Fig. 2From: Dysphagia in the intensive care unit: epidemiology, mechanisms, and clinical managementThe four stages of swallowing (1 = oral preparatory stage, 2 = oral stage, 3–5 = pharyngeal stage, 6 = esophageal stage). Adapted from [139] with permission from the authors, copyright Heike Blum, University Hospital Münster, GermanyBack to article page