A nurse is caring for an endurance athlete admitted for altered mental status. The client drank large amounts of water during a recent long-distance running event. The client is confused, complaining of a headache, and has a full bounding pulse. The nurse develops the plan of care based on the expectation that the client's lab work will demonstrate which of the following abnormalities?

Serum potassium 5.0 mEq/L

Serum osmolality 294 mmol/kg

Serum sodium of 127 mEq/L

Serum hemoglobin 15.7 grams/dL

Answer and Explanation

The Correct Answer is C

A. Serum potassium 5.0 mEq/L: This is within the normal range for serum potassium (3.5-5.0 mEq/L). While potassium levels are important, they are not the primary concern with symptoms of confusion and a bounding pulse due to excessive water intake.
B. Serum osmolality 294 mmol/kg: This value is within the normal range for serum osmolality (275-295 mmol/kg). Elevated or normal osmolality would not be expected in a case of water intoxication, which dilutes serum electrolytes.
C. Serum sodium of 127 mEq/L: A serum sodium level of 127 mEq/L indicates hyponatremia, a condition often caused by excessive water intake that dilutes the sodium in the bloodstream. Symptoms such as confusion, headache, and a full bounding pulse are consistent with hyponatremia, making this the expected abnormality.
D. Serum hemoglobin 15.7 grams/dL: This is within the normal range for hemoglobin (12-16 grams/dL for women and 13.8-17.2 grams/dL for men). Hemoglobin levels would not be expected to change significantly due to water intoxication.

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Correct Answer is C

Explanation

A. Kidney conservation of bicarbonate and excretion of hydrogen ions: This option is not correct for metabolic alkalosis. In metabolic alkalosis, the kidneys would typically excrete bicarbonate rather than conserve it.
B. Deep, rapid respirations to increase CO2 excretion: This is incorrect because deep, rapid respirations are more associated with compensating for metabolic acidosis by increasing CO2 excretion. In metabolic alkalosis, the body attempts to retain CO2.
C. Respiratory hypoventilation to retain CO2 and kidney excretion of bicarbonate: This is the correct choice. In metabolic alkalosis, the body compensates by reducing respiration rate (hypoventilation) to retain CO2, which helps to counteract the elevated pH. Additionally, the kidneys may excrete bicarbonate to balance the pH.
D. Shifting of bicarbonate into cells in exchange for chloride: This mechanism is more related to respiratory alkalosis rather than metabolic alkalosis. In metabolic alkalosis, the primary compensatory mechanisms involve changes in respiratory rate and renal bicarbonate excretion.

A. Discard the container of formula every 12 hours B. Irrigate the tube with sterile water before administering medications C. Measure & record the residual volume after each feeding D. Keep head of bed elevated 30 degrees

Correct Answer is D

Explanation

A. Discard the container of formula every 12 hours: While this is important for preventing contamination, it does not directly address the risk of aspiration.
B. Irrigate the tube with sterile water before administering medications: This helps maintain tube patency and prevent clogging but does not significantly impact the prevention of aspiration.
C. Measure & record the residual volume after each feeding: Monitoring residuals is crucial for assessing gastric emptying and preventing overfeeding but does not directly prevent aspiration.
D. Keep head of bed elevated 30 degrees: This is the correct choice. Elevating the head of the bed reduces the risk of aspiration by ensuring that gravity helps keep the feeding in the stomach and minimizes the risk of reflux into the esophagus.

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Naxlex Comprehensive Predictor Exams

A student nurse is working with their preceptor on a medical-surgical unit. While reviewing concepts related to acid-base balance, what should the preceptor state is a compensatory mechanism for metabolic alkalosis?

Correct Answer is C

Explanation

A nurse is caring for a client receiving continuous enteral feedings via a gastrostomy tube. Which nursing intervention is most important to help prevent aspiration?

Correct Answer is D

Explanation

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