The patient received 1 liter normal saline and diltiazem (a total of 20 mg intravenously and 30 mg orally) in the emergency department. Emergency department personnel made several attempts to place a nasogastric tube for gastric lavage, but were unsuccessful. During her evaluation, the patient was noted to desaturate to 80% on room air, with an increase in her respiratory rate to 34 breaths per minute. She was administered 50% oxygen by nonrebreadier mask, with improvement in her oxygen saturation to 89%. Computed tomographic angiography was negative for pulmonary embolism. 