Navegando por Palavras-chave "hipotermia"
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- ItemAcesso aberto (Open Access)Avaliação do efeito da hipotermia por crioimersão corporal, nos neutrófilos e linfócitos sanguíneos de ratos submetidos ao exercício físico agudo(Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular, 2008-12-01) Bachur, José Alexandre; Quemelo, Paulo R.; Bachur, Cynthia A. K.; Domenciano, Julio C.; Martins, Carlos H. G.; Stoppa, Marcos A.; Barros Neto, Turibio Leite de [UNIFESP]; Garcia, Sérgio B.; Universidade de Franca Fisioterapia Unifran. Lab. de Estudos da Recuperação Orgânica e Funcional; Universidade de Franca; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP)Systemic stress induced by exercise increases bioactive substances in plasma which leads to neutrophilic mobilization. Cryotherapy causes a decrease in the inflammatory reaction and attenuates high blood perfusion after exercise. The objective of this work was to analyze the influence of cold water immersion (CWI) after acute exercise on neutrophil and lymphocyte mobilization. A control group of rats (AI) was kept at rest and a second group (AII) was submitted to CWI at 10º C for 10 minutes. The animals of Groups BI, BII, BIII and BIV were submitted to acute exercise which consisted in swimming in water at 31º C for 100 minutes with a load equivalent to 5% of the body weight. Groups CI, CII, CIII and CIV were submitted to CWI immediately after acute exercise. The animals were sacrificed at 6 (I), 12 (II), 24 (III) and 48 (IV) hours after the exercise and neutrophil and lymphocyte cells were counted for all groups by optic microscopy. The Student t-test was used for statistical analysis with a significance level of p< 0.05. A significant increase in the number of neutrophils was observed in Groups AII, BI, BII, BIII, BIV, CI, CII and CIII compared to AI. The neutrophil count of the CIV Group was similar to the Control Group. There was a significant drop in the number of lymphocytes in Groups BII, BIII, BIV, CI and CII when compared to Group AI. The lymphocyte count of Groups AII, BI, CIII and CIV were similar to the Control Group. The changes in neutrophil and lymphocyte counts caused by acute exercise were reverted to normal at 24 hours by cold water immersion.
- ItemAcesso aberto (Open Access)Fatores associados à hipotermia durante o transporte intra-hospitalar em pacientes internados em Unidade de Terapia Intensiva Neonatal(Sociedade de Pediatria de São Paulo, 2011-03-01) Vieira, Anna Luiza P. [UNIFESP]; Dos Santos, Amelia Miyashiro [UNIFESP]; Okuyama, Mariana Kobayashi [UNIFESP]; Miyoshi, Milton Harumi [UNIFESP]; Almeida, Maria Fernanda Branco de [UNIFESP]; Guinsburg, Ruth [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)OBJECTIVE: To determine frequency and factors associated with hypothermia during intra-hospital transports of patients assisted in a neonatal intensive care unit (NICU). METHODS: Cross-sectional study nested in a prospective cohort of infants submitted to intra-hospital transports performed by a trained team from January 1997 to December 2008 at a NICU of a public university hospital. Transports of patients aged more than one year and/or with weight higher than 10kg were excluded. Factors associated with hypothermia during intra-hospital transports were studied by logistic regression analysis. RESULTS: Among the 1,197 transports performed during the studied period, 1,191 (99.5%) met the inclusion criteria. The 640 transported infants had mean gestational age of 35.0±3.8 weeks and birth weight of 2341±888g. They presented the following underline diseases: single or multiple malformations (71.0%), infections (7.7%), peri/intraventricular hemorrhage (5.5%), respiratory distress (4.0%) and others (11.1%). Patients were transported for surgical procedures (22.6%), magnetic resonance (10.6%), tomography imaging (20.9%), contrasted exams (18.2%), and others (27.7%). Hypothermia occurred in 182 (15.3%) transports and was associated with (OR; 95%CI): weight at transport <1000g (3.7; 1.4-9.9), weight at transport 1000-2500g (1.5; 1.0-2.2), pre-transport axillary temperature <36.5°C (2.0; 1.4-2.9), central nervous system malformation (2.8; 1.8-4.4); use of supplemental oxygen (1.6; 1.0-2.5); mechanical ventilation prior to transport (2.5; 1.5-4.0); transport for surgeries (1.7; 1.0-2.7) and the years 2001, 2003 and 2006 (protection factors). CONCLUSIONS: Intra-hospital transports presented increased risk for hypothermia, showing that this kind of transport should be done by skilled teams with adequate equipment.
- ItemAcesso aberto (Open Access)Mild hypothermia reduces polymorphonuclear leukocytes infiltration in induced brain inflammation(Academia Brasileira de Neurologia - ABNEURO, 2005-09-01) Prandini, Mirto Nelso [UNIFESP]; Neves Filho, Antonio [UNIFESP]; Lapa, Antonio José [UNIFESP]; Stávale, João Norberto [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Over the last 50 years deep hypothermia (23(0) C) has demonstrated to be an excellent neuroprotective agent in cerebral ischemic injury. Mild hypothermia (31-33(0) C) has proven to have the same neuroprotective properties without the detrimental effects of deep hypothermia. Mechanisms of injury that are exaggerated by moderate hyperthermia and ameliorated by hypothermia include, reduction of oxygen radical production, with peroxidase damage to lipids, proteins and DNA, microglial activation and ischemic depolarization, decrease in cerebral metabolic demand for oxygen and reduction of glycerin and excitatory amino acid (EAA) release. Studies have demonstrated that inflammation potentiates cerebral ischemic injury and that hypothermia can reduce neutrophil infiltration in ischemic regions. To further elucidate the mechanisms by which mild hypothermia produces neuroprotection in ischemia by attenuating the inflammatory response, we provoked inflammatory reaction, in brains of rats, dropping a substance that provokes a heavy inflammatory reaction. Two groups of ten animals underwent the same surgical procedure: the skull bone was partially removed, the duramater was opened and an inflammatory substance (5% carrageenin) was topically dropped. The scalp was sutured and, for the group that underwent neuroprotection, an ice bag was placed covering the entire skull surface, in order to maintain the brain temperature between 29,5-31(0) C during 120 minutes. After three days the animals were sacrificed and their brains were examined. The group protected by hypothermia demonstrated a remarkable reduction of polymorphonuclear leukocytes (PMNL) infiltration, indicating that mild hypothermia can have neuroprotective effects by reducing the inflammatory reaction.
- ItemAcesso aberto (Open Access)Selective hypothermia: an experimental study on traumatic brain injury in rats(Academia Brasileira de Neurologia - ABNEURO, 2008-06-01) Dvilevicius, Amylcar Edemilson [UNIFESP]; Prandini, Mirto Nelso [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)OBJECTIVE: To evaluate the efficiency of selective hypothermia in the treatment of the traumatic brain injury in rats. METHOD: After the trauma produced for the model of cortical impact, a small craniectomy in the right frontoparietal region was carried through; after the procedure the animals had been divided in two groups of 15 each. Group A, without treatment with hypothermia (control group) and group B, treated with selective hypothermia for a period to 5 to 6 hours. After this time all the animals were sacrificed, their brains had been removed and histopathological analysis was carried through. RESULTS: Comparison between both groups was done using the counting of neurons injured for field. Counting in the control group n=15 had an average of 70.80 neurons injured for field against an average of 21.33 neurons injured for field in group B (submitted to the treatment with hypothermia), with n=15 also. The difference was statiscally significant. CONCLUSION: Based in the quantification of the neurons injured for field, the effectiveness of the treatment with selective hypothermia was demonstrated.