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To study the cognitive effects of diterpene ginkgolides (DG), transient middle cerebral artery occlusion (tMCAO)-induced rats were established. tMCAO-rats induced by suture method were divided into sham operation group, solvent control group, NBP group, DG group. The animal experiments in the present study were performed in accordance with the Ethical Guidelines of the Laboratory Animal Welfare Ethical Committee of Peking Union Medical College (00000646, 00000635). The effects of DG on tMCAO rats were evaluated by neurological severity score, cerebral infarction volume measurement, step-down and Morris water maze test. In the acute tMCAO rat model, 100 mg·kg-1 DG improved the neural score and infarction volume. In the chronic tMCAO rat model, DG 100 mg·kg-1 significantly improved the survival rate of tMCAO-induced rats. The Morris water maze results showed 100 mg·kg-1 DG decreased the latency of tMCAO-induced rats to find the platform, while the effect was weaker than the NBP. However, DG 30 mg·kg-1 did not show a significant effect. In conclusion, DG exerted a therapeutic effect on transient middle cerebral artery occlusion.
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@#Objective To investigate the clinical efficacy of unilateral antegrade selective cerebral perfusion (UASCP) compared to bilateral antegrade selective cerebral perfusion (BASCP) in aortic surgery. Methods PubMed, EBSCO, Web of Science, Cochrane Library, CBM, CNKI, Wanfang Database were searched from establishment of each database to January 2019 to identify clinical studies on prognosis of UASCP versus BASCP in aortic surgery patients. The quality of randomized controlled trials was assessed by Cochrane risk assessement tool. The quality of non-randomized controlled trials was assessed by the Newcastle-Ottawa Scale ( NOS). Meta-analyses were presented in terms of odds ratio (OR) with 95% confidence interval (CI) by using RevMan 5.3 software. Results Sixteen eligible studies including 3 randomized controlled trials, 2 propensity matching score studies, and 11 retrospective case control studies including 4 490 patients were identified. The 3 randomized controlled trials were with high bias risk. The NOS score of the other 13 studies was more than 6 stars. Pooled analysis showed no significant difference between the UASCP and BASCP groups in terms of permanent neurological dysfunction (PND) (OR=0.93, 95%CI 0.74 to 1.18, P=0.57), temporary neurological dysfunction (TND) (OR=1.26, 95%CI 0.94 to 1.69, P=0.12), acute kidney injury rate (OR=1.11, 95%CI 0.79 to 1.55, P=0.55), 30-day mortality (OR=0.94, 95%CI 0.67 to 1.32, P=0.72), length of ICU stay (OR=–0.64, 95%CI –1.66 to 0.37, P=0.22) and hospital stay (OR=–0.35, 95%CI –2.38 to 1.68, P=0.74). Conclusion This meta-analysis shows that UASCP and BASCP administration do not result in different mortality and neurologic morbidity rates. However, more studies with good methodologic quality and large sample are still needed to make further assessment.
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Cerebral?complication?in?the?postoperative?period?of?cardiac?surgery?is?one?of?the?most?important?elements?for?the?prognosis?and?rehabilitation.?It?is?significant?for?the?clinicians?to?recognize,?comprehend,?prevent?and?ameliorate?the?complications?of?cerebral?nervous?system.?For?the?purpose?of?down-regulating?brain?injury?and?cerebral?complications?after?cardiac?surgery,?promoting?nosocomial?rehabilitation,?Cerebral?Protection?in?Cardiac?Intensive?Care?Group,?Neural?Regeneration?and?Repair?Committee,?Chinese?Research?Hospital?Association?organizes?Chinese?medical?experts?who?specialize?in?cardiac?surgery,?critical?care?medicine,?extracorporeal?circulation,?anesthesiology?and?emergency?medicine?cooperatively?draft?Chinese consensus guideline for cerebral protection in the perioperative period of cardiac surgery (2019).?Its?content?includes?brain?injury?classifying?risk?factors?recognizing,?treatment?protocols?formulating,?intra-operative?cerebral?function?monitoring,?brain?protection?in?intensive?care?unit?(ICU)?and?drug?administration?in?order?to?guide?the?clinical?practice.
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With the popularization of cardiopulmonary resuscitation (CPR) technology, the success rate of restoration of spontaneous circulation (ROSC) is gradually improved, and the survival rate and neurological outcome of patients with cardiac arrest are improved. Currently, therapeutic methods for cerebral resuscitation after cardiac arrest are limited. In addition to mild hypothermia for clinical application, the majority of drugs remain in the animal experimental stage. Finding effective brain protection drugs has become a hot spot in the field of brain resuscitation research. This article will review the pharmaceutical progress of research for cerebral resuscitation after cardiac arrest, so that we can study the brain protection mechanism of these drugs better and more targeted.
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Objective@#To observe the changes in cerebral regional oxygen saturation (CrSO2) during neonatal blood exchange transfusion(BET) and its effect on the level of bilirubin in neonates with severe hyperbilirubinemia.@*Methods@#From January 2017 to March 2018, 52 newborns with severe hyperbilirubinemia were hospitalized in the Department of Neonatology, Children′s Hospital of Fudan University.Every newborn was treated with BET.Near infrared spectroscopy was used to monitor CrSO2 in the process of BET.The monitoring lasted from 2 hours before the beginning of BET to 2 hours after the completion of BET.The CrSO2 were recorded every 2 minutes and total surem bilirubin (TSB) and transcutaneous bilirubin(TCB) was measured.During this period, it is accompanied by the monitoring of neonatal body temperature, heart rate, respiration and bolld oxygen saturation(SpO2). The differences in CrSO2 changes at different time points during BET were compared.At the same time, the correlations between CrSO2 and blood oxygen saturation, TSB and TCB levels were analyzed.The results of repeated measurement analysis of variance compared between the two groups were corrected by Bonfferoni.@*Results@#Among the 52 children, there were 33 males (63.46%) and 19 females (36.54%). The gestational age, average birth weight and average head circumference of newborns were (38.6±2.1) weeks, (3 338±444) g and (33.6±3.2) cm, respectively.The Apgar score of newborn was (8.1±1.6) scores at 1 minute after birth.The level of TSB detected for the first time after admission was (457.9±97.8) μmol/L.The CrSO2 after BET (74.6%-76.0%) was significantly higher than that before BET (69.4%-69.0%), and the difference was statistically significant (P<0.05). Correlation analysis showed that during BET, CrSO2 showed a gradual upward trend, SpO2 also showed a synchronous increase, while the level of bilirubin showed a downward trend, and the downward trend of TSB level was more obvious than that of TCB.@*Conclusions@#CrSO2 can reflect the improvement of cerebral oxygenation during neonatal blood exchange transfusion and avoid cerebral hypoxia in the course of treatment.
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Objective:To explore the difference of effect of raw and wine-processed products of Rhei Radix et Rhizoma extract on brain protection of rats with intracerebral hemorrhage(ICH) and the connotation of the theory of "wine processing could promote efficacy" of Rhei Radix et Rhizoma. Method:Wistar male rats were used to establish the ICH model,extracts of raw and wine-processed products of Rhei Radix et Rhizoma were used for intervention,and these rats were randomly divided into 6 groups(blank group,sham-operated group,model group,raw Rhei Radix et Rhizoma group,wine-processed Rhei Radix et Rhizoma group and Angong Niuhuangwan group).Then the apoptosis of hippocampal neurons was detected by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling(TUNEL) assay.The expression of zonula occludens-1(ZO-1) and vascular endothelial cadherin-2(VE-cadherin-2) in the hemorrhagic brain tissue was detected by immunohistochemical assay.The expression of reduced form of nicotinamide-adenine dinucleotide phosphate(NADPH) oxidase 2(NOX2) and tumor necrosis factor-α stimulated gene-6(TSG-6) in the hemorrhagic brain tissue was detected by Western blot.The content of glutathione(GSH) in the serum of ICH rats was detected by automatic enzyme-linked immunosorbent assay systems.Through these above methods,we investigated the differences between raw products and wine-processed products on brain protection of ICH rats. Result:Compared with the sham-operated group,the apoptosis index of the hippocampal neurons in the model group were increased significantly(PPPPPPPPPPPPConclusion:The raw and wine-processed products of Rhei Radix et Rhizoma all have brain protective effect on ICH rat model,but the protective effect of wine-processed products is slightly better than that of raw products.The result of this study provides experimental basis for exploring the theory of "wine processing could promote efficacy" of this herb.
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Objective:To investigate the effect of Longshengzhi capsule (LSZC) on behavior, serum biochemical index, nuclear transcription factor-κB(NF-κB) and cysteine aspartate-specific protease-3(Caspase-3) in stroke rats. Method:Ischaemic stroke was induced by the permanent middle cerebral artery occlusion (pMCAO). The male sprague-dawley rats with successful pMCAO modeling were randomly divided into five groups:model (pMCAO) group, nimodipine (12 mg·kg-1) group and LSZC groups (2.4, 1.2, 0.6 g·kg-1). A sham group also set in the study. The intragastric administration lasted for 14 days. The rats were tested for neurological deficits, grip strength, rotation tolerance. An open field test was also performed to evaluate the behavior. The pathology of the brain was studied by 2,3,5-triphenyltetrazolium chloride (TTC) staining, and hematoxylin and eosin (HE) staining. In addition, the levels of malondialdehyde (MDA), nitric oxide (NO) and superoxide dismutase (SOD) in rat serum were tested in the experiment. Immunohistochemistry (ICH) and Western blot were used to analyze the expressions of Caspase-3 and NF-κB. Result:Compared the model group, LSZC significantly improved the grip strength, rotation tolerance and spontaneous activity. LSZC markedly reduced infarct volume, water content of brain, neurological scores, body weight decline in MCAO stroke rats (PPPPκB. Conclusion:LSZC treatment can improve neurological deficit function and protect the brain of stroke rats. This effect may be realized by down-regulating the expressions of NF-κB and Caspase-3.
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Aim: To investigate the effects of Pien-Tze-Huang (PZH) on mRNA and protein expression of NMDAR1 and GluR2 in cortex of MCAO rats. Methods: Forty healthy adult male Sprague-Dawley rats were randomly divided into three groups: sham, MCAO, MCAO + PZH groups. The rats were subjected to focal cerebral ischemia/reperfusion with suture-occluded method. Neurological deficit testing was performed with Zea Longa scale. The volume of cerebral infarction was evaluated by TTC staining. The mRNA and protein expression of NMDAR1 and GluR2 in cortex of side cerebral ischemic tissues were determined using qPCR and Western blot analysis. Results: Compared with MCAO group, PZH significantly improved the neurological deficit, decreased the volume of cerebral infarction, and up-regulated the mRNA and protein expression of NMDAR1 and GluR2. Conclusions: PZH attenuates the down-regulation of mRNA and protein expression of NMDAR1 and GluR2 after focal cerebral ischemic injury in rats, which may be associated with the cerebral protective effect of PZH.
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Excessive autophagy is one of the crucial factors of cerebral ischemia-reperfusion injury (CIRI), which has been demonstrated to be one of the targets for acupuncture treatment of ischemic stroke. In the present paper, we make a review about the development of acupuncture intervention induced improvement of CIRI (such as reducing the infarction area, improving learning-memory ability and motor function) by regulating autophagy in animal studies. Outcomes showed that acupuncture intervention can function in 1) inhibiting CIRI-induced increase of the number of lysosomes and autophagic lysosomes, and relieving structural injury of mitochondria, and reducing the number of autophagosome in the central region of the ischemic cerebral cortex tissue; 2) down-regulating the expression of microtubule-associated protein Ⅱ light chain 3 (LC3Ⅱ) and the ratio of LC3-Ⅱ/LC3-Ⅰ in the ischemic cerebral region, and 3) regulating the expression of Beclin 1 (autophagy-related gene), promoting the expression of P62 (autophagy-related adaptor protein). In addition, acupuncture can also regulate phosphoinositide 3 kinase (PI3K)- protein kinase B (AKT)- mammalian target of rapamycin complex 1(mTOR) signaling at different time-points (down-regulation at the early stage and up-regulation at the later stage), and activating AMP-activated protein kinase (AMPK)-mTOR- UNC51-like kinase-1 signaling to relieve cerebral ischemic injury. These results reveal some mechanisms of acupuncture therapy underlying improvement of CIRI and provide experimental basis for clinical application of acupuncture therapy in the treatment of ischemic stroke.
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Objective To discuss the surgical characteristics,safety and perioperative management of carotid stent angioplasty (CSA) for the treatment of severe carotid artery stenosis (＞85％).Methods From December 2011 to May 2016,a total of 25 patients with carotid artery stenosis (＞85％) were treated with CSA.According to the stenotic characteristics of the lesion,distal cerebral protection device was employed in performing CSA.During the operation,attention was paid to individualized and detailed surgical management and perioperative management program;the revascularization and the dropping-off of thrombus in cerebral protection device were under close observation,while effort was made to control the occurrence of complications.The patients were followed up for one year to observe the occurrence of ischemic cerebrovascular events.Results The cerebral protection device was successfully deployed after it passed over the severe carotid artery stenosis.After balloon pre-dilation the stent was deployed,and the stent showed satisfactory shape.North America Symptomatic Carotid Endarterectomy Testing (NASCET) showed that the average degree of carotid artery stenosis was decreased from preoperative (91.0±3.1)％ to postoperative (21.0±5.1)％.The protective umbrella was successfully retrieved in all patients,and deciduous tissue fragments were observed in 6 retrieved protective umbrellas.During the perioperative period no severe complications,such as cerebral hemorrhage,cerebral infarction,hyper-perfusion syndrome or death,were observed.All the 25 patients were followed up for one year,and no transient ischemic attack,stroke or death occurred.Conclusion In treating severe carotid artery stenosis with CSA,in order to ensure a successful surgery and patient's safety the following points are very important:in-operative individualized and detailed management,perioperative preventive measures,and use of appropriate cerebral protection device.
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Therapeutic hypothermia (TH), also known as targeted temperature management (TTM), is the intentional reduction of core body temperature to 32-35℃. Mild-to-moderate hypothermia and advanced cooling technology can be used as an effective component of multimodal therapy for ischemic encephalopathy, brain trauma, haemorrhagic stroke, or other forms of severe brain injury and acute neurological injuries to achieve neuroprotection. The events occured after an episode of acute neurological injuries and cerebral ischemia are multiple. And the possible explanation for the neuroprotective benefits of hypothermia therapy is inhibiting metabolic disruption, excitotoxicity, oxidative stress, cell apoptosis signals, inflammatory responses, and promoting neuronal integrity and blood-brain barrier integrity. To know the molecular mechanisms of action of TH, which exerts neuroprotective function, will provide clinicians a better understanding the indications and contraindications of this therapy, and provide a possible theoretical reserves and clinical practice for other therapies when used in conjunction with hypothermia.
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Objective To investigate the improvement of ischemic hypoxic injury of brain after the transplantation of bone marrow mesenchymal stem cells (BMSCs).Methods Rats were randomly (random number) divided into sham operation group,cardiac arrest group and BMSCs treatment group (n =10 in each group).The model of cardiac arrest was induced by asphyxia.One hour after restoration of spontaneous circulation (ROSC),green fluorescent protein labeled BMSCs were transplanted via tail vein injection.At 3 and 7 days after transplantation,frozen sections of hippocampus was stained with hematoxylin-eosin (HE).The rest of brain tissue was weighed by an electronic balance.Brain water content (％) was calculated as (wet weight-dry weight) / wet weight × 100％.Results ①BMSCs were observed in hippocampus at 3 and 7 days after transplantation under fluorescent microscopy.②Compared with sham operation group and BMSCs treatment group,brain water content in cardiac arrest group was higher (all P ＜ 0.05).HE staining results showed that BMSCs transplantation could lessen hypoxia ischemia damage on brain.Conclusions BMSCs reduced the neurons damage induced by cardiac arrest and promoted neurological function recovery.
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Objective To observe the cerebral protective effect of mild hypothermia by semiconductor cooling device on the liver surface in rabbits after cardiac arrest (CA). Methods Eighteen healthy male New Zealand white rabbits were randomly and equally divided into CA control group, ice saline group and semiconductor group. CA was induced by rapid intravenous injection of potassium chloride. Five minutes after onset of CA, CPR was initiated. Compared to the control group, which was not treated by hypothermia intervention after CPR, the ice saline group was treated by 4 ℃ ice saline infusion and the semiconductor group was treated by the semiconductor refrigeration piece device cooling on the liver surface for hypothermia intervention after CPR. We recorded the changes of temperature (tympanic temperature and anus temperature), heart rate (HR), mean arterial pressure (MAP) of rabbits in each group, neurological deficit scores (NDS) at 24, 48, 72 hours after the return of spontaneous circulation (ROSC) and the changes of serum neuron specific enolase (NSE) by enzyme linked immunosorbent assay (ELISA). Pathological changes of the hippocampus tissue, liver tissue and skin tissue were obtained by HE staining. Results There was no significant difference in ROSC time in each group. Two rabbits died at 55 hours and 67 hours after ROSC respectively in the control group. The remaining rabbits survived to 72 hours after challenge. There was no significant difference in the overall survival time in groups. Two hypothermia intervention groups had significantly lower level of serum NSE at 24 hours after ROSC and lower DNS scores at 24, 48, 72 hours after ROSC than control group. And the level of serum NSE after 24 hours of ROSC in the semiconductor group were significantly lower than the ice saline group (μg/L: 6.916±1.161 vs. 8.615±1.430, P < 0.05). DNS scores at 24, 48, 72 hours after ROSC in the semiconductor group were all significantly lower than the ice saline group (scores: 1.33±0.52 vs. 2.00±0.01, 1.01±0.41 vs. 2.00±0.01, 0.92±0.40 vs. 2.10±0.52 respectively, all P < 0.05). Two hypothermia intervention groups had more minor damage of neuronal cell in hippocampus than the control group. And the semiconductor group had more minor damage than the ice saline group. There were no obvious hepatic and subcutaneous tissue injury through which the semiconductor induced hypothermia was performed at corresponding liver surface skin. Conclusion The hypothermia by semiconductor cooling device on the liver surface is a new safe way of protecting brain tissue after CA, which has better cerebral protective effect than ice saline infusion.
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Objective To investigate the brain protective effects of isoflurane preconditioning for local cerebral is-chemia adult rat model by detecting HIF-1α, HO-1 and Bcl-2 expression level. Methods 84 two-month old Spra-gue-Dawley male rats were randomly divided into sham group, ischemia-reperfusion group ( MCAO group) and isoflurance preconditioning group (ISO group). ISO group was exposed to isoflurane for 30 min and then underwent a 90 min middle cerebral arterial occlusion (MCAO), while MCAO group underwent MCAO only. At 24 h after reperfusion all the groups were investigated by modified neurological severity score for neurological deficits, TTC staining for infarct percentage. Cerebral cortices were harvested for HIF-1α, HO-1 and Bcl-2 protein expression level detection at 6 h, 24 h and 72 h after reperfusion using RT-PCR and western blot. Results The mNSS score and infarct percentage in ISO group decreased significantly compared with those of MCAO group at 24 h after reper-fusion(P 0. 05). Conclusion Isoflurane preconditioning plays short-term cerebral protective effect through the up regulation of HIF-1α, HO-1 and Bcl-2 gene expression.
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OBJECTIVE:To observe the cerebral protective effects of dexmedetomidine in brain aneurysm surgery. METH-ODS:48 patients with intracranial aneurysm were randomly divided into observation group and control group,with 24 cases in each group. Observation group was given dexmedetomidine 1 μg/kg,pump time 10 min,at rate of 0.5 μg/kg;control group re-ceived constant volume of normal saline. Hemodynamic changes,the levels of S100β protein and neuron specific enolase (NSE) were compared between 2 groups. RESULTS:The heart rate and mean arterial blood pressure were more stable in the observation group after medication,with statistical significance(P<0.05). The serum level of S100β protein at the end of operation(T5),6 h after operation(T6),12 h after operation(T7),24 h after operation(T8)were(1.52±0.35)μg/L,(1.69±0.33)μg/L,(1.72±0.42)μg/L,(2.08±0.57)μg/L;the serum level of NSE were(10.9±1.2)ng/L,(13.5±1.5)ng/L,(16.8±2.8)ng/L and(19.7±4.3)ng/L in observation group;those were all lower than in control group,with statistical significance(P<0.05). CONCLUSIONS:Dexme-detomidine for cerebral aneurysm operation is helpful for hemodynamics stability,and result in lower S100β protein and NSE. So it is important for cerebral protection.
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Objective To explore the administration of Dexmedetomidine combined with remifentanil for sedation and analgesia of ICU patients with hypertensive cerebral hemorrhage after operation.Methods A total of 60 patients with hypertensive cerebral hemorrhage treated with hematoma removal under craniotomy were selected from May 2013 to June 2015.The patients were randomly (random number) divided into the Dexmedetomidine combined with remifentanil group (D + R, n =30), and Midazolam combined with remifentanil group (M + R, n =30).The blood pressure, respiration rate, oxygen saturation, heart rate, ICP (intracranial pressure), Ramsay sedation scores, and IL-1, and TNF-α levels were recorded after sedation and analgesia in ICU, and 6 h, 24 h, 48 h after operation (T0-T3).Results Compared with M +R group, the MAP, RR, HR, ICP, IL-1β, TNF-α, rate of reoperation for check bleeding, and mortality were significantly decreased in D + R group (P ＜ 0.05), and Ramsay sedation score was significantly increased at the same time (P ＜ 0.05) without excessive sedation and analgesia noticed.Conclusions Dexmedetomidine combined with remifentanil exhibits significant benefit in many respects including control of great fluctuations of blood pressure and intracranial pressure after craniotomy, reduce the production and release of inflammatory mediators, reduce the occurrence of rebleeding after operation.It shows good controllability and safety, it is an optimal method producing sedation and analgesia in ICU patients with hypertensive cerebral hemorrhage after operation.
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Autophagy is the process of removing the lysosomal and use of degradation products,which can keep the balance of protein metabolism and maintain a stable cellular environment,thus autophagy is extensively involved in various pathophysiological processes.In recent years,although there has been some progress in the molecular and regulation mechanisms of autophagy,however,the research on autophagy and nervous system diseases has only just begun.Studies of rats with brain damage have shown that injection of autophagy inhibitors reduced extent of convulsions.Therefore we put forward scientific hypothesis that autophagy is associated with brain injury and signal transduction,and autophagy may aggravate brain damage by certain signaling pathways.This article outlines the new progresses of autophagy and autophagy inhibitors,and further explore its effects on the nervous system.
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Objective To evaluate the the protectice effect of dexmedetomidine combined limb remote ischemic postcondition on alleviating focal cerebral ischemic reperfusion injury in rats .Methods 48 healthy adult male SD rats were randomly divided into 4 groups(n= 12) :control group(C) ,limb remote ischemic postcondition group(R) and dexmedetomidine postconditioning group(D) and combination group(R/D) .The rat model of focal cerebral ischemic reperfusion injury was induced by middle cerebral artery oc‐clusion(MCAO) .The group C only received MCAO ,the left femoral artery was isolated without blocking ;the group R received 120 min brain ischemia ,the left femoral artery was occluded by 3 cycles of 10 min occlusion/10 min reperfusion before brain reperfu‐sion ;the group D received dexmedetomidine 3 μg/kg by intraperitoneal injection before brain reperfusion .The group R/D combined the above two kinds of processing method .The neurologic function was evaluated at 24 h of reperfusion and then the rats were sac‐rificed at 48 h of reperfusion .The brain was removed for determining the cerebral infarct volume .Results The neurologic function scores after 24 h reperfusion in the group D ,R and R/D were superior to those in the group C (P< 0 .01) .The rat cerebral infarct volume percentages after 48 h reperfusion in the group D ,R and R/D were significantly lower than those in the group C ( P <0 .01) .The infarct area volume percentage in the group R/D was significantly lower than that in the group R ,the difference showed statitistical significance(P< 0 .01) .The infarct volume percentage in group R/D was significantly decreased compared with the group D(P< 0 .05) .Conclusion Both dexmedetomidine and limb remote ischemic postcondition can attenuate the focal cerebral is‐chemic reperfusion injury in rats .Their combination can significantly reduce the cerebral infarction volume and has synergic protec‐tion effect .
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Objective To research the reasonable perfusion flow of cardiopulmonary bypass during aortic arch procedure of patients with acute type A aortic dissection.Methods Forty patients suffered from acute Stanford type A aortic dissection had been divided into two groups randomly.Group A named traditional perfusion flow group,group B named modified perfusion flow group.Monitoring cerebral blood flow and cerebral tissue oxygen during deep hyperthermia circulatory arrest and antegrade aelective cerebral perfusion procedure by transcranial doppler(TCD) and near-infrared spectroscopy(NIRS).The concentration of S100 protein and lactic acid was measured at six time point.Results Statistical difference of mean blood flow velocity of MCA had been found between two group 3 min after total flow reperfusion.TOI was more tban 60％ during study in both of groups.S100 protein in group A was significantly higher than group B at T6,T7 and T8.Statistical difference of blood lactic concentration had been found between two groups,(4.88± 1.62) mmol/L in group A,(3.83± 1.48) mmol/L in group B,P ＜ 0.05.Safe consciousness time between two groups was difference,(7.36± 2.86) h in group A and (5.27± 3.11) h in group B,P ＜ 0.05.Conclusion Compared with the traditional perfusion flow,modified perfusion flow can provide sufficient cerebral perfusion and prevent the luxury perfusion.
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Objective To investigate the protective effect of trichostatin-A (TSA) on cerebral ischemia/reperfusion injury via Janus kinase/signal transducer and activator of transcription (JAK/STAT) signal pathway.Methods 36 male SD rats were randomly (random number) divided into 3 groups:shamoperated group,ischemia/reperfusion (I/R) group and TSA group.Rat model of middle cerebral artery occlusion/reperfusion (MCAO) was established using a modified filament method.No occlusion was applicated to the sham-operated group.TSA group was injected with TSA 0.05 mg/kg via penile vein,20 minutes before operation.Reperfusion was carried out 24 hours after modeling.Longa 5 score was used to assess the neurological function,and TTC staining was applied to calculate the percentage of cerebral infarction area,The expression of JAK2 and p-JAK2 proteins was detected by Elisa.Results The low expression of JAK2 was observed in each group,and there was no statistical difference between groups (P =0.266).Compared with I/R group,TSA group had lower score in cerebral ischemia-reperfusion injury assessment (P=0.019),smaller area of cerebral infarction (P ＜0.01),reduced expression of p-JAK2 (P =0.009),all of which were of significant difference.Condusions TSA can reduce the cerebral ischemia/reperfusion injury via JAK/STAT signal pathway by down regulating p-JAK2 expression.