Quote from cardiodiot
RCA supplies SAN.
This is a good point. However, the RCA doesnt always feed the SA-node...so to make this blanket statement is a bit misleading. Also, the chances of an RCA/inferior MI knocking out the SA-node are small(real...but small). In contrast, the potential for RV involvement is much higher (~40-50%)...and i beleive this is from where the OP's question stems...because these RV MI's are harder to treat with 'standard' meds (ie nitro).
(...And the potential for blocks and lethal arrhythmias can just as easily stem from the left coronary system...)
Again, i think the question is loaded and that it's all relative.
Is the vessel dominant? Is the occlusion proximal? Distal? Any collateral circulation? etc.
Whoever thinks an RCA lesion is worse than a left-main lesion (for example)(because you 'could potentially knock-out the SA-node') would be hard pressed to convince me. Forget the SA node, if you shut down the Left main the patient's done.
I think the OP's teacher (or text-book) could have better phrased the question as "...what are some potential complications of right coronary artery MI's..."
Sure..they can be very bad and lethal(duh)...but so can left coronary occlusions(ummm duh again)...for various reasons.