagulants are described and the results tabulated and analyzed. Practical methods of administration of anticoagulants are discussed. Long-term ambulatory anticoagulant therapy is considered as a special and important aspect of the problem of thromboembolism with the results indicating it to be a practical and feasible form of preventive therapy worthy of more widespread use.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

In 31 patients with mitral stenosis of varying severity the effect of light, steady exercise during 15 to 17 minutes on renal function and renal circulation has been studied during heart catheterization. The results have been compared with the values obtained at rest in 72 patients with mitral stenosis. Exercise produced a decrease in clearance of para-aminohippurate and sodium excretion and an increase in renal resistance, changes not produced in normal individuals. Cardiac output and pulmonary pressures increased. In patients with right heart failure exercise produced increased pressures but no increase in cardiac output, and only slight changes in clearance but increase in renal resistance and renal venous pressure.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

In a study of the nature of the renal changes in patients with mitral stenosis, lowered renal function and reduced renal circulation the effect of Apresoline, given during heart catheterization to 12 patients with mitral stenosis of varying severity, was studied. The drug was found to increase renal blood flow (and decrease arterial blood pressure), showing that the renal changes in mitral stenosis are reversible. The two effects of Apresoline were shown to be independent of each other.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

Starling's law of the heart has been studied in the dog with a complete circulation with the continuous registration of cardiac output, and atrial and arterial pressures. From this data ventricular function curves were constructed. In any given physiologic state there was a consistent and reproducible correlation between atrial pressure and ventricular stroke work on the same side. The classically conceived descending limb did not occur in the normal heart. The concept of a family of Starling or ventricular function curves adds a third dimension to the adaptive capacity of the heart as put forth by Frank and Starling.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

An electrocardiographic pattern was encountered in patients with cerebrovascular accidents which consisted primarily of T waves of large amplitude and duration. Large U waves were often present which may fuse in part or entirely within the T wave. Because of the presence and fusion of the T and U waves, the prolonged Q-T interval associated with the pattern was most probably a Q-U interval.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

摘要:

The accuracy of currently used vector methods of analysis of frontal-plane electrocardiograms and the behavior of the Wilson central-terminal voltage are investigated experimentally by means of an accurate unipolar voltage technic, using human torso models filled with a homogeneous conducting fluid in which is immersed a heart dipole. The errors entailed in the determination of the manifest heart vector from torso surface voltages by means of Einthoven's vector projection methods are found to be very sizable and strongly dependent upon the position of the heart dipole which is placed at various points within the heart volume in this investigation. Einthoven's angle &agr; is found to depart from the actual heart-vector angle by −7 degrees to +41 degrees, at the instant when the manifest heart vector is a maximum, and the amplitude and shape of frontal-plane vector loops and limb leads are found to be considerably distorted, in many cases, as compared with the actual heart-dipole behavior. The Wilson central-terminal voltage is found to depart from its ideal value of zero by approximately 15 to 40 per cent of the maximum value of the manifest heart vector as seen in the frontal plane, in typical cases, and by more than 200 per cent in extreme cases. It is shown that the component of the dipole perpendicular to the frontal plane is not negligible in influencing the limb-electrode potentials. The results are found to be consistent within 10 per cent or better for a male and female torso differing widely in proportions and contour, except for an increase in the female torso voltages arising from its smaller physical dimensions. The results are presented principally in terms of the QRS complex, but the geometric triangle representation is given as are numerical coefficients which describe torso surface voltages.

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID

ISSN:0009-7322    

出版商:OVID    

年代:1954

数据来源: OVID