Familial hypoparathyroidism, Family history of

 

presents to the emergency department in January with a six-day history of a worsening productive cough, runny nose, shortness of breath, and high-grade fever.

His past medical history is significant for having measles and pertussis ten years ago. He is not vaccinated. His vital signs are blood pressure 120/80 mmHg, heart rate 110 beats/min, respiratory rate 24 breaths/min, and oxygen saturation 97% on room air. Further examination reveals a positive Trousseau sign. Blood work is significant for an elevated white blood cell count with a left shift, elevated lactate, and a low calcium level. During measurement of which vital sign was the Trousseau sign observed?

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