Research progress of target temperature management on protective mechanism of cardiac function after cardiac arrest / 中华危重病急救医学

Targeted temperature management (TTM) has been partially applied in patients with restoration of spontaneous circulation (ROSC) after cardiac arrest (CA). In the 2020 American Heart Association (AHA) cardiopulmonary resuscitation (CPR) guidelines, TTM is used as advanced life support after ROSC for the treatment of patients with CPR. TTM has a protective effect on cardiac function after CA, but the specific mechanism of its protective effect on cardiac function remains unclear. In this paper, the basic experimental progress, clinical trial progress and development prospect of TTM on the protective mechanism of cardiac function after CA are reviewed.

Numerical Study on the Process of Human Brain Cooling Treated by Hemoperfusion Mild Hypothermia / 中国医疗器械杂志

Mild hypothermia, as a common means of intraoperative nerve protection, has been used in clinical practice. Compared with the traditional methods such as freezing helmet and nasopharyngeal cooling, hypothermic blood perfusion is considered to be a promising treatment for mild hypothermia, but it lacks experimental and theoretical verification of its cooling effect. In this study, the commercial finite element simulation software COMSOL combined the Pennes equation with the cerebrovascular network model to construct a new simplified human brain model, which was further used to simulate the cooling process of cerebral hypothermic blood perfusion. When the hypothermic blood perfusion was 33 ℃, the human brain could enter the mild hypothermic state within 4 minutes. By comparing with helmet cooling, the feasibility and efficiency of the blood perfusion scheme were verified. By comparing with the calculation results based on Pennes equation, the rationality of the model constructed in this study were verified. This model can non-intrusively predict the changes of brain temperature during surgery, and provide a reference for the setting of treatment parameters such as blood temperature, so as to provide personalized realization of safer and more effective mild hypothermia neuro protection.

Clinical efficacy of mild therapeutic hypothermia with different rewarming time on neonatal hypoxic-ischemic encephalopathy: a prospective randomized controlled study / 中国当代儿科杂志

OBJECTIVES@#To investigate the clinical efficacy of mild therapeutic hypothermia (MTH) with different rewarming time on neonatal hypoxic-ischemic encephalopathy (HIE).@*METHODS@#A prospective study was performed on 101 neonates with HIE who were born and received MTH in Zhongshan Hospital, Xiamen University, from January 2018 to January 2022. These neonates were randomly divided into two groups: MTH1 group (n=50; rewarming for 10 hours at a rate of 0.25°C/h) and MTH2 group (n=51; rewarming for 25 hours at a rate of 0.10°C/h). The clinical features and the clinical efficacy were compared between the two groups. A binary logistic regression analysis was used to identify the factors influencing the occurrence of normal sleep-wake cycle (SWC) on amplitude-integrated electroencephalogram (aEEG) at 25 hours of rewarming.@*RESULTS@#There were no significant differences between the MTH1 and MTH2 groups in gestational age, 5-minute Apgar score, and proportion of neonates with moderate/severe HIE (P>0.05). Compared with the MTH2 group, the MTH1 group tended to have a normal arterial blood pH value at the end of rewarming, a significantly shorter duration of oxygen dependence, a significantly higher proportion of neonates with normal SWC on aEEG at 10 and 25 hours of rewarming, and a significantly higher Neonatal Behavioral Neurological Assessment score on days 5, 12, and 28 after birth (P<0.05), while there was no significant difference in the incidence rate of rewarming-related seizures between the two groups (P>0.05). There were no significant differences between the two groups in the incidence rate of neurological disability at 6 months of age and the score of Bayley Scale of Infant Development at 3 and 6 months of age (P>0.05). The binary logistic regression analysis showed that prolonged rewarming time (25 hours) was not conducive to the occurrence of normal SWC (OR=3.423, 95%CI: 1.237-9.469, P=0.018).@*CONCLUSIONS@#Rewarming for 10 hours has a better short-term clinical efficacy than rewarming for 25 hours. Prolonging rewarming time has limited clinical benefits on neonates with moderate/severe HIE and is not conducive to the occurrence of normal SWC, and therefore, it is not recommended as a routine treatment method.

A neonatal intelligent regulation system based on the combination of mild hypothermia mattress and hyperbaric oxygen chamber: introduction to a patent / 中国当代儿科杂志

Neonatal hypoxic-ischemic encephalopathy (HIE) is a common disease that affects brain function in neonates. At present, mild hypothermia and hyperbaric oxygen therapy are the main methods for the treatment of neonatal HIE; however, they are independent of each other and cannot be combined for synchronous treatment, without monitoring of brain function-related physiological information. In addition, parameter setting of hyperbaric oxygen chamber and mild hypothermia mattress relies on the experience of the medical practitioner, and the parameters remain unchanged throughout the medical process. This article proposes a new device for the treatment of neonatal HIE, which has the modules of hyperbaric oxygen chamber and mild hypothermic mattress, so that neonates can receive the treatment of hyperbaric oxygen chamber and/or mild hypothermic mattress based on their conditions. Meanwhile, it can realize the real-time monitoring of various physiological information, including amplitude-integrated electroencephalogram, electrocardiogram, and near-infrared spectrum, which can monitor brain function, heart rate, rhythm, myocardial blood supply, hemoglobin concentration in brain tissue, and blood oxygen saturation. In combination with an intelligent control algorithm, the device can intelligently regulate parameters according to the physiological information of neonates and give recommendations for subsequent treatment.

Hipotermia terapêutica na encefalopatia hipóxico-isquêmica neonatal: revisão integrativa / Therapeutic hypothermia in neonatal hypoxic-ischemic encephalopathy: integrative review / Hipotermia terapéutica em la encefalopatía hipóxico-isquémica neonatal: revisión integrativa

Objetivo: identificar evidências acerca do uso seguro da hipotermia terapêutica em recém-nascidos. Método: revisão integrativa realizada entre junho e julho de 2018, em fontes eletrônicas da Biblioteca Virtual de Saúde e PubMed, por meio da pergunta:"Que evidências podem subsidiar o cuidado de enfermagem voltado para a redução de sequelas em recém-nascidos submetidos à hipotermia terapêutica?".Foram eleitos nove artigos para análise, sendo oito internacionais e um nacional. Resultados:o resfriamento deve acontecer por 72 horas, com hipotermia leve. As indicações para inclusão no protocolo foram: primeiras seis horas de vida, idade gestacional maior que 35 semanas e acidose na primeira hora de vida.São cuidados essenciais: monitoração hemodinâmica, observação da pele, controle térmico retal, vigilância do Eletroencefalograma de Amplitude Integrada. Conclusão: a terapêutica apresenta benefícios, porém sua aplicação depende de protocolo institucional e treinamento das equipes com foco nas potenciais complicações.

Objective: to identify the evidence on safe use of therapeutic hypothermia in newborns. Method: integrative review of the literature, conducted between June and July of 2018, in electronic sources from the Virtual Health Library and PubMed, through the question: "What evidence can support nursing care aimed at reducing sequelae in newborns undergoing therapeutic hypothermia?". Analysis was conducted for nine selected article, being eight from international literature and one from Brazilian national literature. Results: cooling should occur for 72 hours with mild hypothermia. Indications for inclusion in the protocol were: first six hours of life, gestational age greater than 35 weeks and acidosis in the first hour of life. Essential care includes hemodynamic monitoring, skin observation, rectal thermal control, Integrated Amplitude Electroencephalogram surveillance. Conclusion: the therapy has benefits, but its application depends on institutional protocol and team training focusing on potential complications.

Objetivo: identificar la evidencia sobre el uso seguro de la hipotermia terapéutica en recién nacidos. Método: revisión integradora de la literatura, realizada entre junio y julio de 2018, en fuentes electrónicas de la Biblioteca Virtual de Salud y PubMed, a través de la pregunta: "¿Qué evidencia puede apoyar la atención de enfermería dirigida a reducir las secuelas en los recién nacidos que sufren hipotermia terapéutica?". Se realizaron análisis para nueve artículos seleccionados, ocho de literatura internacional y uno de literatura nacional brasileña. Resultados: el enfriamiento debe ocurrir durante 72 horas con hipotermia leve. Las indicaciones para la inclusión en el protocolo fueron: primeras seis horas de vida, edad gestacional mayor de 35 semanas y acidosis en la primera hora de vida. El cuidado esencial incluye monitoreo hemodinámico, observación de la piel, control térmico rectal, vigilancia integrada de electroencefalograma de amplitud. Conclusión: la terapia tiene beneficios, pero su aplicación depende del protocolo institucional y del entrenamiento del equipo, enfocándose en posibles complicaciones.

Induction of selective liver hypothermia prevents significant ischemia/reperfusion injury in Wistar rats after 24 hours

Purpose To investigate the effects of induction of selective liver hypothermia in a rodent model. Methods Seven male Wistar rats were subjected to 90 minutes of partial 70% liver ischemia and topic liver 26°C hypothermia (H group). Other seven male Wistar rats were subjected to 90 minutes of partial 70% normothermic liver ischemia (N group). Five additional rats underwent a midline incision and section of liver ligaments under normothermic conditions and without any liver ischemia (sham group). All animals were sacrificed 24-h after reperfusion, and livers were sampled for analyses. Pathology sections were scored for sinusoidal congestion, ballooning, hepatocelllular necrosis and the presence of neutrophilic infiltrates. Results At the end of the experiment, liver tissue expressions of TNF-ɑ, IL-1β, iNOS and TNF-ɑ/IL-10 ratio were significantly reduced in the H group compared to N group, whereas IL-10 and eNOS were significantly increased in H group. Histopathological injury scores revealed a significant decrease in ischemia/reperfusion (I/R) injuries in H group. Conclusion Selective liver hypothermia prevented I/R injury by inhibiting the release of inflammatory cytokines, preserves microcirculation, prevents hepatocellular necrosis and leukocyte infiltration, allowing maintenance of the liver architecture.

Conocimientos y actitudes sobre encefalopatía hipóxico-isquémica e hipotermia terapéutica: Resultados de una intervención educativa / Knowledge and attitudes on hypoxic-ischemic encephalopathy and therapeutic hypothermia: Results of an educational intervention

Antecedentes: La asixia perinatal, producida al feto/neonato por hipoxia y/o hipoperfusión tisular, puede llevar a ence-falopatía hipóxico-isquémica (EHI). La hipotermia terapéutica (HT) es eicaz para tratar EHI moderada/severa. Objetivo: Determinar conocimientos y actitudes sobre EHI e HT del personal sanitario y estudiantes antes y después de una intervención educativa, Departamento de Pediatría, Hospital Escuela (HE), Tegucigalpa, 2019. Métodos: Estudio cuasi experimental. Médicos, enfermeras, estudiantes de grado y posgrado fueron invitados a participar mediante consentimiento informado. El ensayo consistió en evaluación pre-intervención (Fase 1), seguida de intervención educativa, video y documento enviados por aplicación WhatsApp, y evaluación post-intervención (Fase 2). Se registraron características sociodemográicas. Se evaluó conocimientos (Excelente, Muy bueno, Bue-no, Deiciente) y actitudes (Buena, Regular, Mala, Muy mala). Se midió el cambio (Delta Porcentaje) entre proporción de participantes de acuerdo a conocimientos y actitudes pre y post-intervención. Resultados: De 181 potenciales participantes, en Fase 1 participaron 147 (81.2%) y en Fase 2, 127 (70.2%). Inicialmente, 93.2% (137) demostró un conocimiento deiciente y actitud buena 38.0% (56), regular 28.0% (41), mala 32.0% (47). El conocimiento bueno aumentó en 561.2% (3.1% versus 20.5%), conocimiento muy bueno aumentó en 185.1% (4.7% versus 13.4%), conocimiento deiciente disminuyó en 35.9% (92.2% versus 59.1%). La actitud regular au-mentó en 37.0% (27.0% versus 37.0%), actitud mala disminuyó 30.4% (32.8% versus 22.8%). Discusión: La intervención educativa mejoró conocimiento y actitud en relación a HT y EHI. La HT disponible en HE puede mejorar el desenlace de EHI. Se recomienda fortalecer las medidas educativas institucionales sobre el protocolo de HT...(AU)

Multiple renal tumorectomy in a Von Hipple Lindau patient. Combined retro/transperitoneal approach with intracorporeal hypotermia

ABSTRACT Objective & Introduction: To show the feasibility of a combined transperitoneal (TP) and retroperitoneal (RP) laparoscopic approach in a Von Hipple-Lindau (VHL) patient with multiple kidney tumors. VHL is an autosomal dominant inherited syndrome characterized by a high incidence of benign and malignant tumors and cysts in many organs. Renal cell carcinoma is one of the most common and a leading cause of mortality (1). Surgical approach is usually complex because of its multiplicity and the need of maximum kidney function preservation due to the risk of future recurrences (2, 3). Intracorporeal renal hypothermia may be useful in these cases to prevent permanent renal function loss (4). Materials and Methods: A 40 years old male was being monitored for multiple bilateral renal masses. Family history included a VHL syndrome affecting his mother and sister. Past medical history included a VHL syndrome with multiple cerebellar and medular hemangioblastomas, a pancreatic cystoadenoma and bilateral kidney tumors which had significantly grown up during follow-up. The patient was scheduled for laparoscopic multiple partial nephrectomy. A combined TP and RP approach with intracorporeal hypothermia was chosen. Results: A total of six right kidney tumors were removed. Operative time was 240 min. Cold ischemia time was 50 min. Average kidney temperature was 23.7°C. Blood losses were negligible. The patient was discharged after 72 hours. No major changes in serum creatinine were found during the follow-up. Final pathology revealed a clear cell renal cell carcinoma, pT1a, ISUP grade 2 in most of the tumors but one ISUP grade 3. Surgical margins were negative. Conclusions: Combined TP and RP is a feasible alternative for the treatment of multiple renal tumors. It's safe and effective, allowing the use of intracorporeal hypothermia which may improve postoperative renal function. Consistent experience is needed before embarking on this surgery.

Intracorporeal renal hypothermia with ice slush for robot-assisted partial nephrectomy in a highly complex renal mass

ABSTRACT

Hypothermia post-cardiopulmonary resuscitation with low inputs: an experience report / Hipotermia post-ressuscitación cardiopulmonar con bajos insumos: relato de experiencia / Hipotermia pós ressuscitação cardiopulmonar com baixos insumos: relato de experiência

ABSTRACT Objective: to report the experience of conducting directed temperature control of a post-cardiopulmonary resuscitation patient, with reduced and basic inputs available at the institution. Method: an experience report of directed temperature control in patient (age 15 years), after four hours of cardiopulmonary resuscitation in an Intensive Care Unit of a hospital in São Paulo State countryside in 2016, according to the protocol suggested by the American Heart Association, in 2015. There were applications of cold compresses, plastic bags with crushed ice and rectal temperature control. Results: after eight hours, temperature had reached 93.2 ºF. Body cooling was maintained for 24 hours. However, bags with crushed ice were used in the first 6 hours. Conclusion: conduct of nurses to obtain the body cooling with reduced and basic inputs was effective during the stay at the Intensive Care Unit.

RESUMEN Objetivo: relatar la experiencia de la conducción de control dirigido de la temperatura de una paciente después de la resucitación cardiopulmonar, con insumos reducidos y básicos disponibles en la institución. Método: el informe de experiencia de control direccionado de la temperatura en paciente (edad 15 años), después de cuatro horas de resucitación cardiopulmonar en una Unidad de Terapia Intensiva de un hospital del interior del estado de São Paulo, en el año 2016, conforme protocolo sugerido por la American Heart Association en 2015. Se utilizaron aplicaciones de compresas embebidas en agua helada, bolsas plásticas con hielo triturado y control de la temperatura rectal. Resultados: en ocho horas, la temperatura alcanzó los 34 ºC. El enfriamiento corporal se mantuvo durante 24 horas, sin embargo, las bolsas con hielo triturado se utilizaron en las primeras 6 horas. Conclusión: la conducta de los enfermeros para obtener el enfriamiento corporal con insumos reducidos y básicos, se mostró efectiva durante la permanencia en la Unidad de Terapia Intensiva.

RESUMO Objetivo: relatar a experiência da condução de controle direcionado da temperatura de uma paciente pós ressuscitação cardiopulmonar, com insumos reduzidos e básicos disponíveis na instituição. Método: relato de experiência de controle direcionado da temperatura em paciente (idade 15 anos) após quatro horas de ressuscitação cardiopulmonar em uma unidade de terapia intensiva de um hospital do interior do Estado de São Paulo, no ano de 2016, conforme protocolo sugerido pela American Heart Association 2015. Utilizou-se aplicações de compressas embebidas em água gelada, sacos plásticos com gelo triturado e controle da temperatura retal. Resultados: em oito horas a temperatura atingiu 34ºC. O resfriamento corporal foi mantido por 24 horas, todavia os sacos com gelo triturado foram utilizados nas primeiras 6 horas. Conclusão: a conduta dos enfermeiros para obter o resfriamento corporal com insumos reduzidos e básicos, mostrou-se efetiva durante a permanência na unidade de terapia intensiva.

Selective head cooling and whole body cooling as neuroprotective agents in severe perinatal asphyxia

SUMMARY INTRODUCTION The possibility that hypothermia has a therapeutic role during or after resuscitation from severe perinatal asphyxia has been a longstanding focus of research. Studies designed around this fact have shown that moderate cerebral hypothermia, initiated as early as possible, has been associated with potent, long-lasting neuroprotection in perinatal patients. OBJECTIVES To review the benefits of hypothermia in improving cellular function, based on the cellular characteristics of hypoxic-ischemic cerebral injury and compare the results of two different methods of cooling the brain parenchyma. METHODS Medline, Lilacs, Scielo, and PubMed were searched for articles registered between 1990 and 2019 in Portuguese and English, focused on trials comparing the safety and effectiveness of total body cooling with selective head cooling with HIE. RESULTS We found that full-body cooling provides homogenous cooling to all brain structures, including the peripheral and central regions of the brain. Selective head cooling provides a more extensive cooling to the cortical region of the brain than to the central structures. CONCLUSIONS Both methods demonstrated to have neuroprotective properties, although full-body cooling provides a broader area of protection. Recently, head cooling combined with some body cooling has been applied, which is the most promising approach. The challenge for the future is to find ways of improving the effectiveness of the treatment.

RESUMO INTRODUÇÃO A possibilidade de a hipotermia ter um papel terapêutico durante ou após a reanimação da asfixia perinatal grave tem sido um foco de pesquisa de longa data. Estudos desenhados em torno desse fato mostraram que a hipotermia cerebral moderada, iniciada o mais cedo possível, tem sido associada à neuroproteção potente e duradoura em espécies perinatais. OBJETIVOS Resumidamente, analisar os benefícios da hipotermia na melhoria da função celular, com base nas características celulares da lesão cerebral hipóxico-isquêmica e comparar os resultados de dois métodos diferentes de resfriamento do parênquima cerebral. MATERIAL E MÉTODOS Medline, Lilacs, SciELO e PubMed foram pesquisados para artigos registrados entre 1990 e 2019 nos idiomas português e inglês, com foco em estudos comparando segurança e eficácia do resfriamento corporal total com o resfriamento seletivo da cabeça com EHI. RESULTADOS Descobrimos que o resfriamento de corpo inteiro fornece resfriamento homogêneo para todas as estruturas cerebrais, incluindo as regiões periférica e central do cérebro. O resfriamento seletivo da cabeça fornece um resfriamento mais amplo para a região cortical do cérebro do que para as estruturas centrais. CONCLUSÕES Ambos os métodos demonstraram ter propriedades neuroprotetoras, embora o resfriamento de corpo inteiro forneça uma área mais ampla de proteção. Recentemente, o resfriamento da cabeça combinado com algum resfriamento corporal foi aplicado e essa é a maneira mais promissora. O desafio para o futuro é encontrar formas de melhorar a eficácia do tratamento.

Hypothermia treatment ameliorated cyclin-dependent kinase 5-mediated inflammation in ischemic stroke and improved outcomes in ischemic stroke patients

OBJECTIVES: The inflammatory response is a key mechanism of neuronal damage and loss during acute ischemic stroke. Hypothermia has shown promise as a treatment for ischemic stroke. In this study, we investigated the molecular signaling pathways in ischemic stroke after hypothermia treatment. METHODS: Cyclin-dependent kinase 5 (CDK5) was overexpressed or silenced in cultured cells. Nuclear transcription factor-κB (NF-κB) activity was assessed by measurement of the luciferase reporter gene. An ischemic stroke model was established in Sprague-Dawley (SD) rats using the suture-occluded method. Animals were assigned to three groups: sham operation control, ischemic stroke, and ischemic stroke + hypothermia treatment groups. Interleukin 1β (IL-1β) levels in the culture supernatant and blood samples were assessed by ELISA. Protein expression was measured by Western blotting. RESULTS: In HEK293 cells and primary cortical neuronal cultures exposed to hypothermia, CDK5 overexpression was associated with increased IL-1β, caspase 1, and NF-κB levels. In both a murine model of stroke and in patients, increased IL-1β levels were observed after stroke, and hypothermia treatment was associated with lower IL-1β levels. Furthermore, hypothermia-treated patients showed significant improvement in neurophysiological functional outcome. CONCLUSIONS: Overall, hypothermia offers clinical benefit, most likely through its effects on the inflammatory response.

Effects of hypothermia on lung inflammation in a rat model of meconium aspiration syndrome

Abstract Purpose: To evaluate the effects of hypothermia treatment on meconium-induced inflammation. Methods: Fifteen rats were instilled with human meconium (MEC, 1.5 mL/kg, 65 mg/mL) intratracheally and ventilated for 3 hours. Eight rats that were ventilated and not instilled with meconium served as a sham group. In MEC-hypothermia group, the body temperature was lowered to 33±0.5°C. Analysis of the blood gases, interleukin (IL)-1β, IL-6, IL-8, and tumor necrosis factor (TNF)-α in bronchoalveolar lavage (BAL) fluid samples, and histological analyses of the lungs were performed. Results: The BAL fluid TNF-α, IL-1β, IL-6 and IL-8 concentrations were significantly higher in the MEC-hypothermia group than in the MEC-normothermia (p < 0.001, p < 0.001, p = 0.001, p < 0.001, respectively) and sham-controlled groups (p < 0.001, p < 0.001, p < 0.001, p < 0.001, respectively). Conclusion: Meconium-induced inflammatory cytokine production is affected by the body temperature control.

Effects of remote ischemic preconditioning and topical hypothermia in renal ischemia-reperfusion injury in rats

Abstract Purpose: To evaluate whether combining hypothermia and remote ischemic preconditioning (RIPC) results in protection from ischemia-reperfusion (IR). Methods: Thirty-two Wistar rats underwent right nephrectomy and were randomly assigned to four experimental protocols on the left kidney: warm ischemia (group 1), cold ischemia (group 2), RIPC followed by warm ischemia (group 3), and RIPC followed by cold ischemia (group 4). After 240 minutes of reperfusion, histological changes in the left kidney, as well as lipid peroxidation and antioxidant enzyme activity, were analyzed. The right kidney was used as the control. Serum creatinine was collected before and after the procedures. Results: RIPC combined with hypothermia during IR experiments revealed no differences on interventional groups regarding histological changes (p=0.722). Oxidative stress showed no significant variations among the groups. Lower serum creatinine at the end of the procedure was seen in animals exposed to hypothermia (p<0.001). Conclusions: Combination of RIPC and local hypothermia provides no renal protection in IR injury. Hypothermia preserves renal function during ischemic events. Furthermore, RIPC followed by warm IR did not show benefits compared to warm IR alone or controls in our experimental protocol.

Combined effects of melatonin and topical hypothermia on renal ischemia-reperfusion injury in rats

Abstract Purpose: To evaluate whether their combination was more effective than either alone in decreasing renal damage due to ischemia/reperfusion (I/R) injury in rats. Methods: Thirty-two Wistar rats were assigned to four groups. Following right nephrectomy, their left kidneys were subjected to warm ischemia (IR), cold ischemia (TH+IR), intraperitoneal injection of 10 mg/kg melatonin (MEL+IR), or injection of 10 mg/kg melatonin followed by cold ischemia (MEL+TH+IR). Eight randomly assigned right kidneys constituted the control group. After 240 min of reperfusion, left nephrectomy was performed for histopathological evaluation, lipid peroxidation, and measurement of antioxidant enzyme activity. Serum was collected to measure urea and creatinine concentrations. Results: Histopathological damage induced by ischemia and reperfusion was more attenuated in the MEL+TH+IR group than in the MEL+IR and TH+IR groups (p<0.037). Superoxide dismutase activity was significantly higher (p<0.029) and creatinine (p<0.001) and urea (p<0.001) concentrations were significantly lower in the MEL+TH+IR group than in the MEL+IR and TH+IR groups. Conclusion: The combination of melatonin (MEL) and topical hypothermia (TH) better protects against renal I/R injury than does MEL or TH alone.

Hipotermia neuroprotetora tardia / Late hypothermic neuroprotection

A parada cardiorrespiratória é um evento de alta mortalidade. A isquemia cerebral difusa relacionada ao hipofluxo cerebral frequentemente leva à injúria neurológica grave e ao desenvolvimento de estado vegetativo persistente. A hipotermia terapêutica representa um importante avanço no tratamento da encefalopatia anóxica pós-parada cardíaca. Seus efeitos neuroprotetores têm sido amplamente demonstrados em várias situações de isquemia neuronal. Apesar de ser um procedimento associado com redução de mortalidade nestes pacientes, a hipotermia ainda é um tratamento subutilizado no manejo da síndrome pós-ressuscitação. Nosso objetivo foi demonstrar que a hipotermia neuroprotetora tem efeito benéfico mesmo realizada tardiamente naqueles pacientes comprovadamente encefalopatas como consequência de baixo fluxo cerebral devido à parada cardiorrespiratória que mantém um nível neurológico baixo (Glasgow abaixo de 8). Este fato é demonstrado pelo não uso de substâncias neurodepressoras nas últimas 48 horas, e o ganho para o paciente seria maior que os prováveis riscos que a hipotermia pode ocasionar. Este relato mostra os efeitos benéficos no paciente submetido ao tratamento da hipotermia neuroprotetora tardiamente, evoluindo satisfatoriamente, visto que foi devolvido à sociedade em Glasgow 14 e com independência suficiente para atender suas necessidades humanas básicas. Era um paciente do sexo masculino, 25 anos, pardo, solteiro, imigrante ilegal oriundo da Bolívia, auxiliar de costura, com história de mal súbito enquanto praticava futebol com amigos em quadra ao ar livre. Deu entrada no pronto-socorro em parada cardiorrespiratória por taquicardia ventricular. Foram realizadas manobras de reanimação com cardioversão elétrica e massagem cardíaca e não houve relato do tempo de parada cardíaca. Foi transferido para a unidade de terapia intensiva adulto com hipótese diagnóstica de encefalopatia anóxica pós-parada cardiorrespiratória sem uso de drogas vasoativas em Glasgow 6.(AU)

Cardiac arrest is a high-mortality event. Brain hypoflow-related diffuse cerebral ischemia often leads to severe neurological injury, and to the development of a persistent vegetative state. Therapeutic hypothermia is an important advance in the treatment of anoxic encephalopathy after cardiac arrest. Its neuroprotective effects have been widely demonstrated in several situations of neuronal ischemia. Although the procedure is associated with reduced mortality, hypothermia is still an underused treatment in the management of post-resuscitation syndrome. Our goal was to demonstrate that neuroprotective hypothermia is effective even when performed late in patients with encephalopathies from brain hypoflow due to cardiac arrest with a low neurological level (Glasgow below 8). This is demonstrated by the lack of neurodepressant substances in the previous 48 hours, and patient benefit would be higher than the probable risks that hypothermia could cause. This report shows the beneficial effects in the patient undergoing delayed neuroprotective hypothermia, who progressed satisfactorily, since taken back to Glasgow 13 with sufficient independence to meet basic human needs. The patient was a male of 25 years old, dark-skinned, single, an illegal immigrant from Bolivia, sewing assistant, with a history of sudden cardiac arrest, which occured while playing soccer outdoors. He was admitted to the emergency room in cardiopulmonary arrest (CPA) due to ventricular tachycardia. Resuscitation maneuvers with electrical cardioversion and cardiac massage were performed, and there is no reported time of cardiac arrest. He was transferred to the Adult Intensive Care Unit with a diagnosis hypothesis of anoxic encephalopathy after cardiac arrest, with no use of vasoactive drugs in Glasgow 6.(AU)

The effects of local ischemic preconditioning and topical hypothermia in renal ischemia/reperfusion injury in rats

Abstract Purpose: Topical hypothermia and local ischemic preconditioning have been shown to reduce renal ischemia-reperfusion (I/R) injury individually. We examined whether combination of both strategies lessens renal I/R injury. Methods: Post right nephrectomy, 40 male Wistar rats were randomly assigned to five experimental protocols performed in the left kidney: topical hypothermia without ischemia (TH), warm ischemia (IR), ischemic preconditioning followed by warm ischemia (IPC+IR), cold ischemia (TH+IR), and ischemic preconditioning followed by cold ischemia (IPC+TH+IR). Eight randomly assigned right kidneys constituted the control group. After 240 min of reperfusion, the left kidney was retrieved to evaluate histological changes, lipid peroxidation and antioxidant enzymes activity. Serum was collected to evaluate urea and creatinine. Results: IPC+TH+IR group revealed no difference to any other group subjected to ischemia in relation to histological changes, lipid peroxidation and antioxidant enzymes activity. Creatinine was lower in IPC+TH+IR group compared with IPC+IR, but showed no difference compared to TH+IR group. Conclusions: Combination of local ischemic preconditioning (IPC) and topical hypothermia conferred no protection in renal I/R injury. Moreover, local IPC solely followed by warm ischemia impaired renal function more than warm ischemia alone.

Effect of mild hypothermia on renal ischemia/reperfusion injury after cardiopulmonary resuscitation in a swine model

Abstract Purpose: To investigate the effect of intravascular cooling on renal function after resuscitation. Methods: Twenty four pigs were randomized into three groups (n=8 in each group): therapeutic hypothermia group (TH group), normothermia group (NH group) and sham operation group (SHAM group). After 6 minutes of untreated VF, CPR was performed. Upon ROSC, the TH group received the intravascular cooling. The NH and SHAM group did not undergo therapeutic hypothermia. Haemodynamic parameters were recorded. The bloods were analyzed for serum creatinine (sCr), CysC and NGAL. The kidney was surgically removed observe pathologic changes under a light microscope. Results: The sCr increased in both TH and NH groups after ROSC, compared to baseline. Between two groups, the sCr and creatinine clearance (Cc) showed lower level in the TH group. The urine volume per hour in the TH group were higher during cooling. After resuscitation, NGAL and CysC in the NH group were higher than in the TH group. Under the light microscope, compared with the TH group, the renal injury was prominent in the NH group. Conclusion: Mild hypothermia had a protection to renal ischemia reperfusion injury after resuscitation.

Actualización en la fisiopatología y manejo de traumatismo raquimedular: revisión bibliográfica / Actualization in pathophysiology and management of traumatic spinal cord injury: literature review

El Traumatismo Raquimedular (TRM) implica todas las lesiones traumáticas que dañan los huesos, ligamentos, músculos, cartílagos, estructuras vasculares, radiculares o meníngeas a cualquier nivel de la médula espinal. Las consecuencias personales, familiares, sociales y económicas de esta enfermedad, hacen que sea un tema relevante en la actualidad. El propósito de esta revisión es entregar al lector las herramientas elementales sobre el TRM, y está principalmente enfocada en el tratamiento, el cual se aborda estrechamente relacionado con la fisiopatología para comprender los mecanismos moleculares y biomecánicos de trauma, incluyendo sus complicaciones y el manejo de éstas. Respecto al tratamiento del TRM, se aborda la evidencia que ofrecen las terapias actualmente validadas y las aún controversiales, incluyendo los glucocorticoides, la reducción cerrada y la cirugía precoz. Además las terapias emergentes como la hipotermia terapéutica, los nuevos agentes neuroprotectores que se encuentran en fases preclínicas y clínicas de estudio como el riluzol, la minociclina, el litio, los antagonistas opioides, entre otros, y los agentes neurorregenerativos como el Cethrin y el Anti-Nogo que han mostrado buenos resultados en la recuperación neurológica. Las recomendaciones actuales respecto a la terapia con células madre y subtipos de células madre en la actualidad, es que deben llevarse a cabo sólo en el contexto de ensayos clínicos. Aunque aún no existen terapias que permitan la recuperación neurológica completa en todos o la mayoría de los pacientes, las terapias emergentes prevén un futuro promisorio en los resultados clínicos de los pacientes con TRM.

The traumatic spinal cord injury (TSCI) involves all traumatic injuries that harm the bones, ligaments, muscles, cartilage, vascular, radicular or meningeal structures, at any level of the spinal cord. The personal, family, social and economic consequences of this disease, make it an important issue today. The purpose of this review is to provide the reader, the basic tools of the TRM, and it is mainly aimed at the treatment, which it approaches closely related to the pathophysiology, to understand the molecular and biomechanical mechanisms of trauma, including its complications and his management. Regarding treatment of TSCI, the evidence offered by currently validated and controversial therapies is discussed, including glucocorticoids, closed reduction and early surgery. Also emerging therapies such as therapeutic hypothermia, new neuroprotective agents currently in preclinical and clinical phases as riluzole, minocycline, lithium, opioid antagonists, among others, and neuroregenerative agents like Cethrin and Anti- Nogo that have shown good results in neurological recovery. Current recommendations for therapy with stem cells and subtype stem cell, is that only should be carried out in the context of clinical trials. Although there are not still therapies that allow full neurological recovery in all or most patients, emerging therapies provide a promising future in the clinical outcomes of patients with TRM.