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Representative polygraphs from the noninvasive ventilation protocol depicting the difference in apneic threshold (AT) in a single spinal cord injury subject between the placebo-treated (A) and acetazolamide-treated (B) arms. Eupneic is represented by the upper dashed line of the bracket, and the AT is represented by the lower dashed line of the bracket. VT, tidal volume; , end-tidal CO2 partial pressure; Pmask, mask pressure.
