The nurse is caring for a client diagnosed with acute respiratory distress syndrome (ARDS). The client's ABG reveals: pH 7.59, PaCO2 29 mmHg, Pa02 55 mmHg, HCO3 22 mEq/L, and 02 saturation 72%. What would be the expected assessment finding?

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%

respiratory rate of 10 breaths per minute.

respiratory rate of 32 breaths per minute.

blood pressure 86/42 mmHg.

heart rate of 45 beats per minute.

Answer and Explanation

The Correct Answer is B

Explanation of each option:

A. Respiratory rate of 10 breaths per minute:
A respiratory rate of 10 breaths per minute would be too slow in a patient with ARDS and hypoxemia. In response to hypoxemia, the body typically increases the respiratory rate to improve oxygenation. A respiratory rate of 10 breaths per minute would not be expected in this situation.

B. Respiratory rate of 32 breaths per minute: The arterial blood gas (ABG) results indicate respiratory alkalosis with hypoxemia, which is a common finding in patients with acute respiratory distress syndrome (ARDS). pH 7.59: This is alkalotic, meaning the body is experiencing respiratory alkalosis.

PaCO2 29 mmHg: The PaCO2 is low, indicating hyperventilation, which is a compensatory response to the alkalosis in an attempt to reduce carbon dioxide levels.

PaO2 55 mmHg: This is severely low, indicating hypoxemia (low oxygen levels in the blood), a hallmark of ARDS. HCO3 22 mEq/L: The bicarbonate is normal, suggesting that the metabolic component has not yet compensated for the respiratory alkalosis, or that it is in the early stages of compensation. Given these ABG results, the body is attempting to compensate for hypoxemia by increasing respiratory rate (tachypnea), which leads to hyperventilation and further reduction in PaCO2. Therefore, an expected assessment finding in this scenario would be a high respiratory rate (such as 32 breaths per minute), which is a compensatory response to hypoxemia.

C. Blood pressure 86/42 mmHg:
While hypotension can occur in severe cases of ARDS due to impaired oxygenation and circulation, it is not directly reflected by the ABG results provided. Hypoxemia and alkalosis would more likely lead to tachypnea and compensatory mechanisms like tachycardia, rather than significant hypotension unless there is another contributing factor, such as shock or sepsis. Therefore, hypotension is not the most expected finding based on these ABGs.

D. Heart rate of 45 beats per minute:
A heart rate of 45 beats per minute is bradycardic, which would be unusual in a patient with hypoxemia and respiratory alkalosis. Tachycardia is a more common compensatory response to hypoxia, as the heart works harder to improve oxygen delivery to tissues. A heart rate of 45 beats per minute would be more suggestive of a different underlying condition, such as vagal stimulation or cardiac conduction issues, but it is not the expected response in this case.

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Free Nursing Study Resources

Correct Answer is C

Explanation

A. "I will report any unusual movements or behaviors to my healthcare provider."
This statement is correct and indicates that the client understands the potential side effects of levodopa/carbidopa. The medication can cause dyskinesia (uncontrolled movements) and other behavioral changes, so the client should report these symptoms to their healthcare provider for possible adjustment of the treatment plan.

B. "I may experience nausea while taking this medication."
This is also correct. Nausea is a common side effect of levodopa/carbidopa, especially when starting the medication. Taking it with food may help reduce this side effect, but some clients may still experience nausea.

C. "I will take this medication with a high-protein meal."
This statement is incorrect. Levodopa is absorbed best on an empty stomach or with a low-protein meal. Protein can interfere with the absorption of levodopa because amino acids (found in proteins) compete with levodopa for absorption across the blood-brain barrier. Therefore, it's recommended that levodopa/carbidopa be taken either 30 minutes before or 1 hour after meals, especially those high in protein.

D. "I will avoid sudden changes in position to prevent dizziness or falls."
This statement is correct. Levodopa/carbidopa can cause orthostatic hypotension (a sudden drop in blood pressure when standing up), which increases the risk of dizziness and falls. The client should be advised to change positions slowly and use support when rising from a sitting or lying position to avoid injury.

A. pH 7,44; Pa02 44 mmHg: PaCO2 35 mmHg; HCO3 25 mEq/L; 02 Sat 76% B. pH 7.30; Pa02 80 mmHg; PaCO2 62 mmHg; HCO3 25 mEq/L; 02 Sat 94% C. pH 7.35; Pa02 65 mmHg; PaCO2 40 mmHg: HCO3 26 mEq/L; 02 Sat 90% D. PH 7.48; Pa02 75 mmHg; PaCO2 41 mmHg: HCO3 28 mEg/L; 02 Sat 9386

Correct Answer is A

Explanation

A. pH 7.44; PaO2 44 mmHg; PaCO2 35 mmHg; HCO3 25 mEq/L; O2 Sat 76%: This set of arterial blood gas (ABG) values is consistent with hypoxemic respiratory failure. Hypoxemic respiratory failure is characterized by a PaO2 less than 60 mmHg, and this client has a PaO2 of 44 mmHg, which is significantly below the normal range of 80-95 mmHg. Despite the fact that the client is on a 100% non-rebreather mask (which should ideally deliver high levels of oxygen), the low PaO2 suggests that oxygenation is not being effectively improved. Additionally, the low O2 saturation of 76% further supports the diagnosis of hypoxemic respiratory failure.

B. pH 7.30; PaO2 80 mmHg; PaCO2 62 mmHg; HCO3 25 mEq/L; O2 Sat 94%: This ABG indicates respiratory acidosis (pH is low, PaCO2 is elevated), but the PaO2 of 80 mmHg is within the normal range, and the O2 saturation of 94% is also normal. Respiratory acidosis with a normal PaO2 would indicate an issue with ventilation (hypoventilation), not hypoxemic respiratory failure. The patient is retaining CO2 but is still oxygenating well, so this result does not indicate hypoxemic respiratory failure.

C. pH 7.35; PaO2 65 mmHg; PaCO2 40 mmHg; HCO3 26 mEq/L; O2 Sat 90%: This result shows a PaO2 of 65 mmHg, which is mildly low but not sufficiently low to meet the criteria for hypoxemic respiratory failure (PaO2 should be below 60 mmHg for this diagnosis). The O2 saturation of 90% is also slightly low but not critically low. This client may have mild hypoxia but is not in respiratory failure based on these values.

D. pH 7.48; PaO2 75 mmHg; PaCO2 41 mmHg; HCO3 28 mEq/L; O2 Sat 93%: In this case, the PaO2 of 75 mmHg is slightly low but still within an acceptable range, and the O2 saturation of 93% is adequate. The elevated pH and normal PaCO2 suggest the presence of respiratory alkalosis (likely caused by hyperventilation). These ABG results are not consistent with hypoxemic respiratory failure, as the oxygen levels are still within a safe range.

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Naxlex Comprehensive Predictor Exams

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Correct Answer is C

Explanation

Correct Answer is A

Explanation

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