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Coronary collateral circulation in the pig: correlation of collateral flow with coronary bed size
Insights
Pigs have uniform coronary bed sizes, but collateral circulation varies significantly among the left circumflex, left anterior descending, and right coronary arteries. This study quanties these differences in coronary blood flow.
Area of Science:
- Cardiovascular Science
- Comparative Anatomy
- Physiology
Background:
- The coronary arteries (left circumflex, left anterior descending, and right coronary) supply blood to the heart muscle.
- Understanding the distribution of coronary beds and collateral circulation is crucial for diagnosing and treating heart conditions.
Purpose of the Study:
- To measure and compare coronary bed sizes in pigs.
- To quantify collateral circulation within the three main coronary artery beds.
- To investigate potential differences in collateral flow between these beds.
Main Methods:
- Coronary bed sizes were determined in pigs.
- Collateral circulation was measured using tracer microspheres in the left circumflex, left anterior descending, and right coronary artery beds.
- Measurements of transmural collateral flow were recorded in milliliters per minute per 100 grams (ml/min/100 g).
Main Results:
- Coronary bed sizes were found to be relatively uniform across pigs.
- The left anterior descending (LAD) bed occupied approximately 31%, the right coronary (RC) bed 38%, and the left circumflex (LC) bed 31% of the heart.
- Transmural collateral flow varied significantly: LC (5.6 ml/min/100 g), RC in the left ventricle (LV) (3.7 ml/min/100 g), RC in the right ventricle (RV) (4.3 ml/min/100 g), and LAD (1.0 ml/min/100 g).
Conclusions:
- While coronary bed sizes are similar in pigs, collateral blood flow demonstrates significant regional differences.
- These findings highlight the heterogeneity of collateral circulation within the porcine heart, with implications for understanding myocardial perfusion.
Abstract:
Coronary bed sizes were measured in pigs. The left anterior descending bed occupies about 31% of the heart, the right coronary bed about 38% of the heart and the left circumflex bed about 31% of the heart is (including atria). The right coronary artery supplies about 81% of the right ventricle and 23% of the left ventricle with its blood supply. The remaining portion of the right ventricle is supplied by the LAD. The collateral circulation was measured in each of the 3 coronary beds using tracer microspheres. Measurements, are in ml/min/100 g. Transmural collateral flow in the LC is 5.6, the LAD 1.0, the RC in LV 3.7 and the RC in RV 4.3. Our experiments showed that the coronary bed sizes were relatively uniform in pigs, but that collateral flow was significantly different between the beds.