Sixty Minutes After a Patient Is Extubated,an Arterial Blood Gas

question 14

Multiple Choice

Sixty minutes after a patient is extubated,an arterial blood gas sample is drawn;the results are: pH = 7.20,PaCO₂ = 60 mm Hg,PaO₂ = 55 mm Hg,SaO₂ = 80%,HCO₃^- = 23 mEq/L with a 2 L/min nasal cannula.The patient is SOB and complaining of chest pain.His blood pressure is 92/50 mm Hg.The most likely cause of this weaning failure is which of the following?

• A) Chronic obstructive pulmonary disease
• B) Acute left ventricular failure
• C) Ventilatory muscle weakness
• D) Hypophosphatemia

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