Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 23
Filter
1.
Arq. bras. cardiol ; 120(1): e20220892, 2023. tab, graf
Article in Portuguese | LILACS, CONASS, SES-SP, SESSP-IDPCPROD, SES-SP | ID: biblio-1420149
2.
J. appl. oral sci ; 31: e20220489, 2023. graf
Article in English | LILACS-Express | LILACS | ID: biblio-1430629

ABSTRACT

Abstract Objective: This study aimed to evaluate neuronal markers in stromal cells from human exfoliated deciduous teeth (SHED) and standardize the isolation and characterization of those cells. Methodology: Healthy primary teeth were collected from children. The cells were isolated by enzymatic digestion with collagenase. By following the International Society for Cell and Gene Therapy (ISCT) guidelines, SHED were characterized by flow cytometry and differentiated into osteogenic, adipogenic, and chondrogenic lineages. Colony-forming unit-fibroblasts (CFU-F) were performed to assess these cells' potential and efficiency. To clarify the neuronal potential of SHED, the expression of nestin and βIII-tubulin were examined by immunofluorescence and SOX1, SOX2, GFAP, and doublecortin (DCX), nestin, CD56, and CD146 by flow cytometry. Results: SHED showed mesenchymal stromal cells characteristics, such as adhesion to plastic, positive immunophenotypic profile for CD29, CD44, CD73, CD90, CD105, and CD166 markers, reduced expression for CD14, CD19, CD34, CD45, HLA-DR, and differentiation in three lineages confirmed by staining and gene expression for adipogenic differentiation. The average efficiency of colony formation was 16.69%. SHED expressed the neuronal markers nestin and βIII-tubulin; the fluorescent signal intensity was significantly higher in βIII-tubulin (p<0.0001) compared to nestin. Moreover, SHED expressed DCX, GFAP, nestin, SOX1, SOX2, CD56, CD146, and CD271. Therefore, SHED had a potential for neuronal lineage even without induction with culture medium and specific factors. Conclusion: SHEDs may be a new therapeutic strategy for regenerating and repairing neuronal cells and tissues.

3.
Braz. arch. biol. technol ; 65: e22200620, 2022. graf
Article in English | LILACS-Express | LILACS | ID: biblio-1364468

ABSTRACT

Abstract: Asthma is a chronic respiratory disease affecting 300 million people worldwide. It results in several structural changes in the airways, which are minimally accessible in clinical practice. Cell therapy using mesenchymal stromal cells (MSCs) is a promising strategy for treating asthma due to the paracrine activity of MSCs, which influences tissue regeneration and modulates the immune response. Studies using extracellular vesicles (EV) released by MSCs have demonstrated their regenerative properties in animal models. The aim of this study was to evaluate the potential of EVs isolated from human bone marrow MSCs (hBM-MSCs) to control lung tissue remodeling in ovalbumin-induced allergic asthma in Balb/c mice. We isolated hBM-MSCs from a single donor, expanded and characterized them, and then isolated EVs. Asthma was induced in 43 male Balb/c mice, divided into four groups: control, asthmatic (AS), asthmatic plus systemic EVs (EV-S), and asthmatic plus intratracheal EVs (EV-IT). Upon completion of asthma induction, animals were treated with EVs either locally (EV-IT) or intravenously (EV-S). Seven days after, we performed bronchoalveolar lavage (BAL) and the total nuclear cells were counted. The animals were euthanized, and the lungs were collected for histopathological analysis of the airways. The EV-S group showed improvement in only the total BAL cell count compared with the AS group, while the EV-IT group showed significant improvement in almost all evaluated criteria. Therefore, we demonstrate that the local application of EVs derived from hBM-MSCs may be a potential treatment in controlling asthma.

4.
Arch. endocrinol. metab. (Online) ; 65(3): 342-351, May-June 2021. tab, graf
Article in English | LILACS | ID: biblio-1285166

ABSTRACT

ABSTRACT Objective: Adipose tissue-derived stromal/stem cells (ASCs) and vitamin D have immunomodulatory actions that could be useful for type 1 diabetes (T1D). We aimed in this study to investigate the safety and efficacy of ASCs + daily cholecalciferol (VIT D) for 6 months in patients with recent-onset T1D. Materials and methods: In this prospective, dual-center, open trial, patients with recent onset T1D received one dose of allogenic ASC (1 x 106 cells/kg) and cholecalciferol 2,000 UI/day for 6 months (group 1). They were compared to patients who received chol-ecalciferol (group 2) and standard treatment (group 3). Adverse events were recorded; C-peptide (CP), insulin dose and HbA1c were measured at baseline (T0), after 3 (T3) and 6 months (T6). Results: In group 1 (n = 7), adverse events included transient headache (all), mild local reactions (all), tachycardia (n = 4), abdominal cramps (n = 1), thrombophlebitis (n = 4), scotomas (n = 2), and central retinal vein occlusion at T3 (n = 1, resolution at T6). Group 1 had an increase in basal CP (p = 0.018; mean: 40.41+/-40.79 %), without changes in stimulated CP after mixed meal (p = 0.62), from T0 to T6. Basal CP remained stable in groups 2 and 3 (p = 0.58 and p = 0.116, respectively). Group 1 had small insulin requirements (0.31+/- 0.26 UI/kg) without changes at T6 (p = 0.44) and HbA1c decline (p = 0.01). At T6, all patients (100%; n = 7) in group 1 were in honeymoon vs 75% (n = 3/4) and 50% (n = 3/6) in groups 2 and 3, p = 0.01. Conclusions: Allogenic ASC + VIT D without immunosuppression was safe and might have a role in the preservation of β-cells in patients with recent-onset T1D. ClinicalTrials.gov: NCT03920397.


Subject(s)
Humans , Stem Cells/cytology , Cholecalciferol/therapeutic use , Mesenchymal Stem Cell Transplantation , Diabetes Mellitus, Type 1/drug therapy , Pilot Projects , Adipose Tissue/cytology , Prospective Studies
5.
Rev. bras. ortop ; 53(1): 45-52, Jan.-Feb. 2018. tab, graf
Article in English | LILACS | ID: biblio-899238

ABSTRACT

ABSTRACT Objective: To evaluate the ability of the eluate from fibrin-rich plasma (FRP) membrane to induce proliferation and differentiation of isolated human adipose-derived stem cells (ASCs) into chondrocytes. Method: FRP membranes were obtained by centrifugation of peripheral blood from two healthy donors, cut, and maintained in culture plate wells for 48 h to prepare the fibrin eluate. The SCATh were isolated from adipose tissue by collagenase digestion solution, and expanded in vitro. Cells were expanded and treated with DMEM-F12 culture, a commercial media for chondrogenic differentiation, and eluate from FRP membrane for three days, and labeled with BrdU for quantitative assessment of cell proliferation using the High-Content Operetta® imaging system. For the chondrogenic differentiation assay, the SCATh were grown in micromass for 21 days and stained with toluidine blue and aggrecan for qualitative evaluation by light microscopy. The statistical analysis was performed using ANOVA and Tukey's test. Results: There was a greater proliferation of cells treated with the eluate from FRP membrane compared to the other two treatments, where the ANOVA test showed significance (p < 0.001). The differentiation into chondrocytes was visualized by the presence of mucopolysaccharide in the matrix of the cells marked in blue toluidine and aggrecan. Conclusions: Treatment with eluate from FRP membrane stimulated cell proliferation and induced differentiation of the stem cells into chondrocytes, suggesting a potential application of FRP membranes in hyaline cartilage regeneration therapies.


RESUMO Objetivo: Avaliar a capacidade do eluato proveniente da membrana de plasma rico em fibrina (PRF) de induzir proliferação e diferenciação das células-tronco humanas isoladas de tecido adiposo (CTDAh) em condrócitos. Método: As membranas de PRF foram obtidas por centrifugação de sangue periférico de dois indivíduos saudáveis, cortadas, colocadas em poços de placa de cultivo por 48 h para obtenção do eluato de fibrina. As CTDAh foram isoladas do tecido adiposo por digestão com solução de colagenase e expandidas in vitro. As células foram expandidas e tratadas com meio de cultivo DMEM-F12, meio comercial para diferenciação condrocítica, e eluato de fibrina durante três dias e marcadas com BrdU para avaliação quantitativa da proliferação celular com o uso do sistema de imagens High-Content Operetta®. Para o ensaio de diferenciação condrogênica, as CTDAh foram cultivadas em micromassa por 21 dias e coradas com azul de toluidina e agrecana para avaliação qualitativa em microscópio óptico. As avaliações estatísticas foram feitas por meio dos testes Anova e Tukey. Resultados: Houve uma maior proliferação das células tratadas com o eluato de fibrina comparativamente com os outros dois tratamentos, nos quais o teste Anova apontou significância (p < 0,001). A diferenciação em condrócitos foi visualizada pela presença de mucopolissacarídeos na matriz das células tratadas com meio de diferenciação ou eluato e marcação positiva para agrecana. Conclusões: O tratamento com o eluato da membrana de fibrina estimulou a proliferação celular e induziu a diferenciação das células-tronco em condrócitos, o que sugere uma potencial aplicação da membrana de PRF nas terapias de regeneração de cartilagem hialina.


Subject(s)
Humans , Cartilage , Membranes , Platelet-Rich Plasma , Regeneration
6.
Ciênc. rural ; 44(6): 1066-1072, June 2014. ilus, tab
Article in Portuguese | LILACS | ID: lil-709604

ABSTRACT

A lesão medular é incapacitante, irreversível e de custo econômico e social elevado. Neste estudo, objetivou-se padronizar um modelo de lesão medular, que produza paraplegia, com o uso de cateter e avaliar histologicamente a efetividade da lesão para estudos com terapia celular. Foram realizadas as lesões medulares em ratos Wistar, utilizando-se o cateter Fogarty n.3 e compressão na região toracolombar (T8-T9) durante 5 minutos. Foram estudados três grupos: grupo A, animais controle sem lesão medular; grupo B, animais submetidos à lesão, utilizando-se 50µL de compressão; grupo C, animais submetidos à lesão, utilizando-se 80µL de compressão. Foi realizada avaliação motora pela aplicação da escala BBB, antes da compressão, após recuperação anestésica, 24 e 72 horas depois da compressão e sete dias após a compressão. Após o sétimo dia da lesão, os animais foram submetidos à eutanásia, foi feita a retirada da medula espinhal, fígado e rins e realizada a análise histológica com a coloração hematoxilina-eosina. A mortalidade variou entre os grupos, com 0% no grupo A, 38,5% no B e 48% no C. Nesses dois últimos grupos, a causa da morte foi edema pulmonar neurogênico, confirmado clínica e histologicamente. As medulas espinhais histologicamente apresentaram diferentes graus de edema, congestão vascular e hemorragia, enquanto que os fígados e os rins apresentaram diferentes graus de congestão vascular e necrose. Em relação à recuperação dos movimentos, no grupo A, verificou-se 100% de escore 21; no B, 25% de escore 21; 37,5% de escore 11; e 37,5% de escore 0; enquanto, no grupo C, verificou-se 100% de escore 0. Conclui-se que o procedimento realizado utilizando-se 80µL de solução salina para preencher o balão do cateter foi mais eficiente, apesar de maior mortalidade, pois apresentou maior porcentagem de animais com lesão completa (paraplegia).


Spinal cord injury is disabling, irreversible and with high economic and social cost. This study aimed to standardize a model of spinal cord injury to induce paraplegia, with a catheter and to evaluate the effectiveness of the histological lesion for further studies with cell therapy. Cord lesions were performed in Wistar rats using the Fogarty catheter n.3 and compression in the thoracolumbar region (T8-T9) for 5 minutes. We studied three groups: A control group without spinal cord injury, B group subjected to 50?L compression injury, C group with animals subjected to 80?L compression injury. Motor evaluation was performed by applying the BBB scale, before compression, after recovery from anesthesia, 24 and 72 hours after compression and 7 days after compression. At the seventh day after injury, the animals were euthanized. The spinal cord, liver and kidneys were removed and a histological analysis was performed with hematoxylin-eosin staining. Mortality varied among groups, it was 0% in group A, 38.5% in group B and 48% in group C. In the latter two groups the cause of death was neurogenic pulmonary edema, clinically and histologically confirmed. Histologically the spinal cord showed different degrees of edema, hemorrhage and vascular congestion, while the liver and kidneys showed different degrees of vascular congestion and necrosis. Regarding movement recovery, in group A it was found a 100% score 21, in group B 25% of score 21, 37.5% score 11 and 37.5% of score zero, whereas in group C there was a 100% of score zero. It is concluded that the procedure performed using 80?L of saline to fill the balloon catheter was more efficient because, although the higher percentage of mortality, it induced a higher percentage of animals with complete injury (paraplegia).

7.
Rev. bras. hematol. hemoter ; 36(3): 202-207, May-Jun/2014. tab, graf
Article in English | LILACS | ID: lil-713677

ABSTRACT

OBJECTIVE: To present the initial results of first three years of implementation of a genetic evaluation test for bone marrow-derived mesenchymal stem cells in a Cell Technology Center. METHODS: A retrospective study was carried out of 21 candidates for cell therapy. After the isolation of bone marrow mononuclear cells by density gradient, mesenchymal stem cells were cultivated and expanded at least until the second passage. Cytogenetic analyses were performed before and after cell expansion (62 samples) using G-banded karyotyping. RESULTS: All the samples analyzed, before and after cell expansion, had normal karyotypes, showing no clonal chromosomal changes. Signs of chromosomal instability were observed in 11 out of 21 patients (52%). From a total of 910 analyzed metaphases, five chromatid gaps, six chromatid breaks and 14 tetraploid cells were detected giving as total of 25 metaphases with chromosome damage (2.75%). CONCLUSION: The absence of clonal chromosomal aberrations in our results for G-banded karyotyping shows the maintenance of chromosomal stability of bone marrow-derived mesenchymal stem cells until the second passage; however, signs of chromosomal instability such as chromatid gaps, chromosome breaks and tetraploidy indicate that the long-term cultivation of these cells can provide an intermediate step for tumorigenesis. .


Subject(s)
Humans , Male , Female , Cytogenetics , Chromosomal Instability , Mesenchymal Stem Cells , Karyotyping
8.
J. appl. oral sci ; 22(3): 218-227, May-Jun/2014. tab, graf
Article in English | LILACS, BBO | ID: lil-711715

ABSTRACT

Stem cell-based regenerative medicine is one of the most intensively researched medical issues. Pre-clinical studies in a large-animal model, especially in swine or miniature pigs, are highly relevant to human applications. Mesenchymal stem cells (MSCs) have been isolated and expanded from different sources. Objective: This study aimed at isolating and characterizing, for the first time, bone marrow-derived MSCs (BM-MSCs) from a Brazilian minipig (BR1). Also, this aimed to validate a new large-animal model for stem cell-based tissue engineering. Material and Methods: Bone marrow (BM) was aspirated from the posterior iliac crest of twelve adult male BR1 under general anesthesia. MSCs were selected by plastic-adherence as originally described by Friedenstein. Cell morphology, surface marker expression, and cellular differentiation were examined. The immunophenotypic profile was determined by flow cytometry. The differentiation potential was assessed by cytological staining and by RT-PCR. Results: MSCs were present in all minipig BM samples. These cells showed fibroblastic morphology and were positive for the surface markers CD90 (88.6%), CD29 (89.8%), CD44 (86.9%) and negative for CD34 (1.61%), CD45 (1.83%), CD14 (1.77%) and MHC-II (2.69%). MSCs were differentiated into adipocytes, osteoblasts, and chondroblasts as demonstrated by the presence of lipidic-rich vacuoles, the mineralized extracellular matrix, and the great presence of glycosaminoglycans, respectively. The higher gene expression of adipocyte fatty-acid binding protein (AP2), alkaline phosphatase (ALP) and collagen type 2 (COLII) also confirmed the trilineage differentiation (p<0.001, p<0.001, p=0.031; respectively). Conclusions: The isolation, cultivation, and differentiation of BM-MSCs from BR1 makes this animal eligible as a useful large-animal model for stem cell-based studies in Brazil. .


Subject(s)
Animals , Male , Bone Marrow Cells/cytology , Mesenchymal Stem Cells/cytology , Models, Animal , Swine, Miniature , Tissue Engineering/methods , Antigens, CD/analysis , Brazil , Cell Culture Techniques , Cell Differentiation , Cell Survival , Cells, Cultured , Flow Cytometry , Reproducibility of Results , Reverse Transcriptase Polymerase Chain Reaction , Swine
9.
Rev. bras. cir. cardiovasc ; 28(3): 325-330, jul.-set. 2013. ilus
Article in Portuguese | LILACS | ID: lil-697217

ABSTRACT

INTRODUÇÃO: Reoperações da valva mitral apresentam maior índice de complicações quando comparadas com a primeira cirurgia. Com o domínio das técnicas videoassistidas para as primeiras cirurgias da valva mitral, os casos de reoperações passaram a despertar interesse para esses procedimentos menos invasivos. OBJETIVO: Analisar os resultados e as dificuldades técnicas da retroca valvar mitral minimamente invasiva em 10 pacientes. MÉTODO: A circulação extracorpórea foi instalada por meio de colocação de cânulas femorais e cânula na veia jugular interna direita, conduzida em 28 graus de temperatura em fibrilação ventricular. Realizada toracotomia lateral direita com 5 a 6 cm no terceiro ou quarto espaço intercostal. Pericárdio foi descolado apenas na região do átrio esquerdo no ponto da atriotomia. A aorta não foi pinçada. RESULTADOS: Foram avaliados 10 pacientes com idade média de 56,9±10,5 anos. Quatro encontravam-se em ritmo de fibrilação atrial e 6 em ritmo sinusal. O tempo médio entre a primeira operação e a reoperações foi de 11 ± 3,43 anos. O EuroSCORE médio do grupo foi de 8,3 ± 1,82. O tempo médio de fibrilação ventricular e de circulação extracorpórea foi respectivamente 70,9 ± 17,66 min e 109,4 ± 25,37 min. O tempo médio de internamento foi de 7,6 ± 1,5 dias. Não houve óbitos nessa série. CONCLUSÃO: A reoperação da valva mitral pode ser feita por meio de técnicas menos invasivas com bons resultados imediatos e baixa morbimortalidade. Entretanto, esse tipo de cirurgia requer maior tempo de circulação extracorpórea, especialmente nos casos em que o paciente já tenha uma prótese. A presença de uma mínima insuficiência aórtica também torna esse procedimento tecnicamente mais desafiador.


INTRODUCTION: Reoperations of the mitral valve have a higher rate of complications when compared with the first surgery. With the field of video-assisted techniques for the first surgery of mitral valve became routine, reoperation cases began to arouse interest for this less invasive procedures. OBJECTIVE: To assess the results and the technical difficulties in 10 patients undergoing minimally invasive redo mitral valve surgery. METHOD: Cardiopulmonary bypass was installed through a cannula placed in the femoral vessels and right internal jugular vein, conducted in 28 degrees of temperature in ventricular fibrillation. A right lateral thoracotomy with 5 to 6 cm in the third or fourth intercostal space was done, pericardium was displaced only at the point of atriotomy. The aorta was not clamped. RESULTS: Ten patients with mean age of 56.9 ± 10.5 years, four were in atrial fibrilation rhythm and six in sinusal. Average time between first operation and reoperations was 11 ± 3.43 years. The mean EuroSCORE group was 8.3 ± 1.82. The mean ventricular fibrillation and cardiopulmonary bypass was respectively 70.9 ± 17.66 min and 109.4 ± 25.37 min. The average length of stay was 7.6 ± 1.5 days. There were no deaths in this series. CONCLUSION: Mitral valve reoperation can be performed through less invasive techniques with good immediate results, low morbidity and mortality. However, this type of surgery requires a longer duration of cardiopulmonary bypass, especially in cases where the patient already has prosthesis. The presence of a minimal aortic insufficiency also makes this procedure technically more challenging.


Subject(s)
Aged , Female , Humans , Male , Middle Aged , Heart Valve Prosthesis Implantation/methods , Hypothermia, Induced/methods , Mitral Valve/surgery , Thoracic Surgery, Video-Assisted/methods , Cardiopulmonary Bypass , Heart Valve Diseases/surgery , Heart Valve Prosthesis Implantation/adverse effects , Length of Stay , Reproducibility of Results , Reoperation/methods , Time Factors , Treatment Outcome , Thoracotomy/methods , Ventricular Fibrillation/physiopathology
10.
Arq. bras. cardiol ; 99(4): 886-891, out. 2012. graf, tab
Article in Portuguese | LILACS | ID: lil-654257

ABSTRACT

FUNDAMENTO: O transplante cardíaco continua sendo o tratamento de escolha para a insuficiência cardíaca refratária ao tratamento otimizado. Dois métodos diagnósticos apresentam elevada sensibilidade no diagnóstico de episódios de rejeição ao enxerto e Doença Vascular do Enxerto (DVE), causas importantes de mortalidade no pós-transplante. OBJETIVO: Avaliar a relação entre os resultados do ultrassom intracoronariano (USIV) e os laudos das biópsias endomiocárdicas (BX) no seguimento de pacientes submetidos a transplante cardíaco em um serviço de referência brasileiro. MÉTODOS: Foi realizado um ensaio epidemiológico retrospectivo observacional, com pacientes submetidos a transplante cardíaco ortotópico, no período de 2000 a 2009. Foram analisados os prontuários desses pacientes e os resultados dos USIV e BX realizados rotineiramente no seguimento clínico pós-transplante e terapêutica em uso. RESULTADOS: Dos 77 pacientes analisados, 63,63% são do sexo masculino, nas faixas etárias de 22 a 69 anos. Quanto aos resultados dos USIV, 33,96% foram classificados em Stanford classe I, e 32,08%, como Stanford IV. Dos 143 laudos das biópsias, 51,08% tiveram resultado 1R, 3R em 0,69% dos laudos, e 14,48% apresentaram a descrição de efeito Quilty. Todos usaram antiproliferativos, 80,51% usaram inibidores da calcineurina e 19,48% usaram inibidores do sinal de proliferação (ISP). CONCLUSÃO: A avaliação dos pacientes pós-transplante cardíaco por meio do USIV incorpora informações detalhadas para o diagnóstico precoce e sensível da DVE, que são complementadas pelas informações histológicas fornecidas pelas BX, estabelecendo uma possível relação causal entre a DVE e os episódios de rejeição humoral.


BACKGROUND: Cardiac transplantation continues to be the treatment of choice for heart failure refractory to optimized treatment. Two methods have high sensitivity for diagnosing allograft rejection episodes and cardiac allograft vasculopathy (CAV), important causes of mortality after transplantation. OBJECTIVE: To assess the relationship between intravascular ultrasound (IVUS) results and endomyocardial biopsy (BX) reports in the follow-up of patients undergoing cardiac transplantation in a Brazilian reference service. METHODS: A retrospective epidemiological observational study was carried out with patients undergoing orthotopic cardiac transplantation from 2000 to 2009. The study assessed the medical records of those patients and the results of the IVUS and BX routinely performed in the clinical post-transplant follow-up, as well as the therapy used. RESULTS: Of the 77 patients assessed, 63.63% were males, their ages ranging from 22 to 69 years. Regarding the IVUS results, 33.96% of the patients were classified as Stanford class I, and 32.08%, as Stanford class IV. Of the 143 BX reports, 51.08% were 1R, and 0.69%, 3R. The Quilty effect was described in 14.48% of the BX reports. All patients used antiproliferative agents, 80.51% used calcineurin inhibitors, and 19.48% used proliferation signal inhibitors. CONCLUSION: The assessment of cardiac transplant patients by use of IVUS provides detailed information for the early and sensitive diagnosis of CAV, which is complemented by histological data derived from BX, establishing a possible causal relationship between CAV and humoral rejection episodes.


Subject(s)
Adult , Aged , Female , Humans , Male , Middle Aged , Young Adult , Coronary Artery Disease/pathology , Graft Rejection/pathology , Heart Transplantation/pathology , Age Distribution , Biopsy , Brazil , Coronary Artery Disease , Graft Rejection , Heart Transplantation , Retrospective Studies , Risk Factors , Sex Distribution , Transplantation, Homologous/pathology
11.
Arq. bras. cardiol ; 95(3): 283-288, set. 2010. ilus, tab
Article in Portuguese | LILACS | ID: lil-560553

ABSTRACT

FUNDAMENTO: O uso da rosiglitazona tem sido o objeto de extensas discussões. OBJETIVO: Avaliar os efeitos da rosiglitazona nas artérias ilíacas, no local da injúria e na artéria contralateral, de coelhos hipercolesterolêmicos submetidos à lesão por cateter-balão. MÉTODOS: Coelhos brancos machos receberam uma dieta hipercolesterolêmica através de gavagem oral por 6 semanas e foram divididos em 2 grupos: grupo rosiglitazona (GR - 14 coelhos tratados com rosiglitazona por 6 semanas) e grupo controle (GC - 18 coelhos sem rosiglitazona). Os animais foram submetidos a lesão por cateter-balão na artéria ilíaca direita no 14º dia. RESULTADOS: Na artéria ilíaca contralateral, não houve diferença significante na razão entre as áreas intimal e medial (RIM) entre os grupos GR e GC. A rosiglitazona não reduziu a probabilidade de lesões tipo I, II ou III (72,73 por cento vs 92,31 por cento; p=0,30) e lesões tipo IV ou V (27,27 por cento vs 7,69 por cento; p=0,30). Na artéria ilíaca homolateral, a área intimal era significantemente menor no GR quando comparado ao GC (p = 0,024). A área luminal era maior no GR quando comparado ao GC (p < 0,0001). Houve uma redução significante de 65 por cento na IMR no GR quando comparado ao GC (p = 0,021). Nenhum dos critérios histológicos para lesões ateroscleróticas tipos I a V (American Heart Association) foram encontrados na artéria ilíaca homolateral. CONCLUSÃO: Esses achados demonstram que a administração de rosiglitazona por 6 semanas impede a aterogênese no local da lesão, mas não em um vaso distante do sítio da lesão.


BACKGROUND: Rosiglitazone has been the focus of extensive discussion. OBJECTIVE: To evaluate the effects of rosiglitazone on iliac arteries, both at the injury site and the contralateral artery, of hypercholesterolemic rabbits undergoing balloon catheter injury. METHODS: White male rabbits were fed a hypercholesterolemic diet by oral gavage for 6 weeks and divided into two groups as follows: rosiglitazone group (14 rabbits treated with rosiglitazone during 6 weeks) and the control group (18 rabbits without rosiglitazone). Animals underwent balloon catheter injury of the right iliac artery on the 14th day. RESULTS: In the contralateral iliac artery, there was no significant difference in the intima/media layer area ratio (IMR) between the control and rosiglitazone groups. Rosiglitazone did not reduce the probability of type I, II, or III lesions (72.73 percent vs 92.31 percent; p=0.30) and type IV or V lesions (27.27 percent vs 7.69 percent; p=0.30). As for the homolateral iliac artery, the intimal area was significantly lower in the rosiglitazone group, as compared to the control group (p = 0.024). The luminal layer area was higher in the rosiglitazone group vs. the control group (p < 0.0001). There was a significant reduction of 65 percent in the IMR in the rosiglitazone group vs the control group (p = 0.021). None of the histological criteria for type I-V atherosclerotic lesions (American Heart Association) were found in the homolateral iliac artery. CONCLUSION: These findings demonstrate that rosiglitazone given for 6 weeks prevents atherogenesis at the injury site, but not in a vessel distant from the injury site.


FUNDAMENTO: El uso de rosiglitazona ha estado siendo el objeto de extensas discusiones. OBJETIVO: Evaluar los efectos de la rosiglitazona en las arterias ilíacas, en el local de la injuria y en la arteria contralateral, de conejos hipercolesterolémicos sometidos a la lesión por catéter-balón. MÉTODOS: Conejos blancos machos recibieron una dieta hipercolesterolémica a través de gavage oral por 6 semanas y se los dividieron en 2 grupos: grupo rosiglitazona (GR - 14 conejos tratados con rosiglitazona por 6 semanas) y grupo control (GC - 18 conejos sin rosiglitazona). Los animales se sometieron a lesión por catéter-balón en la arteria ilíaca derecha en el 14º día. RESULTADOS: En la arteria ilíaca contralateral, no hubo diferencia significativa en la razón entre las áreas íntima y media (RIM) entre los grupos GR y GC. La rosiglitazona no redujo la probabilidad de lesiones tipo I, II ó III (72,73 por ciento vs 92,31 por ciento; p=0,30) y lesiones tipo IV ó V (27,27 por ciento vs 7,69 por ciento; p=0,30). En la arteria ilíaca homolateral, el área intima era significantemente menor en el GR cuando comparado al GC (p = 0,024). El área luminal era mayor en el GR cuando comparado al GC (p < 0,0001). Hubo una reducción significante del 65 por ciento en la IMR en el GR cuando comparado al GC (p = 0,021). Ningún de los criterios histológicos para lesiones ateroscleróticas tipos I a V (American Heart Association) se encontraron en la arteria ilíaca homolateral. CONCLUSIÓN: Estos hallazgos demuestran que la administración de rosiglitazona por 6 semanas impide la aterogénesis en el local de la lesión, pero no en un vaso distante del sitio de la lesión.


Subject(s)
Animals , Male , Rabbits , Atherosclerosis/prevention & control , Hypercholesterolemia/complications , Iliac Artery/drug effects , Neointima/etiology , Thiazolidinediones/pharmacology , Anti-Inflammatory Agents/pharmacology , Disease Models, Animal , Hypercholesterolemia/metabolism , Iliac Artery/injuries , Iliac Artery/metabolism , Iliac Artery/pathology , Neointima/metabolism , Random Allocation
12.
Arq. bras. cardiol ; 93(2): 159-166, ago. 2009. graf, tab
Article in English, Spanish, Portuguese | LILACS | ID: lil-528309

ABSTRACT

FUNDAMENTO: Na Insuficiência Cardíaca (IC), a atenção especial é necessária não somente em relação à aspectos objetivos ou isolados, mas também às percepções de saúde do paciente. Os aspectos subjetivos podem ajudar os profissionais da saúde a entender e a melhor tratar a IC. OBJETIVO: O objetivo desse estudo foi avaliar simultaneamente os efeitos dos indicadores clínicos da IC na qualidade de vida (QDV). MÉTODOS: Investigamos, através de análise multivariada, a QDV de 101 pacientes ambulatoriais brasileiros, utilizando o questionário de Minnesota (Minnesota Living with Heart Failure Questionnaire), incluindo suas sub-escalas, e sua correlação com as variáveis clínicas e psicológicas, tais como idade, etnia, gênero, parâmetros ecocardiográficos, índice de massa corporal, pressão arterial média de repouso, tempo de diagnóstico, Classificação Funcional de acordo com a NYHA, capacidade funcional através de uma Escala de Atividade Específica, comorbidades, Escore de Risco de Framingham (ERF), teste de função pulmonar (espirometria) e composição corporal. RESULTADOS: A QDV mostrou correlações univariadas significantes com o ecocardiograma: fração de ejeção (p=0,0415), diâmetro diastólico do ventrículo esquerdo (DDVE) (p=0,004), diâmetro sistólico do ventrículo esquerdo (DSVE) (p=0,0001); comorbidades (p=0,002) e teste de função pulmonar: Capacidade Vital Forçada (CVF) (p<0,0001), Volume Expiratório Forçado no 1º segundo (FEV1) (p<0,0001) e Ventilação Voluntária Máxima (VVM) (p=0,001). Na análise multivariada, o protocolo Backward Stepwise detectou importantes variáveis influentes simultâneas (r²=0.60): gênero (0,000178), etnia (p<0,00001), DSVE (p<0,00001), ERF (p=0,000002), CVF (p=0,002027), FEV1 (p<0,00001) e VVM (p=0,00001). CONCLUSÃO: Gênero, etnia, DSVE, ERF, CVF, FEV1 e VVM são preditores independentes de QDV em pacientes com IC. Simultaneamente, eles são responsáveis por cerca de 60 por cento da variância da QDV. Os aspectos biopsicossociais ...


BACKGROUND: In Heart Failure (HF), special attention must be given not only to objective or isolated aspects, but also to the patient's health self-perceptions. Subjective aspects can help healthcare providers understand and better treat HF. OBJECTIVE: The objective of this study was to evaluate the simultaneous effects of clinical indicators of HF on the Quality-of-Life (QOL). METHODS: We investigated, through a multivariate analysis, the QOL of 101 Brazilian HF outpatients using the Minnesota Living with Heart Failure Questionnaire (including subscales) and its correlation to clinical and physiological variables such as age, ethnicity, gender, echocardiogram parameters, body mass index, mean blood pressure at rest, time since diagnosis, Functional Classification according to the NYHA, functional capacity by a Specific Activity Scale, comorbidities, Framingham Score of Cardiac Risk (CR), Lung Function Test (spirometry) and Body Composition. RESULTS: QOL showed significant univariate correlations to the echocardiogram: ejection fraction (p=0.0415), left ventricular diastolic diameter (LVDD) (p=0.004), left ventricular systolic diameter (LVSD) (p=0.0001); comorbidities (p=0.002) and Lung Function Test: Forced Vital Capacity (FVC) (p<0.0001), Forced Expiratory Volume in the 1st second (FEV1) (p<0.0001) and Maximal Voluntary Ventilation (MVV) (p=0.001). In the multivariate analysis, the backward stepwise protocol detected important simultaneous influent variables (r²=0.60): gender (0.000178), ethnicity (p<0.00001), LVSD (P<0.00001), CR (p=0.000002), FVC (p=0.002027), FEV1 (p<0.00001) and MVV (p=0.00001). CONCLUSION: Gender, ethnicity, LVSD, CR, FVC, FEV1 and MVV are independent predictors of HF patients' QOL. Simultaneously, they are responsible for about 60 percent of the QOL variance. Biopsychosocial aspects could contribute to patient and health professional expectations and treatment results.


FUNDAMENTO: En la insuficiencia cardiaca (IC), la atención especial es necesaria no solamente en cuanto a aspectos objetivos o aislados, sino también a las percepciones de la salud del paciente. Los aspectos subjetivos pueden ayudar a los profesionales de la salud a comprender a tratar mejor la IC. OBJETIVO: El objetivo de ese estudio fue evaluar simultáneamente los efectos de los indicadores clínicos de la IC en la calidad de vida (CDV). MÉTODOS: Investigamos, por medio de análisis multivariado, la CDV de 101 pacientes ambulatorios brasileños, con la utilización del cuestionario de Minnesota (Minnesota Living with Heart Failure Questionnaire), incluyendo sus subescalas y su correlación con las variables clínicas y psicológicas, tales como edad, etnia, género, parámetros ecocardiográficos, índice de masa corporal, presión arterial promedio de reposo, tiempo de diagnóstico, Clasificación Funcional de acuerdo con la NYHA, capacidad funcional a través de una Escala de Actividad Específica, comorbilidades, Score de Riesgo de Framingham (ERF), prueba de función pulmonar (espirometría) y composición corporal. RESULTADOS: La CDV presentó correlaciones univariadas significantes con el ecocardiograma: fracción de eyección (p=0,0415), diámetro diastólico del ventrículo izquierdo (DDVI) (p=0,004), diámetro sistólico del ventrículo izquierdo (DSVI) (p=0,0001); comorbilidades (p=0,002) y prueba de función pulmonar: Capacidad Vital Forzada (CVF) (p<0,0001), Volumen Espiratorio Forzado en el 1er segundo (FEV1) (p<0,0001) y Ventilación Voluntaria Máxima (VVM) (p=0,001). En el análisis multivariado, el protocolo Backward Stepwise detectó importantes variables influyentes simultáneas (r²=0.60): género (0,000178), etnia (p<0,00001), DSVI (P<0.00001), ERF (p=0,000002), CVF (p=0,002027), FEV1 (p<0,00001) y VVM (p=0,00001). CONCLUSIÓN: Género, etnia, DSVI, ERF, CVF, FEV1 y VVM son predictores independientes de CDV en pacientes con IC. Simultáneamente, ellos ...


Subject(s)
Female , Humans , Male , Middle Aged , Heart Failure/physiopathology , Quality of Life , Heart Failure , Multivariate Analysis , Regression Analysis , Statistics, Nonparametric , Vital Capacity/physiology
13.
Arq. bras. cardiol ; 92(6): 490-496, jun. 2009. tab
Article in English, Spanish, Portuguese | LILACS | ID: lil-519971

ABSTRACT

FUNDAMENTO: A insuficiência cardíaca (IC) tornou-se um problema de saúde pública com incidência e prevalência aumentadas na última década, consequência do envelhecimento da população e melhoria das terapias farmacológicas e intervencionistas. Esta promove altas taxas de mortalidade e morbidade, refletidas em altas taxas de internações e readmissões hospitalares mesmo em pacientes submetidos às novas terapias, sobretudo o uso de IECA e β - bloqueadores. OBJETIVO: Este estudo é uma análise do impacto que a consulta de enfermagem promove na frequência de internações de pacientes com IC, residentes em Curitiba e região metropolitana - Paraná. MÉTODOS: Diagnóstico de IC e classificação funcional pela NYHA, acesso telefônico, residência em Curitiba ou região metropolitana, expectativa de sobrevida maior que 3 meses de doenças não cardíacas, idade superior a 18 anos, não usuário de drogas ilícitas. Os grupos foram formados por meio de amostragem aleatória simples (sorteio), em que um grupo recebeu atendimento médico usual, consulta de enfermagem e monitoração telefônica quinzenal de caráter educativo, grupo intervenção (GI) e o outro, atendimento médico usual, monitoração telefônica mensal de caráter administrativo e epidemiológico, grupo controle (GC). O acompanhamento se deu durante o período de 6 meses. RESULTADOS: O GI necessitou de 0,25±0,79 internamentos e o GC 1,10 ±1,41; p = 0,037. CONCLUSÃO: A consulta de enfermagem promove redução da frequência de internações hospitalares dos pacientes com IC em tratamento, residentes em Curitiba e região metropolitana.


BACKGROUND: Heart failure (HF) has become a public health problem with increased incidence and prevalence in the last decade, a consequence of the aging of the population and improved pharmacological and interventionist therapies. It has high rates of mortality and morbidity, expressed as high rates of hospitalizations and re-hospitalizations, even in patients submitted to new therapies, especially ACEI and beta-blockers. OBJECTIVE: This study is the analysis of the impact that the nursing consultation has on the frequency of hospitalizations in patients with HF living in the city of Curitiba, state of Parana and its metropolitan region. METHOD: Patients with a iagnosis of HF and New York Heart Association (NYHA) functional classification, with telephone access, living in the city of Curitiba or its metropolitan region, life expectancy > 3 months due to non-cardiac diseases, aged 18 or older, non-users of illicit drugs. The groups were created by simple random allocation (drawing lots) and one group received the usual medical care, nursing consultation and telephone monitoring every 15 days of educational nature, intervention group (IG), whereas the other group received the usual medical care, monthly telephone monitoring of administrative and epidemiological nature, control group (CG). The follow-up was carried out for 6 months. RESULTS: The IG needed 0.25±0.79 and the CG needed 1.10 ±1.41; p = 0.037 hospitalizations. CONCLUSION: The nursing consultation promotes the decrease in the frequency of hospitalizations in patients with HF undergoing treatment and living in the city of Curitiba and its metropolitan region.


FUNDAMENTO: La insuficiencia cardiaca (IC) se convirtió en un problema de salud pública con incidencia y prevalencia aumentadas en la última década, consecuencia del envejecimiento de la población y mejoría de las terapias farmacológicas e intervencionistas. La IC promueve altas tasas de mortalidad y morbilidad, reflejadas en altas tasas de internaciones y readmisiones hospitalarias, aun en pacientes sometidos a las nuevas terapias, sobretodo el uso de IECA y β - bloqueantes. OBJETIVO: Este estudio es un análisis del impacto que la consulta de enfermería promueve en la frecuencia de internaciones de pacientes con IC, residentes en Curitiba y región metropolitana, Paraná. MÉTODOS: Diagnóstico de IC y clasificación funcional por la NYHA, contacto por teléfono, residencia en Curitiba o región metropolitana, expectativa de sobrevida mayor que 3 meses de enfermedades no cardiacas, edad superior a 18 años, no usuario de drogas ilícitas. Los grupos estaban conformados por medio de muestreo aleatorio simple (sorteo), en que un grupo recibió atención médica habitual, consulta de enfermería y monitoreo telefónico quincenal de carácter educativo, grupo intervención (GI) y otro, atención médica habitual, monitoreo telefónico mensual de carácter administrativo y epidemiológico, grupo control (GC). El seguimiento se llevó a cabo durante el período de 6 meses. RESULTADOS: El GI necesitó de 0,25±0,79 internamientos y el GC 1,10 ±1,41; p = 0,037. CONCLUSIÓN: La consulta de enfermería promueve reducción de la frecuencia de internaciones hospitalarias de los pacientes con IC en tratamiento, residentes en Curitiba y región metropolitana.


Subject(s)
Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Heart Failure/nursing , Hospitalization/statistics & numerical data , Practice Patterns, Nurses' , Brazil , Epidemiologic Methods
14.
Rev. bras. cir. cardiovasc ; 23(4): 467-473, out.-dez. 2008. ilus
Article in English, Portuguese | LILACS | ID: lil-506028

ABSTRACT

OBJETIVO: As células progenitoras endoteliais (CPE), caracterizadas pelo marcador CD133+, contribuem para a neovascularização, e o aumento no número dessas células pode ser uma ferramenta terapêutica promissora. O sangue de cordão umbilical humano contém um número significante de CPE, sugerindo a possibilidade do uso destas células para a revascularização de tecidos isquêmicos. O objetivo desse trabalho foi analisar a funcionalidade das células CD133+ diferenciadas in vitro. MÉTODOS: As células diferenciadas foram caracterizadas por citometria de fluxo; a expressão do mRNA de VEGF foi avaliada por RT-PCR e a funcionalidade, por meio de ensaios de formação de túbulos capilares. RESULTADOS: As células diferenciadas perderam os marcadores de CPE, mantiveram em níveis baixos os marcadores das linhagens hematopoética e monocíticas e aumentaram a expressão dos marcadores de células endoteliais adultas. As células diferenciadas apresentaram transcritos no mRNA de VEGF e mostraram-se capazes de formar túbulos capilares in vitro. CONCLUSÃO: As células CD133+ diferenciadas in vitro em células endoteliais demonstraram serem funcionalmente ativas, abrindo perspectiva para seu uso futuro em aplicações terapêuticas.


OBJECTIVE: Endothelial progenitor cells (EPC) caracterized by the CD133+ marker, contribute to the neovascularization. Increasing EPC number in vitro could be a promising therapeutic tool. Human umbilical cord blood maintains a significant number of EPC, suggesting the possibility to use these cells to induce the revascularization of ischemic tissues. The aim of this study was to analize the in vitro function of differentiated CD133+ cells. METHODS: Cells were characterized by flow cytometry, VEGF mRNA expression was evaluated by the RT-PCR analysis and the functionally by essays of capillary tubes formation. RESULTS: Differentiated cells lost EPC markers, maintained low levels of markers for hematopoietic and monocytic cell lines and increased the expression of adult endothelial cell markers. Differentiated cells expressed VEGF mRNA and were capable to induce in vitro capillary tubules formation. CONCLUSION: CD133+ cells differentiated into endothelial cells in vitro are functionally active initiating the possibility of their use in future therapeutic applications.


Subject(s)
Adolescent , Adult , Female , Humans , Young Adult , Antigens, CD , Cell Differentiation/physiology , Endothelial Cells/physiology , Fetal Blood/cytology , Glycoproteins , Neovascularization, Physiologic , Peptides , Stem Cells/physiology , Capillaries , Cells, Cultured , Flow Cytometry , Parturition , Reverse Transcriptase Polymerase Chain Reaction , RNA, Messenger/metabolism , Stem Cells/cytology , Vascular Endothelial Growth Factor A/genetics , Vascular Endothelial Growth Factor A/metabolism , Young Adult
16.
Rev. bras. cir. cardiovasc ; 22(1): 104-110, jan.-mar. 2007. graf
Article in Portuguese | LILACS | ID: lil-454634

ABSTRACT

OBJETIVO: Analisar evolução hospitalar dos pacientes portadores de insuficiência renal crônica (IRC) em hemodiálise, submetidos a operação sem circulação extracorpórea (CEC). MÉTODO: Cinqüenta e um pacientes portadores de IRC foram submetidos à operação sem CEC. A hemodiálise foi realizada no dia anterior à operação e no dia seguinte. A revascularização do miocárdio foi realizada com ponto de LIMA e estabilizador por sucção. RESULTADOS: A idade média foi de 61,28±11,09 anos e 31 (58,8 por cento) pacientes eram do sexo feminino. A classe funcional predominante foi a IV em 21 (41,1 por cento) dos pacientes. A fração de ejeção do ventrículo esquerdo era ruim em 21 (41,1 por cento) pacientes. O EUROSCORE médio desta série de pacientes foi de 7,65±3,83. O número médio de artérias coronárias revascularizadas foi de 3,1±0,78 por paciente. O tempo médio de ventilação mecânica foi de 3,78±4,35 horas. A permanência média na CTI foi de 41,9±13,8 horas, enquanto a média de permanência hospitalar foi de 6,5±1,31 dias. Quanto às complicações, nove (17,6 por cento) pacientes desenvolveram FA e um (1,9 por cento) apresentou quadro de AVC isquêmico, com boa recuperação durante a internação. Não houve óbito nesta série. CONCLUSÃO: Pacientes renais crônicos submetidos à hemodiálise sempre foram uma população de alto risco para revascularização do miocárdio. A ausência de CEC, aparentemente, cursa com baixos índices de morbi-mortalidade nesta população.


OBJECTIVE: To analyze the hospital outcomes of patients, with chronic renal insufficiency in the hemodialysis, submitted to OPCAB. METHOD: Fifty-one patients with chronic renal insufficiency were submitted to OPCAB. Hemodialysis was performed on the day before and the day after the operation. Myocardial revascularization was performed using LIMA's suture and suction stabilization. RESULTS: Fifty-one patients, with an averageof 61.28±11.09 years, were analyzed. Thirty patients (58.8 percent) were female. The predominant functional class was IV in 21 (41.1 percent) of the patients. The left ventricle ejection fraction was dire in 21 (41.1 percent) patients. The mean EUROSCORE of this series was 7.65±3.83 and the mean number of distal anastomosis was 3.1±0.78 per patient. The average time of mechanical ventilation was 3.78±4.35 hours and the mean ICU stay was 41.9±13.8 hours, while the average hospitalization was 6.5±1.31 days. In respect to complications, nine (17.6 percent) of the patients developed atrial fibrilation, and one (1.9 percent) patient presented with a case of ischemic stroke but had a good recovery during hospitalization. There were no deaths in this series. CONCLUSION: Chronic renal patients submitted to hemodialysis were always a high risk population for myocardial revascularization. In this series, the absence of extracorporeal circulation appeared to be safe and efficient in this special subgroup of patients. The operations were performed with low indices of complications, absence of deaths and relatively low stays in the ICU and in hospital.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Myocardial Revascularization , Renal Dialysis , Renal Insufficiency, Chronic , Extracorporeal Circulation , Retrospective Studies , Risk Factors
17.
Arq. bras. cardiol ; 87(4): 512-519, out. 2006. ilus, tab
Article in Portuguese, English | LILACS | ID: lil-438239

ABSTRACT

OBJETIVO: Este estudo tem por objetivo avaliar as alterações vasculares morfológicas e morfométricas induzidas pela braquiterapia com Samário-153 (153 Sm) em coelhos hipercolesterolêmicos, com doses elevadas. MÉTODOS: Foram analisados 43 coelhos hipercolesterolêmicos, brancos, da raça New Zealand, e o total de 86 artérias ilíacas submetidas a lesão por balão de angioplastia. Divididos em três grupos: dois (GI) irradiados com as doses de 15Gy (n=14) e 60Gy (n=36) e um grupo controle (n=36). Foram realizadas avaliação histológica morfométrica e análise histológica qualitativa para análise tecidual. RESULTADOS: Foram observadas uma redução significativa da neoproliferação intimal (NPI) no GI 15 Gy (p<0,0001), uma redução da área de camada média (ACM) (p<0,0001) e por cento estenose (p<0,0001) comparada com os demais grupos. O GI 60 Gy teve o maior índice de PNI, aumento da ACM, AV e porcentagem de estenose. No GI 60 Gy, observou-se maior número de células xantomatosas (GI 60Gy:86,11 por cento e GI 15Gy:14,29 por cento, p<0,0001), tecido amorfo hialino (GI 60Gy:58,33 por cento e GI 15 Gy:0 por cento, p=0,0001) e proliferação vascular (GI60 Gy:30,56 por cento e GI15 Gy:0 por cento, p=0,0221). Outras análises teciduais não apresentaram diferença estatística entre os grupos. CONCLUSÃO: A dose elevada de 60Gy ocasionou intensa proliferação celular considerada radiolesão vascular, ao contrário da dose de 15Gy que apresentou excelente inibição da neo-proliferação intimal.


OBJECTIVE: This study was designed to evaluate vascular morphological and morphometric changes induced by brachytherapy with samarium-153 (Sm-153) at high doses in hypercholesterolemic rabbits. METHODS: Forty-three New Zealand White hypercholesterolemic rabbits were analyzed, and the total of 86 iliac arteries underwent balloon angioplasty injury. The rabbits were divided into three different groups: two irradiation groups (IG) assigned to 15 Gy (n=14) and 60 Gy (n=36) irradiation doses, respectively, and a control group (n = 36). Histomorphometric and qualitative histological analyses were performed for tissue evaluation. RESULTS: Significant reductions were found in neointimal proliferation (NIP) (p< 0.0001), media area (MA) (p<0.0001) and percent stenosis (p<0.0001) in the 15-Gy IG, compared to the other groups. The 60-Gy IG had the higher rate of NIP, increase in media and vessel areas (VA) and percent stenosis. The 60-Gy IG also showed the greatest number of xanthomatous cells (60-Gy IG: 86.11 percent and 15-Gy IG: 14.29 percent, p<0.0001) and the highest amount of hyaline amorphous tissue (60-Gy IG:58.33 percent and 15-Gy IG:0 percent, p=0.0001) and vascular proliferation (60-Gy IG:30.56 percent and 15-Gy IG:0 percent, p=0.0221). No statistically significant differences were found among groups concerning other tissue analyses. CONCLUSION: The high-dose irradiation of 60 Gy resulted in intense cell proliferation considered vascular radiolesion, unlike the 15-Gy dose, which was associated with an excellent inhibition of neointimal proliferation.


Subject(s)
Animals , Rabbits , Aorta, Abdominal/radiation effects , Brachytherapy/adverse effects , Hypercholesterolemia , Iliac Artery/radiation effects , Radioisotopes/adverse effects , Samarium/adverse effects , Aorta, Abdominal/pathology , Disease Models, Animal , Dose-Response Relationship, Radiation , Endothelium, Vascular/pathology , Endothelium, Vascular , Iliac Artery/pathology , Severity of Illness Index , Tunica Intima/pathology , Tunica Intima/radiation effects , Tunica Media/pathology , Tunica Media/radiation effects
18.
Arq. bras. cardiol ; 83(4): 288-299, out. 2004. ilus, tab, graf
Article in English, Portuguese | LILACS | ID: lil-385307

ABSTRACT

OBJETIVO: A terapia celular no miocárdio tem sido realizada fundamentalmente com dois tipos celulares: as células mioblásticas esqueléticas (miogênicas) e as mesenquimais (angiogênicas) com resultados satisfatórios. Foi analisado o resultado do transplante em conjunto destas células (CEM) em ratos infartados. MÉTODOS: Foram induzidos ao infarto do miocárdio, por meio de ligadura da coronária esquerda 26 ratos Wistar. Após uma semana, os animais foram submetidos à ecocardiografia para avaliação da fração de ejeção (FE, por cento) e dos volumes diastólico e sistólico finais do ventrículo esquerdo (VDF, VSF,ml). Após dois dias os animais foram reoperados e divididos em dois grupos: 1) controle (n=10) que recebeu 0,15 ml de meio de cultura e 2) CEM (n=16) que recebeu 7.5x106 células mioblásticas esqueléticas e mesenquimais, heterólogas, na região do infarto. As células foram obtidas a partir da punção da crista ilíaca e da biópsia do músculo esquelético, ambas submetidas à cultura celular in vitro. Após um mês, os animais foram submetidos a nova ecocardiografia. RESULTADOS: Não houve diferença significativa entre os dois grupos quanto a FE, VDF e VSF nos valores ecocardiográficos de base. Um mês após o transplante, foram observados diminuição da FE no grupo controle (29.31 ± 5.6 por cento para 23.54 ± 6.51 por cento p=0.048) e acréscimo da FE no grupo CEM (24.03 ± 8.68 por cento para 31.77 ± 9.06 por cento, p=0.011). Identificou-se a presença de neovasos e fibras musculares, nas regiões de fibrose miocárdica no grupo CEM. CONCLUSAO: O cocultivo das células mioblásticas esqueléticas e das células mesenquimais é funcionalmente efetivo.


Subject(s)
Animals , Rats , Bone Marrow Transplantation/methods , Myoblasts, Skeletal/transplantation , Myocardial Infarction/surgery , Ventricular Dysfunction/surgery , Coculture Techniques , Endomyocardial Fibrosis/surgery , Myocardial Infarction/complications , Rats, Wistar , Ventricular Dysfunction/etiology
19.
Braz. j. infect. dis ; 8(3): 206-210, Jun. 2004. tab
Article in English | LILACS | ID: lil-384158

ABSTRACT

The microbiota from the uniforms of 31 professionals from the general intensive care unit was analyzed. The samples were collected in duplicate at the beginning and at the end of the work period. Total viable counts of microorganisms were determined; there was a significant increase in the counts at the end of the period, when compared with those obtained at the beginning. No significant difference was observed between the first and second counts obtained from the cuffs. However, differences were observed for the samples from the abdominal region. Among the isolated pathogens 11/18 were Staphylococcus aureus, 2/18 were Acinetobacter baumannii, 2/18 were Klebsiela pneumoniae and 1/18 were Serratia rubidae. Some of these isolates were multi-resistant to antibiotics. Emphasis should be placed on reducing the spread of these pathogens in the hospital, making sure that biosafety protocols are followed by the staff.


Subject(s)
Humans , Anti-Bacterial Agents , Gram-Negative Bacteria , Gram-Positive Bacteria , Health Personnel , Intensive Care Units , Protective Clothing , Cross Infection , Microbial Sensitivity Tests
SELECTION OF CITATIONS
SEARCH DETAIL