摘要:

Evidence is presented which indicates that electric alternation is frequently associated with pericardial effusion; that this alternation is of a unique type; and that it is caused by movement of the heart in the fluid filled pericardial sac.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

An unusual case of chronic pericarditis with effusion, lasting at least four years, in an asymptomatic child, is presented. The literature on the subject is reviewed. Attention is drawn to the fact that such cases exist, and should be considered when one is confronted with a case of cardiac enlargement of obscure etiology.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Spectral phonocardiography, an adaptation of the method of sound spectrography devised at the Bell Telephone Laboratories, differs from conventional oscillographic phonocardiography principally in the fact that frequency spectrum is displayed as well as the dimensions of time and intensity. The display of frequency spectrum is responsible for three advantages of the method: (1) Quality, or timbre, is given physical definition, (2) resolution in the time dimension is improved, and a (3) a better display of the wide dynamic range of cardiovascular sound is attained. This method can do, or can be made to do, all the ear can, and can probably emulate the performance of the ear because 1) it is not wed to a particular frequency-intensity response curve, 2) it suffers from no "psychoacoustic" impediments, 3) it provides better resolution in the time dimension, and 4) it produces permanent, quantifiable records. Discussed here are selected features of mitral valve disease, aortic valve disease, gallops, systolic clicks, and extracardiac sounds. In general, intensity and peak frequency (or frequency range) vary in a parallel manner in sound of cardiovascular origin. Artefacts due to noncardiovascular ambient noise and to electrical interference can be identified and disregarded in the heart sound analysis.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The serum glutamic oxalacetic transaminase rose two to 20 times normal in 74 of 75 patients who had acute transmural myocardial infarction. The height of the enzymatic activity was roughly proportional to the size of the infarct. Serum glutamic oxalacetic transaminase is unaffected by angina pectoris, coronary insufficiency, heart failure, or digitalis in the absence of active heart cell injury. Experimental myocardial infarction is followed consistently by a two to twenty-fold increase in serum glutamic oxalacetic transaminase activity. Increase in the serum activity of this enzyme appears to be a useful index of the presence of active heart muscle injury.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The cold pressor test was performed three times at 15-minute intervals on 65 normotensive subjects and on 60 patients with essential hypertension both before and during treatment with antihypertensive drugs. The arterial pressure was recorded directly from the radial artery. On the basis of differences in the cold pressor response among individuals in the control group, the criteria for normal reaction and for hyperreaction were modified. The cold pressor response in the patients with essential hypertension was markedly depressed by the ganglionic blocking agents, but was not affected by various combinations of hydralazine, protoveratrine and reserpine.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Compensated cardiac patients, like normal subjects, on performing the Valsalva maneuver show a decrease in systolic, diastolic, and pulse pressures during the blowing effort and a characteristic hypertensive overshoot after the release of the strain. Cardiac patients in congestive failure show the "failure response" with a maintenance of the systolic, diastolic, and pulse pressures during the expiratory strain and an absence of the overshoot afterwards. Experimental and clinical observations in patients indicate that this "failure response" is due to elevation of the right ventricular diastolic pressure, which interferes with the normal obstruction of venous return during the blowing effort of the Valsalva maneuver.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Circulation times (P32from the antecubital and femoral veins to a peripheral artery) and roentgenographic studies of the pattern of venous distribution of a radio-opaque substance (Diodrast introduced through a cardiac catheter into the axillary vein and the inferior vena cava below the diaphragm) have been performed during the expiratory effort of the Valsalva maneuver. In normal subjects the circulation times were increased by the duration of the expiratory effort and the Diodrast injections were stagnated in the veins outside the thoracic cavity. These effects were in striking contrast to those in patients with congestive failure in whom the circulation times were retarded only partially if at all and the Diodrast injections continued to flow freely towards the right atrium during the expiratory effort. Thus, in patients with congestive failure the Valsalva maneuver does not interrupt the venous return to the right atrium as it does in normal subjects.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The brains of 20 patients with cerebral arteriosclerosis have been studied with regard to the exact mechanism of occlusion of the arteries in encephalomalacia. The histologic material has convinced the author that the concept of "cerebral thrombosis" in its present wide application is erroneous; there is arterial occlusion but the mechanisms of its production, which are discussed, are not the usually accepted ones.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Normal standards for ballistocardiogram amplitude have been estimated by statistical methods from a series of 194 healthy men and women. The application of new knowledge of the genesis of ballistocardiograms has resulted in normnal standards with a smaller scatter than those previously formulated, and so the ability to detect cardiac abnormality has been correspondingly increased.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The electrocardiographic patterns encountered in 28 patients with pulmonary hypertension secondary to chronic lung disease have been studied. Thirteen had neither right ventricular hypertrophy nor right bundle-branch block; eight had either right ventricular hypertrophy alone or right ventricular hypertrophy and right bundle-branch block (complete or incomplete); and seven had incomplete right bundle-branch block. A statistical comparison is made between these various groups of the means of the following physiologic measurements: mean pulmonary artery pressure, total pulmonary resistance, arterial oxygen saturation, right ventricular work, arterial carbon dioxide content, and cardiac index. The significance of the pattern of right ventricular hypertrophy is discussed.

ISSN:0009-7322    

出版商:OVID    

年代:1955

数据来源: OVID