The nurse is analyzing a client's arterial blood gas (ABG) values with the following results: pH 7.44, PaCO2 30 mmHg, Pa02 90 mmHg, and HCO3 18mEg/L. Which acid base Imbalance should the nurse associate with these results?

Table 9.9 Normal Arterial Blood Gas Values

ABG Value.                                                             Normal Value

pH                                                                             7.35-7.45

PaCO2                                                                                                            35-45 mmHg

HCO3-                                                                         22-26mEq/L

Base excess                                                               -2 to +2

PaO2                                                                            80-95 mmHg

SaO2                                                                            >95%

Partially compensated metabolic alkalosis

Partially compensated metabolic acidosis

Fully compensated respiratory acidosis

Fully compensated respiratory alkalosis

Answer and Explanation

The Correct Answer is B

A) Partially compensated metabolic alkalosis:
Metabolic alkalosis is typically characterized by an elevated pH and a high bicarbonate level (HCO3 >26 mEq/L). In this scenario, the pH is normal (7.44), and the bicarbonate level (HCO3 18 mEq/L) is low, which does not support a diagnosis of metabolic alkalosis. Furthermore, there is no evidence of compensation by respiratory mechanisms (i.e., low PaCO2). Therefore, this is not a likely diagnosis.

B) Partially compensated metabolic acidosis:
The ABG values indicate metabolic acidosis with a low bicarbonate level (HCO3 18 mEq/L) and a pH of 7.44, which is on the higher end of the normal range. A lower-than-normal bicarbonate level suggests an acidotic state, but the pH is compensating toward normal. The PaCO2 of 30 mmHg indicates a compensatory respiratory alkalosis, which would lower the PaCO2 to try to offset the acidosis. This represents a partially compensated metabolic acidosis, where the body is attempting to compensate for the acidosis but has not fully done so.

C) Fully compensated respiratory acidosis:
Respiratory acidosis is associated with elevated levels of carbon dioxide (PaCO2 >45 mmHg), which leads to a drop in pH. However, in this scenario, the PaCO2 is only 30 mmHg, which is lower than the normal range (35-45 mmHg), indicating that the problem is not respiratory acidosis. Additionally, fully compensated respiratory acidosis would show a normal pH with an elevated PaCO2 and compensatory elevation in bicarbonate levels. Thus, this option does not fit the ABG values.

D) Fully compensated respiratory alkalosis:
Respiratory alkalosis occurs when excessive CO2 is exhaled, leading to an elevated pH and a low PaCO2. Although the PaCO2 is low (30 mmHg), which could suggest respiratory alkalosis, the bicarbonate (HCO3) is low at 18 mEq/L, not high as would be expected in a fully compensated respiratory alkalosis. In a fully compensated state, the pH would be normal (around 7.4), and there would be compensatory changes in both the bicarbonate and PaCO2. Since the bicarbonate is low and the pH is not at normal levels, this diagnosis is not appropriate.

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Correct Answer is B

Explanation

A) Apply 4L of nasal oxygen, administer a cough suppressant, and place client on bedrest:
This approach is inappropriate for a client with bacterial pneumonia. While oxygen therapy may be necessary for some clients, administering a cough suppressant in this scenario is counterproductive. Pneumonia often leads to the accumulation of secretions, and suppressing the cough would prevent the client from clearing mucus from their airways, potentially worsening the condition. Bedrest is generally indicated, but it should not be the sole intervention.

B) Increase fluid intake, administer antibiotic(s), and facilitate adequate coughing:
This is the most appropriate plan of care. Increasing fluid intake helps to thin the mucus, making it easier to clear from the airways, which is crucial in pneumonia. Antibiotics are necessary to treat the bacterial infection causing pneumonia. Facilitating adequate coughing helps the client expel secretions, reducing the risk of airway obstruction and improving oxygenation. Coarse rhonchi indicate the presence of mucus or secretions, which should be cleared with effective coughing.

C) Decrease activity, increase bronchodilator use, and encourage pursed lip breathing:
Decreasing activity is generally appropriate for a client with pneumonia to reduce fatigue, but increasing bronchodilator use is not typically indicated unless there is underlying bronchospasm, such as in asthma or COPD. Pursed lip breathing can help improve ventilation, but it is more beneficial for clients with obstructive airway diseases, not primarily for those with bacterial pneumonia. Therefore, this option does not address the immediate needs of the client.

D) Place in prone position, begin steroid therapy, and monitor glucose levels:
While prone positioning is helpful in some conditions like acute respiratory distress syndrome (ARDS), it is not routinely used for bacterial pneumonia unless the client has severe hypoxemia and requires advanced respiratory support. Steroid therapy is generally not indicated for bacterial pneumonia unless there is a specific inflammatory component (such as a superimposed condition like asthma or COPD). Monitoring glucose levels may be important in clients on steroid therapy, but this is not a primary concern in the treatment of bacterial pneumonia.

A. fully compensated respiratory acidosis. B. partially compensated respiratory acidosis. C. uncompensated metabolic acidosis. D. partially compensated metabolic acidosis.

Correct Answer is D

Explanation

A. Fully compensated respiratory acidosis: Fully compensated respiratory acidosis would involve a low pH (indicative of acidosis), elevated PaCO2 (due to impaired ventilation), and a normal HCO3 level as compensation by the kidneys. The given ABG results show metabolic acidosis with partial respiratory compensation, not respiratory acidosis.

B. Partially compensated respiratory acidosis: In respiratory acidosis, you would expect an elevated PaCO2 (not low, as seen here) and a compensatory increase in HCO3. However, the ABG results show low HCO3 and low PaCO2, indicating that this is metabolic acidosis, not respiratory acidosis.

C. Uncompensated metabolic acidosis: Uncompensated metabolic acidosis would be indicated by a low pH and low bicarbonate (HCO3), with normal PaCO2. Since the PaCO2 is low, this suggests partial respiratory compensation, making this scenario not uncompensated but partially compensated.

D. Partially compensated metabolic acidosis: To interpret these ABG results, let's break down the values:

pH 7.32 (normal range: 7.35–7.45) indicates acidosis, as it is below the normal range.

PaCO2 33 mmHg (normal range: 35–45 mmHg) is low, suggesting that respiratory compensation is occurring to counteract the acidosis. In metabolic acidosis, the lungs typically attempt to blow off CO2 to reduce acid levels, which is why PaCO2 is low here.

HCO3 16 mEq/L (normal range: 22–25 mEq/L) is low, confirming a metabolic acidosis. The low bicarbonate level is characteristic of metabolic acidosis, where the body loses too much bicarbonate or produces too much acid. PaO2 88 mmHg (normal range: 80–95 mmHg) is within the normal range and does not indicate a significant respiratory issue.

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Correct Answer is B

Explanation

Correct Answer is D

Explanation

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