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<p class="tableOfContents"><strong>Table of Contents: <a href="/pubs/techbull/nd17/nd17_issue_cover.html">2017 NOVEMBER&#8211;DECEMBER No. 419</a></strong></p>
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<h1 class="articleH1">What's New for 2018 MeSH</h1>
<p class="tbyearmonth">What's New for 2018 MeSH. NLM Tech Bull. 2017 Nov-Dec;(419):e8.</p>
<div class="articleactions">2017 November 30 <span class="status">[posted]</span>
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<img src="/pubs/techbull/mj07/graphics/blutri.gif" alt="dot" height="10" width="10"/>What's New for 2018 MeSH<br /><br />
&#8226; <a href="/pubs/techbull/nd17/nd17_mesh_available.html">2018 MeSH Available for Download</a><br /><br />
&#8226; <a href="/pubs/techbull/nd17/nd17_cataloging_news_2018.html">Cataloging and Metadata News&mdash;2018</a><br /><br />
&#8226; <a href="https://www.nlm.nih.gov/pubs/techbull/nd17/brief/nd17_new_system.html">Newly Maintained MEDLINE for 2018 MeSH Now Available in PubMed</a><br /><br />
&#8226; <a href="/pubs/techbull/nd17/nd17_medline_data_changes_2018.html">MEDLINE Data Changes&mdash;2018</a><br /><br />
&#8226; <a href="/pubs/techbull/so17/so17_2018_mesh_browser.html">2018 MeSH Headings Available in the MeSH Browser</a><br /><br />
&#8226; <a href="/pubs/techbull/so17/so17_yep.html">MEDLINE/PubMed Year-End Processing Activities for 2018</a><br /><br />
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<p><a href="https://web.archive.org/web/20180104181924/https://www.nlm.nih.gov/pubs/factsheets/mesh.html">MeSH</a> is the National Library of Medicine (NLM) controlled vocabulary thesaurus that is updated annually. NLM uses the MeSH thesaurus to index articles from thousands of biomedical journals for the MEDLINE/PubMed database and for the cataloging of books, documents, and audiovisuals acquired by the library.</p>
<h2>Overview of Vocabulary Development and Changes for 2018 MeSH</h2>
<ul>
<li>474 Descriptors added</li>
<li>106 <a href="https://www.nlm.nih.gov/pubs/techbull/nd17/nd17_mesh_headings_replaced.html">Descriptor terms replaced with more up-to-date terminology</a></li>
<li>7 <a href="https://www.nlm.nih.gov/pubs/techbull/nd17/nd17_mesh_headings_replaced.html">Descriptors deleted</a></li>
<li>1 Qualifier (Subheading) deleted</li>
</ul>
<h2>Totals by Type of Terminology</h2>
<ul>
<li> 28,939 MeSH Descriptors</li>
<li>79 Qualifiers</li>
<li>116,909 Total Descriptor Terms</li>
<li>244,154 Supplementary Concept Records</li>
</ul>
<h2>Changes of Note for 2018</h2>
<p>The following changes are detailed in <a href="https://www.nlm.nih.gov/pubs/techbull/nd17/nd17_medline_data_changes_2018.html"><em>MEDLINE Data Changes—2018</em></a>.</p>
<br />
<ol>
<li>
The <a href="https://www.nlm.nih.gov/pubs/techbull/nd17/nd17_medline_data_changes_2018.html#subhead_changes">MeSH qualifier</a> (subheading) /contraindications was deleted.<br /><br /></li>
<li>Three new
<a href="https://www.nlm.nih.gov/pubs/techbull/nd17/nd17_medline_data_changes_2018.html#pub_types">Publication Types </a> are available for 2018:
<ul>
<li>Adaptive Clinical Trial</li>
<li>Equivalence Trial<br /><br />
Note three new related MeSH headings:<br />
<ul>
<li>Adaptive Clinical Trials as Topic</li>
<li>Equivalence Trials as Topic</li>
<li>Proof of Concept</li>
</ul>
<li>Expression of Concern <br /><br /></li>
</ul>
</li>
<li>
Expanded and updated <a href="https://www.nlm.nih.gov/pubs/techbull/nd17/nd17_medline_data_changes_2018.html#terminologies">terminology areas</a>:<br />
<ul>
<li>Isotopes and Radioisotopes</li>
<li>Smoking </li>
<li>Sugars </li>
<li>Virus terminology and new Supplementary Concept Record (SCR) class for <a href="https://www.nlm.nih.gov/pubs/techbull/nd17/nd17_medline_data_changes_2018.html#organisms">Organisms</a></li>
</ul>
</li>
</ol>
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