Diaphragmatic Dysfunction Is Characterized by Increased Duration of Mechanical Ventilation in Subjects With Prolonged Weaning

Ultrasonography image of the right hemidiaphragm obtained in zone of apposition with (A) and without labeling (B). The diaphragm can be identified as a 3-layered structure superficial to the liver, consisting of pleural and peritoneal membranes and the muscle itself. In B, crosses indicate the thickness of the diaphragm.