摘要:

The shape of dilution curves obtained by sampling from different sites was studied in dogs following superior vena caval injections of dye. Synchronous sampling from paired sites enabled observations to be made on the separate effects of the right heart, left ventricle and aorta on the dye dilution curves, with and without mitral insufficiency.The results show that tile left ventricle and aorta have little effect on the final slope of a dilution curve across the lungs in dogs with normal hearts. In the presence of mitral incompetence the final slope across both lungs and heart was slower than in the normal, but these changes were related to cardiac output and increase in lung mixing volume rather than primarily to the incompetence of the valve.

ISSN:0009-7330    

出版商:OVID    

年代:1959

数据来源: OVID

摘要:

Blood pressures have been taken from the carotid and femoral artery in sheep following experimental coarctation of the aorta at about the level of the ligamentum arteriosum. Systolic, diastolic, mean, and pulse pressures have been recorded at intervals of from 3 to 6 months over a period of as long as 3 years in some cases. Unoperated sheep have been used as controls. The main changes are a rise in all the carotid pressures and in the femoral diastolic, a fall in the femoral systolic and pulse pressures, and no significant change in the femoral mean pressure. These changes in hemodynamics resulting from coarctation may be adequately explained by the mechanical effects of the coarctation. Over a period of 3 years there is a slight rise of blood pressures in both the normal and the coarctated sheep.

ISSN:0009-7330    

出版商:OVID    

年代:1959

数据来源: OVID

ISSN:0009-7330    

出版商:OVID    

年代:1959

数据来源: OVID

ISSN:0009-7330    

出版商:OVID    

年代:1959

数据来源: OVID