A 17-year-old girl is brought to the emergency department by her parents because of dizziness and fatigue. Over the past 10 months she has restricted her food intake, exercises compulsively, and has lost 14 kg; she has had no menses for 6 months. She takes no medications and has no known allergies. On examination she is thin with fine lanugo hair on the forearms, and her BMI is 14.2 kg/m2 (about 68% of median for age). Laboratory investigations show potassium 3.3 mmol/L (3.5-5.0), phosphate 0.85 mmol/L (0.80-1.45) and magnesium 0.70 mmol/L (0.70-1.00). An ECG shows sinus bradycardia with a QTc of 430 ms.
| Heart rate | 42/min |
| Respiratory rate | 14/min |
| Temperature | 35.4 °C |
| O2 saturation | 99%, room air |
| Blood pressure | 86/54 mm Hg |
Question 1 of 6
Which of the following are the most appropriate initial management steps?
Select 2. (0 / 2 selected)
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