In other words, are there atrial analogues of ventricular couplets, triplets/salvos and NSVT?
From what I've gathered by looking at medical websites, you could at most have something that resembles an atrial couplet or triplet in the context of atrial fibrillation, but not an isolated event in the absence of a-fib. I have not seen any legitimate websites that describe isolated atrial couplets, triplets and longer bursts. If atrial couplets, triplets or NSAT (non-sustained atrial tachycardia) do not happen in isolation (or in the absence of a-fib), why not?