Origin of Downstream Flow in Nonobstructed Coronary Arteries
| Autor: | John B. Overton, Merrill P. Spencer, Peter B. Mansfield, Lester R. Sauvage, James C. Smith, Stephen B. Robel |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
medicine.medical_specialty
Aorta Thoracic Bypass grafts Models Biological Transplantation Autologous Veins Basal (phylogenetics) Dogs Thoracic Arteries Coronary Circulation medicine Animals Circumflex Thoracic artery Coronary Artery Bypass Leg business.industry Total flow Arteries Coronary Vessels Surgery Coronary arteries surgical procedures operative medicine.anatomical_structure Regional Blood Flow business Mathematics Artery |
| Zdroj: | Archives of Surgery. 107:764 |
| ISSN: | 0004-0010 |
| DOI: | 10.1001/archsurg.1973.01350230116021 |
| Popis: | Various sizes of veins and internal thoracic arteries were grafted into unobstructed circumflex coronary arteries in 28 dogs. Grafts did not increase total flow to the distal bed. Flow percentage originating from the graft was compared to the ratio of cross-sectional areas of graft to coronary artery. Results were compared to a theoretical model of the bypass system. With cross-sectional ratios of 1.2:1 and 1.5:1, the graft captured 70% and 85%, respectively, of distal flow; at 1:1 50% and 0.5:1, only 20%. With the coronary artery temporarily occluded, even 0.5:1 grafts handled the basal flow. However, flows two to four times the basal level were carried fully only by grafts of 1.2:1 or greater; smaller grafts carried less—up to 30% reduction at 0.5:1. Length of graft, as well as shape (tapered or not), is considered in applying ratios. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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