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[The coronary collateral system in man]
1Catedra de Anatomie, Facultatea de Medicină, Universitatea de Medicină şi Farmacie Gr. T. Popa, Iaşi.
Insights
The study highlights the coronary artery anastomotic network, crucial for basic heart function but inefficient during high oxygen demand. Developed collateral circulation can improve blood flow and reduce heart wall issues after coronary obstruction.
Area of Science:
- Cardiovascular Science
- Medical Imaging
Background:
- The coronary arteries possess an anastomotic network that supports basic myocardial activity.
- This collateral system becomes insufficient during periods of increased oxygen demand.
- The functional significance of these anastomoses, particularly smaller ones, in overall cardiac perfusion is limited.
Purpose of the Study:
- To investigate the anastomotic network between the two coronary arteries.
- To confirm the presence and characteristics of the coronary collateral system.
- To evaluate the impact of developed anastomosis on cardiac function and pathology.
Main Methods:
- In vitro coronary angiography using Barium Sulfate (BaSO4) as a contrast agent.
- Examination of necroptic specimens to confirm the anastomotic system.
- Combined echography and angiography studies (1992) to assess functional changes.
Main Results:
- The existence of anastomoses between branches of the same or different coronary arteries was confirmed imagistically and histologically.
- Collateral branches with diameters ≤ 40 µm play a minor role in normal cardiac perfusion.
- Coronary artery obstruction stimulates the development of these anastomoses within weeks, evidenced by increased blood flow.
- Developed collateral circulation was shown to decrease the frequency of myocardial wall motion abnormalities distal to an obstruction.
Conclusions:
- The coronary anastomotic network, while present, has limited capacity during high cardiac demand.
- Development of collateral circulation in response to coronary obstruction is a significant adaptive mechanism.
- Enhanced collateralization can mitigate the adverse effects of coronary artery disease on myocardial function.
Abstract:
The aim of this work is to stand out the anastomotic network between the two coronary arteries. This satisfies the basic myocardiac activity, but it becomes inefficient in an increased cardiac consumption of oxygen. The anastomotic collateral system was confirmed imagistically and by necroptic pieces. The coronarographs in vitro, using BaSO4 as a contrast substance, proved the existence of anastomosis between branches emerging from the same coronary artery or from both sources. In human body, these collateral branches with a diameter less or equal to 40 m have a minor role in cardiac perfusion economy. In case of obstruction of a thick coronary branch, the anastomosis will develop in a few weeks; that is confirmed by the increase of blood-flow at this level. Combined studies of echography and angiography (1992) proved that developed anastomosis induce a decreased frequency of pathological cases related to the dynamics of the myocardiac wall at a lower level from the obstruction.