A 35-year-old man with asthma presents with acute exacerbation. His baseline FEV₁ is 70% predicted. On examination, he has audible wheeze bilaterally and uses accessory muscles. Pulse oximetry shows SpO₂ 88% on room air. Which feature best distinguishes acute severe asthma exacerbation from acute life-threatening asthma exacerbation?

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