An adult client is transported via ambulance to the emergency department (ED) following a motor vehicle collision. On arrival the client reports experiencing severe upper back pain. The vital signs are a temperature of 98.6° F (37° C) orally, heart rate 145 beats/minute, respirations 26 breaths/minute, and blood pressure 70/40 mm Hg. Which change in assessment findings indicate that the client's condition is deteriorating?

Rationale: A. Heart rate of 40 beats/minute: A sudden drop in heart rate following initial tachycardia in a trauma client with hypotension may indicate neurogenic shock or worsening spinal cord injury. This bradycardia reflects loss of sympathetic tone and signifies cardiovascular collapse, making it a critical, life-threatening deterioration. B. Glasgow coma score of 15: A GCS of 15 represents full neurological alertness and orientation. This finding indicates improvement or stability, not deterioration, in a trauma client’s neurological status. C. Oxygen saturation 90 percent: While this indicates mild hypoxemia requiring intervention, it is not as severe or immediately life-threatening as the transition from tachycardia to bradycardia in the setting of shock. Oxygen supplementation can typically correct this decline. D. Respiration 34 breaths/minute: An increase in respiratory rate signals distress or pain but still maintains ventilatory effort. Though concerning, it does not reflect a critical deterioration compared to severe bradycardia with hypotension, which threatens perfusion and cardiac output.