What is "single coronary artery"?

Question

For tracing TOF after corrective surgery, i accepted some tests. Though MRI and Tl-201 test, my doctor told me i have "single coronary artery". i often feel pain in my chest, taking almost one bottle of NTG per month (and rare Isorsobide) . Several weeks ago, i went to ER for my chest pain and heart palpitations, doctor gave me Oxygen for few hours then pain disappeared. Till now, the pain has been controled.
Is it dangerous?

Answer 1

Single coronary artery means -

The entire coronary artery system may originate from a single ostium (solitary coronary ostium or single coronary artery) in the aorta. This solitary ostium is either located in the left or right coronary sinus of the aorta. When the LM coronary artery originates from the proximal RCA, or vice versa, the anomalous artery takes 1 of 4 aberrant pathways to reach its proper vascular territory. These pathways are type A (anterior to the right ventricular outflow tract), type B (between the aorta and pulmonary trunk), type C (through the crista supraventricularis portion of the septum), and type D (dorsal to the aorta).

Single coronary arteries may also include the separate origin of the LAD and LCx coronary arteries from the proximal RCA. In this case, the LAD coronary artery takes one of the type A, B, or C pathways, and the LCx coronary artery takes either the B or D pathway. The LCx coronary artery may also originate from the distal RCA. In that case, the LCx coronary artery is merely a continuation of the RCA in the posterior atrioventricular groove. Overall, a total of 20 possible variations of single coronary artery have been described.-

Answer 2

A single coronary artery is a rare congenital anomaly and, as an isolated finding, occurs in approximately 0.03-0.4% of the population. According to the site of origin and the anatomic distribution of the branches, isolated coronary arteries can be angiographically classified into different groups.

Answer 3

In my opinion "copy & paste" has given a good answer BUT since it's a Congenital anomaly; and you required Oxygen Inhalation, could be some Pulmonary problem, heart pain is not relieved by Oxygen alone. Probably Nitrates S/L might have been given to you; (can you recall it), an you have undergone Th201, test too.
Did you speak this to your consulting cardiologist, get a consultation as you are on nitrates as it is a matter of consideration, probably 10mg tds or qid!!?
Don't take any chances.OK