Do you favor the use of maximal inspiratory/expiratory pressure measurement or supine spirometry in the evaluation of a patient with suspected respiratory muscle weakness?

In practice, we often perform both in the same session. Supine spirometry has the advantage of assessing the orthopnea that is a common complaint among my patients with neuromuscular disease. Also, many of our patients report that the MIP/MEP maneuver is difficult to perform and they feel it underestimates their ability. So, I tend to use these measurements for different purposes. In a patient with known neuromuscular disease and symptoms that will likely benefit from noninvasive ventilation, a ...