A 29-year-old man wearing a skydiving jumpsuit was transported by private vehicle to our emergency department from the drop zone of a local airport. He was able to walk to the front desk, where he complained of dizziness, headache, and nausea. The man was neurologically intact and had a Glasgow Coma Scale score of 15. Vital signs were as follows: blood pressure, 151/76 mm Hg; respiratory rate, 20 breaths/min; and heart rate, 68 beats/min. The patient was normothermic, and room air oxygen saturation was 98%. The most striking thing about this patient was his unusual appearance. The man's face was tinged blue with a prominent line of demarcation just below the nose. Above the line, his face had a distinctly bluish discoloration (Figure 1).
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