Approach to respiratory alkalosis Quiz: Ace Your Exams
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A 50-year-old woman is brought to the emergency department with a 2-day history of progressively worsening headaches, dizziness, and increasing confusion. Her family reports that she had complained of visual disturbances, including blurred vision, and seeing flashing lights. Her medical history is significant for hypertension, and she has been non-compliant with her medications. On arrival, her temperature is 36.8°C (98.2°F), heart rate is 82 beats/minute, blood pressure is 200/112 mm Hg, respiratory rate is 28/minute, and oxygen saturation is 100% on room air. On examination, she appears disoriented and has difficulty following commands. Neurological examination reveals bilateral papilledema and a positive Babinski sign bilaterally. Cardiopulmonary examination is unremarkable. Laboratory results are listed below. Which of the following additional tests should be performed next?
| Laboratory Test | Result |
| WBC | 7,500 /µL |
| Hemoglobin | 13.5 g/dL |
| Platelets | 250,000 /µL |
| Sodium | 138 mEq/L |
| Potassium | 4.1 mEq/L |
| Bicarbonate | 20 mEq/L |
| Calcium | 9.2 mg/dL |
| pH | 7.48 |
| PaCO2 | 32 mm Hg |
| PaO2 | 98 mm Hg |
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