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Functional dominance of the right coronary artery: incidence in the human heart
C E Nerantzis1, J C Papachristos, J E Gribizi
1Pathology Department, University of Athens, Greece.
Insights
This study reveals a specific type of right coronary artery dominance in 19 human hearts, termed "real right dominant" (RRD). RRD arteries supply significant portions of both ventricles, impacting ischemia and mitral function.
Area of Science:
- Cardiovascular Anatomy
- Human Cardiac Morphology
Background:
- The dominance of the right coronary artery (RC) is a key anatomical variation.
- Understanding variations in coronary artery supply is crucial for diagnosing and treating cardiac conditions.
Purpose of the Study:
- To identify and characterize a specific subgroup of right coronary artery dominance.
- To investigate the anatomical features of the "real right dominant" (RRD) coronary artery system.
- To correlate RRD anatomy with potential clinical implications.
Main Methods:
- Radiopaque medium injection into 200 human hearts.
- Direct observation and X-ray analysis of coronary artery anatomy.
- Measurement of diameters and lengths of RC arteries in RRD and typical right dominant hearts.
Main Results:
- Right coronary artery (RC) dominance was observed in 178 out of 200 hearts.
- A subset of 19 hearts exhibited "real right dominant" (RRD) anatomy, with RC supplying a large posterior interventricular artery (LPIV) and a large extension of the right coronary (LERC).
- In RRD hearts, the RC supplied the right ventricle and nearly half of the left ventricle.
Conclusions:
- The RRD coronary artery pattern has significant implications for myocardial perfusion.
- Proximal RC lesions in RRD hearts may lead to extensive posterolateral ischemia and mitral dysfunction.
- These anatomical findings are clinically relevant for angioplasty and bypass surgery planning.
Abstract:
After injection of radiopaque medium, 200 human hearts were studied by direct observation and x-ray analysis. The right coronary artery (RC) was dominant in 178 of these hearts as characterized by giving off the typical posterior interventricular artery (PIV), the posterior descending artery. Within this group, 19 specimens had right coronary arteries that gave off both a large posterior interventricular artery (LPIV) and a branch that continued beyond the crux termed a large extension of the right coronary (LERC). The subgroup of hearts supplied thusly was termed real right dominant (RRD). The RC in these hearts supplied the right ventricle and almost half of the left ventricle. These findings explain why proximal lesions of the RC in RRD hearts can be associated with extensive posterolateral ischemia and mitral dysfunction and should be of practical importance when considering angioplasty or by-pass surgery. The diameters and lengths of the arteries of the RC in RRD hearts were measured and compared with the same parameters in typical right dominant hearts.