A 52-year-old man undergoing elective abdominal surgery develops sudden hypotension (BP 85/50 mmHg) and SpO₂ 88% on FiO₂ 0.4 at 30 minutes post-induction. Breath sounds are present bilaterally. Which single clinical feature best distinguishes intraoperative hypoxia due to hypovolemia from that due to acute airway obstruction?

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