Pereira-Correia JA et al. conducted a prospective urodynamic based trial comparing TURP and GreenLight laser PVP in total number of 20 patients over 2 years. In this study the older generation of the GreenLight laser (HPS) was utilized and conventional PVP technique was applied looking for the urodynamic changes between Greenlight PVP and TURP. They reported that high-power PVP can achieve and maintain the same results as TURP over a period of 24 months as regards improvement of infravesical obstruction evidenced by reduction of mean micturition pressure and bladder outlet obstruction index (BOOI).