Apparently, the 180 patient study recruited 52 patients . . . ?
 

I think this study was to involve 180 patients but they stopped recruiting when the recruitment period ended . . . qualifying for this study seems very hard . . . if I understand the qualifications correctly, to enter the study patients must be about to lose qualification for pacer implantation but still qualify and not already be implanted. Where it might have said 180, it now says 52, wherefrom I derive the hypothesis they changed the number to the number they actually admitted.

Diaphragm Pacing System (DPS) In Participants With Amyotrophic Lateral Sclerosis (ALS) - Full Text View - ClinicalTrials.gov