A 7-year-old male presents with severe diarrhea and vomiting…

A 7-year-old male presents with severe diarrhea and vomiting of 3 days’ duration. He is anxious, tachypneic, and has a systolic blood pressure of 90 mm Hg. Further assessment reveals that he has weak and rapid radial pulses, but a strong carotid pulse. This child’s clinical condition is most consistent with: