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Heat dissipation after nonanatomical lung resection using a laser is mainly due to emission to the environment: an experimental ex vivo study

Identifieur interne : 000196 ( Pmc/Checkpoint ); précédent : 000195; suivant : 000197

Heat dissipation after nonanatomical lung resection using a laser is mainly due to emission to the environment: an experimental ex vivo study

Auteurs : A. Kirschbaum [Allemagne] ; M. Ocker [Allemagne] ; D. K. Bartsch [Allemagne] ; K. Quint [Allemagne]

Source :

RBID : PMC:4031427

Abstract

Laser-directed resection of lung metastases is performed more frequently in recent years. The energy-loaded laser rays heat up the lung tissue, considerably. It is still unclear which mechanism is more important for tissue heat dissipation: the lung perfusion or the tissue emission. Therefore, we created a special experimental model to investigate the spontaneous heat dissipation after nonanatomical lung resection using a diode-pumped laser with a high output power. Experiments were conducted on paracardiac pig lung lobes (n = 12) freshly dissected at the slaughterhouse. Nonanatomical resection of lung parenchyma was performed without lobe perfusion in group 1 (n = 6), while group 2 (n = 6) was perfused at a physiological pressure of 25 cm H2O at 37 °C with saline via the pulmonary artery. For this, we used a diode-pumped neodymium-doped yttrium aluminum garnet (Nd:YAG) LIMAX® 120 laser (Gebrüder Martin GmbH & Co. KG, Tuttlingen, Germany) with a wavelength of 1,318 nm and a power output of 100 W. Immediately after completing laser resection, the lungs were monitored with an infrared camera (Type IC 120LV; Trotec, Heinsberg, Germany) while allowed to cool down. The resection surface temperature was taken at 10-s intervals and documented in a freeze-frame until a temperature of 37 °C had been reached. The temperature drop per time unit was analyzed in both groups. Immediately after laser resection, the temperature at the lung surface was 84.33 ± 8.08 °C in group 1 and 76.75 ± 5.33 °C in group 2 (p = 0.29). Group 1 attained the final temperature of 37 °C after 182.95 ± 53.76 s, and group 2 after 121.70 ± 16.02 s (p = 0.01). The temperature drop occurred exponentially in both groups. We calculated both groups’ decays using nonlinear regression, which revealed nearly identical courses. The mean time of tissue temperature of >42 °C, as a surrogate marker for tissue damage, was 97.14 ± 26.90 s in group 1 and 65.00 ± 13.78 s in group 2 (p = 0.02). Heat emission to the environment surpasses heat reduction via perfusion in nonanatomically laser-resected lung lobes. In developing a cooling strategy, a topical cooling method would be promising.


Url:
DOI: 10.1007/s10103-013-1460-9
PubMed: 24146236
PubMed Central: 4031427


Affiliations:


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PMC:4031427

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<p>Laser-directed resection of lung metastases is performed more frequently in recent years. The energy-loaded laser rays heat up the lung tissue, considerably. It is still unclear which mechanism is more important for tissue heat dissipation: the lung perfusion or the tissue emission. Therefore, we created a special experimental model to investigate the spontaneous heat dissipation after nonanatomical lung resection using a diode-pumped laser with a high output power. Experiments were conducted on paracardiac pig lung lobes (
<italic>n</italic>
 = 12) freshly dissected at the slaughterhouse. Nonanatomical resection of lung parenchyma was performed without lobe perfusion in group 1 (
<italic>n</italic>
 = 6), while group 2 (
<italic>n</italic>
 = 6) was perfused at a physiological pressure of 25 cm H
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O at 37 °C with saline via the pulmonary artery. For this, we used a diode-pumped neodymium-doped yttrium aluminum garnet (Nd:YAG) LIMAX® 120 laser (Gebrüder Martin GmbH & Co. KG, Tuttlingen, Germany) with a wavelength of 1,318 nm and a power output of 100 W. Immediately after completing laser resection, the lungs were monitored with an infrared camera (Type IC 120LV; Trotec, Heinsberg, Germany) while allowed to cool down. The resection surface temperature was taken at 10-s intervals and documented in a freeze-frame until a temperature of 37 °C had been reached. The temperature drop per time unit was analyzed in both groups. Immediately after laser resection, the temperature at the lung surface was 84.33 ± 8.08 °C in group 1 and 76.75 ± 5.33 °C in group 2 (
<italic>p</italic>
 = 0.29). Group 1 attained the final temperature of 37 °C after 182.95 ± 53.76 s, and group 2 after 121.70 ± 16.02 s (
<italic>p</italic>
 = 0.01). The temperature drop occurred exponentially in both groups. We calculated both groups’ decays using nonlinear regression, which revealed nearly identical courses. The mean time of tissue temperature of >42 °C, as a surrogate marker for tissue damage, was 97.14 ± 26.90 s in group 1 and 65.00 ± 13.78 s in group 2 (
<italic>p</italic>
 = 0.02). Heat emission to the environment surpasses heat reduction via perfusion in nonanatomically laser-resected lung lobes. In developing a cooling strategy, a topical cooling method would be promising.</p>
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<journal-id journal-id-type="nlm-ta">Lasers Med Sci</journal-id>
<journal-id journal-id-type="iso-abbrev">Lasers Med Sci</journal-id>
<journal-title-group>
<journal-title>Lasers in Medical Science</journal-title>
</journal-title-group>
<issn pub-type="ppub">0268-8921</issn>
<issn pub-type="epub">1435-604X</issn>
<publisher>
<publisher-name>Springer London</publisher-name>
<publisher-loc>London</publisher-loc>
</publisher>
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<article-id pub-id-type="pmc">4031427</article-id>
<article-id pub-id-type="publisher-id">1460</article-id>
<article-id pub-id-type="doi">10.1007/s10103-013-1460-9</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Original Article</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Heat dissipation after nonanatomical lung resection using a laser is mainly due to emission to the environment: an experimental ex vivo study</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Kirschbaum</surname>
<given-names>A.</given-names>
</name>
<address>
<phone>+49-6421-5861738</phone>
<fax>+49-6421-5866593</fax>
<email>akirschb@med.uni-marburg.de</email>
</address>
<xref ref-type="aff" rid="Aff1"></xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Ocker</surname>
<given-names>M.</given-names>
</name>
<xref ref-type="aff" rid="Aff2"></xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Bartsch</surname>
<given-names>D. K.</given-names>
</name>
<xref ref-type="aff" rid="Aff1"></xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Quint</surname>
<given-names>K.</given-names>
</name>
<xref ref-type="aff" rid="Aff2"></xref>
<xref ref-type="aff" rid="Aff3"></xref>
</contrib>
<aff id="Aff1">
<label></label>
Department of Visceral, Thoracic and Vascular Surgery, University Hospital Giessen and Marburg GmbH, Baldingerstrasse, 35033 Marburg, Germany</aff>
<aff id="Aff2">
<label></label>
Institute for Surgical Research, Philipps University of Marburg, Marburg, Germany</aff>
<aff id="Aff3">
<label></label>
Institute of Pathology, University Hospital of Erlangen, Erlangen, Germany</aff>
</contrib-group>
<pub-date pub-type="epub">
<day>22</day>
<month>10</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="pmc-release">
<day>22</day>
<month>10</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="ppub">
<year>2014</year>
</pub-date>
<volume>29</volume>
<issue>3</issue>
<fpage>1037</fpage>
<lpage>1042</lpage>
<history>
<date date-type="received">
<day>6</day>
<month>6</month>
<year>2013</year>
</date>
<date date-type="accepted">
<day>2</day>
<month>10</month>
<year>2013</year>
</date>
</history>
<permissions>
<copyright-statement>© The Author(s) 2013</copyright-statement>
<license license-type="OpenAccess">
<license-p>
<bold>Open Access</bold>
This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.</license-p>
</license>
</permissions>
<abstract id="Abs1">
<p>Laser-directed resection of lung metastases is performed more frequently in recent years. The energy-loaded laser rays heat up the lung tissue, considerably. It is still unclear which mechanism is more important for tissue heat dissipation: the lung perfusion or the tissue emission. Therefore, we created a special experimental model to investigate the spontaneous heat dissipation after nonanatomical lung resection using a diode-pumped laser with a high output power. Experiments were conducted on paracardiac pig lung lobes (
<italic>n</italic>
 = 12) freshly dissected at the slaughterhouse. Nonanatomical resection of lung parenchyma was performed without lobe perfusion in group 1 (
<italic>n</italic>
 = 6), while group 2 (
<italic>n</italic>
 = 6) was perfused at a physiological pressure of 25 cm H
<sub>2</sub>
O at 37 °C with saline via the pulmonary artery. For this, we used a diode-pumped neodymium-doped yttrium aluminum garnet (Nd:YAG) LIMAX® 120 laser (Gebrüder Martin GmbH & Co. KG, Tuttlingen, Germany) with a wavelength of 1,318 nm and a power output of 100 W. Immediately after completing laser resection, the lungs were monitored with an infrared camera (Type IC 120LV; Trotec, Heinsberg, Germany) while allowed to cool down. The resection surface temperature was taken at 10-s intervals and documented in a freeze-frame until a temperature of 37 °C had been reached. The temperature drop per time unit was analyzed in both groups. Immediately after laser resection, the temperature at the lung surface was 84.33 ± 8.08 °C in group 1 and 76.75 ± 5.33 °C in group 2 (
<italic>p</italic>
 = 0.29). Group 1 attained the final temperature of 37 °C after 182.95 ± 53.76 s, and group 2 after 121.70 ± 16.02 s (
<italic>p</italic>
 = 0.01). The temperature drop occurred exponentially in both groups. We calculated both groups’ decays using nonlinear regression, which revealed nearly identical courses. The mean time of tissue temperature of >42 °C, as a surrogate marker for tissue damage, was 97.14 ± 26.90 s in group 1 and 65.00 ± 13.78 s in group 2 (
<italic>p</italic>
 = 0.02). Heat emission to the environment surpasses heat reduction via perfusion in nonanatomically laser-resected lung lobes. In developing a cooling strategy, a topical cooling method would be promising.</p>
</abstract>
<kwd-group xml:lang="en">
<title>Keywords</title>
<kwd>Heat dissipation</kwd>
<kwd>Nonanatomical lung resection</kwd>
<kwd>Lung perfusion</kwd>
<kwd>Thermal lung damage</kwd>
<kwd>Laser surgery</kwd>
</kwd-group>
<custom-meta-group>
<custom-meta>
<meta-name>issue-copyright-statement</meta-name>
<meta-value>© Springer-Verlag London 2014</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
</pmc>
<affiliations>
<list>
<country>
<li>Allemagne</li>
</country>
<region>
<li>Bavière</li>
<li>District de Giessen</li>
<li>District de Moyenne-Franconie</li>
<li>Hesse (Land)</li>
</region>
<settlement>
<li>Erlangen</li>
<li>Marbourg</li>
</settlement>
</list>
<tree>
<country name="Allemagne">
<region name="Hesse (Land)">
<name sortKey="Kirschbaum, A" sort="Kirschbaum, A" uniqKey="Kirschbaum A" first="A." last="Kirschbaum">A. Kirschbaum</name>
</region>
<name sortKey="Bartsch, D K" sort="Bartsch, D K" uniqKey="Bartsch D" first="D. K." last="Bartsch">D. K. Bartsch</name>
<name sortKey="Ocker, M" sort="Ocker, M" uniqKey="Ocker M" first="M." last="Ocker">M. Ocker</name>
<name sortKey="Quint, K" sort="Quint, K" uniqKey="Quint K" first="K." last="Quint">K. Quint</name>
<name sortKey="Quint, K" sort="Quint, K" uniqKey="Quint K" first="K." last="Quint">K. Quint</name>
</country>
</tree>
</affiliations>
</record>

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