The nurse is reviewing the arterial blood gas (ABG) result for a client currently on a 100% non-rebreather mask. The nurse is able to interpret which of the following results as hypoxemic respiratory failure?

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%

pH 7,44; Pa02 44 mmHg: PaCO2 35 mmHg; HCO3 25 mEq/L; 02 Sat 76%

pH 7.30; Pa02 80 mmHg; PaCO2 62 mmHg; HCO3 25 mEq/L; 02 Sat 94%

pH 7.35; Pa02 65 mmHg; PaCO2 40 mmHg: HCO3 26 mEq/L; 02 Sat 90%

PH 7.48; Pa02 75 mmHg; PaCO2 41 mmHg: HCO3 28 mEg/L; 02 Sat 9386

Answer and Explanation

The Correct Answer is A

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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Correct Answer is C

Explanation

A. Expect fluctuations of symptoms with temperature change: While symptom fluctuations may occur due to various factors, temperature changes are not a hallmark feature of Huntington's Disease (HD). HD is characterized by progressive motor, cognitive, and psychiatric symptoms, including involuntary movements (chorea), cognitive decline, and mood disturbances. Although other neurological conditions may show symptom fluctuations with temperature changes, this is not specific to HD.

B. New surgical techniques offer the best hope for a cure: There are currently no cures for Huntington's Disease, and while medical management can help manage symptoms (such as using medications for chorea or psychiatric symptoms), surgical techniques do not offer a cure for HD. The disease is progressive, and interventions typically focus on symptom management rather than cure. Families should be informed that while research is ongoing, a cure is not currently available.

C. Information about genetic testing: Huntington's Disease (HD) is a genetic disorder caused by a mutation in the HTT gene. It is inherited in an autosomal dominant pattern, meaning that a person with a parent who has HD has a 50% chance of inheriting the disease. Genetic testing is a critical part of the diagnosis process, and it can confirm the presence of the mutated gene before symptoms appear, which is important for family planning and early intervention. However, while genetic testing can provide information about whether an individual will develop the disease, it does not alter the course of the disease or provide a cure. It is essential to provide this information to clients and families, so they understand the role of genetic counseling and testing in managing the disease.

D. The disease process is intense but short in duration: Huntington's Disease is progressive and long-lasting. The disease usually begins in mid-adulthood (typically between ages 30-50), and the symptoms worsen over time. Individuals with HD may live for 15-20 years after symptom onset. The disease duration is long-term, not short, and it becomes increasingly debilitating as it progresses. The intensity of symptoms increases over time, and the disease is not characterized by a short duration.

A. Encourage the daily use of the incentive spirometer B. Assisting the client with ambulation in the hallway C. Increasing the chest tube suction to 44 mmHg D. Assessing for adequate pain relief

Correct Answer is D

Explanation

A. Encourage the daily use of the incentive spirometer: While the use of an incentive spirometer is important for improving lung expansion and preventing atelectasis, it may not be effective unless the client’s pain is well-managed. If pain is not addressed first, the client may be unable or unwilling to use the incentive spirometer properly, thus delaying recovery and increasing the risk of respiratory complications.

B. Assisting the client with ambulation in the hallway: Ambulation is an important post-operative activity for improving circulation and preventing complications such as deep vein thrombosis (DVT) or pneumonia. However, the priority at this time should be addressing the client's pain and ensuring adequate breathing before attempting more strenuous activities like ambulation. If the client is in pain and not breathing effectively, ambulation could exacerbate respiratory difficulties..

C. Increasing the chest tube suction to 44 mmHg: Increasing chest tube suction is not indicated unless there is evidence of inadequate drainage or a specific complication, such as a pneumothorax or pleural effusion. In this case, the priority is to address the client’s respiratory function, which is more likely to improve with pain relief, deep breathing, and appropriate positioning. Suctioning should only be adjusted if there is a clinical reason such as signs of a pneumothorax or inadequate drainage, which is not indicated by the information provided.

D. Assessing for adequate pain relief: The most urgent intervention in this scenario is ensuring that the client has adequate pain relief. The client’s shallow respirations and guarding of the operative site suggest that pain is inhibiting effective breathing and deep inspiration, which is crucial for preventing atelectasis and improving ventilation. Pain control is essential in promoting optimal respiratory function, as uncontrolled pain can lead to shallow breathing, reduced lung expansion, and compromised gas exchange, all of which can increase the risk of acute respiratory failure. Once pain is managed, the client will be better able to engage in other respiratory interventions

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Naxlex Comprehensive Predictor Exams

The nurse is teaching the client and family about Huntington's Disease (HD). What information should the nurse include?

Correct Answer is C

Explanation

Correct Answer is D

Explanation

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