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Abstract
The carotid artery of a dog may be constricted to a considerable degree before the
blood flow is reduced significantly. The results may be given in terms of the reduction
in external diameter, internal diameter, or area of lumen. The external diameter of
a blood vessel (5 mm. in diameter and with a wall 0.325 mm. thick) may be reduced
40 per cent without a significant reduction in blood flow, but, if the external diameter
is reduced 60 per cent, the blood flow is reduced 49 per cent. On the other hand,
the internal diameter can be reduced 70 per cent before a 50 per cent reduction in
blood flow takes place. The data are most striking when stated in terms of the area
of the lumen. The area of the lumen may be reduced 50 per cent without any change
in blood flow, and it can be reduced as much as 90 per cent before a 50 per cent reduction
in blood flow occurs.
The data were obtained with constricting units of not more than 1 cm. in length.
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References
- A Double Perfusion-Pump.J. Physiol. 1928; 64: 356-364
- The Thermo-Stromuhr Method of Measuring Blood Flow.Physics. 1931; 1: 407-417
Article info
Publication history
Received:
May 5,
1938
Footnotes
☆Read before the meeting of the Western Surgical Association, Indianapolis, Ind., Dec. 3 and 4, 1937.
Identification
Copyright
© 1938 Published by Elsevier Inc.
