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]. 2025 Aug. 1 [cited 2025 Aug. 5];1(1). Available from: https://www.aapm-journal.com/site/article/view/36