[The feasibility study of estimating energy consumption in photoselective vaporization of prostate based on the volume of prostate].

Objective: To discuss the feasibility of estimating energy consumption of green laser in photoselective vaporization of prostate (PVP) based on the preoperative volume of prostate.

Methods: From January 2005 to January 2007, 260 patients with benign prostatic hyperplasia (BPH) had been treated with PVP. Preoperative prostatic volume and post-two-weeks-operative prostatic volume of each patient were measured by transrectal ultrasound (TRUS). Energy consumption and emission time of green laser were recorded during the operation. Then we calculated the amount of energy consumption needed in vaporizing one gramme prostatic tissue, evaluated the correlation of energy consumption and preoperative volume of prostate by means of correlation-regression analysis, and established its regression equation.

Results: The amount of energy consumption needed in vaporizing one gramme prostatic tissue was (6.9 ± 0.6)kJ. The correlation of energy consumption and preoperative volume of prostate was significantly positive linear correlated. Its regression equation was: Energy Consumption (kJ) = 4.7 x Preoperative Volume of Prostate (cm³) - 14.1.

Conclusion: It is feasible to estimate energy consumption of green laser in PVP based on preoperative volume of prostate.