Do you use sitting vs supine spirometry to consider tracheostomy in a patient with Amyotrophic Lateral Sclerosis?

The decision to pursue tracheostomy is becoming less of a choice altogether in our practice. However, to answer your question once my patients are on NIPPV I don't routinely subject patients to supine spirometry for prognostic follow-up, given the high risk-benefit ratio of transferring a patient wi...