Objective To observe the changes of brain natriuretic peptide(BNP)in patients with myocardial infarction,and to assess the clinical value of BNP in the patients with myocardial infarction.Methods BNP was determined in 91 patients with myocardial infarction and in 90 normal cases,and the difference was studied between the area of myocardial infarction and the number of coronary arteries stenosis.Results BNP(ng/L)(155.03 ± 113.45,71.03 ±37.01)and LVEDd(cm)(5.11 ±0.51,4.56 ±0.43)were significantly increased in patients with myocardial infarction than that in normal cases(P＜0.01),but EF(%)(50.84 ±7.98,57.09 ±6.29)was lower than that in normal cases(P＜0.01).BNP and LVEDd were also significantly higher in patients with wide-anterior myocardial infarction than that in antero-septal,inferior and posterior wall myocardial infarction,but LVEF was lower.Conclusion The BNP level was higher in patients with myocardial infarction,especially in patients with wide-anterior myocardial infarction.BNP was a reliable bio-chemical marker which can evaluate the degree and prognosis of patients with myocardial infarction.

Objective To study the effects of ischemia postconditioning(IPC) in reducing ischemia-reperfusion injury(IRI) in acute limp ischemia(ALI) and investigate the mechanism.Methods 45 New Zealand rabbits were treated with the method that combined high lipid diets and femoral intima injury by balloon inflation to build up limp atherosclerotic stenosis model,then they were randomly divided into three groups( each group 15 rabbits):control group;IR group and IPC group.Serum creatine phosphate kinase(CK),malondialehyde(MDA),superoxide dismutase (SOD) in three groups were measured before occlusion and 2 hours after sustaining reperfusion.The histological changes of limp skeletal muscle of experimental rabbits were analyzed and TUNEL method was used to access apoptosis of skeletal muscle cells.Results The levels of CK,M DA in IPC group were lower than IR group [ (7.49 ± 0.84)vs (8.19 ± 1.06),P＜0.05],[ (3.67 ±0.36) vs (4.06 ±0.55),P ＜0.05] while SOD level was higher than IR group [ (420.40 ± 30.94 ) vs ( 384.73 ± 44.12),P ＜ 0.05 ] ; The injury of skeletal muscles in I PC group was lighter than IR group and the apoptosis index of skeletal muscle cells was significantly decreased compared with that in IR group[(12.27+2.11)％ vs (16.62 ± 1.44)％,P＜0.01].Conclusion Applying IPC in acute limp ischemia could alleviate IRI and protect skeletal muscles.The mechanism was associated with oxidation resistance enhancing and the effects in reducing apoptosis of skeletal muscles induced by IRI.

Objective To investigate the predictive value of serum aldosterone and Plasminogen activator inhibitor-1 ( PAI-1 ) levels to the severity of coronary artery lesions and the recent prognosis in acute coronary syndrome (ACS) patients underwent percutaneous coronary intervention(PCI). Methods The study included 160 consecutive patients admitted. All the patients received coronary angiography and were divided into two groups:control group and ACS group. The patients' blood samples were abtained at the root of aortic artery to measure the serum aldosterone and PAI-1 levels. We analyzed their relationship with the severity of coronary artery lesions. The patients were also divided into three groups( high-score group, moderate-score group,low-score group)according to Gensini accumulated points,we analyzed the difference of aldosterone and PAI-1 levels in three groups. The predictive values of aldosterone and PAI-1 to the recent pronosis of ACS patients underwent PCIwere assessed. Results ( 1 )The patients' serum aldosteeone and PAI-1 levels in ACS group were significantly higher than control group( all P <0. 05 ) ;(2)The aldosterone and PAI-1 levels in high-score group were higher than moderate-score group, and moderate-score group was higher than low-score group. (3)The serum aldosterone level in ACS patients was positively correlated with the PAI-1 level ( r = 0.213, all P < 0. 05 ). ( 4 ) Multiple factor Logistic regression analysis indicated that aldosterone, PAI-1 levels were srtong independent predictors for the recent prognosis of ACS patients underwent PCI. Conclusion The aldosterone ,PAI-1 levels in ACS patients were correlated with the severity of coronary artery lesions. Both of them were strong predictors for the recent prognosis of ACS patients underwent PCI.

Objective To investigate the effect and mechanism of ischemic postconditioning (IPC) on myocardial perfusion levels of acute ST-segment elevation myocardial infarction (STEMI) patients having underwent primary percutaneous coronary intervention (PCI), and the safety of IPC. Methods One hundred and sixty patients with STEMI were enrolled, and they accepted the primary PCI therapy within the onset of 12 h. The patients were divided into 2 groups according the treatment method:control group (routine PCI group, 82 cases) and IPC group (78 cases). The ST-segment resolution, TIMI myocardial perfusion grade (TMPG), before and after PCI levels of nitrogen monoxidum (NO), endothelin (ET)-1, tissue-type plasminogen activator (t-PA), plasminogen activator inhibitor (PAI)-1, rate of intraoperative complication were observed. The patients were followed up for 6 months, the rate of major adverse cardiac event (MACE) was recorded. Results The rates of ST-segment resolution and TMPG well in IPC group were significantly higher than those in control group:84.62%(66/78) vs. 67.07%(55/82) and 80.77%(63/78) vs. 64.63%(53/82), and the rate of ischemia-reperfusion injury in IPC group was significantly lower than that in control group: 7.69%(6/78) vs. 24.39%(20/82), and there were statistical differences ( P<0.05 or<0.01). The endothelial function and fibrinolysis activity indexes (NO, ET-1, t-PA and PAI-1 levels ) 7 d after PCI in IPC group were significantly better than those in control group: (52.37 ± 3.84) μmol/L vs. (50.95 ±3.85) μmol/L, (75.47 ±3.47) ng/L vs. (76.61 ±3.72) ng/L, (12.96 ±1.25) μg/L vs. (12.52 ±1.23) μg/L, (21.78 ±4.01)μg/L vs. (24.95±7.56)μg/L, and there were statistical differences (P<0.05 or<0.01). There was no statistical difference in the rate of intraoperative complication between 2 groups ( P>0.05). The rate of MACE in IPC group was significantly lower than that in control group:3.85% (3/78) vs. 14.63% (12/82), and there was statistical difference (P<0.05). Conclusions Applying IPC in patients with STEMI having underwent primary PCI is safe and can improve myocardial perfusion levels. The improvement of vessel endothelial function and fibrinolysis activity attained from IPC may be the major mechanism.

Objective To investigate the effects of high dose atovastatin administration on platelet activity and ventricular remodeling of patients with ST-Segment elevation myocardial infarction (STEMI) underwent primary percutaneous coronary intervention (PCI).Methods A total of 260 STEMI patients who hospitalized in our Department of Cardiology from June 2012 to December 2013 was enrolled and randomly divided into two groups:controlled group (n =140) and high dose atorvastatin group (n =120).Indicators of platelet activities including mean platelet volume (MPV),platelet large cell ratio (P-LCR),blood CD62p,and glucose protein Ⅱ b/Ⅲa (PAC-1) were measured before and 48 hours after PCI.TIMI myocardial perfusion grade (TMPG) after PCI was recorded and patients accepted ultrasound cardiogram (UCG) examinations 5 ～7 days after PCI and 6 months after discharge.After PCI,Patients were followed up for 6 months,statin-associated liver impairment,myopath and major adverse cardiac events (MACE) happened during follow-up periods were recorded.Results MPV,P-LCR,CD62p,and PAC-1 in patients of high dose atorvastatin group were less than controlled group and TMPG were better than controlled group [(12.96±1.73)fl vs (14.18 ± 1.86)fl,P ＜0.05;(29.12 ±5.83)％ vs (30.66 ±6.12)％,P ＜ 0.05;(45.36±5.24)％ vs (48.44±4.75)％,P ＜0.01;(74.61 ±5.57)％ vs (78.55±5.78)％,P ＜0.01].Six months after PCI,UCG examination showed that Left ventricular end-diastolic volume (LV-EDV),left ventricular end-systolic volume (LVESV) and left ventricular mass index (LVMI) in high dose group were less than controlled group while the left ventricular ejection fraction (LVEF) was higher than controlled group [(110.46 ±8.86)ml vs (112.61 ±8.5)ml,P ＜0.01;(60.16 ±6.13)ml vs (63.52 ± 5.54)ml,P ＜0.01;(1O1.69±4.35)g/m2 vs (103.96 ±4.17)g/m2,P ＜0.05;(50.08 ±3.78)％ vs (48.47 ± 4.12) ％,P ＜ 0.05].After 6 months of follow-up,the incidence rate of statin-associated liver impairment and myopathe had no significant difference between two groups and Kaplan-Meier survival analysis showed patients of two groups had significantly different cumulative non-events survival rates (91.7％ vs 82.4％,Log rank =4.409,P =O.036).Conclusions Loading dose atorvastatin before PCI combined high maintenance dose after PCI can inhibit platelet activation and improve myocardial perfusion levels of patients with STEMI underwent primary PCI.It also can reduce Left ventricular remodeling and improve patient's prognosis without increasing side effects.

Objective To investigate relationship of microalbuminuria (MAU) and insulin resistance (IR) to severity of coronary lesions in patients with acute coronary syndrome (ACS), and its predictive value for short-term prognosis in then.Methods In total, 162 ACS patients admitted to the department of cardiology, Guangzhou First People's Hospital, Guangzhou, Guangdong province during January 2008 to June 2009 were selected and divided into three groups according to their urine albumin excretion rate (UAER): 54 cases in normal group with UAER less than 20 μg/min, 62 cases in microalbuminuria group with UAER of (20-200)μg/min, and 46 cases in mass-albuminuria group with UAER more than 200 μg/min.Difference in IR (by homeostasis model assessment, HOMA ) and severity of coronary lesions among the three groups was assessed.Effects of baseline MAU and IR on main adverse cardiac events within the recent six months were observed in ACS patients after percutaneous coronary intervention (PCI).Results IR increased and coronary lesions aggravated as UAER increasing in all the three groups of ACS patients (P＜0.05 or P＜0.01).MAU associated with IR, with a coefficient of correlation of 0.366 (P＜0.01).Results of multivariate logistic regression analysis showed that both MAU and IR were strong independent predictors for main adverse cardiac events in ACS patients within six months after PCI.Conclusions MAU and IR associate with severity of coronary lesions in ACS patients, suggesting certain predictive value for main adverse cardiac events in short-term after PCI.

Objective To assess the roles of renalase and renal sympathetic nerve activity in patients with chronic heart failure (CHF). Methods Plasma renin activity (PRA), angiotensinⅠ (AngⅠ), angiotensin Ⅱ(AngⅡ),adrenaline (E), noradrenaline (NE) and renalase were determined in 60 patients with CHF (CHF group) and in 42 healthy cases (control group). Data were compared between patients with mild and serious CHF. Results PRA, E, NE and AngⅠincreased and renalase decreased in CHF group than those in control group. Compared with mild CHF, renalase and left ventricular ejection fraction decreased (P < 0.01, 0.034), while N-terminal pro-B-type natriuretic peptide (NT-proBNP) and PRA significantly increased (P<0.01). Linear correlation analysis showed that renalase was inversely correlated with Log NT-proBNP (r = -0.400, P = 0.002) and Log NE (r=-0.314, P = 0.014). Logistic regression analysis showed that NT-proBNP (OR = 6.963, 95%CI = 1.223 to 39.638), PRA (OR = 3.736, 95%CI = 1.031 to 13.540) and renalase (OR = 0.253, 95%CI = 0.069 to 0.927) were associated with increased NYHA classes. Conclusions PRA would increase while renalase would decrease in patients with CHF. PRA and renalase were correlated to the severity of CHF.

Objective To investigate the effect of renal sympathetic denervation (RSD) on the activity of renalase in dogs with chronic heart failure (CHF).Methods After induced by abdominal aorta constriction,dogs were divided into three groups according to whether they underwent double renal artery ablation:2 dogs in control group,2 dogs in sham-operated group (no renal artery ablation),and 5 dogs in RSD group (renal artery ablation).Plasma noradrenaline (NE),B-type natriuretic peptide (BNP),and renalase were determined in 5 dogs with RSD (RSD group),2 control dogs (control group),and 2 shamoperated dogs (sham-operated group).Results NE,BNP and heart rate were significantly higher and renalase was lower in CHF group than those in control group (all P ＜ 0.05).Compared to the control dogs with CHF,the levels of renalase were significantly increased in 6 weeks after RSD [(1 948.78 ±49.19) ng/ml vs (1 847.35 ±20.72)ng/ml,P =0.029],and NE [(166.30 ±7.68)pg/ml vs (181.29 ±8.57)pg/ml],and BNP [(75.10 ± 5.58)lμg/ml vs (89.79 ± 2.04) μg/ml] were decreased in 8 weeks after RSD (all P ＜ 0.05).An decreased trend of the levels of renalase was observed in 8 weeks than in 6 weeks in CHF dogs after RSD,without significant difference (P ＞ 0.05).Conclusions The activity of renalase in dogs with CHF can be affected by RSD.

Objective To estimate the gene mutation and the protein expression of v-Raf murine sarcoma viral oncogene homolog B1 (BRAF) in esophageal cancer.Methods From February 2014 to September 2015,75 patients with esophageal cancer who received operation were enrolled.Tissues of cancer,adjacent to cancer and far from cancer were taken.The mutation and protein expression of BRAF were detected.The relationship between BRAF protein positive expression and clinical characteristics of patients with esophageal cancer was analyzed.The enumeration data was compared by chi-square test.Results The mutation of exon 11 and exon 15 of gene BRAF was not found in the tissues of esophageal cancer.Among 75 esophageal cancer,a base C or T inserted in the exon 11 was found in five Ⅲb TNM stage cases,and the expression of BRAF at protein level was positive in 46 cases (61.3％).Among 57 tissues adjacent to cancer,nine cases (15.8 ％) was BRAF positive at protein level.Among 75 tissues far from cancer,five(6.7％) was BRAF positive at protein level.The difference among three groups was statistically significant (x2 =61.098,P＜0.05).The positive rates of BRAF expression at protein level in patients with esophageal cancer at Ⅰ,Ⅱ and Ⅲ TNM stage were 21.7％ (5/23),70.8％ (17/24) and 85.7 ％ (24/28),respectively.The positive rates of BRAF expression at protein level in patients with and without lymph node metastasis were 81.6％ (31/38) and 40.5％ (15/37).The positive expression of BRAF at protein level was related with TNM stage and lymph node metastasis (x2 =23.136 and 13.313,both P＜0.01),however it was not related with gender,age and the degree of tumor differentiation (all P＞0.05).Conclusions There is base insertion in the exon 11 of gene BRAF in esophageal cancer,but gene mutation is not found.BRAF is highly expressed in esophageal cancer,which is related with TNM stage and lymph node metastasis,and BRAF could be an indicator of assessment of degree of malignancy and prognosis of esophageal cancer.

Objective To investigate the association of insulin resistance (IR),blood pressure variability (BPV) and the severity of acute coronary syndrome (ACS),and assess the effect of percutaneous coronary intervention (PCI) on recent prognosis.Methods A total of 260 patients diagnosed as ACS and hospitalized in our department of cardiology from December 2009 to December 2010 were enrolled in the study.There were 93 cases of unstable angina pectoris ( UAP),84 of non ST segment elevation myocardial infarction and 83 of unstable angina pectoris.The subjects were divided into two groups according to 24 hour systolic blood pressure coefficient of variability (24 h SBP-CV) levels:high-CV group (24 h SBP-CV ＞11.5,n =130) and low-CV group(24 h SBP-CV ＜ 11.5,n =130).The differences in HOMA-IR and the severity of coronary artery diseases between the two groups were compared.The association of major adverse cardiac events within 6 months after PCI treatment,and IR as well as BPV was analyzed.Results Compared with the low-CV group,ACS patients in the high-CV group had obviously higher HOMA-IR levels (5.7 ± 1.2 vs 4.0 ± 1.4,P ＜0.01 ),more multivessel diseases (49.2％ vs 33.3％,P ＜0.05) and B2/C type coronary diseases (48.5％ vs 27.7％,P ＜0.01 ),and higher coronary Gensini scores (59.7 ± 17.5vs 43.8 ± 18.6,P ＜ 0.01 ).Multi-factors logistic regression analysis indicated that both 24 h BPV-CV and IR were independent predictors for MACE incidence within 6 months after undergone PCI ( P ＜ 0.05 or P ＜0.01 ).Conclusions IR and BPV were obviously associated with the severity of coronary artery diseases in ACS patients.IR and 24 h BPV-CV were valuable in predicting recent prognosis of ACS patients.