A nurse is reviewing the laboratory results of a client who is postoperative and has a respiratory rate of 7/min. The arteriaI blood gas (ABG) values include:

pH 7.22

PaCO2 68 mm Hg

Base excess -2

PaO2 78 mm Hg

Oxygen saturation 80%

Bicarbonate 28 mEq/L

Which of the following interpretations of the ABG values should the nurse make7

Metabolic acidosis

Respiratory acidosis

Respiratory alkalosis

Metabolic alkalosis

Answer and Explanation

The Correct Answer is B

A. Metabolic acidosis:

Metabolic acidosis is characterized by a low pH (<7.35) and a low bicarbonate level (<22 mEq/L) due to an excess of acids in the body or a loss of bicarbonate. However, in the given ABG values, the pH is low (7.22), but the bicarbonate level is elevated (28 mEq/L), which does not align with metabolic acidosis. Therefore, metabolic acidosis is not the correct interpretation in this case.

B. Respiratory acidosis:

Respiratory acidosis occurs when there is inadequate removal of carbon dioxide (CO2) by the lungs, leading to an accumulation of CO2 in the blood and a decrease in pH. In the ABG values provided, the pH is low (7.22), and the PaCO2 is elevated (68 mm Hg), indicating respiratory acidosis as the primary disturbance. This interpretation is supported by the elevated PaCO2 and the low pH, making it the correct choice based on the given data.

C. Respiratory alkalosis:

Respiratory alkalosis results from hyperventilation, leading to excessive elimination of CO2 and a decrease in PaCO2 levels. However, in the ABG values presented, the PaCO2 is elevated (68 mm Hg), which contradicts the expected decrease seen in respiratory alkalosis. Therefore, respiratory alkalosis is not the correct interpretation of the ABG values in this case.

D. Metabolic alkalosis:

Metabolic alkalosis is characterized by a high pH (>7.45) and a high bicarbonate level (>26 mEq/L) due to excessive loss of acids or an increase in bicarbonate levels. However, in the ABG values provided, the pH is low (7.22), and the bicarbonate level is elevated (28 mEq/L), which is not consistent with metabolic alkalosis. Therefore, metabolic alkalosis is not the correct interpretation based on the given data.

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Correct Answer is A

Explanation

A. Urine output is greater than 0.5 mL/kg/hr

During the fluid resuscitation phase of burn management, one of the primary goals is to maintain adequate tissue perfusion and organ function by ensuring sufficient fluid intake. The best method for assessing the results of fluid resuscitation is by monitoring urine output. A urine output of greater than 0.5 mL/kg/hr is indicative of adequate renal perfusion and kidney function, suggesting that fluid resuscitation is effective in maintaining tissue perfusion and preventing complications such as acute kidney injury.

B. Serum hemoglobin is 11 gm/dL

Serum hemoglobin levels can be affected by various factors, including fluid resuscitation, blood loss, and other medical conditions. While monitoring hemoglobin levels is important in overall patient assessment, it is not the best method specifically for assessing the results of fluid resuscitation during the initial phase of burn management.

C. Breath sounds are clear bilaterally

Clear bilateral breath sounds indicate adequate lung function and ventilation but may not directly reflect the effectiveness of fluid resuscitation in maintaining tissue perfusion. Lung sounds can be influenced by factors such as lung injury from smoke inhalation or mechanical ventilation settings, which may not correlate directly with fluid resuscitation outcomes.

D. Heart rate is 122/min

Heart rate can be influenced by various factors such as pain, stress, medications, and underlying medical conditions. While monitoring heart rate is important in assessing patient status, it is not the most reliable method for specifically evaluating the results of fluid resuscitation during the fluid resuscitation phase of burn management.

A. Body mass index (BMI) of 19 B. History of deep vein thrombosis C. Aged 55 years old D. Type 2 diabetes mellitus

Correct Answer is D

Explanation

A. Body mass index (BMI) of 19:

A BMI of 19 falls within the normal weight range. While obesity (high BMI) is a known risk factor for surgical complications, including SSIs, having a lower BMI (underweight) like 19 may not directly increase the risk of SSIs. However, extreme malnutrition or low BMI due to underlying health conditions could potentially impact wound healing and immune function, indirectly contributing to infection risk.

B. History of deep vein thrombosis (DVT):

A history of deep vein thrombosis is a risk factor for surgical complications, including SSIs. Patients with a history of DVT may have impaired circulation or underlying vascular issues, which can affect tissue perfusion, wound healing, and increase the risk of infections.

C. Aged 55 years old:

Age is a risk factor for surgical complications, including SSIs. Older adults, typically defined as those aged 65 and above, may have reduced immune function, slower wound healing, and underlying health conditions that contribute to infection risk. While 55 years old is not considered advanced age in terms of surgical risk, older age in general is associated with a higher risk of complications.

D. Type 2 diabetes mellitus:

Type 2 diabetes mellitus is a significant risk factor for SSIs. Diabetes can impair immune function, delay wound healing, and increase susceptibility to infections. Poorly controlled blood sugar levels in diabetic patients can further exacerbate the risk of SSIs post-surgery.

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