Ischemic postconditioning assessment in the liver of rats undergoing mesenteric ischemia and reperfusion

Abstract Introduction: Ischemic postconditioning is a method that shows evidence of efficacy in minimizing reperfusion injury; however, its effectiveness in preventing injuries in distant organs is still unknown, especially in those who have undergone mesenteric ischemia and reperfusion. Objective: To evaluate the effect of ischemic postconditioning in preventing reperfusion injury in the liver of rats submitted to mesenteric ischemia and reperfusion, comparing two different methods of ischemic postconditioning. Methods: 30 Wistar male rats were used, distributed into three groups: Group A: Ten rats submitted to intestinal ischemia for 30 minutes followed by reperfusion for 60 minutes; Group B: Ten rats subjected to ischemia and reperfusion; after ischemia, two cycles of reperfusion (two minutes each) interleaved with two cycles of ischemia (two minutes each); and Group C: Ten rats subjected to ischemia and reperfusion; after ischemia, four cycles of reperfusion (30 seconds each) interspersed with four cycles of ischemia (30 seconds each). After the experiment, the left lobe of the liver was resected for subsequent histological analysis, using the following classification: grade 1 - centrilobular congestion; grade 2 - centrilobular congestion with some degeneration of hepatocytes in one or two central veins; and grade 3 - multifocal centrilobular congestion and degeneration of portal hepatocytes. Results: The mean degree of liver damage found was 1.8 in group A, 1.7 in group B and 1.3 in group C. There was no statistically significant difference between the groups. Conclusion: Ischemic postconditioning was unable to minimize reperfusion injury in rats undergoing mesenteric ischemia and reperfusion.

Importance of duration and number of ischemic postconditioning cycles in preventing reperfusion mesenteric injuries. Experimental study in rats

PURPOSE:To evaluate the effect of ischemic postconditioning(IPC) on intestinal mucosa of rats subjected to ischemia and reperfusion process comparing two cycles of reperfusion and ischemia lasting two minutes each and four cycles of reperfusion and ischemia lasting 30 seconds eachMETHODS: Thirty Wistar rats were distributed into three groups: group A (10 rats), ischemia (30 minutes) and reperfusion (60 minutes); group B (10 rats), ischemia and reperfusion plus IPC by two lasting two minutes each; and Group C (10 rats), ischemia and reperfusion plus IPC by four cycles lasting 30 seconds each. Finally, a segment of small intestine was resected for histological analysis. We analysed the results according to Chiu et al. classification and proceeded to the statistical treatment by Kruskal-Wallis test (p<0.05).RESULTS: The mean degree of tissue injury according to Chiu et al. classification were: Group A, 2.77; in group B, 1.4; and group C, 1.4. B X C (p<0.05).CONCLUSIONS: Ischemic postconditioning was able to minimize reperfusion injury of rats undergone mesenteric ischemia and reperfusion process. There was no difference in the effectiveness of the method comparing two cycles of two minutes with four cycles of 30 seconds by H&E histological evaluation of the ileum after 60-minute reperfusion.

Evaluation of Pulmonary Reperfusion Injury in Rats Undergoing Mesenteric Ischemia and Reperfusion and Protective Effect of Postconditioning on this Process

ABSTRACT INTRODUCTION: Some publications have demonstrated the presence of lung reperfusion injury in mesenteric ischemia and reperfusion (I/R), but under to diverse methods. Postconditioning has been recognized as effective in preventing reperfusion injury in various organs and tissues. However, its effectiveness has not been evaluated in the prevention of lung reperfusion injury after mesenteric ischemia and reperfusion. OBJECTIVE: To evaluate the presence of pulmonary reperfusion injury and the protective effect of ischemic postconditioning on lung parenchyma in rats submitted to mesenteric ischemia and reperfusion. METHODS: Thirty Wistar rats were distributed into three groups: group A (10 rats), which was held mesenteric ischemia (30 minutes) and reperfusion (60 minutes); group B (10 rats), ischemia and reperfusion, interspersed by postconditioning with two alternating cycles of reperfusion and reocclusion, for two minutes each; and group C (10 rats), ischemia and reperfusion interleaved by postconditioning with four alternating cycles of reperfusion and reocclusion of 30 seconds each. Finally, it was resected the upper lung lobe for histological analysis. RESULTS: There were mild lung lesions (grade 1) in all samples. There was no statistical difference between groups 1 and 2 (P >0.05). CONCLUSION: The mesenteric ischemia and reperfusion in rats for thirty and sixty minutes, respectively, caused mild reperfusion injury in lung. Postconditioning was not able to minimize the remote reperfusion injury and there was no difference comparing two cycles of two minutes with four cycles of 30 seconds.

Amputação primária no trauma: perfil de um hospital da região centro-oeste do Brasil / Primary amputation in trauma: a profile of hospital Center-west region of Brazil

CONTEXTO: Vivemos num período de epidemia do trauma. A amputação de indicação traumática incide em uma população jovem e economicamente ativa com repercussão onerosa no âmbito socioeconômico, tornando-se um problema de saúde pública. OBJETIVOS: Conhecer a casuística de amputações traumáticas realizadas na Santa Casa de Campo Grande-MS, entre 2005 e 2008. MÉTODOS: Estudo de prevalência, descritivo, longitudinal e retrospectivo. Amostragem de conveniência, realizada com revisão sistemática de prontuários de pacientes submetidos a amputações de membros inferiores e/ou superiores cuja indicação foi trauma incompatível com reconstrução. Foram excluídos os pacientes que já chegaram amputados no pronto-socorro. Avaliaram-se nível de amputação, faixa etária, sexo e escala do sistema MESS para indicação de amputação traumática. Utilizaram-se o teste quiquadrado e o teste exato de Fisher, considerando um intervalo de confiança de 95%. RESULTADOS: Foram realizadas 108 amputações no período, na faixa etária de dois anos a 78 anos, com média de 36,7 ± 12 anos e mediana de 35 anos. Houve predomínio do sexo masculino em 72% da casuística. O nível de amputação mais executado foi de amputações menores (pododáctilos e quirodáctilos). A causa mais frequente foi lesão decorrente de acidente de trânsito. CONCLUSÕES: As amputações traumáticas atingiram uma população jovem e produtiva, conforme corroborado pela literatura, com predomínio de acidentes de trânsito com lesões ortopédicas e neurológicas associadas.

BACKGROUND: We live in a period of epidemic of trauma. Amputation due to trauma affects a young and economically active population, with costly socioeconomic consequences, becoming a public health problem. OBJECTIVE: To investigate the series of amputations performed at Santa Casa de Campo Grande Hospital between 2005 and 2008. METHODS: Prevalence, descriptive, longitudinal and retrospective study. Convenience sampling was used to conduct a systematic review of medical records of patients undergoing lower and/or upper limb amputations whose diagnosis was trauma incompatible with reconstruction. Patients who arrived at the emergency department with amputated limbs were excluded from the study. We assessed the level of amputation, age, sex, and MESS score for amputation after trauma. The chi-square test and Fisher's exact test were used considering a 95% confidence interval. RESULTS: One hundred and eight amputations were performed in the period. Patients' two to 78 years; mean age was 36.7 ± 12 years, and median age was 35 years. Most patients were males (72%). The most frequent level of amputation was minor amputations (toes and fingers). The most common cause of amputation was injury resulting from traffic accidents. CONCLUSIONS: In agreement with the literature, trauma amputations affect a young and productive population, with prevalence of traffic accidents with associated orthopedic and neurological injuries.