Murphy - Figure 19
>20 Pack Year History
FIG. 19: The patients enrolled into HOT-HMV needed to have hospital admission principally for COPD, with demonstrable evidence of COPD as defined by (1) a history of >20 pack years of cigarette smoking; and (2) severe airflow obstruction defined by an FEV1 <50% predicted and an FEV1/FVC <60%.[1]
Murphy P. Chest 2017:00.
References
[1]
Murphy P, Arbane G, Bourke S, et al. Effect of home non-invasive ventilation with oxygen therapy vs oxygen therapy alone on hospital readmission or death after an acute COPD exacerbation: a randomized controlled trial. JAMA. In press.