Does supraventricular ectopy increase one's risk of developing a cardiomyopathy?
Probably not. For PVCs, the association between PVC burden and LV dysfunction is pretty consistent in the literature. For PACs, there's not tons of data. I found one case report of a woman whose PAC burden was 21%; her EF went from 50% to 56% with ablation. And, I found the attached analysis, which is better data, showing that high PAC burden may be associated with increased risk of SVT and afib, but not clearly cardiomyopathy.
Gunda S, Akyeampong D, Gomez‐Arroyo J, et al. Consequences of chronic frequent premature atrial contractions: Association with cardiac arrhythmias and cardiac structural changes. Journal of Cardiovascular Electrophysiology. 2019;30(10):1952-1959. doi:https://doi.org/10.1111/jce.14067
