“…These studies are relatively recent, published between 2005 [21] and 2018 [61]. Except one prospective study [58], the remaining 10 studies adopted a retrospective design [19][20][21]45,48,56,57,[59][60][61]. Two studies [20,21] grouped patients based on PVC burden; three other studies [58,60,61] grouped patients into two -those with and those without structural heart diseases, while the remaining six studies compared PICM patients with LV dysfunction) and control (those with PVC but without LV dysfunction) [19,45,48,56,57,59].…”