Brachycephalic syndrome occurs because of a compressed and redundant airway in two short a skull in brachycephalic individuals. By definition, a brachycephalic skull is one in which the width to length ration is greater than 0.81. Just like the skin, the amount of soft tissue within the airway is not reduced proportionally to the shortening of the bone. Similarly, the amount of oxygen needed is function of body size and not skull length.

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