A nurse is reviewing the laboratory results of a client who is postoperative and has a respiratory rate of 7/min. The arterial blood gas (ABG) values include: pH 7.22 PaCO2 68 mm Hg Base excess -2 PaO2 78 mm Hg Oxygen saturation 80% Bicarbonate 28 mEq/L. Which of the following interpretations of the ABG values should the nurse make?

A. Metabolic acidosis

Metabolic acidosis is characterized by a low pH (< 7.35) and a decreased bicarbonate level (< 22 mEq/L). In this scenario, the pH is low (7.22), but the bicarbonate level is elevated (28 mEq/L), which does not support a diagnosis of metabolic acidosis.

B. Respiratory acidosis

Respiratory acidosis occurs when there is an accumulation of carbon dioxide (PaCO2 > 45 mm Hg), leading to a decrease in pH (< 7.35). In this case, the pH is low (7.22), and the PaCO2 is elevated (68 mm Hg), consistent with respiratory acidosis.

C. Metabolic alkalosis

Metabolic alkalosis is characterized by a high pH (> 7.45) and an elevated bicarbonate level (> 26 mEq/L). In this scenario, the pH is low (7.22), and the bicarbonate level is also elevated (28 mEq/L), which does not support a diagnosis of metabolic alkalosis.

D. Respiratory alkalosis

Respiratory alkalosis occurs when there is a decrease in carbon dioxide (PaCO2 < 35 mm Hg), leading to an increase in pH (> 7.45). In this case, the pH is low (7.22), and the PaCO2 is elevated (68 mm Hg), which is not consistent with respiratory alkalosis.

A. Liver function tests

This is the correct choice. Pyrazinamide, a medication used in the treatment of tuberculosis, is known to potentially cause hepatotoxicity, which refers to liver damage or dysfunction. Therefore, clients prescribed pyrazinamide should undergo regular monitoring of liver function tests to assess for any signs of liver injury or impairment. Liver function tests typically include measurements of various enzymes and proteins produced by the liver, such as alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), and bilirubin levels.

B. Gallbladder studies

Gallbladder studies are not typically indicated for clients taking pyrazinamide. While pyrazinamide can rarely cause hepatotoxicity, which may affect liver function, it is not known to specifically target or affect the gallbladder. Therefore, routine gallbladder studies are not necessary for clients taking pyrazinamide.

C. Thyroid function studies

Pyrazinamide is not known to directly affect thyroid function. Therefore, routine thyroid function studies are not indicated for clients taking pyrazinamide unless there are specific signs or symptoms suggesting thyroid dysfunction.

D. Blood glucose levels

Pyrazinamide is not known to directly affect blood glucose levels. Therefore, routine monitoring of blood glucose levels is not indicated for clients taking pyrazinamide unless there are specific reasons to suspect or monitor for diabetes mellitus or other conditions affecting blood glucose regulation.