Objective To evaluate the myocardial protective effect of hyperpolarized heart arrest at different temperature during cardiopulmonary bypass CPB.Methods Eighteen dogs were randomly allocated to be infused with St.Thomas solution containing 50?mol/L pinacidil and 5mmol/L K + at 37℃ (group A) or 4℃ (group B), or the standard St.Thomas solution containing K + 16mmol/L at 4℃ (group C) respectively, through aortic root after aortic clamping . The global surgical ischemia lasted 60min with the declamping of 20min .The activities of serum myocardial enzymes, and levels of lipid peroxide and adenine nucleotide of myocardium were measured.Results All paramaters showed to occur serious ischemic and reperfusion damages during the whole procedures in group C, while there were the mild damages in two hyperpolarized groups, especially in group B.Conclusions Myocardial protective effect of hyperpolarized arrest induced with pinacidil, an ATP sensitive potassium channel opener, is superior to that of traditional hyperkalemic cardioplegia , which is much more prominent in hypothermic state.

Objective To evaluate the myocardial protective effect of hyperpolarized arrest induced with ATP-sensitive potassium channel opener ,pinacidil in vitroMethods Twenty-four rabbit hearts were randomly divided into three groups : hypothermic hyperpolarized group (LH group), normothermic hyperpolarized group ( WH group), and hyperkalemic control group (group C) The isolated rabbit hearts with a Langendorff apparatus were perfused oxygenated Krebs-Henseleit's solution (K-H) for 10 min and followed by cardioplegia The cardioplegia consisted of StThomas solution with either traditional high potassium (16mmol/L KCl, 4 ℃, group C), or pinacidil 50?mol/L (4 ℃ in LH group or 37 ℃ in WH group ) with 5mmol/L KCl The hearts were subjected to 40 min perfusional occlusion and followed by 20 min reperfusionResults Hearts were arrested quickly in LH group, and a little slowly in WH group, but rebeated quickly , which were different significantly from those in group C ; Recovery of LVP and left ventricle contracility in LH group and WH group were remarkedly faster than those in group C (P

AIM: To investigate the effect of diazoxide (D) postconditioning on Cardiac function and mito-chondrial cardiolipin in isolated rat heart and to explore the protective effect of ATP sensitive potassium channel on diazo-xide postconditioning myocardium.METHODS: The myocardial ischemia/reperfusion injury model in isolated rat hearts was established by Langendorff apparatus.The isolated rat hearts were randomized into 4 groups ( n=8): control group ( control) , myocardial ischemia/reperfusion injury group ( I/R) , diazoxide postconditioning group ( I/R+D) , 5-hydroxy decanoic acid (5-HD) plus diazoxide postconditioning group (I/R+5-HD+D).The hearts in each group were started with 20 min perfusion for equilibration.The hearts in control group perfused for 70 min;The hearts in I/R group was global ischemia for 40 min after ischemia reperfusion at 4℃ST.Thomas cardioplegia, then reperfusion for 30 min;The hearts in I/R+D group were treated with diazoxide (50μmol/L) in K-H perfusion for 5 min after global ischemia for 40 min, then reperfusion for 25 min;The hearts in I/R+5-HD+D group were treated with 5-HD (100μmol/L) in K-H perfusion for 5 min before diazoxide postconditioning, then reperfusion for 20 min.The heart rate, coronary outflow volume, heart func-tion, myocardial enzymes and myocardial mitochondrial cardiolipin at the end of perfusion in each group were determined. RESULTS:Compared with control group and I/R+D group, the heart rate, the concentration of heart phospholipid and the coronary outflow volume were reduced, the heart function was significantly impaired the contents of myocardial enzymes were increased in I/R group.However, no significant difference between I/R group and I/R+5-HD+D group was ob-served.CONCLUSION:The diazoxide postconditioning protects the myocardium by increasing mitochondrial cardiolipin content, reducing the release of myocardial enzymes, improving heart function and reducing myocardial reperfusion injury. The myocardial protective effect of diazoxide is completely blocked by 5-hydroxy decanoic acid.

Objective To evaluate the effects of ischemic postconditioning on mitochondrial cardiolipin synthesis during myocardial ischemia-reperfusion (Ⅰ/R) in rats in vitro.Methods Healthy male Sprague-Dawley rats,aged 16-20 weeks,weighing 250-350 g,were used in the study.The animals were anesthetized with intraperitoneal pentobarbital sodium 40 mg/kg and received intraperitoneal heparin 250 U/kg.Their hearts were excised and retrogradely perfused in a Langendorff apparatus.Sixty-four isolated rat hearts were randomly divided into 4 groups (n =16 each) using a random number table:control group (group C),Ⅰ/R group,ischemic postconditioning group (group IPO) and 5-hydroxydecanoate (5-HD) plus ischemic postconditioning group (group 5-HD + IPO).After 20 min of equilibration,the hearts were continuously perfused with K-H solution for 70 min in group C.In Ⅰ/R group,after 20 min of equilibration,the hearts were continuously perfused with 4 ℃ ST.Thomas cardioplegic solution 10 ml/kg,and exposed to 40 min of ischemia followed by reperfusion with oxygenated K-H solution at 37 ℃ for 30 min.In group IPO,after 20 min of equilibration,the hearts were subjected to 6 cycles of 10 s reperfusion followed by 10 s ischemia starting from 40 min of ischemia,and then were reperfused with oxygenated K-H solution at 37 ℃ for 28 min.In group 5-HD + IPO,after 20 min of equilibration,the hearts were perfused with K-H solution containing 100 μmol/L 5-HD (mitochondrial ATP-sensitive potassium channel blocker) for 5 min starting from 40 min of ischemia,and then the other procedures were similar to those previously described in group IPO.At 20 min of equilibration (T1) and 30 min of reperfusion (T2),HR,left ventricular developed pressure (LVDP),left ventricular end-diastolic pressure (LVEDP) and coronary flow (CF) were recorded.The coronary effluent 2 ml was collected for detection of lactic dehydrogenase (LDH) and creatine kinase (CK) activities.The mitochondria were extracted for determination of cardiolipin content.Results HR,LVDP,and CF were significantly lower,LVEDP was higher,and the LDH and CK activities in coronary effluent were higher at T2 than at T1 in the four groups.Compared with group C,HR,LVDP and CF were significantly decreased,LVEDP was increased,and the LDH and CK activities in coronary effluent were increased at T2 in the other three groups.Compared with Ⅰ/R group,HR,LVDP and CF were significantly increased,LVEDP was decreased,and the LDH and CK activities in coronary effluent were decreased at T2 in IPO group.Compared with IPO group,HR,LVDP and CF were significantly decreased,LVEDP was increased,and the LDH and CK activities in coronary effluent were increased at T2 in 5-HD+IPO group.Conclusion The mechanism by which ischemic postconditioning reduces myocardial Ⅰ/R injury is related to opening of mitochondrial ATP sensitive potassium channels and increasing mitochondrial cardiolipin synthesis in rats.

ObjectiveTo compare the efficacies between conventional acupuncture plus acupoint application and conventional acupuncture plus TDP in treating dysmenorrhea due to blood stagnation led by cold.MethodSixty patients were randomized into two groups, 31 cases in the treatment group and 29 cases in the control group. The treatment group was intervened by conventional acupuncture plus acupoint application, while the control group was by conventional acupuncture plus TDP. Before and after the intervention, McGill Pain Questionnaire was adopted to compare the Pain Rating Index (PRI) score, Visual Analogue Scale (VAS) score, and Present Pain Index (PPI) score, and the therapeutic efficacy was also compared.ResultThe recovery rate was 58.1% in the treatment group, significantly higher than 24.1% in the control group (P<0.01); the total effective rate was 90.3% in the treatment group, significantly higher than 62.1% in the control group (P<0.01), indicating that the therapeutic efficacy of the treatment group was more significant than that of the control group. Before the intervention, there were no significant differences in comparing the PRI, VAS, and PPI scores between the two groups (P>0.05), suggesting the comparability. After the intervention, there were significant differences in comparing the PRI, VAS, and PPI scores between the two groups (P<0.05), and the PRI, VAS, and PPI scores were markedly decreased in the treatment group.ConclusionConventional acupuncture plus acupoint application can improve dysmenorrhea symptoms and reduce patient’s pain, and can produce a more significant efficacy compared with conventional acupuncture plus TDP.

Purpose To explore the reason which resulted in the flow-empty area in carotid artery, establishing a logistic regression model of carotid artery by power Doppler ultrasound, screening the risk factors of the occurrence of this phenomenon and analyzing their reasons. Materials and Methods Clinical data of 172 male subjects who had undergone power Doppler ultrasound were analyzed retrospectively, whether there was flow-empty area at the edge of carotid artery lumen during diastole was observed, brachial artery systolic pressure, diastolic pressure and pressure difference, carotid artery intima media thickness, and the existence of atherosclerotic plaques was measured, the age, body mass index (BMI), blood glucose, blood lipid, history of smoking and cerebrovascular accident situation was collected to establish the logistic model to analyze the risk factors resulted in flow-empty area. Results Among the 172 patients, intima media thickened in 89 cases, systolic blood pressure increased in 97 cases, diastolic blood pressure increased in 7 cases, the pulse pressure increased in 90 cases, with the age of 65 years or older in 92 cases, atherosclerotic plaque formation in 84 cases, long smoking history in 63 cases, cerebral vascular accident history in 11 cases, diabetes mellitus in 79 cases, hyperlipidemia in 101 cases, and abnormal BMI in 13 cases. Doppler energy imaging showed flow-empty area wave type in 98 cases, no flow-empty area wave type in 74 cases. 5 statistically significant variables for the occurrence of flow-empty area in carotid artery lumen during diastole were selected using logistic regression, which were carotid artery intima media thickness, BASP, the pressure difference of brachial artery, existence of atherosclerotic plaque, and the age of patients (OR=50.643, 47.248, 29.426, 32.667 and 20.514, P<0.05). Conclusion The risk factors resulted in flow-empty area in carotid artery are increased IMT, systolic BP and pressure difference, existence of atherosclerotic plaque and the age of 65 years or older. The flow-empty area provides hemodynamic information for the diagnosis of atherosclerosis, and it also plays a helping role in evaluating the degree of arteriosclerosis.

Objective To investigate the effects of diazoxide postconditioning on myocardial ischemiareperfusion (I/R) injury in isolated rat hearts. Methods Male SD rats weighing 250-300 g were anesthetized with intraperitoneal pentobarbital 40 mg/kg. Their hearts were excised and perfused in a Langendorff apparatus with K-H solution saturated with 95% O2-5% CO2 at 37 ℃. Sixty-four isolated rat hearts were randomized into 4 groups after 20 min of equilibration (n = 16 each): group control (group C), group I/R, group diazoxide postconditioning (group D) and group mito-KATP channel blocker 5-hydroxydecanoate (5-HD) + diazoxide postconditioning (group 5-HD + D). Group C received continuous perfusion for another 70 min. In group I/R, D and 5-HD + D, the hearts underwent 40 min of iscbemia followed by 30 min of reperfusion. 4 ℃ ST. Thomas cardioplegic solution was administered prior to ischemia in group I/R. Group D received 5 min of perfusion with K-H solution containing 50μ mol/L diazoxide at 5 min of reperfusion. Group 5-HD + D received 5 min of perfusion with K-H solution containing 50 μmol/L 5-HD before reperfusion with diazoxide. Eight hearts were taken at the end of equilibration and reperfusion and the indexes of cardiac function were recorded. Then the mitochondria were extracted for determination of mitochondrial membrane potential (MMP), reactive oxygen species (ROS) release, and respiratory function indexes. Results Compared with group C, MMP was significantly decreased, ROS release was significantly increased, mitochondrial respiratory function and cardiac function declined at the end of reperfusion in the other three groups ( P ＜ 0.05 or 0.01 ). MMP was significantly increased, ROS release was significantly decreased, mitochondrial respiratory function and cardiac function were improved in group D compared with group I/R and 5-HD + D.Conclusion Diazoxide postconditioning can reduce myocardial I/R injury in rats via the opening of mito-KATPchannels and improving the mitochondrial function.

AIM: To study the protective effect of hyperpolarized cardioplegic arrest on reperfused rat heart performance and to investigate the role of mitochondrial ATP-sensitive K+ channels(mitoKATP) opening in the protection of hyperpolarized cardioplegia against ischemia/reperfusion damage.METHODS: Forty Sprague-Dawley rats were randomized into five groups(n=8 in each group): control group(Con);depolarized arrest group(D);hyperpolarized arrest group(H);depolarized cardioplegia with 5-hydroxydecanoate(5-HD) group(5HD+D);hyperpolarized cardioplegia with 5-HD group(5HD+H).The rat hearts were quickly removed to Langendorff apparatus.The heart perfusion was performed for 20 min with 37 ℃ Krebs-Henseleit buffer balanced with gas mixture(O2∶CO2=95%∶5%) at 5.8 kPa perfusion pressure,then cardial arrest was induced by different cardioplegic solution.Hearts were subjected to ischemia at 37 ℃ for 40 min followed by 30 min reperfusion.(1) The hemodynamics was detected at recovery after 30 min reperfusion.(2) Before ischemia and at the end-reperfusion,tissue was harvested for mitochondrial isolation and ultrastructure was observed by transmission electron microscopy(TEM).(3) Production of reactive oxygen species(ROS) was also determined at different time points.RESULTS:(1) Compared with end-equilibration,30 min reperfusion caused significant differences in left ventricular developed pressure(LADP),left ventricular end-diastolic pressure(LVEDP),double product(DP),heart rate (HR),coronary flow(CF)(P

Objective To evaluate the myocardial protective effects of pinacidil combined with pyrrolidine dithiocarbamate (PDTC) against ischemia-reperfusion (I/R) injury to the isolated rabbit hearts and investigate its mechanisms. Methods One-hundred and twelve Japanese long-ear white rabbits of both sexes weighing 1.8-8.2 kg were killed by a knock to the head after heparinization. Their hearts were immediately removed and mounted on Langendorff apparatus and perfused with oxygenated K-H solution at 371 . Of the 112 isolated hearts 96 were randomized into 6 groups with 16 hearts in each group of which 8 hearts underwent 60 min reperfusion and another 8 hearts 120min reperfusion after 40min global myocardial ischemia: the hearts were perfused with K-H solution in group Ⅰ(K); with St Thomas Ⅱ solution in group Ⅱ(S); with pinacidil in group Ⅲ(P); with PDTC + K-H solution in group Ⅳ(PK); with PDTC + St Thomas Ⅱ solution in group Ⅴ(PS) and with PDTC + pinacidil in group Ⅵ(PP) . The rest of the 112 hearts (16 hearts) were perfused with K-H solution for 10 min. Then myocardial tissue was obtained for immuno-histochemical examination (SABC staining) used as normal control value.(1) Time of resumption of heart beat (from the beginning of reperfusion to the resumption of heart beat) was recorded; (2) left ventricular systolic and end-diastolic pressure (LVSP, LVEDP) and + dp/dtmax were monitored; (3) effluent from coronary sinus was collected at 60 min of reperfusion for determination of TNF-? concentration and (4) myocardial tissue was obtained at the end of reperfusion for determination of expression of NF-?B p65 and ICAM-1 in myocardium. Results (1) The heart beat resumption time was significantly shorter in group PP, PS and P than in the other 3 groups (P

Objective To investigate the effects of pyrrolidine dithiocarbamate (PDTC) on plasma concentrations of proinflammatory cytokines and myocardial energy metabolism induced by cardiopulmonary bypass (CPB) .Methods Twelve healthy mongrel dogs of both sexes weighing 13.5-17.5 kg were randomly divided into 2 groups (n = 6 in each group) : PDTC group and control group. The animals were anesthetized with intraperitoneal 2.5% pentobarbital sodium 25 mg?kg-1, intubated and mechanically ventilated. In PDTC group PDTC 30 mg?kg-1 was given i.v. after tracheal intubation while in control group normal saline was given instead of PDTC. Aorta was clamped for 60 min and then undamped for 60 min reperfusion during CPB. Blood samples were taken before (baseline), 30 and 60 min after aortic clamping and 30 and 60 min after aortic unclamping for determination of plasma concentrations of TNF-? and IL-1?. Myocardial tissue was obtained before and 60 min after aortic clamping and 60 min after aortic unclamping for determination of myocardial content of adenine nucleotide (ATP, ADP, AMP, TAN, EC) and expression of ICAM-1 protein.Results Plasma TNF-? concentration was increased after aortic cross-clamping as compared to the baseline value before clamping in both groups but the TNF-? concentration was significantly lower in PDTC group than in control group (P