The nurse is caring for a client with the following arterial blood gas (ABG) results: pH 7.32, PaCO2 33 mmHg, Pa02 88 mmHg, HCO3 16 mEg/L. The nurse would Interpret these results as:

Table 9.9 Normal Arterial Blood Gas Values

ABG Value.                                                             Normal Value

pH                                                                             7.35-7.45

PaCO2                                                                                                            35-45 mmHg

HCO3-                                                                         22-25mEq/L

Base excess                                                               -2 to +2

PaO2                                                                            80-95 mmHg

SaO2                                                                            >95%

fully compensated respiratory acidosis.

partially compensated respiratory acidosis.

uncompensated metabolic acidosis.

partially compensated metabolic acidosis.

Answer and Explanation

The Correct Answer is D

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 A

Explanation

A. Sublingual nitroglycerin each day to prevent chest pain:
The statement about taking sublingual nitroglycerin daily is incorrect. Sublingual nitroglycerin is prescribed as needed for acute chest pain (angina) or for relieving chest discomfort associated with myocardial infarction (MI). It is not intended for daily use as a preventive measure. The client should be educated to use sublingual nitroglycerin only when experiencing chest pain, and if the pain persists or worsens, they should seek immediate medical help. Daily or routine use of nitroglycerin should be avoided unless specifically instructed by a healthcare provider. The client should also be educated about other preventive measures like long-acting nitrates if needed for chest pain prevention.

Explanation of other options:

B. Clopidogrel to prevent clots from forming:
This statement is correct. Clopidogrel (Plavix) is an antiplatelet medication commonly prescribed after a myocardial infarction to help prevent the formation of blood clots, which can reduce the risk of future cardiovascular events such as stroke or further heart attacks. It works by inhibiting platelets from clumping together, which is crucial in the post-MI period.

C. Atorvastatin at bedtime to reduce my cholesterol levels:
This statement is correct. Atorvastatin is a statin medication that is used to lower cholesterol levels, particularly LDL cholesterol (the "bad" cholesterol), which contributes to atherosclerosis and increases the risk of further heart problems. Statins are often prescribed after a myocardial infarction to help reduce the risk of future events. Taking atorvastatin at bedtime is also a common recommendation because cholesterol synthesis is higher during the night.

D. Metoprolol to decrease my heart's need for oxygen:
This statement is correct. Metoprolol is a beta-blocker that reduces the heart rate and blood pressure, which in turn lowers the heart's oxygen demand. After a myocardial infarction, beta-blockers like metoprolol are commonly prescribed to prevent further heart damage, reduce ischemia, and decrease the likelihood of arrhythmias. They help in the management of heart failure as well by improving the heart's efficiency.

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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Correct Answer is A

Explanation

Correct Answer is A

Explanation

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