ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

A fieldplotting tank which has a negligible boundary error is described. A comparison between measurements made in this tank and a conventional tank shows graphically the effect of a finite boundary. It is shown that the field of two halfshells is identical to a source-sink field at remote points. The method of electrical images for solving boundary-value problems is presented.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Quantitative results of a critical experiment designed to determine influence of human-body inhomogeneity and applicability of fixed-location dipole hypothesis for ventricular depolarization are presented. Results reflect in pictorial form, conclusions that the fixed-location dipole representation is approximately 95 per cent accurate for the QRS complex at any body-surface point; influence of inhomogeneities on surface potentials is roughly ±10 per cent.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Right heart failure was produced in dogs by controlled progressive stenosis of the pulmonary artery. Cardiac enlargement, systemic venous engorgement, tachycardia, hepatomegaly and ascites were consistent findings. The course of cardiac failure was characterized by continual changes in cardiovascular hemodynamics; either cardiac decompensation became progressively severe or circulatory function improved and diuresis resulted. Sodium (Na) retention was always associated with high central venous pressure. Cardiac output was reduced during Na retention except during spontaneous anemia superimposed on cardiac failure. Glomerular filtration rate was frequently normal at the onset of cardiac failure.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Acute and chronic responses to digoxin have been studied in dogs with cardiac failure secondary to constriction of the pulmonary artery. Cardiovascular and renal hemodynamic function improved and, frequently, a striking increase in sodium (Na) excretion resulted. The data suggest a direct myocardial action of digoxin and provide evidence of impaired myocardial function similar to that observed in patients with congestive heart failure.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Following complete or nearly complete hypophysectomy in dogs with thoracic inferior vena cava constriction, a striking increase in sodium (Na) excretion occurred concomitant with a fall in femoral venous pressure. The previously high venous pressure and renal Na retention were restored by administration of thyrotropin (TSH), growth hormone injection or further constriction of the thoracic inferior vena cava, but adrenocorticotropic hormone (ACTH) was without effect on these functions. The data indicate that pituitary hormones influence the accumulation of ascitic fluid by contributing to the maintenance of an adequate level of venous hypertension.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The effects of bound ouabain on the electrogram of the isolated frog heart are antagonized by epinephrine and potentiated by calcium. Ouabainized hearts also develop increased ventricular automatism (paroxysmal tachycardia, flutter and fibrillation) in the presence of large concentrations of calcium but not of epinephrine. The actions of both epinephrine and calcium are readily reversed by washing the tissue with normal Ringer's solution.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

The influence of alterations of adrenal function upon the responsiveness of the rat to intravenously administered ouabain was studied electrocardiographically by the string galvanometer. Conduction disturbances followed by cardiac arrest were the criteria for a definitive response. Adrenalectomized rats showed a significant increase in sensitivity to ouabain as compared with normal controls. Normal animals implanted with pellets of desoxycorticosterone acetate and continuously maintained on saline drinking water did not show a significant alteration in their responsiveness to ouabain.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Comparative studies of peripheral blood and bone marrow have shown that the postoperative marked and sustained reduction of blood platelets is accompanied by a block in the mechanism of delivery of platelets into the blood stream and a delay in maturation of blast cells of the megakaryocyte lineage.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID

摘要:

Diphenylhydantoin sodium, glucose, and β-diethylaminoethyl diphenylpropylacetate hydrochloride were tested for their effects upon the cyclopropane-epinephrine arrhythmias. Diphenylhydantoin in a small dose enhanced the arrhythmias and in a larger dose controlled them when given by vein, but its action following oral administration was uncertain. Glucose increased both the duration and the severity of ventricular ectopic rhythms while β-diethylaminoethyl diphenylpropylacetate increased the dose of epinephrine which initiated them.

ISSN:0009-7330    

出版商:OVID    

年代:1955

数据来源: OVID