A 14-year-old girl is brought to the Emergency Department with a 20-minute history of difficulty breathing that started during a school assembly. She has had similar symptoms 3 times in the last 2 weeks. These episodes develop rapidly and resolve gradually over several minutes. She reports tingling in her fingers and toes. On examination, her vital signs are as follows:
Blood pressure
120/80 mm Hg
Heart rate
100/min
Respiratory rate
22/min
Oxygen saturation on room air
95%
Temperature
36.9 °C, orally
Apart from mildly dilated pupils, her examination is otherwise normal. Which one of the following is the most likely diagnosis?
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