Double Right Coronary Artery Originating from Separate Ostia: A Report of Two Cases

Morphometry and topography of the coronary ostia in the dog

Introduction

The purpose of this study was to perform a morphometric examination of the coronary ostia, including their location in the area of the aortic sinuses, and to describe variations in ostia structure in the domestic dog.

Material and Methods

The study was conducted on the hearts of 91 pedigree dogs of both sexes, aged 1 to 18 years (median 9 years), with a body weight from 1.2 to 65 kg (median 20.7 kg). Morphometric examinations of the coronary ostia were performed in the studied individuals, and the location of the structures in relation to the intercommissural lines was determined.

Results

Three types of location of the coronary ostia were distinguished, i.e. below the intercommissural line (type I), on the intercommissural line (type II), and above the intercommissural line (type III). In the studied dogs, the most common location of the ostia was type I - found in the left coronary artery of 74/91 dogs (81%) and in the right coronary artery of 42/91 dogs (46%). Morphological variations were shown in 36/91 dogs (40%) in the structure of the coronary ostia, including the presence of accessory ostia. The most common variation was the presence of an accessory ostium near the ostium of the right coronary artery, which was found in 28/91 dogs (31%).

Conclusion

The results may be useful in developing standards for procedures to replace the whole or part of the aortic valve and repair the coronary artery.

Dual right coronary artery: an unconventional presentation from Pakistan

There is a significant variation in the mapping of epicardial coronary arteries. This variation may present as different anomalies. These anomalies are usually asymptomatic and can be present at birth. Some might become symptomatic during adulthood and subsequently, result in sudden death. The anomalies, in turn, present a challenge to clinicians during therapeutic intervention. Therefore, there is a growing need to have knowledge about the various forms of the coronary artery anomalies. In our case report, we present the case of a patient who had one such anomaly and provide a hint at one strategy that was used to tackle the challenge.

Double right coronary artery in primary PCI: Finding the hidden treasure…

Double Right Coronary Artery (RCA) is one of the rarest congenital coronary anomalies. Although it can be regarded as a benign condition in the vast majority of cases, it has been associated with acute and life-threatening presentations, including inferior ST-segment elevation myocardial infarction (STEMI), cardiogenic shock and complete heart block, tachyarrhythmias, or even sudden death. However, the role of a double RCA in these conditions is yet to be clarified as more recent data prove no statistically significant association between prevalence of significant atherosclerosis in anomalous coronary arteries in comparison to normal coronary arteries. Here we present a case of inferior STEMI in the context of double RCA, in which one of the two component branches was accidentally found after an "unexpected" jump of the coronary guidewire to treat what was initially considered the main vessel.