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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The evaluation of tissue mass loss in the incision line of prostate with benign hyperplasia performed using holmium laser and cutting electrode</title><author><name sortKey="Szewczyk, Mariusz" sort="Szewczyk, Mariusz" uniqKey="Szewczyk M" first="Mariusz" last="Szewczyk">Mariusz Szewczyk</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="Jesionek Upnicka, Dorota" sort="Jesionek Upnicka, Dorota" uniqKey="Jesionek Upnicka D" first="Dorota" last="Jesionek Upnicka">Dorota Jesionek Upnicka</name><affiliation><nlm:aff id="AF0002">Pathology Unit and Department of Oncology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="Lipi Ski, Marek Ireneusz" sort="Lipi Ski, Marek Ireneusz" uniqKey="Lipi Ski M" first="Marek Ireneusz" last="Lipi Ski">Marek Ireneusz Lipi Ski</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="Lipinski, Piotr" sort="Lipinski, Piotr" uniqKey="Lipinski P" first="Piotr" last="Lipinski">Piotr Lipinski</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="R A Ski, Waldemar" sort="R A Ski, Waldemar" uniqKey="R A Ski W" first="Waldemar" last="R A Ski">Waldemar R A Ski</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25247088</idno><idno type="pmc">4165671</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4165671</idno><idno type="RBID">PMC:4165671</idno><idno type="doi">10.5173/ceju.2014.03.art14</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000357</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000357</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The evaluation of tissue mass loss in the incision line of prostate with benign hyperplasia performed using holmium laser and cutting electrode</title><author><name sortKey="Szewczyk, Mariusz" sort="Szewczyk, Mariusz" uniqKey="Szewczyk M" first="Mariusz" last="Szewczyk">Mariusz Szewczyk</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="Jesionek Upnicka, Dorota" sort="Jesionek Upnicka, Dorota" uniqKey="Jesionek Upnicka D" first="Dorota" last="Jesionek Upnicka">Dorota Jesionek Upnicka</name><affiliation><nlm:aff id="AF0002">Pathology Unit and Department of Oncology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="Lipi Ski, Marek Ireneusz" sort="Lipi Ski, Marek Ireneusz" uniqKey="Lipi Ski M" first="Marek Ireneusz" last="Lipi Ski">Marek Ireneusz Lipi Ski</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="Lipinski, Piotr" sort="Lipinski, Piotr" uniqKey="Lipinski P" first="Piotr" last="Lipinski">Piotr Lipinski</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author><author><name sortKey="R A Ski, Waldemar" sort="R A Ski, Waldemar" uniqKey="R A Ski W" first="Waldemar" last="R A Ski">Waldemar R A Ski</name><affiliation><nlm:aff id="AF0001">2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</nlm:aff></affiliation></author></analytic><series><title level="j">Central European Journal of Urology</title><idno type="ISSN">2080-4806</idno><idno type="eISSN">2080-4873</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec id="st1"><title>Introduction</title><p>The aim of this study is to compare the changes in the incision line of prostatic adenoma using a monopolar cutting electrode and holmium laser, as well as the assessment of associated tissue mass and volume loss of benign prostatic hyperplasia (BPH).</p></sec><sec id="st2"><title>Material and methods</title><p>The material used in this study consisted of 74 preparations of prostatic adenoma obtained via open retropubic adenomectomy, with an average volume of 120.7 ml. The material obtained cut in vitro before fixation in formaldehyde. One lobe was cut using holmium laser, the other using a monopolar cutting electrode. After the incision was made, tissue mass and volume loss were evaluated. Thermocoagulation changes in the incision line were examinedunder light microscope.</p></sec><sec id="st3"><title>Results</title><p>In the case of the holmium laser incision, the average tissue mass loss was 1.73 g, tissue volume loss 3.57 ml and the depth of thermocoagulation was 1.17 mm. When the monopolar cutting electrode was used average tissue mass loss was 0.807 g, tissue volume loss 2.48 ml and the depth of thermocoagulation was 0.19 mm.</p></sec><sec id="st4"><title>Conclusions</title><p>Where holmium laser was used, it was observed that the layer of tissue with thermocoagulation changes was deeper than in the case of the monopolar cutting electrode. Moreover, it was noticed that holmium laser caused bigger tissue mass and volume loss than the cutting electrode.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Lepor, H" uniqKey="Lepor H">H Lepor</name></author><author><name sortKey="Rigaud, G" uniqKey="Rigaud G">G Rigaud</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Rassweiler, J" uniqKey="Rassweiler J">J Rassweiler</name></author><author><name sortKey="Teber, D" uniqKey="Teber D">D Teber</name></author><author><name sortKey="Kuntz, R" uniqKey="Kuntz R">R Kuntz</name></author><author><name sortKey="Hofmann, R" uniqKey="Hofmann R">R Hofmann</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Tubaro, A" uniqKey="Tubaro A">A Tubaro</name></author><author><name sortKey="De Nunizio, C" uniqKey="De Nunizio C">C de Nunizio</name></author></analytic></biblStruct><biblStruct><analytic><author><name 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sortKey="Wrona, M" uniqKey="Wrona M">M Wrona</name></author><author><name sortKey="Lipinski, M" uniqKey="Lipinski M">M Lipinski</name></author><author><name sortKey="R Za Ski, W" uniqKey="R Za Ski W">W Rózański</name></author></analytic></biblStruct></listBibl></div1></back></TEI><pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Cent European J Urol</journal-id><journal-id journal-id-type="iso-abbrev">Cent European J Urol</journal-id><journal-id journal-id-type="publisher-id">CEJU</journal-id><journal-title-group><journal-title>Central European Journal of Urology</journal-title></journal-title-group><issn pub-type="ppub">2080-4806</issn><issn pub-type="epub">2080-4873</issn><publisher><publisher-name>Polish Urological Association</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25247088</article-id><article-id pub-id-type="pmc">4165671</article-id><article-id pub-id-type="publisher-id">00351</article-id><article-id pub-id-type="doi">10.5173/ceju.2014.03.art14</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Paper</subject></subj-group></article-categories><title-group><article-title>The evaluation of tissue mass loss in the incision line of prostate with benign hyperplasia performed using holmium laser and cutting electrode</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Szewczyk</surname><given-names>Mariusz</given-names></name><xref ref-type="aff" rid="AF0001">1</xref></contrib><contrib contrib-type="author"><name><surname>Jesionek–Kupnicka</surname><given-names>Dorota</given-names></name><xref ref-type="aff" rid="AF0002">2</xref></contrib><contrib contrib-type="author" corresp="yes"><name><surname>Lipiński</surname><given-names>Marek Ireneusz</given-names></name><xref ref-type="aff" rid="AF0001">1</xref></contrib><contrib contrib-type="author"><name><surname>Lipinski</surname><given-names>Piotr</given-names></name><xref ref-type="aff" rid="AF0001">1</xref></contrib><contrib contrib-type="author"><name><surname>Różański</surname><given-names>Waldemar</given-names></name><xref ref-type="aff" rid="AF0001">1</xref></contrib></contrib-group><aff id="AF0001"><label>1</label>2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, Poland</aff><aff id="AF0002"><label>2</label>Pathology Unit and Department of Oncology, Medical University of Łódź, Poland</aff><author-notes><corresp id="cor1"><bold>Correspondence</bold> Marek Lipiński, 2<sup>nd</sup> Clinic of Urology, Medical University of Łódź, 63, Pabianicka Street. phone: + 48 42 689 52 11. <email xlink:href="miklipa@poczta.onet.pl">miklipa@poczta.onet.pl</email></corresp></author-notes><pub-date pub-type="epub"><day>18</day><month>8</month><year>2014</year></pub-date><pub-date pub-type="ppub"><year>2014</year></pub-date><volume>67</volume><issue>3</issue><fpage>282</fpage><lpage>286</lpage><history><date date-type="received"><day>03</day><month>2</month><year>2014</year></date><date date-type="rev-recd"><day>07</day><month>6</month><year>2014</year></date><date date-type="accepted"><day>14</day><month>6</month><year>2014</year></date></history><permissions><copyright-statement>Copyright by Polish Urological Association</copyright-statement><copyright-year>2014</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License, permitting all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><sec id="st1"><title>Introduction</title><p>The aim of this study is to compare the changes in the incision line of prostatic adenoma using a monopolar cutting electrode and holmium laser, as well as the assessment of associated tissue mass and volume loss of benign prostatic hyperplasia (BPH).</p></sec><sec id="st2"><title>Material and methods</title><p>The material used in this study consisted of 74 preparations of prostatic adenoma obtained via open retropubic adenomectomy, with an average volume of 120.7 ml. The material obtained cut in vitro before fixation in formaldehyde. One lobe was cut using holmium laser, the other using a monopolar cutting electrode. After the incision was made, tissue mass and volume loss were evaluated. Thermocoagulation changes in the incision line were examinedunder light microscope.</p></sec><sec id="st3"><title>Results</title><p>In the case of the holmium laser incision, the average tissue mass loss was 1.73 g, tissue volume loss 3.57 ml and the depth of thermocoagulation was 1.17 mm. When the monopolar cutting electrode was used average tissue mass loss was 0.807 g, tissue volume loss 2.48 ml and the depth of thermocoagulation was 0.19 mm.</p></sec><sec id="st4"><title>Conclusions</title><p>Where holmium laser was used, it was observed that the layer of tissue with thermocoagulation changes was deeper than in the case of the monopolar cutting electrode. Moreover, it was noticed that holmium laser caused bigger tissue mass and volume loss than the cutting electrode.</p></sec></abstract><kwd-group><kwd>BPH</kwd><kwd>holmium laser</kwd><kwd>TURP</kwd><kwd>prostate</kwd><kwd>mass loss</kwd></kwd-group></article-meta></front><body><sec sec-type="intro" id="S0001"><title>INTRODUCTION</title><p>Both in the 20<sup>th</sup> and the beginning of the 21<sup>st</sup> century, transurethral resection of the prostate (TURP) has been the gold standard in the surgical treatment of prostatic adenoma [<xref rid="CIT0001" ref-type="bibr">1</xref>, <xref rid="CIT0002" ref-type="bibr">2</xref>]. Surgical treatment is still used, especially in particularly large adenomas and adenomas accompanied by other urinary bladder diseases [<xref rid="CIT0003" ref-type="bibr">3</xref>]. The development of new technologies in medicine, such as the adaptation of different types of lasers, has allowed for minimally invasive and safe procedures in the treatment of BPH [<xref rid="CIT0004" ref-type="bibr">4</xref>, <xref rid="CIT0005" ref-type="bibr">5</xref>]. Depending on the type of laser, resection or vaporization of the prostatic adenoma tissue is performed. For this purpose, and with various results, there is a number of procedures carried out such as Holmium Laser Prostatectomy (HLP), potassium–titanyl–phosphate laser vaporization (KTP) [<xref rid="CIT0006" ref-type="bibr">6</xref>], or holmium laser ablation of the prostate (HoLAP), and Interstitial laser coagulation (ILC) [<xref rid="CIT0004" ref-type="bibr">4</xref>]. It must be emphasized that effective method of enucleation of prostatic adenoma is Thulium laser enucleation [<xref rid="CIT0007" ref-type="bibr">7</xref>, <xref rid="CIT0008" ref-type="bibr">8</xref>]. Continuous improvement of the devices presently used to perform prostatic adenoma resection, as well as the introduction of increasingly more modern laser devices has, however, not reduced complication rates connected with their use. Among the most troublesome complications of laser treatments are urethrostenosis, bladder neck stenosis and fibrosis of the site of adenoma removal [<xref rid="CIT0005" ref-type="bibr">5</xref>].</p><p>The aim of this study is to compare the changes which take place in the incision line of the prostatic adenoma, made with a monopolar cutting electrode and holmium laser, as well as the evaluation of the mass and volume loss of benign prostatic hyperplasia tissue.</p></sec><sec id="S0002"><title>MATERIAL AND METHOD</title><p>The material used in this study consisted of 74 preparations of prostatic adenoma, with volumes between 62 and 293 ml, the average being 120.7 ml, from 37 patients, aged 58 to 81 years (average 66.8 years), treated by transbladder retropubic adenomectomy using the Harris–Hryntschak method. Tissue material in the form of prostate gland lobes was cut in vitro. One lobe was cut using holmium laser, the other using a monopolar cutting electrode.</p><p>Each lobe was weighed separately, at room conditions, immediately after surgical removal, using an electronic scale, Radwag type XA 110/X number 278499/09, with the expiry date certificate dated on the 30<sup>th</sup> of December 2009. Then, the tissue volume of each adenoma lobe was measured using a measuring cylinder filled with water, with graduations at 10 ml.</p><p>After the measurements were made, each adenoma lobe underwent the following procedures:<list list-type="bullet"><list-item><p>one lobe of the prostate was cut with Collins monopolar cutting electrode ERBE ICC 300 AUTOCAT 155 W; the other with holmium laser HO: YAG Omni PulseMax 80 W, using a 550 nm fiber</p></list-item><list-item><p>after being dried with water absorbing paper, the tissue material was weighed again the tissue volume of the prostatic adenoma was measured.</p></list-item></list></p><p>Both measurements were performed at the same room conditions. After the measurements were made, the mass and volume loss of the prostatic adenoma tissue was evaluated for eachcase, monopolar cutting electrode and holmium laser.</p><p>The material was then placed into two separate containers, each filled with 10% formaldehyde. After being fixed, at room temperature, the adenoma tissue was cut into pieces and dehydrated in concentrated ethanol. Then it was stained with eosin and hematoxylin, and embedded in a paraffin block heated in a thermostat at a temperature of 45 degrees Celsius. A fixed block was sectioned into 4–micrometer pieces. Finally, the prepared material was evaluated under light microscope Olympus BX 43, at 1x40, 1x100 and 1x200 magnifications. In this way, the depth and quality of the changes made with either method was assessed. The depth of thermocoagulation was measured under the microscope using a millimeter grid.</p></sec><sec sec-type="results" id="S0003"><title>RESULTS</title><p>Microscopic examination of specimens taken from 37 patients led to the following histopathological diagnoses:<list list-type="order"><list-item><p>In 25 preparations, benign nodular prostatic hyperplasia.</p></list-item><list-item><p>In 8 preparations, nodular prostatic hyperplasia with a chronic inflammatory infiltration.</p></list-item><list-item><p>In 2 preparations, nodular prostatic hyperplasia with foci of urothelial metaplasia.</p></list-item><list-item><p>In 2 preparations, prostatic adenocarcinoma.</p></list-item></list></p><p>Moreover, thermocoagulation changes, which occurred during the cutting process performed with using the monopolar cutting electrode in one lobe and holmium laser in the other, were observed in the prostatic adenoma tissue. The depth of thermocoagulation changes after the incision of the lobe with holmium laser varied from 0.0 to 3 mm, the average being 1.17 mm. When the incision was made with the monopolar cutting electrode, the depth of thermocoagulation changes was between 0.0 and 0.5 mm, the average being 0.19 mm (<xref ref-type="table" rid="T0001">Table 1</xref>).
</p><table-wrap id="T0001" position="float"><label>Table 1</label><caption><p>The changes observed in the prostatic adenoma tissue as a result of the use of monopolar cutting electrode and holmium laser. The study material obtained via open retropubic adenomectomy using Harris–Hryntchak method. The incision of the material obtained via open surgery was performed in vitro</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">The type of device used to cut prostatic tissue</th><th align="center" rowspan="1" colspan="1">Monopolar cutting electrode</th><th align="center" rowspan="1" colspan="1">Holomium laser beam</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">The depth of thermocoagulation layer</td><td align="center" rowspan="1" colspan="1">0.0–0.5 mm Average 0.19 mm</td><td align="center" rowspan="1" colspan="1">0.0–3 mm Average 1.17 mm</td></tr></tbody></table></table-wrap><p>The measurements of the tissue mass and volume loss of each prostatic adenoma lobe were also made. These were taken before and after the incision of one lobe with the monopolar cutting electrode and the other with the holmium laser. The analysis of this data showed that the volume loss of prostatic adenoma tissue cut with the holmium laser was between 0 and 10 ml, the average being 3.57 ml, whereas the mass loss varied from 0.05 g to 7.8 g, the average being 1.73 g.</p><p>Where the incision was made with the monopolar cutting electrode, tissue volume loss ranged from 0 to 10 ml, the average being 2.48 ml. Tissue mass loss, ranged from 0.04 g to 3.1 g, with an average of 0.807 g. The results obtained are illustrated in <xref ref-type="table" rid="T0002">Table 2</xref>.
</p><table-wrap id="T0002" position="float"><label>Table 2</label><caption><p>The evaluation of the changes in the prostatic tissue mass and volume as a result of the use of monopolar cutting electrode and holmium laser</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">The type of device used to cut prostatic tissue</th><th align="center" rowspan="1" colspan="1">Monopolar Cutting electrode</th><th align="center" rowspan="1" colspan="1">Holmium Laser Beam</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">Tissue mass loss of prostatic adenoma</td><td align="center" rowspan="1" colspan="1">0.04–3.1 g Average 0.807 g</td><td align="center" rowspan="1" colspan="1">0.05–7.8 g Average 1.73 g</td></tr><tr><td align="left" rowspan="1" colspan="1">Tissue volume loss of prostatic adenoma</td><td align="center" rowspan="1" colspan="1">0–10 ml Average 2.48 ml</td><td align="center" rowspan="1" colspan="1">0–10 ml Average 3.57 ml</td></tr></tbody></table></table-wrap><p>In the conducted in vitro examination, the depth of thermal changes after the incision by monopolar cutting electrode was on average 0.19 mm, and by holmium laser 1.17 mm (<xref ref-type="table" rid="T0001">Table 1</xref>). Having assessed the way prostatic adenoma tissue reacted to the use of monopolar cutting electrode and holmium laser during the in vitro procedure, it can be stated that holmium laser beam causes greater thermocoagulation changes in the incision line, greater tissue volume loss and a significantly larger tissue mass loss (<xref ref-type="table" rid="T0002">Table 2</xref>).</p><p>In order to carefully examine the changes taking place in prostatic tissue subjected to the activity of monopolar cutting electrode and holmium laser, all preparations were studied under light microscope (Olympus BX 43), at 40x, 100x and 200x magnifications.</p><p><xref ref-type="fig" rid="F0001">Figure 1</xref> shows a typical picture of normal, undamaged prostatic tissue at 40x magnification. Normal glandular ducts with normal cells and stroma are clearly visible.</p><fig id="F0001" position="float"><label>Figure 1</label><caption><p>Histopathological picture of benign nodular prostatic hyperplasia HE, 1x40.</p></caption><graphic xlink:href="CEJU-67-00351-g001"></graphic></fig><p><xref ref-type="fig" rid="F0002">Figure 2</xref> demonstrates superficial thermocoagulation changes after the use of monopolar cutting electrode. There are glandular ducts with live cells containing vacuoles, large nuclei, ground substance, and a small amount of collagen fibers.</p><fig id="F0002" position="float"><label>Figure 2</label><caption><p>Superficial thermocoagulation changes in prostatic tissue with benign nodular hyperplasia cut with the use of monopolar cutting electrode, HE 1x100.</p></caption><graphic xlink:href="CEJU-67-00351-g002"></graphic></fig><p>As a result of the use of holmium laser, thermocoagulation changes were observed in the incision line of prostatic tissue, both in the glandular epithelium, as well as in the stroma fibroblasts. The shape of the cells was irregular, and most were fragmented. Cytoplasmic organelles were indiscernible. In the stroma, only collagen fibers forming a net were visible. In the gland lumens, damaged basement membranes were observed. Such morphotic features are characteristic of deep thermal tissue damage.</p><p>In the microscopic examination of prostatic tissue, changes concerning the histoarchitecture of the prostatic adenoma cell itself were also observed. Holmium laser caused total damage of cellular organelles, vacuolization of cytoplasm and destruction of cellular nuclei. Only undamaged collagen fibers remained. As a result, holmium laser caused denaturation of cellular proteins and complete cell damage (<xref ref-type="fig" rid="F0003">Figure 3</xref>).</p><fig id="F0003" position="float"><label>Figure 3</label><caption><p>Deep thermocoagulation changes in prostatic tissue with benign nodular hyperplasia cut with the use of holmium laser, intensive destruction of prostatic stroma. HE 1x200.</p></caption><graphic xlink:href="CEJU-67-00351-g003"></graphic></fig><p>Where the cutting electrode was used, cytoarchitecture of the cell itself remained almost unchanged. There were small changes noticed in the cellular nucleus, namely chromatin and cellular nucleolus damage.</p></sec><sec sec-type="discussion" id="S0004"><title>DISCUSSION</title><p>TURP remains the gold standard in the surgical treatment of prostatic gland disease. Despite its many advantages, intrasurgical bleeding and the possibility of damage to the urethral sphincter are still the biggest disadvantages of this method. Other complications, such as TURP syndrome, that is postprostatectomy syndrome, urinary retention, urethrostenosis and urinary bladder hyperactivity, occur sporadically [<xref rid="CIT0008" ref-type="bibr">8</xref>–<xref rid="CIT0010" ref-type="bibr">10</xref>]. The introduction of various types of lasers as a form of treatment of prostatic gland diseases is an attempt to find a method of minimising postoperative complications, including surgical bleeding. Owing to the use of laser energy in treatment, now there is a minimal risk of massive bleeding. The application of holmium laser for the enucleation of the prostate is highly effective [<xref rid="CIT0011" ref-type="bibr">11</xref>–<xref rid="CIT0014" ref-type="bibr">14</xref>]. It must be noted, however, that other complications are possible: fever, urinary retention, perforation of the capsule of the prostate and bladder, as well as well as exceptionally TURP syndrome with hyponatremia, which are included among early complications [<xref rid="CIT0015" ref-type="bibr">15</xref>, <xref rid="CIT0016" ref-type="bibr">16</xref>]. Late complications also occur: for instance, stenosis of the enucleation canal in 2.5% of cases, stenosis of the bulb of the urethra in 2.1%, and bladder neck stenosis in 0.35% [<xref rid="CIT0017" ref-type="bibr">17</xref>–<xref rid="CIT0019" ref-type="bibr">19</xref>]. Enucleation of the prostate with holmium laser can be recognized as an alternative to TURP in the treatment of benign prostatic hyperplasia. Analyzing the benefits of applying holmium laser in endoscopic procedures performed on the prostatic gland, we can see the reduction in urine retention in the bladder after miction by 46–49%, as well as a low complication rate, around 12.6%, in comparison to retropubic adenomectomy, where the complication rate is estimated at 20% [<xref rid="CIT0020" ref-type="bibr">20</xref>–<xref rid="CIT0022" ref-type="bibr">22</xref>]. It can be noted that operative bleeding during procedures performed using laser occurs in less than 1% of cases, while in the case of TURP the occurrence of such bleeding can reach 7% [<xref rid="CIT0023" ref-type="bibr">23</xref>, <xref rid="CIT0024" ref-type="bibr">24</xref>]. These phenomena are mainly related to the depth and scope of the coagulation changes. In case of TURP it is around 1.11 mm. With holmium laser it is 0.4 mm, Potassium – Tytanyl – Phosphate laser 0.8 mm,and Neodymium– YAG laser 3 mm [<xref rid="CIT0024" ref-type="bibr">24</xref>–<xref rid="CIT0026" ref-type="bibr">26</xref>]. Such deep coagulation and penetration causes permanent tissue damage, as well as damage of mucosa, the muscular coat and stroma. There is postoperative scarring, which with time causes postoperative site stenosis. After procedures performed with the HO: Yag laser, dominant symptoms are those related to the irritation of the lower urinary tract. Other problematic complications include: recurrent urinary tract infections (in 35% of cases), postoperative urethrostenosis (2.1%), stenosis of the site of adenoma removal and bladder neck stenosis (2.5%), as well as the need for reoperation because of urinary retention in the first year, (15%), and within 3 years (40% of cases) [<xref rid="CIT0026" ref-type="bibr">26</xref>–<xref rid="CIT0028" ref-type="bibr">28</xref>]. The occurrence of fibrosis, and the resulting bladder neck stenosis, during laser treatment may reach 3.2% of cases, especially during procedures performed on small adenomas. Thus, in order to avoid bladder neck stenosis through fibrosis, a prophylactic incision is made on the bladder neck at 5 and 7 o'clock. This complication does not occur after TURP, probably because a definitely smaller range of thermal energy is emitted and transferred to tissues [<xref rid="CIT0019" ref-type="bibr">19</xref>, <xref rid="CIT0025" ref-type="bibr">25</xref>].</p><p>After procedures performed with the holmium laser, we also observe stenosis of the bulb of the urethra caused by thermal damage [<xref rid="CIT0029" ref-type="bibr">29</xref>]. The authors recommend calibration of the urethra to 30 F for 20 to 30 minutes [<xref rid="CIT0019" ref-type="bibr">19</xref>]. Deep penetration of laser energy and its effect on tissue causes urinary tract irritation, and as a result urinary incontinence from urgency in the initial postoperative period in 44% of patients [<xref rid="CIT0009" ref-type="bibr">9</xref>, <xref rid="CIT0010" ref-type="bibr">10</xref>, <xref rid="CIT0019" ref-type="bibr">19</xref>]. Deep penetration of laser energy causes coagulation of surrounding tissue, thus reducing the incidence of intrasurgical bleeding in the initial postoperative period [<xref rid="CIT0014" ref-type="bibr">14</xref>, <xref rid="CIT0017" ref-type="bibr">17</xref>, <xref rid="CIT0025" ref-type="bibr">25</xref>]. There is a lower incidence of urinary retention due to bladder tamponade caused by blood clots. The authors also draw attention to the irrigation fluid absorption by the patient's during the procedure, and as a result, hyponatremia, which is dangerous to live. In case of the procedures performed using holmium laser the volume of fluid absorbed by blood vessels and tissue is smaller because of the deep thermocoagulation changes [<xref rid="CIT0002" ref-type="bibr">2</xref>, <xref rid="CIT0019" ref-type="bibr">19</xref>].</p><p>The tests we performed confirm the possibility of the occurrence of the complications described above.</p></sec><sec sec-type="conclusions" id="S0005"><title>CONCLUSIONS</title><p>The depth of thermocoagulation changes in prostatic adenoma tissue is similar in the case of the application of holmium laser and monopolar cutting electrode.</p><p>The tissue volume loss of prostatic adenoma is similar in case of the application of holmium laser and monopolar cutting electrode.</p><p>The tissue mass loss is greater in the case of the application of holmium laser than in case of monopolar cutting electrode.</p></sec></body><back><ref-list><title>References</title><ref id="CIT0001"><label>1</label><element-citation 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