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 D

Explanation

A. In the prone position:
The prone position has been shown to be beneficial in certain respiratory conditions, particularly in acute respiratory distress syndrome (ARDS), where it can help improve oxygenation by redistributing blood flow in the lungs. However, prone positioning is typically not the first choice for pneumonia, especially when it is localized to specific lobes of the lung. It is more commonly used in cases of diffuse bilateral lung injury or severe hypoxemia. Therefore, while prone positioning can improve oxygenation in ARDS, it is not specifically targeted for secretion removal in localized pneumonia.

B. In high-Fowler's position:
The high-Fowler's position (sitting up at a 60-90 degree angle) can help with dyspnea and promote lung expansion in conditions like heart failure or dyspneic states. However, for pneumonia, it is not as effective as lateral positioning for facilitating secretion drainage from specific lung lobes. The high-Fowler's position may be useful for promoting overall comfort and reducing dyspnea, but it is not the best position for improving secretion removal from the right middle and lower lobes.

C. On the left side:
Positioning the patient on the left side is not ideal for right middle and lower lobe pneumonia, as it would not optimize drainage from the affected lobes. The right middle and lower lobes are better drained when the patient is positioned on the right side, as gravity can help move the secretions from the affected lobes toward the larger airways for easier clearance.

D. On the right side: In the case of right middle and lower lobe pneumonia, positioning the client on the right side can help optimize ventilation and promote better secretion removal from the affected areas of the lung. This position allows gravity to assist in draining secretions from the right middle and lower lobes toward the larger airways, where they can be more easily cleared by coughing or suctioning. This positioning can improve oxygenation and facilitate secretion management, which is crucial for improving respiratory function in pneumonia.

A. Partially compensated metabolic alkalosis B. Partially compensated respiratory acidosis C. Fully compensated metabolic alkalosis D. Fully compensated respiratory acidosis

Correct Answer is B

Explanation

A. Partially compensated metabolic alkalosis:
Metabolic alkalosis is characterized by elevated bicarbonate levels (HCO3), but in this case, the HCO3 is elevated (29 mEq/L), which suggests alkalosis. However, the PaCO2 is elevated at 47 mmHg, which is more consistent with a respiratory problem. A fully or partially compensated metabolic alkalosis would show a normal or low PaCO2 (due to respiratory compensation). Therefore, this option does not fit the ABG results.

B. Partially compensated respiratory acidosis: In this case, the pH is 7.17, which is low and indicates acidosis. The PaCO2 is 47 mmHg, which is elevated (normal range: 35-45 mmHg), indicating that the respiratory system is contributing to the acidosis. The HCO3 is 29 mEq/L, which is elevated (normal range: 22-26 mEq/L), suggesting a compensatory response from the kidneys to retain bicarbonate in an attempt to buffer the acidosis. Since the pH is still below normal and has not yet returned to the normal range (7.35-7.45), this suggests that the compensation is partial and the primary issue is respiratory acidosis.

C. Fully compensated metabolic alkalosis:
This answer is incorrect because metabolic alkalosis is not the primary disturbance here. Also, for a condition to be fully compensated, the pH would need to be within the normal range (7.35-7.45). Since the pH is 7.17, the condition is not fully compensated.

D. Fully compensated respiratory acidosis:
For fully compensated respiratory acidosis, the pH should be within the normal range, as the kidneys would have fully compensated for the elevated PaCO2. Since the pH is 7.17, this is a sign of partial compensation, not full compensation. Therefore, this option is incorrect.

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Naxlex Comprehensive Predictor Exams

The nurse is caring for a client diagnosed with acute respiratory failure as a result of right middle and lower lobe pneumonia. To optimize ventilation and secretion removal the nurse should position the client:

Correct Answer is D

Explanation

Correct Answer is B

Explanation

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