The seal between the mask and the face is critical for drug delivery. If the mask doesn’t fit tightly enough, you’re sucking in air from outside the mask that contains no medicine.

The American economic system rewards those who take great risks with commensurate benefits. The compensation Mr. Brooks received is directly attributable to the risk he undertook in aiding the capitalization of DHB and achieving extraordinary...

Dead space volume in the mask contains drug that doesn’t get into the lung with each breath.

With some masks, the amount of medicine available to the youngest children is severely decreased because of mask size, stiffness, and poor fit on the face.