1. Volume 31, Issue 3, Pages 243-252 (March 1957)
Symposium on Coronary Artery Disease Blood Supply to Ischaemic Myocardium Distal to the Occlusion of a Coronary Artery 
CLAUDE S. BECK, M.D., F.C.C.P. 
Diseases of the Chest 
Volume 31, Issue 3, Pages (March 1957)
DOI: /chest
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

2. FIGURE 1A
Normal dog hearts with descending coronary artery injected in red and the circumflex and right coronary arteries injected in white. This material is thick and does not penetrate capillaries. —Figure 1A shows the anterior view of a heart
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

3. FIGURE 1B
shows the area between descending artery and circumflex artery.
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

4. FIGURE 1C
shows the area between descending artery and right artery. The communications between these arteries in the normal heart are sparse. The same holds true for the human heart. Only nine per cent of normal hearts show intercoronary arterial communications.
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

5. FIGURE 2A
Dog hearts after operation.—Figure 2A shows the area between the descending and circumflex arteries. Both arteries are injected in white.
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

6. FIGURE 2B
shows the same view, except the circumflex artery was injected in red.
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

7. FIGURE 2C
shows the posterior view. The descending artery was injected in red and the circumflex and right in white. The descending cannot be seen, but its branches communicated freely with the circumflex artery over the apex. An injection mass enters the circumflex artery from the descending. Intercoronary communications are seen in each of these specimens.
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

8. Figure 3
Human heart. This patient had severe coronary artery disease and was operated upon. He was rehabilitated so that he could return to work without pain for nine months. Pain then recurred and he died after another three months. The arteries are injected in white. The descending artery is completely obliterated at its origin. The circumflex artery also shows disease. Figure 3A shows the anterior view and Figure 3B shows the posterior view. Three branches from the right are occluded and it is probable that this area produced pain, electric currents, and death. Note the intercoronaries over the auricles as well as over the ventricles. The result in this patient was classified as good or excellent. Operation does not presume to cure coronary artery disease.
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions

9. FIGURE 4
Mautz-Gregg backflows.9 The circumflex artery is ligated at its origin and cut distal to the ligature. A catheter is inserted into the distal end and the amount of blood obtained is the back-flow. It is an indication of the amount available to the ischaemic myocardium beyond the occlusion. The sketch on the left indicates the average amount per hour obtained in 67 normal dog hearts. The sketch on the right indicates the average amount per hour obtained in 41 dogs' hearts after the operation had been done some time previously. Operation added 282 cc. per hour to the amount normally present. This is comparable to a transfusion of red blood into this ischaemic area and this additional blood is available at the crisis of arterial occlusion.
Diseases of the Chest  , DOI: ( /chest )
Copyright © 1957 The American College of Chest Physicians Terms and Conditions