<qa>  What is the drawback of LVRS?In addition to medical therapies, there are two surgical therapies available to emphysema sufferers: Lung transplantation and Lung Volume Reduction Surgery LVRS. In the National Emphysema Treatment Trial NETT, LVRS was shown to be effective in a sub-set of emphysema patients, but it had the drawback of increased short-term mortality as compared to the medical control arm. This was likely due to the invasiveness of LVRS. 