“…Single-case studies present advantages, such us they enable methodological advances, especially in the case of observational studies ( Kitzmiller, 2010 ; Arias-Pujol et al, 2022 ). Additionally, the polar coordinate analysis proposed has been used in recent years in various fields, such as clinical psychology ( Rodríguez-Medina et al, 2018 ; del Giacco et al, 2020 ; Arias-Pujol et al, 2022 ), occupational health ( Portell et al, 2019 ), classroom activities ( Belza et al, 2019 ), sports ( Maneiro et al, 2020 Iván-Baragaño et al, 2023 ), and conflict mediation ( Alvarado-Alvarez et al, 2021 ). However, the context in which this single-case study ( Sandelowski et al, 2009 ; Anguera, 2018 ; Arias-Pujol et al, 2022 ) was developed, a hospital ED, is totally new.…”