Which findings would indicate that a client with Adult Respiratory Distress Syndrome (ARDS) is deteriorating?

A. PaO2 58 mm Hg, heart rate 108 beats per minute: While these values are abnormal, PaO2 is low and the client is tachycardic), they are expected findings in the early to middle stages of ARDS. In ARDS, the lungs are stiff and filled with fluid, leading to "refractory hypoxemia." The heart rate increases to compensate for low oxygen levels. This represents the disease state. B. PCO2 33 mm Hg, respiratory rate 10 breaths per minute: A low PCO2 indicates hyperventilation, and a respiratory rate of 10 is actually below normal. While hypoventilation is concerning, in ARDS, worsening deterioration is more commonly reflected by hypoxemia rather than mild changes in CO2. C. PCO2 47 mm Hg, respiratory rate 32 breaths per minute: An elevated PCO2 with a high respiratory rate indicates the client is tiring and unable to maintain effective ventilation, signaling progression toward respiratory failure in ARDS. D. PaO2 87 mm Hg, heart rate 80 beats per minute: These values are within near-normal limits, indicating adequate oxygenation and stable hemodynamics. This does not reflect deterioration and suggests the client is relatively stable.