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Abstract
Three experimental methods are described which may be used to study the functions
of extracoronary anastomoses produced in the laboratory animal.
The first is the choice of a pedicled skin flap as the vehicle to bring systemic blood
vessels to the surface of the heart. Extracoronary anastomoses formed with the vessels
of this tissue are more easily studied than those formed with other tissues, and the
procedure is simple to carry out.
The second is a way to produce slow complete occlusion of a coronary artery without
reoperation. This is accomplished by the use of a stainless steel clip which is closed
by a spring and is held open by catgut which slowly absorbs after the clip is placed
in the tissues.
The third is a technique for determining the direction of blood flow through extracoronary
anastomoses in the living animal, and it consists of a comparison of the times required
for blood to reach the coronary sinus by the normal route and by a shorter route through
the anastomoses.
Using these methods we have occluded up to 80 per cent of the coronary arterial supply
in animals protected by flaps, and present evidence suggests that the extracoronary
source of blood was not responsible for their survival. The findings neither prove
nor disprove the value of extracoronary anastomoses, but merely indicate the extent
to which the normal heart is capable of protecting its blood supply, following slow
occlusion. This method of occlusion requires nearly total coronary artery closure
before simulating coronary disease in the human being, and further studies in this
direction are being carried out.
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Article info
Footnotes
☆Read at the eighth annual meeting of the Society for Vascular Surgery, San Francisco, June 20, 1954.
Identification
Copyright
© 1955 Published by Elsevier Inc.