An ABG analysis shows : pH 7.2, raised pCO2, decreased HCO3; diagnosis is
**Core Concept**
The given arterial blood gas (ABG) analysis indicates a state of acidosis, characterized by a low pH, elevated pCO2, and decreased bicarbonate (HCO3) levels. This pattern suggests a respiratory acidosis with a metabolic component.
**Why the Correct Answer is Right**
Given the elevated pCO2 and decreased HCO3, this scenario points towards a mixed disorder but primarily indicates a respiratory issue due to the high pCO2, which is a sign of hypoventilation. The decrease in HCO3 suggests a compensatory or a concurrent metabolic component.
**Why Each Wrong Option is Incorrect**
**Option A:** This would typically represent a metabolic acidosis with some respiratory compensation, not primarily a respiratory issue.
**Option B:** This option would be more indicative of a pure metabolic acidosis.
**Option C:** This could represent a mixed disorder but is not the best match given the information.
**Clinical Pearl / High-Yield Fact**
In interpreting ABG results, it's crucial to consider the pH, pCO2, and HCO3 levels together to determine the acid-base disorder. A high pCO2 indicates respiratory acidosis, while a low HCO3 suggests metabolic acidosis.
**Correct Answer:** D. Respiratory Acidosis