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A client has a nasogastric (NG) tube placed during abdominal surgery. During postoperative convalescence, which arterial blood gas values are consistent with metabolic alkalosis?

A.

pH 7.49, PCO₂ 45 mm Hg, HCO₃ 32 mEq/L (32 mmol/L), PO₂ 90 mm Hg.

B.

pH 7.30, PCO₂ 20 mm Hg, HCO₃ 22 mEq/L (22 mmol/L), PO₂ 85 mm Hg.

C.

pH 7.46, PCO₂ 55 mm Hg, HCO₃ 36 mEq/L (36 mmol/L), PO₂ 95 mm Hg.

D.

pH 7.29, PCO₂ 35 mm Hg, HCO₃ 25 mEq/L (25 mmol/L), PO₂ 99 mm Hg.

Answer and Explanation

The Correct Answer is A

Choice A rationale

 

pH 7.49, PCO₂ 45 mm Hg, HCO₃ 32 mEq/L (32 mmol/L), PO₂ 90 mm Hg indicates metabolic alkalosis. The elevated pH and HCO₃ levels are consistent with this condition.

 

Choice B rationale

 

pH 7.30, PCO₂ 20 mm Hg, HCO₃ 22 mEq/L (22 mmol/L), PO₂ 85 mm Hg indicates metabolic acidosis with respiratory compensation, not metabolic alkalosis.

 

Choice C rationale

 

pH 7.46, PCO₂ 55 mm Hg, HCO₃ 36 mEq/L (36 mmol/L), PO₂ 95 mm Hg indicates metabolic alkalosis with respiratory compensation. However, the pH is slightly lower than in Choice A, making Choice A more indicative of metabolic alkalosis.

 

Choice D rationale

 

pH 7.29, PCO₂ 35 mm Hg, HCO₃ 25 mEq/L (25 mmol/L), PO₂ 99 mm Hg indicates metabolic acidosis, not metabolic alkalosis.

 


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View Related questions

Correct Answer is C

Explanation

Choice A rationale

Lansoprazole, a proton pump inhibitor (PPI), typically requires several weeks to achieve its full therapeutic effect. Notifying the healthcare provider for a dosage change after only one week is premature and not supported by clinical guidelines.

Choice B rationale

Auscultating bowel sounds and measuring abdominal girth are not directly related to the effectiveness of lansoprazole in treating GERD. These actions are more relevant for assessing gastrointestinal motility and potential complications like bowel obstruction.

Choice C rationale

Healing of erosive esophagitis with PPIs like lansoprazole usually takes several weeks. Advising the client that healing typically takes several weeks to occur is appropriate and aligns with the expected therapeutic timeline.

Choice D rationale

Lansoprazole should be taken before meals, not after, to maximize its effectiveness. Confirming that the client is taking the medication one hour after meals would not address the issue of symptom persistence.

Correct Answer is D

Explanation

Choice A rationale

Laying down on each side with knees bent and breathing from the abdomen is not an effective technique for improving gas exchange in emphysema patients.

Choice B rationale

Increasing the breathing rate for a full 30 seconds can lead to hyperventilation and is not recommended for improving gas exchange.

Choice C rationale

Raising hands above the head to expand the diaphragm is not a recognized technique for improving gas exchange in emphysema patients.

Choice D rationale

Drawing air in through the nose and exhaling slowly through pursed lips is an effective technique for improving gas exchange in emphysema patients. This method helps to keep the airways open longer and improves the removal of trapped air.

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