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A​ 24-year-old female was an unrestrained driver of a car that struck a​ guardrail, causing her to sustain blunt trauma to the chest and abdomen. Vitals obtained by Emergency Medical Responders​ (EMRs) are pulse​ 120, respirations​ 22, blood pressure​ 100/58 mmHg, and SpO2​ 96%. As you transport her to the​ hospital, what finding indicates that the patient is acutely​ deteriorating?