A nurse is caring for a client who has metabolic alkalosis as a result of prolonged nasogastric suctioning. The nurse should expect which of the following arterial blood gas values?
pH 7.50, PaCO2 40 mm Hg, HCO3- 30 mEq/L.
pH 7.35, PaCO2 35 mm Hg, HCO3- 24 mEq/L.
pH 7.25, PaCO2 50 mm Hg, HCO3- 26 mEq/L.
pH 7.30, PaCO2 30 mm Hg, HCO3- 18 mEq/L.
The Correct Answer is A
Choice A reason:
pH 7.50, PaCO2 40 mm Hg, HCO3- 30 mEq/L. This choice is correct because it shows a high pH, a normal PaCO2, and a high HCO3-, which are consistent with metabolic alkalosis. Metabolic alkalosis occurs when there is a loss of acid or a gain of base in the body fluids, such as from prolonged nasogastric suctioning. The kidneys try to compensate by excreting more bicarbonate, but this process is slow and incomplete.
Choice B reason:
pH 7.35, PaCO2 35 mm Hg, HCO3- 24 mEq/L. This choice is incorrect because it shows normal values for pH, PaCO2, and HCO3-, which indicate no acid-base imbalance. A client with metabolic alkalosis would have an elevated pH and bicarbonate level.
Choice C reason:
pH 7.25, PaCO2 50 mm Hg, HCO3- 26 mEq/L. This choice is incorrect because it shows a low pH, a high PaCO2, and a normal HCO3-, which are consistent with respiratory acidosis. Respiratory acidosis occurs when there is impaired gas exchange or hypoventilation, leading to an accumulation of carbon dioxide in the blood. The kidneys try to compensate by retaining more bicarbonate, but this process is slow and incomplete.
Choice D reason:
pH 7.30, PaCO2 30 mm Hg, HCO3- 18 mEq/L. This choice is incorrect because it shows a low pH, a low PaCO2, and a low HCO3-, which are consistent with metabolic acidosis. Metabolic acidosis occurs when there is a gain of acid or a loss of base in the body fluids, such as from diabetic ketoacidosis or diarrhea. The lungs try to compensate by increasing the rate and depth of breathing to expel more carbon dioxide, but this process is fast and limited.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason:
Kussmaul respirations are a type of deep, rapid breathing that occurs in response to metabolic acidosis. The body tries to compensate for the excess acid by blowing off carbon dioxide through the lungs. Kussmaul respirations are a common manifestation of diabetic ketoacidosis (DKA), which is a severe form of metabolic acidosis caused by the accumulation of ketones in the blood. The nurse should monitor the client's respiratory rate, depth, and pattern, as well as the arterial blood gas results, to assess the severity of metabolic acidosis and the effectiveness of treatment.
Choice B reason:
Bradypnea is a condition of abnormally slow breathing, usually less than 12 breaths per minute. Bradypnea can result from respiratory acidosis, which is a condition of excess carbon dioxide in the blood due to hypoventilation or impaired gas exchange. Bradypnea is not a manifestation of metabolic acidosis, which is a condition of excess acid in the blood due to increased production or decreased elimination of hydrogen ions. Therefore, choice B is incorrect.
Choice C reason:
Muscle spasms are involuntary contractions of the skeletal muscles that can cause pain and discomfort. Muscle spasms can result from hypocalcemia, which is a condition of low calcium levels in the blood. Hypocalcemia can occur in metabolic acidosis due to the binding of calcium with excess hydrogen ions, reducing the availability of free calcium for muscle contraction. However, muscle spasms are not a specific or common manifestation of metabolic acidosis, and they can have other causes such as dehydration, electrolyte imbalance, or muscle injury. Therefore, choice C is incorrect.
Choice D reason:
Numbness and tingling of extremities are sensations of reduced or abnormal feeling in the arms or legs. Numbness and tingling can result from hypokalemia, which is a condition of low potassium levels in the blood. Hypokalemia can occur in metabolic acidosis due to the movement of potassium from the intracellular to the extracellular space in exchange for hydrogen ions, which are then excreted by the kidneys. However, numbness and tingling are not specific or common manifestations of metabolic acidosis, and they can have other causes such as nerve compression, peripheral neuropathy, or hyperventilation. Therefore, choice D is incorrect.
Correct Answer is ["A","B","C","D"]
Explanation
Choice A reason:
Jugular vein distension is a sign of fluid overload because it indicates increased pressure in the right atrium and superior vena cava due to excess blood volume.
Choice B reason:
Weight gain of 2 kg in one day is a sign of fluid overload because it reflects fluid retention in the body. A weight gain of 1 kg (2.2 lb) is equivalent to 1 L of fluid.
Choice C reason:
Decreased hematocrit is a sign of fluid overload because it indicates hemodilution or dilution of the blood due to excess fluid in the intravascular space.
Choice D reason:
Bounding pulse is a sign of fluid overload because it reflects increased cardiac output and stroke volume due to excess blood volume.
Choice E reason:
Flat neck veins are not a sign of fluid overload, but rather a sign of fluid deficit or dehydration. In fluid overload, neck veins will be distended or elevated.
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