High take-off of the coronary arteries is a rare cardiac anatomic anomaly, which may occur independently or with other congenital heart defects. In the clinical setting, it is noteworthy as a cause of sudden cardiac death. Further, it is vital to identify such anomalies to avoid intraoperative catastrophes in surgeries for congenital heart defects.


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Ectopic right coronary artery with high take-off: technical challenges during percutaneous coronary revascularisation
Ektopowe, wysokie odejście prawej tętnicy wieńcowej — problemy techniczne w trakcie przezskórnej rewaskularyzacji wieńcowej

https://www.researchgate.net/publication/329633464_Ektopowe_...

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Anomalous coronary arteries, especially when they are right with a high take-off, are challenging substrates for percutaneous
coronary intervention (PCI).


Streszczenie
Anomalie dotyczące tętnic wieńcowych, zwłaszcza wysokie odejście prawej tętnicy wieńcowej (RCA), wiążą się z trudnościami
w trakcie przezskórnej interwencji wieńcowej (PCI).

https://journals.viamedica.pl/folia_cardiologica/article/dow...

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Note added at 2 hrs (2021-05-06 20:23:11 GMT)
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A “high takeoff” is variably defined in the literature. Some authors classify any coronary artery with its origin above the sinotubular junction as anomalous. However, this definition appears to be inappropriately broad, because it includes many anatomically normal variants. Other authors restrict the definition of high takeoff to ostia that are more than 1 or 2 cm above the sinotubular junction. The highest reported origin of a coronary artery has been 5 cm above the sinotubular junction, in a case involving a right coronary artery.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3423280/#:~:tex...