A nurse is reviewing the laboratory results of a client who is postoperative and has a respiratory rate of 7/min. The arteriaI 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 make7
Metabolic acidosis
Respiratory acidosis
Respiratory alkalosis
Metabolic alkalosis
The Correct Answer is B
A. Metabolic acidosis:
Metabolic acidosis is characterized by a low pH (<7.35) and a low bicarbonate level (<22 mEq/L) due to an excess of acids in the body or a loss of bicarbonate. However, in the given ABG values, the pH is low (7.22), but the bicarbonate level is elevated (28 mEq/L), which does not align with metabolic acidosis. Therefore, metabolic acidosis is not the correct interpretation in this case.
B. Respiratory acidosis:
Respiratory acidosis occurs when there is inadequate removal of carbon dioxide (CO2) by the lungs, leading to an accumulation of CO2 in the blood and a decrease in pH. In the ABG values provided, the pH is low (7.22), and the PaCO2 is elevated (68 mm Hg), indicating respiratory acidosis as the primary disturbance. This interpretation is supported by the elevated PaCO2 and the low pH, making it the correct choice based on the given data.
C. Respiratory alkalosis:
Respiratory alkalosis results from hyperventilation, leading to excessive elimination of CO2 and a decrease in PaCO2 levels. However, in the ABG values presented, the PaCO2 is elevated (68 mm Hg), which contradicts the expected decrease seen in respiratory alkalosis. Therefore, respiratory alkalosis is not the correct interpretation of the ABG values in this case.
D. Metabolic alkalosis:
Metabolic alkalosis is characterized by a high pH (>7.45) and a high bicarbonate level (>26 mEq/L) due to excessive loss of acids or an increase in bicarbonate levels. However, in the ABG values provided, the pH is low (7.22), and the bicarbonate level is elevated (28 mEq/L), which is not consistent with metabolic alkalosis. Therefore, metabolic alkalosis is not the correct interpretation based on the given data.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Cluster of oral herpes sores: Oral herpes sores typically heal within a few weeks and do not generally become chronic wounds unless there are complications or underlying immune system issues. They are more acute in nature and tend to resolve without becoming chronic.
B. Abdominal surgical incision: Surgical incisions are designed to heal within a specific timeframe, usually a few weeks to a couple of months, depending on the type of surgery and individual healing factors. While surgical wounds can sometimes have delayed healing or complications, they are not typically categorized as chronic wounds unless they fail to heal or become recurrent over an extended period.
C. Diabetic foot ulcer: Diabetic foot ulcers are highly prone to becoming chronic wounds due to the underlying pathology associated with diabetes, such as neuropathy (nerve damage), peripheral vascular disease (poor circulation), and impaired immune function. These factors can impair the normal healing process, leading to delayed healing, infection, and the potential for the wound to become chronic if not managed appropriately.
D. Posterior scalp wound: Scalp wounds can heal relatively quickly, especially with proper wound care and management. However, certain factors such as the size of the wound, depth, presence of infection, and underlying conditions can influence the likelihood of a scalp wound becoming chronic. In general, scalp wounds are less likely to become chronic compared to wounds in areas with higher risk factors, such as diabetic foot ulcers.
Correct Answer is A
Explanation
A. Electrical burns can have small amounts of skin damage, but more extensive damage beneath the skin.
This response is the best choice because it educates the client about the potential for deeper tissue damage associated with electrical burns. It acknowledges that while the burn on the skin may appear small, the damage underneath could be more extensive, affecting muscles, nerves, and blood vessels.
B. Electrical burns commonly cause reddened/purplish skin without blistering.
This statement is not the best response because it focuses solely on the appearance of the skin without addressing the potential for deeper tissue damage. While it is true that electrical burns can present with reddened or purplish skin without blistering, this response does not provide comprehensive information about the nature and severity of electrical burns.
C. Electrical burns typically are minor.
This response is incorrect because it downplays the seriousness of electrical burns. While some electrical burns may indeed be minor, others can cause significant tissue damage and complications. It's important for the nurse to educate the client about the range of severity that electrical burns can present.
D. Electrical burns usually cause much more skin damage than what can be seen on your skin.
This statement is partially accurate but does not provide as much information as choice A. While it acknowledges that electrical burns can cause more damage than what is visible on the skin's surface, it doesn't emphasize the potential for deeper tissue damage as effectively as choice A does.
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