Levosimendan off-label successfully used in two patients with exacerbated COPD and severe bronchospasm: a case series focusing on an explorative review of the current literature. Adv Anest Pain Med [Internet]. 2023 Nov. 17 [cited 2025 Jun. 14];1(1). Available from: https://www.aapm-journal.com/site/article/view/36