A client has the following arterial blood gas values: pH, 7.52; PaO2 , 50 mm Hg (6.7 kPa); PaCO2 , 28 mm Hg (3.7 kPa); HCO3 – , 24 mEq/L (24 mmol/L). The nurse determines that which of the following...

A client has the following arterial blood gas values: pH, 7.52; PaO2 , 50 mm Hg (6.7 kPa); PaCO2 , 28 mm Hg (3.7 kPa); HCO3 – , 24 mEq/L (24 mmol/L). The nurse determines that which of the following is a possible cause for these findings?

1. Chronic obstructive pulmonary disease (COPD).

2. Diabetic ketoacidosis with Kussmaul's respirations.

3. Myocardial infarction.

4. Pulmonary embolus.