A 62-year-old man named John with a history of COPD is admitted for worsening shortness of breath. John's recent arterial blood gas (ABG) Indicates a PaCO2 level of 55 mmHg. Which of the following mechanisms is most compromised In John's respiratory system?
Mucociliary clearance system
Chemoreceptors response to changes in PaCO2
Reflex bronchoconstriction
Filtration of air
The Correct Answer is B
A. While impaired mucociliary clearance can contribute to respiratory symptoms in COPD, it is not directly reflected in the PaCO2 level.
B. In COPD, the respiratory drive can be blunted, leading to inadequate response to elevated PaCO2 levels by the chemoreceptors.
C. Reflex bronchoconstriction may occur in response to various stimuli but is not directly related to the PaCO2 level.
D. Filtration of air primarily refers to the removal of particulate matter and pathogens by the respiratory system and is not directly related to PaCO2 levels.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Elevated C-reactive protein levels are not directly associated with an increased risk of hemorrhage.
B. C-reactive protein elevation is not indicative of an allergic response to medication.
C. C-reactive protein levels do not directly correlate with dehydration or fluid imbalance.
D. Elevated C-reactive protein levels are often seen in response to inflammation, including that caused by infection. In a post-operative patient, this elevation could indicate the early stages of an infection, and thus should be a priority concern for the nurse.
Correct Answer is C
Explanation
A. Tonsillitis presents with sore throat, difficulty swallowing, and inflamed tonsils, but it is not typically associated with ear pain, tenderness behind the ear, or a history of recurrent ear infections.
B. Allergic rhinitis typically presents with nasal congestion, sneezing, and itchy, watery eyes, but it does not cause chronic ear pain or tenderness behind the ear.
C. Chronic ear pain, tenderness behind the ear, and a history of recurrent ear infections suggest dysfunction of the Eustachian tube, which can lead to fluid accumulation and pressure changes in the middle ear.
D. Labyrinthitis presents with vertigo, nausea, and hearing loss, which are not mentioned in Susan's symptoms.
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