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Difficulty: MediumReduction of Risk Potential

A nurse is reviewing diagnostic data for a 72-year-old client admitted with a severe exacerbation of chronic obstructive pulmonary disease (COPD). The client is currently receiving continuous oxygen therapy. Which of the following arterial blood gas (ABG) results represents an acute physiological decompensation that requires the most immediate intervention by the nurse?

  1. pH 7.26, PaCO2 72 mm Hg, HCO3 32 mEq/L, PaO2 50 mm HgAnswer
  2. B
    pH 7.35, PaCO2 60 mm Hg, HCO3 32 mEq/L, PaO2 62 mm Hg
  3. C
    pH 7.48, PaCO2 32 mm Hg, HCO3 23 mEq/L, PaO2 78 mm Hg
  4. D
    pH 7.44, PaCO2 46 mm Hg, HCO3 30 mEq/L, PaO2 65 mm Hg

Answer

The ABG result showing a pH of 7.26, PaCO2 of 72 mm Hg, HCO3 of 32 mEq/L, and PaO2 of 50 mm Hg.
The values showing a pH of 7.26, PaCO2 of 72 mm Hg, HCO3 of 32 mEq/L, and PaO2 of 50 mm Hg indicate an acute-on-chronic respiratory acidosis with severe hypoxemia. Despite the elevated bicarbonate (indicating long-term renal compensation), the low pH demonstrates that the client's respiratory system is currently failing to maintain acid-base balance. This represents a life-threatening emergency requiring immediate respiratory support, such as noninvasive positive pressure ventilation (BiPAP) or intubation.

Step-by-Step Solution

1
Determine the client's expected baseline based on their diagnosis.
Clients with severe COPD typically retain carbon dioxide, leading to chronic respiratory acidosis with metabolic compensation (normal pH, elevated PaCO2, elevated HCO3).
Establishing the baseline helps differentiate between a chronic stable state and an acute exacerbation.
2
Analyze each ABG result for uncompensated or acute changes.
Identify which set of values demonstrates a failure to maintain acid-base balance (abnormal pH) and profound oxygenation failure.
Acute physiological decompensation is marked by sudden shifts outside the body's compensatory mechanisms.
3
Prioritize the most life-threatening finding.
A significantly acidic pH combined with severe hypoxemia indicates impending respiratory arrest, requiring the highest priority intervention.
Airway and breathing emergencies take absolute precedence in risk reduction.

Key Concept

Arterial Blood Gas Interpretation in COPD
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Topics

Reduction of Risk Potential

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