<prompt> A 26-year-old man is admitted through the casualty of the hospital for a heroin overdose. His hea rate is 45 beatsmin, and his blood pressure is 7540 mm Hg. Which of the following best depicts the results from an aerial blood sample?pH 7.22, PaCO2 mm Hg 66, HCO3- mEqL 26pH 7.34, PaCO2 mm Hg 29, HCO3- mEqL 15pH 7.40, PaCO2 mm Hg 40, HCO3- mEqL 24pH 7.47, PaCO2 mm Hg 20, HCO3- mEqL 14  <response>: This man has a respiratory acidosis. Overdose with drugs that suppress ventilation e.g., heroin, morphine, barbiturates, methaqualone, and sleeping pills often causes hypercapnia. In patients with an intact renal response, the respiratory acidosis causes a compensatory rise in plasma HCO3-, which lessens the fall in pH. However, the renal response requires several days to develop fully. The plasma HCO3- of 26 mEqL normal: 22-28 mEqL for this man is typical of acute respiratory acidosis with little or no renal compensation. pH 7.34, PaCO2 mm Hg 29, HCO3- mEqL 15 reflects metabolic acidosis. pH 7.40, PaCO2 mm Hg 40, HCO3- mEqL 24 is normal. pH 7.47, PaCO2 mm Hg 20, HCO3- mEqL 14 reflects respiratory alkalosis. 