A nurse admits an older adult to the ED and notes that the client is cyanotic and has a respiratory rate of 6 breaths/min. Which acid-base imbalance should the nurse associate with this finding?
respiratory acidosis
metabolic acidosis
respiratory alkalosis
metabolic alkalosis
The Correct Answer is A
Rationale:
A. Respiratory acidosis results from hypoventilation (respiratory rate of 6 breaths/min), leading to CO₂ retention and decreased blood pH. Cyanosis also indicates poor oxygenation, supporting this diagnosis.
B. Metabolic acidosis typically results from renal failure, diarrhea, or diabetic ketoacidosis, not directly from low respiratory rate.
C. Respiratory alkalosis is caused by hyperventilation, not hypoventilation.
D. Metabolic alkalosis is usually caused by vomiting or diuretic use and is not associated with decreased respiratory rate or cyanosis.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Rationale:
A. Circumoral numbness and tingling are typically associated with respiratory alkalosis, not acidosis.
B. Muscle flaccidity is more indicative of electrolyte imbalances or late-stage neurologic decline, but not a key early sign of respiratory acidosis.
C. Cool, clammy skin may occur with shock or hypoperfusion, but is not a hallmark sign of respiratory acidosis.
D. Decreased level of consciousness is a key manifestation of acute respiratory acidosis, as rising CO₂ levels depress the central nervous system, leading to confusion, lethargy, and eventually coma if untreated.
Correct Answer is D
Explanation
Rationale:
A. Bronchoscopy allows for direct visualization of the airways and may be used for sampling or clearing secretions but does not assess acid-base balance.
B. Pulmonary function tests evaluate lung volume and airflow but are not specific to acid-base status.
C. Pulse oximetry measures oxygen saturation, which reflects oxygenation but not CO₂ levels or pH status.
D. Arterial blood gases (ABGs) are the most accurate test for evaluating acid-base balance, as they provide values for pH, PaCO₂, HCO₃⁻, and PaO₂ — essential indicators in COPD management.
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