Ultrasound as Diagnostic Tool in Diaphragm Dysfunction

The diaphragm is the main muscle for inspiration and vital for ventilation. Multiple diagnostic modalities can be performed in the work-up of suspected diaphragm dysfunction. Fluoroscopy has traditionally been the method of choice in diagnosing diaphragm paralysis and is still widely used in clinical practice, while alternative non-invasive and accessible methods have been available. Superiority of ultrasound over fluoroscopy for the diagnosis of diaphragm dysfunction has been suggested. The primary objective of this study is to investigate the construct validity of ultrasound in diaphragm paralysis.