JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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In vitro study on the vaporization ratio of 2-microm laser in human prostatic tissue.

In this study, the vaporization ratio of the 2-mum laser in the prostatic tissue with benign prostatic hyperplasia was examined in vitro, to explore a technique to estimate the clearance rate of prostatic tissue during the transurethral vaporesection of the prostate. A total of 9 fresh prostatic tissue specimens were obtained by open surgery and the wet weight of the prostatic tissue were measured immediately after the sample collection. Under the simulated conditions of transurethral vaporesection of the prostate by 2-microm laser, each prostate gland was completely vaporesected into fragments with a diameter of less than 1.0 cm in vitro. After the vaporesection, the whole fragments of prostatic tissue were collected and measured. Then the lost weight of prostatic tissue, the weight of the collected prostatic tissue and the ratio of the lost weight of prostatic tissue to the wet weight of the prostate glandular organ specimen were calculated. The correlation between the weight of collected prostatic tissue and the weight of the whole glandular organ was analyzed. All the experimental procedures were carried out by one operator. Wet weight of the prostatic gland specimen and the weight of the harvested prostatic tissues after the procedure were recorded. With respect to the wet weight of prostate gland specimen, the percentage of the weight of collected prostatic tissue was (34.45 + or - 1.51) %, and the percentage of the lost weight of prostatic tissue was (65.55 + or - 1.51)%. Satisfactory linear relationship was observed between the weight of collected prostatic tissue and the wet weight of prostate gland specimen [y = 3.245 x -6.475 (t=15.097, P=0.000)]. It is concluded that under the simulated conditions of transurethral vaporesection of the prostate by 2-mum laser, the vaporization ratio of prostatic tissue can be calculated on the basis of the weight of collected prostatic tissue, and thereby the clearance of prostatic tissue during the formal operation by 2-microm laser could be quantitatively determined.

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