Validation of the "ExSpiron©" in Patients With ALS

Non-invasive ventilation (NIV) in patients diagnosed with amyotrophic lateral sclerosis (ALS) is nowadays common practice to provide comfort at the end stage of the disease. As complaints vary there is the need of a non-invasive device to measure respiratory volume to objectify complaints. The ExSpiron© is a device for non-invasive monitoring of respiratory volume. The validation of this monitor in patients with ALS is the aim of this study. The hypothesis is that the ExSpiron© delivers a valid assessment of respiratory volume in patients with ALS