Final answer:
The blood gas results indicate chronic hypercapnic respiratory failure due to an opiate drug overdose.
Step-by-step explanation:
The blood gas results of the patient with an opiate drug overdose indicate chronic hypercapnic respiratory failure.
Chronic hypercapnic respiratory failure refers to a condition where there is abnormally elevated blood levels of CO2 and impaired respiratory function. In this case, the patient's PCO2 level is high (89), indicating an excess of carbonic acid and CO2 in the blood. This can be caused by hypoventilation due to opiate drug overdose.
Therefore, the correct answer is option b. chronic hypercapnic respiratory failure.