FCEM2-1800

A 72 year old female who is a known heavy smoker visits the emergency department. She has experienced a worsening productive cough for the past week and feels breathless. An arterial blood gas is obtained and the results are as follows:

Parameter Result
pH 7.31
pO2 9.1 kPa
pCO2 6.5 kPa
Bicarbonate 32 mmol/l
Base Excess +4

Which of the following options most accurately characterizes this blood gas result?