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Figure 1. A 39-year-old woman who had a small-bowel obstruction after resection of an appendiceal carcinoid tumor was given benzocaine topical spray for retropharyngeal discomfort from a nasogastric tube. Within minutes, she became ashen, dyspneic, and tachypneic, with an oxygen saturation of 73 percent on pulse oximetry while breathing room air. Administration of 100 percent oxygen by face mask resulted in the following arterial-blood gas values: a pH of 7.46, a partial pressure of carbon dioxide of 41 mm Hg, a partial pressure of oxygen of 507 mm Hg, an oxygen saturation of 84 percent, a methemoglobin level of . . . [Full Text of this Article] |
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