The nurse is reading the results of an arterial blood gas showing pH 7.52, CO2 25, and HCO3- 24. The nurse interprets this as which of the following

Respiratory acidosis

Metabolic acidosis

Respiratory alkalosis

Metabolic alkalosis

Answer and Explanation

The Correct Answer is C

A. Respiratory acidosis:
Respiratory acidosis is characterized by an increased CO2 level (above 45 mmHg) due to hypoventilation or impaired gas exchange, leading to a decrease in pH (below 7.35). In this case, the CO2 level is 25 mmHg, which is lower than normal and suggests a loss of CO2, not an accumulation. Therefore, respiratory acidosis is not the correct interpretation of these ABG results.
B. Metabolic acidosis:
Metabolic acidosis occurs when the pH drops below 7.35 due to conditions like kidney failure, diarrhea, or diabetic ketoacidosis. This would typically be accompanied by a low bicarbonate (HCO3-) level (less than 22 mEq/L). However, in this case, the pH is 7.52 (alkalotic), and the HCO3- level is 24 mEq/L, which is within the normal range. Thus, metabolic acidosis is not the correct interpretation.

C. Respiratory alkalosis:
Respiratory alkalosis is characterized by a decrease in CO2 (less than 35 mmHg) due to hyperventilation, which causes an increase in pH (above 7.45). In this case, the pH is 7.52 (alkalotic), and the CO2 is 25 mmHg, which is lower than the normal range (35–45 mmHg). The bicarbonate (HCO3-) level is 24 mEq/L, which is normal and compensatory. This matches the pattern of respiratory alkalosis, where the body compensates with a normal bicarbonate level as CO2 decreases.

D. Metabolic alkalosis:
Metabolic alkalosis occurs when the pH rises above 7.45, often due to excessive vomiting, diuretic use, or antacid overuse, leading to an increase in bicarbonate (HCO3-) levels. While the pH is 7.52, indicating alkalosis, the bicarbonate (HCO3-) level is 24 mEq/L, which is within the normal range for bicarbonate. In metabolic alkalosis, you would typically see an elevated HCO3- level, which is not the case here. Therefore, metabolic alkalosis is not the correct interpretation of these ABG results.

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Correct Answer is C

Explanation

A) "Complete blood count (CBC)":
. A CBC can provide important information about the patient's overall health, including potential signs of infection, anemia, or other underlying conditions. However, in the context of acute neurological symptoms such as left-sided weakness, CT scan is the priority test because it will help quickly determine if there is an acute neurological event, such as a stroke or hemorrhage. While a CBC might be useful later to assess for underlying
conditions or potential causes, it is not the first test to perform in this scenario.

B) "Electroencephalogram (EEG)":
. An EEG is primarily used to diagnose and assess seizure activity or epileptic disorders. While seizures can cause neurological deficits, the patient's sudden onset of left-sided weakness is more suggestive of a stroke, not a seizure. The priority is to rule out stroke with a CT scan, not to assess for seizures with an EEG.

C) "Computed tomography (CT) scan":
. A CT scan is the first diagnostic test to perform in patients with acute neurological deficits such as sudden-onset weakness, especially when a stroke is suspected. A CT scan can quickly detect if the cause is an ischemic stroke (lack of blood flow due to a clot) or a hemorrhagic stroke (bleeding in the brain). Time is critical in the management of stroke, as early intervention with treatments like tPA (tissue plasminogen activator) for ischemic stroke can greatly improve outcomes. The CT scan can help determine if the patient is a candidate for thrombolysis or if other interventions are needed.

D) "Chest radiograph (chest x-ray)":
. While a chest x-ray can be useful for diagnosing respiratory issues, such as pneumonia or congestion, it is not helpful in evaluating the cause of acute neurological symptoms like left-sided weakness. The priority test is a CT scan to evaluate the brain and rule out conditions like stroke or hemorrhage, not a chest x-ray.

A. "The test will use a catheter to assess for blocked coronary arteries B. The test can show how well your heart pumps blood." C. The test will show proteins in the blood from damaged heart muscle. D. The test shows the electrical activity of the heart from multiple angles”

Correct Answer is B

Explanation

A) "The test will use a catheter to assess for blocked coronary arteries": This statement is incorrect. An echocardiogram does not involve the use of a catheter. It is a non-invasive imaging test that uses sound waves (ultrasound) to create images of the heart's structure and function. Assessing for blocked coronary arteries typically requires a different procedure, such as a coronary angiogram, which involves the use of a catheter.

B) "The test can show how well your heart pumps blood.": This is the correct statement. An echocardiogram is primarily used to assess how well the heart is functioning, including how effectively it pumps blood. It can provide detailed images of the heart's chambers, valves, and blood flow, helping to evaluate conditions such as heart failure, valve dysfunction, and other structural issues that may impair the heart’s ability to pump blood efficiently.
C) "The test will show proteins in the blood from damaged heart muscle.": This statement is incorrect. An echocardiogram does not measure blood proteins or markers from damaged heart muscle. Blood tests, such as troponin levels, are used to detect proteins released from heart muscle after injury, such as in a heart attack. The echocardiogram focuses on the heart's structure and function, not the chemical markers in the blood.

D) "The test shows the electrical activity of the heart from multiple angles.": This statement is inaccurate. The electrical activity of the heart is assessed by an electrocardiogram (ECG or EKG), not an echocardiogram. An ECG records the heart's electrical signals, while an echocardiogram uses sound waves to visualize the heart's anatomical structure and function.

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The nurse is reading the results of an arterial blood gas showing pH 7.52, CO2 25, and HCO3- 24. The nurse interprets this as which of the following

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