The following condition is not associated with an increased anion-gap type of metabolic acidosis?: (A) Shock, (B) Ingestion of ante-freeze, (C) Diabetic ketoacidosis, (D) COPD
Answer is D. In COPD blood pH is usually maintained within the normal range in spite of increased PaCO2 because of renal compensation which leads to retention of bicarbonatesRef: Harrison's 18/e p369