“…The majority of studies, 16, described syncopal episodes of unexplained etiology (Romero-Sánchez et al, 2020, Pérez et al, 2020, Chachkhiani et al, 2020, Xiong et al, 2020, Radmanesh et al, 2020, Chuang et al, 2021, Pérez et al, 2020Mizrahi et al, 2020, Martín-Sánchez et al, 2020, Travi et al, 2020, Argenziano et al, 2020, Gonfiotti et al, 2020, García-Moncó et al, 2020, Chen et al, 2020, Lam et al, 2020, Chou et al, 2021. 10 case reports alluded to possible cardiac etiology for syncope (Sang et al, 2020, Pasquetto et al, 2020, Luetkens et al, 2020, Chang et al, 2020, Khan et al, 2020, Chalela et al, 2020, Chibane et al, 2020, Pendower et al, 2020, Aoi et al, 2020, Doodnauth et al, 2021 as well as 1 case series (Espinoza et al, 2021), while another 6 studies attributed the cause of syncope to orthostatic hypotension (Ebrille et al, 2020, Tapé et al, 2013, Logmin et al, 2020, Singhania et al, 2020, Huang et al, 2020, Omotosho et al, 2021. In turn, reflex syncope was highlighted in only 3 of the studies (Ebrille et al, 2020, Canetta et al, 2020, Birlutiu et al, 2020.…”