From the authors

I. Garcia-Talavera's reaction to the results of our trial of ambulatory oxygen (AO) in oxygen-dependent chronic obstructive pulmonary disease (COPD) is of no surprise to us. We realise that our findings, i.e. that as-needed AO provided for a period of 3 months had no effect on quality of life and walked distance 1, are against the stream of current guidelines ( i.e. that active patients receiving long-term oxygen therapy should have both stationary and mobile systems of oxygen delivery) 2 …