{"id":1945,"date":"2023-01-18T14:05:07","date_gmt":"2023-01-18T17:05:07","guid":{"rendered":"https:\/\/pressreleases.scielo.org\/en\/?p=1945"},"modified":"2023-03-28T13:05:50","modified_gmt":"2023-03-28T16:05:50","slug":"optical-instrument-helps-monitor-survival-rate-of-patients-undergoing-liver-transplant","status":"publish","type":"post","link":"https:\/\/pressreleases.scielo.org\/en\/2023\/01\/18\/optical-instrument-helps-monitor-survival-rate-of-patients-undergoing-liver-transplant\/","title":{"rendered":"Optical instrument helps monitor survival rate of patients undergoing liver transplant"},"content":{"rendered":"

Rosa Emilia Moraes, scientific journalist at Linceu Editorial, S\u00e3o Jos\u00e9 dos Campos, SP, Brasil.<\/strong><\/p>\n

\"Logo<\/a>The metabolic stress caused by blood reperfusion is a delicate factor that can lead to the failure of the entire transplant procedure. Risks in the initial perfusion can also irreversibly compromise the organ or graft, causing irreparable damage that results in the patient’s death. Fluorescence spectroscopy under violet light excitation (408 nm) appears to be a viable method for real-time monitoring of the molecular aspect of graft conditions (PANJEHPOUR, et al<\/em>, 2002).<\/p>\n

With the aim of demonstrating the validity of the technique as an adjunct in the indication of an organ or graft viability for transplantation, also considering the conditions presented in the case of a procedure with cold perfusion, the article Fluorescence spectroscopy for clinical transplantation liver grafts monitoring: possibilities offered by 408 nm excitation<\/a> published in Acta Cir\u00fargica Brasileira<\/em> (vol. 37, no. 9) shows the results of research carried out with two major centers of scientific production in Brazil linked to the University of S\u00e3o Paulo (Universidade de S\u00e3o Paulo \/USP<\/em>).<\/p>\n

\"Two<\/a>

Image: article.<\/em><\/p><\/div>\n

Figure 1. Comparison between fluorescence spectra at 532 and 408 nm excitation, with examples of spectra obtained for patient P01. (a) Note the only the band centered around 600 nm is observed for both spectra, whereas 408 nm excitation provides other spectral regions to be analyzed; normalized spectra, indicating the peak absorption wavelengths observed for different stages: endogenous fluorescence (AF) and back-table (BT) stages prior to organ graft implantation, and 60 min after anastomoses finalization (WR60); (b) The main decrease in fluorescence when compared to AF was about 556 nm (green spectral region with intense light absorption by blood constituents).<\/strong><\/p>\n

The transplant procedures were performed at the Special Liver Transplant Unit (Unidade Especial de Transplante de F\u00edgado\/UETF<\/em>), at the General Clinics Hospital of the Faculty of Medicine of Ribeir\u00e3o Preto (Hospital das Cl\u00ednicas da Faculdade de Medicina de Ribeir\u00e3o Preto\/HC-FMRP-USP<\/em>), and data analysis was carried out at the Biophotonics Laboratory of the Department of Physics and Materials Science of the S\u00e3o Carlos Institute of Physics (IFSC\/USP), funded by the Optics and Photonics Research Center \u2013 CEPOF (CePID program\/FAPESP) and the INCT of Basic Optics and Applied to Life Sciences (CNPq\/FAPESP).<\/p>\n

Data collection covered 15 grafts provided exclusively from deceased donors after official and reported brain death following current protocols. The grafts were monitored before and during the transplant stages involving cold perfusion.<\/p>\n

\"Close-up<\/a>

Image: Authors’ personal file.<\/em><\/p><\/div>\n

Different forms of analysis were carried out to identify patterns that would allow the establishment of a risk classification based on a set of alterations observed in the grafts, which could indicate a higher or lower survival rate for patients in the first 30 days after transplant surgery.<\/p>\n

The wide variety of responses observed within the limits of the elaborated work did not allow a paradigm to be established, but it demonstrates the potential that the technique presents to enable an instrument that allows the prediction of potential complications immediately after transplantation, such as irreversible post-ischemia damage, risks to metabolic homeostasis, and death. In this way, the authors of this study propose that more research be produced on the subject.<\/p>\n

References<\/h3>\n

PANJEHPOUR, M., et al<\/em>. Laser-induced fluorescence spectroscopy for in vivo diagnosis of non-melanoma skin cancers. Lasers Surg Med<\/em> [online]. 2002, vol. 31, no. 5, pp. 367-373 [viewed 18 January 2023]. https:\/\/doi.org\/10.1002\/lsm.10125<\/a>. Available from: https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/lsm.10125<\/a><\/p>\n

To read the article, access<\/h3>\n

VOLLET-FILHO, J.D., et al<\/em>. Fluorescence spectroscopy for clinical transplantation liver grafts monitoring: possibilities offered by 408 nm excitation. Acta Bras Cir<\/em> [online]. 2022, vol. 37, no. 9, e370905 [viewed 18 January 2023]. https:\/\/doi.org\/10.1590\/acb370905<\/a>. Available from: https:\/\/www.scielo.br\/j\/acb\/a\/Jjtnt9hh8Ny5fDrjJwkbtXc\/<\/a><\/p>\n

External links<\/h3>\n

Acta Cir\u00fargica Brasileira \u2013 ACB: https:\/\/www.scielo.br\/acb\/<\/a><\/u><\/p>\n

Unidade Especial de Transplante de F\u00edgado (UETF) do Hospital das Cl\u00ednicas da Faculdade de Medicina de Ribeir\u00e3o Preto da Universidade de S\u00e3o Paulo\u00a0 (HC-FMRP-USP): https:\/\/cirurgiadigestiva.fmrp.usp.br\/setores\/unidade-especial-de-transplante-de-figado\/<\/a><\/p>\n

Hospital das Cl\u00ednicas da Faculdade de Medicina de Ribeir\u00e3o Preto: https:\/\/site.hcrp.usp.br\/<\/a><\/p>\n

Departamento de F\u00edsica e Ci\u00eancia dos Materiais do Instituto de F\u00edsica de S\u00e3o Carlos da Universidade de S\u00e3o Paulo: https:\/\/www2.ifsc.usp.br\/portal-ifsc\/fisica-e-ciencia-dos-materiais-fcm\/<\/a><\/p>\n

Centro de Pesquisas em \u00d3ptica e Fot\u00f4nica \u2013 CEPOF (programa CePID\/FAPESP) \/ INCT de \u00d3ptica B\u00e1sica e Aplicada \u00e0s Ci\u00eancias da Vida (CNPq\/FAPESP): https:\/\/www.ifsc.usp.br\/cepof\/<\/a><\/p>\n

Redes sociais da Acta Cir\u00fargica Brasileira: Facebook<\/a> | Twitter<\/a> | Instagram<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Fluorescence spectroscopy under violet light is a minimally invasive optical technique in liver transplant procedures. It demonstrated effectiveness as a complementary tool for monitoring liver grafts in cold perfusion, providing objective information to support the surgeons’ final decision regarding the use of organs for transplantation. …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":606,"featured_media":1948,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[171,8,12],"tags":[172,191],"class_list":["post-1945","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-acb","category-health-sciences","category-press-releases","tag-acta-cirurgica-brasileira","tag-medicine"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/1945","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/users\/606"}],"replies":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/comments?post=1945"}],"version-history":[{"count":5,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/1945\/revisions"}],"predecessor-version":[{"id":1988,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/posts\/1945\/revisions\/1988"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/media\/1948"}],"wp:attachment":[{"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/media?parent=1945"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/categories?post=1945"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pressreleases.scielo.org\/en\/wp-json\/wp\/v2\/tags?post=1945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}