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EXPLANATION
✔Correct answer:
pH, 7.25; PaCO2 50 mm Hg .Respiratory acidosis occurs when the lungs cannot remove enough carbon dioxide (CO2) from the body, leading to an accumulation of CO2 in the blood. This results in a decrease in blood pH, making it more acidic. To confirm respiratory acidosis, Nurse Benson should look for a combination of low pH (indicating acidosis) and high PaCO2 (indicating hypercapnia).
ABG Values:
- pH: Normal range is 7.35 to 7.45. A pH lower than 7.35 indicates acidosis.
- PaCO2: Normal range is 35 to 45 mm Hg. A PaCO2 higher than 45 mm Hg indicates respiratory acidosis.
In this option, the pH is 7.25 (indicating acidosis), and the PaCO2 is 50 mm Hg (indicating elevated CO2 levels). This combination confirms respiratory acidosis.
Guillain-Barré syndrome can lead to muscle weakness, including the muscles that control breathing. When these muscles are weakened, the patient may not be able to breathe deeply or rapidly enough, resulting in reduced alveolar ventilation. This causes CO2 to accumulate in the blood, lowering the pH and leading to respiratory acidosis.
Think of the lungs as an air conditioning system that removes CO2 (waste gas) from the blood. If the air conditioner is not working well (muscle weakness from Guillain-Barré syndrome), CO2 builds up inside (blood), making the room hotter (more acidic pH).
Nurses must take specific steps to manage respiratory acidosis effectively.
- Monitor the client's respiratory status closely, including rate, depth, and effort of breathing.
- Administer oxygen as prescribed to improve oxygenation and reduce hypoxia.
- Encourage and assist with deep breathing exercises to enhance alveolar ventilation.
- Prepare for possible interventions such as noninvasive positive pressure ventilation (NPPV) or mechanical ventilation if necessary.
- Assess and manage potential underlying causes of reduced alveolar ventilation, such as muscle weakness or airway obstruction.
- Reassure and educate the client about their condition and the importance of following respiratory therapy protocols.
✘Incorrect answer options:
pH, 5.0; PaCO2 30 mm Hg This option is incorrect because a pH of 5.0 is not compatible with life. Additionally, a PaCO2 of 30 mm Hg indicates low CO2 levels, which would suggest respiratory alkalosis, not acidosis.
pH, 7.40; PaCO2 35 mm Hg This option is incorrect because both the pH and PaCO2 values are within the normal range. A normal pH of 7.40 does not indicate acidosis, and a PaCO2 of 35 mm Hg is normal.
pH, 7.35; PaCO2 40 mm Hg This option is incorrect because while the pH of 7.35 is on the lower end of the normal range, it does not indicate acidosis. Additionally, a PaCO2 of 40 mm Hg is within the normal range, not suggesting respiratory acidosis.
References
- Ignatavicius, D. D., Workman, M. L., Rebar, C. R., & Heimgartner, N. M. (2018). Medical-Surgical Nursing: Concepts for Interprofessional Collaborative Care. Elsevier.
- Lewis, S. L., Bucher, L., Heitkemper, M. M., & Harding, M. M. (2017). Medical-Surgical Nursing: Assessment and Management of Clinical Problems. Elsevier.