A nurse is caring for a patient who has acute kidney injury.
The patient’s ABGs are: pH: 7.26, PaCO2: 30 mm Hg, HCO3: 14 mEq/L. Which of the following acid-base imbalances should the nurse identify the patient is experiencing?
Metabolic alkalosis.
Metabolic acidosis.
Respiratory alkalosis.
Respiratory acidosis.
The Correct Answer is B
Choice A rationale:
Metabolic alkalosis is characterized by a high pH (above 7.45), high bicarbonate (HCO3-) levels, and normal or low PaCO2. The patient's ABGs show a low pH (7.26), low bicarbonate (14 mEq/L), and low PaCO2 (30 mm Hg), which are not consistent with metabolic alkalosis.
Choice C rationale:
Respiratory alkalosis is characterized by a high pH (above 7.45), low PaCO2, and normal or slightly elevated bicarbonate levels. The patient's ABGs do show a low PaCO2, but the pH is low (acidic) and the bicarbonate is low, which are not consistent with respiratory alkalosis.
Choice D rationale:
Respiratory acidosis is characterized by a low pH (below 7.35), high PaCO2, and normal or slightly elevated bicarbonate levels. The patient's ABGs do show a low pH, but the PaCO2 is also low, which is not consistent with respiratory acidosis.
Rationale for the correct answer, B:
Metabolic acidosis is characterized by a low pH (below 7.35), low bicarbonate levels, and normal or low PaCO2. The patient's ABGs are consistent with metabolic acidosis because they show a low pH (7.26), low bicarbonate (14 mEq/L), and low PaCO2 (30 mm Hg).
Acute kidney injury is a common cause of metabolic acidosis. The kidneys play a vital role in regulating acid-base balance by excreting acids and reabsorbing bicarbonate. When the kidneys are damaged, they are unable to excrete acids effectively, leading to an accumulation of acids in the blood and a decrease in bicarbonate levels.
Additional Information:
It's important to note that the patient's low PaCO2 is likely a compensatory mechanism for the metabolic acidosis. In response to acidosis, the respiratory system tries to increase ventilation to blow off more carbon dioxide, which helps to raise the pH. However, this compensatory mechanism is often not enough to fully correct the acidosis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
It is not necessary to remind a patient to avoid turning from side to side after femoral artery catheterization. Restricting movement in this way could actually increase the risk of complications such as deep vein thrombosis (DVT).
Early ambulation is generally encouraged to promote circulation and prevent blood clots.
Patients are typically allowed to turn and reposition themselves as needed for comfort, unless there are specific contraindications.
Choice B rationale:
Keeping the patient in a high-Fowler's position for 6 hours is not a standard recommendation following femoral artery catheterization.
The patient's position should be based on their individual needs and comfort level.
In some cases, a slight elevation of the head of the bed may be helpful to promote venous return, but prolonged high-Fowler's positioning is not necessary.
Choice C rationale:
Passive range-of-motion exercises are not typically performed on the affected extremity immediately following femoral artery catheterization.
This is because there is a risk of dislodging the catheter or causing bleeding at the puncture site.
Once the catheter has been removed and the puncture site has healed, gentle range-of-motion exercises may be recommended to help maintain joint mobility.
Choice D rationale:
Checking pedal pulses every 15 minutes is essential to assess for adequate circulation to the lower extremities following femoral artery catheterization.
This is because there is a risk of complications such as thrombosis or embolism, which can compromise blood flow to the legs and feet.
If the pedal pulses are weak or absent, it could indicate a serious problem that requires immediate intervention.
Correct Answer is D
Explanation
Choice A rationale:
Serosanguineous drainage is a mixture of blood serum and blood. It is typically thin and watery, with a pinkish or reddish hue.
It is common in the early stages of wound healing, as small blood vessels are injured and release their contents. However, it's not consistent with the yellow and thick drainage described in the question, making it an unlikely choice.
Choice B Rationale:
Serous drainage is clear and watery, composed primarily of blood plasma.
It's also common in the early stages of wound healing and is considered a normal part of the process. However, the clear and watery nature of serous drainage doesn't match the thick, yellow drainage described in the question, ruling out this option.
Choice C Rationale:
Sanguineous drainage is composed primarily of fresh blood.
It's often bright red and may be thick or thin, depending on the amount of bleeding. While sanguineous drainage can indicate a problem, it's typically associated with active bleeding or recent trauma. The yellow color of the drainage in the question makes this choice less likely.
Choice D Rationale:
Purulent drainage is a thick, yellow, green, or brown fluid that often has a foul odor.
It's a sign of infection, as it contains dead white blood cells, bacteria, and debris. The yellow and thick consistency of the drainage described in the question strongly suggests purulent drainage, making it the most likely answer.
Key Points:
The color, consistency, and odor of wound drainage can provide valuable clues about the healing process and potential complications.
Purulent drainage is a hallmark of infection and requires prompt attention.
Nurses play a crucial role in assessing wound drainage and reporting any concerns to the healthcare team.
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