Biodistribution of technetium-99m pertechnetate after Roux-en-Y gastric bypass (Capella technique) in rats

PURPOSE: The biodistribution of sodium pertechnetate, the most used radiopharmaceutical in nuclear medicine, has not been studied in details after bariatric surgery. The objective was to investigate the effect of Roux-en-Y gastric bypass (RYGB) on biodistribution of sodium pertechnetate (Na99mTc-) i...

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Published in:Acta cirúrgica brasileira 2010-02, Vol.25 (1), p.9-12
Main Authors: Rêgo, Amália Cínthia Meneses do, Araújo-Filho, Irami, Azevedo, Ítalo Medeiros, Jácome, Daniel Tôrres, Ramalho, Rachel de Alcântara Oliveira, Medeiros, Aldo Cunha
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creator Rêgo, Amália Cínthia Meneses do
Araújo-Filho, Irami
Azevedo, Ítalo Medeiros
Jácome, Daniel Tôrres
Ramalho, Rachel de Alcântara Oliveira
Medeiros, Aldo Cunha
description PURPOSE: The biodistribution of sodium pertechnetate, the most used radiopharmaceutical in nuclear medicine, has not been studied in details after bariatric surgery. The objective was to investigate the effect of Roux-en-Y gastric bypass (RYGB) on biodistribution of sodium pertechnetate (Na99mTc-) in organs and tissues of rats. METHODS: Twelve rats were randomly divided into two groups of 6 animals each. The RYGB group rats were submitted to the Roux-en-Y gastric bypass and the control group rats were not operated. After 15 days, all rats were injected with 0.1mL of Na99mTc- via orbital plexus with average radioactivity of 0.66 MBq. After 30 minutes, liver, stomach, thyroid, heart, lung, kidney and femur samples were harvested, weighed and percentage of radioactivity per gram (%ATI/g) of each organ was determined by gama counter Wizard Perkin-Elmer. We applied the Student t test for statistical analysis, considering p
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The objective was to investigate the effect of Roux-en-Y gastric bypass (RYGB) on biodistribution of sodium pertechnetate (Na99mTc-) in organs and tissues of rats. METHODS: Twelve rats were randomly divided into two groups of 6 animals each. The RYGB group rats were submitted to the Roux-en-Y gastric bypass and the control group rats were not operated. After 15 days, all rats were injected with 0.1mL of Na99mTc- via orbital plexus with average radioactivity of 0.66 MBq. After 30 minutes, liver, stomach, thyroid, heart, lung, kidney and femur samples were harvested, weighed and percentage of radioactivity per gram (%ATI/g) of each organ was determined by gama counter Wizard Perkin-Elmer. We applied the Student t test for statistical analysis, considering p&lt;0.05 as significant. RESULTS: Significant reduction in mean %ATI/g was observed in the liver, stomach and femur in the RYGB group animals, compared with the control group rats (p&lt;0.05). In other organs no significant difference in %ATI/g was observed between the two groups. CONCLUSION: This work contributes to the knowledge that the bariatric surgery RYGB modifies the pattern of biodistribution of Na99mTc-. OBJETIVO: Avaliar o efeito da cirurgia de desvio gástrico em Y de Roux (BGYR) na biodistribuição do pertecnetato de sódio (Na99mTc) em órgãos e tecidos de ratos. MÉTODOS: Doze ratos Wistar foram aleatoriamente distribuidos em dois grupos de seis animais cada. O grupo BGYR foi submetido a técnica cirúrgica do desvio gástrico em Y de Roux e o grupo controle não foi operado. No 15º dia de pós-operatório foi administrado 0,1 ml IV de Na99mTc aos animais dos dois grupos, com atividade radioativa média de 0,66MBq. Após 30 minutos os ratos foram mortos e retirados fragmentos de fígado, estômago, tireóide, coração, pulmão, rim e fêmur. As amostras foram lavadas com solução salina 0,9% pesadas e submetidas ao Contador Gama 1470, WizardTM Perkin-Elmer para se determinar o percentual de atividade radiotiva por grama (%ATI/g) de cada órgão. Empregou-se o teste t de Student para análise estatística, considerando p&lt;0,05 como significante. RESULTADOS: Redução significante na média de %ATI/g foi observada no fígado, estômago e fêmur nos animais submetidos a cirurgia de BGYR comparado com o grupo controle (p&lt;0,05). Nos demais órgãos não houve diferença significante no %ATI/g entre os dois grupos. 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The objective was to investigate the effect of Roux-en-Y gastric bypass (RYGB) on biodistribution of sodium pertechnetate (Na99mTc-) in organs and tissues of rats. METHODS: Twelve rats were randomly divided into two groups of 6 animals each. The RYGB group rats were submitted to the Roux-en-Y gastric bypass and the control group rats were not operated. After 15 days, all rats were injected with 0.1mL of Na99mTc- via orbital plexus with average radioactivity of 0.66 MBq. After 30 minutes, liver, stomach, thyroid, heart, lung, kidney and femur samples were harvested, weighed and percentage of radioactivity per gram (%ATI/g) of each organ was determined by gama counter Wizard Perkin-Elmer. We applied the Student t test for statistical analysis, considering p&lt;0.05 as significant. RESULTS: Significant reduction in mean %ATI/g was observed in the liver, stomach and femur in the RYGB group animals, compared with the control group rats (p&lt;0.05). In other organs no significant difference in %ATI/g was observed between the two groups. CONCLUSION: This work contributes to the knowledge that the bariatric surgery RYGB modifies the pattern of biodistribution of Na99mTc-. OBJETIVO: Avaliar o efeito da cirurgia de desvio gástrico em Y de Roux (BGYR) na biodistribuição do pertecnetato de sódio (Na99mTc) em órgãos e tecidos de ratos. MÉTODOS: Doze ratos Wistar foram aleatoriamente distribuidos em dois grupos de seis animais cada. O grupo BGYR foi submetido a técnica cirúrgica do desvio gástrico em Y de Roux e o grupo controle não foi operado. No 15º dia de pós-operatório foi administrado 0,1 ml IV de Na99mTc aos animais dos dois grupos, com atividade radioativa média de 0,66MBq. Após 30 minutos os ratos foram mortos e retirados fragmentos de fígado, estômago, tireóide, coração, pulmão, rim e fêmur. As amostras foram lavadas com solução salina 0,9% pesadas e submetidas ao Contador Gama 1470, WizardTM Perkin-Elmer para se determinar o percentual de atividade radiotiva por grama (%ATI/g) de cada órgão. Empregou-se o teste t de Student para análise estatística, considerando p&lt;0,05 como significante. RESULTADOS: Redução significante na média de %ATI/g foi observada no fígado, estômago e fêmur nos animais submetidos a cirurgia de BGYR comparado com o grupo controle (p&lt;0,05). Nos demais órgãos não houve diferença significante no %ATI/g entre os dois grupos. 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The objective was to investigate the effect of Roux-en-Y gastric bypass (RYGB) on biodistribution of sodium pertechnetate (Na99mTc-) in organs and tissues of rats. METHODS: Twelve rats were randomly divided into two groups of 6 animals each. The RYGB group rats were submitted to the Roux-en-Y gastric bypass and the control group rats were not operated. After 15 days, all rats were injected with 0.1mL of Na99mTc- via orbital plexus with average radioactivity of 0.66 MBq. After 30 minutes, liver, stomach, thyroid, heart, lung, kidney and femur samples were harvested, weighed and percentage of radioactivity per gram (%ATI/g) of each organ was determined by gama counter Wizard Perkin-Elmer. We applied the Student t test for statistical analysis, considering p&lt;0.05 as significant. RESULTS: Significant reduction in mean %ATI/g was observed in the liver, stomach and femur in the RYGB group animals, compared with the control group rats (p&lt;0.05). In other organs no significant difference in %ATI/g was observed between the two groups. CONCLUSION: This work contributes to the knowledge that the bariatric surgery RYGB modifies the pattern of biodistribution of Na99mTc-. OBJETIVO: Avaliar o efeito da cirurgia de desvio gástrico em Y de Roux (BGYR) na biodistribuição do pertecnetato de sódio (Na99mTc) em órgãos e tecidos de ratos. MÉTODOS: Doze ratos Wistar foram aleatoriamente distribuidos em dois grupos de seis animais cada. O grupo BGYR foi submetido a técnica cirúrgica do desvio gástrico em Y de Roux e o grupo controle não foi operado. No 15º dia de pós-operatório foi administrado 0,1 ml IV de Na99mTc aos animais dos dois grupos, com atividade radioativa média de 0,66MBq. Após 30 minutos os ratos foram mortos e retirados fragmentos de fígado, estômago, tireóide, coração, pulmão, rim e fêmur. As amostras foram lavadas com solução salina 0,9% pesadas e submetidas ao Contador Gama 1470, WizardTM Perkin-Elmer para se determinar o percentual de atividade radiotiva por grama (%ATI/g) de cada órgão. Empregou-se o teste t de Student para análise estatística, considerando p&lt;0,05 como significante. RESULTADOS: Redução significante na média de %ATI/g foi observada no fígado, estômago e fêmur nos animais submetidos a cirurgia de BGYR comparado com o grupo controle (p&lt;0,05). Nos demais órgãos não houve diferença significante no %ATI/g entre os dois grupos. CONCLUSÃO: A cirurgia BGYR em ratos modificou a biodistribuição do Na99mTc em alguns órgãos, podendo ter implicações clínicas na interpretação de exames cintilográficos.</abstract><doi>10.1590/S0102-86502010000100004</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record>
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title Biodistribution of technetium-99m pertechnetate after Roux-en-Y gastric bypass (Capella technique) in rats
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