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The objective of this study was to specify similarities and inconsistencies between these two biomarkers according to global characteristics of the disease. We conducted a retrospective study in 16 patients suffering from treatment-resistant MDD who underwent, during the same current episode, a cerebral perfusion SPECT with\n                      <jats:sup>99m<\/jats:sup>\n                      Tc-HMPAO and a metabolic PET with\n                      <jats:sup>18<\/jats:sup>\n                      F-FDG. Whole-brain voxel-based SPM(T) maps were generated in correlation with the number of depressive episodes and in correlation with the depression duration, separately for the two exams (p-voxel\u2009&lt;\u20090.001 uncorrected,\n                      <jats:italic>k<\/jats:italic>\n                      \u2009&gt;\u200920).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>No significant correlations were found between brain metabolism and either the number of depressive episodes or the duration of the disease, even at an uncorrected p-voxel\u2009&lt;\u20090.005. On the other hand, the increased number of depressive episodes was correlated with decreased perfusion of the right middle frontal cortex, the right anterior cingulum cortex, the right insula, the right medial temporal cortex and the left precuneus. The increased depression duration was correlated with decreased perfusion of the right anterior cingulum cortex.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This preliminary study demonstrates more significant results with brain perfusion compared with glucose metabolism in treatment-resistant MDD, highlighting the value of brain SPECT despite less favourable instrumentation detection compared to PET.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s13550-020-00713-2","type":"journal-article","created":{"date-parts":[[2020,10,8]],"date-time":"2020-10-08T05:03:36Z","timestamp":1602133416000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Brain SPECT perfusion and PET metabolism as discordant biomarkers in major depressive disorder"],"prefix":"10.1186","volume":"10","author":[{"given":"Maud","family":"Tastevin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laurent","family":"Boyer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theo","family":"Korchia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guillaume","family":"Fond","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Lan\u00e7on","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rapha\u00eblle","family":"Richieri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1912-6132","authenticated-orcid":false,"given":"Eric","family":"Guedj","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,10,8]]},"reference":[{"key":"713_CR1","doi-asserted-by":"publisher","first-page":"e18","DOI":"10.4088\/JCP.8133tx4c","volume":"72","author":"ME Thase","year":"2011","unstructured":"Thase ME. 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