Rationale and design for comparison of non-compliant balloon with drug-coating balloon angioplasty for side branch after provisional stenting for patients with true coronary bifurcation lesions: a prospective, multicentre and randomised DCB-BIF trial.

INTRODUCTION: Provisional stenting using drug-eluting stent is effective for simple coronary bifurcation lesions. Kissing balloon inflation using conventional non-compliant balloon is the primary treatment of side branch (SB) after main vessel (MV) stenting. Drug-coating balloon (DCB) is reported to be associated with less frequent clinical events in in-stent restenosis and small vessel disease. The importance of DCB in bifurcation treatment is understudied. Accordingly, this trial is designed to investigate the superiority of DCB to non-compliant balloon angioplasty for SB after provisional stenting in patients with true coronary bifurcation lesions. METHODS AND ANALYSIS: The DCB-BIF trial is a prospective, multicentre, randomised, superiority trial including 784 patients with true coronary bifurcation lesions. Patients will be randomised in a 1:1 fashion to receive either DCB or non-compliant balloon angioplasty if SB diameter stenosis >70% after MV stenting. The primary endpoint is the composite of major adverse cardiac event at the 1-year follow-up, including cardiac death, myocardial infarction (MI) or clinically driven target lesion revascularisation. The major secondary endpoints include all-cause death, periprocedural MI, spontaneous MI, clinically driven target vessel revascularisation, in-stent restenosis, stroke and individual component of the primary endpoint. The safety endpoint is the risk of stent thrombosis. ETHICS AND DISSEMINATION: The study protocol and informed consent have been reviewed and approved by the Institutional Review Board of all participating centres. The written informed consent for participation in the trial will be obtained from all participants. The results of this study will be published in a peer-reviewed journal and disseminated at conferences. TRIAL REGISTRATION NUMBER: NCT04242134.

Estimation of SPAD value in waterlogged winter wheat based on characteristic indices of hyperspectral and digital image.

To explore the optimal monitoring method for soil and plant analyzer development (SPAD) of winter wheat under waterlogging stress based on hyperspectral and digital image techno-logy, the correlations between SPAD of the waterlogged winter wheat and fifteen indices of hyperspectral characteristic and fourteen indices of digital image feature were analyzed under a micro-plot which could be irrigated and drainage separately. Then, the BP neural network models for SPAD estimation were constructed based on the optimal monitoring feature indices. Compared with the normal winter wheat, SPAD and the value of hyperspectral reflectance did not change under short-term waterlogging (less than 7 d), whereas the SPAD was significantly decreased after more than 12 d waterlogging treatment with the value being close to zero at the late stage of growth. The estimation accuracy based on the digital image characteristics of green minus red, excess red index, norma-lized redness index and excess green index showed similar results compared to that using the BP network model based on the characteristics of the corresponding hyperspectral band. The highest R2 between the measured value and the predicted value was 0.86, while the root mean square error (RMSE) was 3.98. Compared with the BP network models built with the digital image feathers, the accuracy of the models based on the four hyperspectral characteristic indices (carotenoid reflex index, yellow edge amplitude, normalized difference vegetation index and structure insensitive pigment index) for SPAD was significantly improved, with the highest R2 of 0.97 and the lowest RMSE of 1.95. Our results suggest that both hyperspectral and digital image technology could be used to estimate SPAD value of waterlogged winter wheat and that the BP network model based on hyperspectral characteristic indices performed better in the estimation accuracy.

Association of serum levels of AngII, KLK1, and ACE/KLK1 polymorphisms with acute myocardial infarction induced by coronary artery stenosis.

INTRODUCTION: The study aims to confirm the association of acute myocardial infarction (AMI) with serum angiotensin II (AngII), kallikrein1 (KLK1), and ACE/KLK1 polymorphisms. MATERIALS AND METHODS: Serum AngII/KLK1 levels and ACE and KLK1 genotypes were determined in 208 patients with AMI and 216 normal controls. Binary logistic regression was used for data analysis. RESULTS: The differences in serum AngII levels were statistically significant between the groups. After adjusting for potential confounding factors, high serum levels of AngII and KLK1 significantly increased the risk of AMI. The individuals with ACE DD and KLK1 GG genotypes significantly increased the risk of AMI compared with those harboring the ACE II and KLK1 AA genotypes (OR = 8.77, 95% CI = 1.74-44.16). CONCLUSIONS: (1) Increasing the serum levels of AngII increased the risk of AMI. (2) The risk of AMI increased significantly when the serum levels of AngII and KLK1 simultaneously increased. (3) Individuals with the combined genotypes of ACE DD and KLK1 GG showed significantly increased risk of AMI compared with those with the combined genotypes of ACE II and KLK1 AA.

Circulating CD36 and fractalkine levels are associated with vulnerable plaque progression in patients with unstable angina pectoris.

The chemokine, fractalkine, independently enhances the vulnerability of coronary atherosclerotic plaques. The present study investigated the combined effects of CD36 and fractalkine on coronary plaque progression in patients with unstable angina pectoris. In the present study, 120 unstable angina pectoris patients undergoing coronary angiography and intravascular ultrasound were divided into two groups: an intermediate lesion group (lumen diameter stenosis 50-70%, 80 patients) and a severe lesion group (at least one lesion with lumen diameter stenosis > 70%, 40 patients). The control group consisted of 40 healthy age- and sex-matched subjects. Concentrations of CD36 and fractalkine were measured by enzyme-linked immunosorbent assay. Major adverse cardiovascular events were monitored over a 2-year follow up. Intravascular ultrasound showed that patients with severe lesions had more calcified and mixed plaques, and a larger plaque area and plaque burden than patients with intermediate lesions (P < 0.05-0.01). More patients with severe lesions underwent stent deployment (P < 0.05) than those with intermediate lesions. CD36 and fractalkine concentrations were significantly higher in the severe lesion patients (P < 0.05), and both had significant positive correlations (P < 0.05) with the plaque burden of atherosclerotic lesions. Using the matched nested case-control study, we found that CD36 and fractalkine levels were higher in patients with recurrent major adverse cardiovascular events than controls (P < 0.05). In conclusion, CD36 and fractalkine both promote, and might synergistically enhance, the progression of coronary atherosclerotic plaques.

Autophagy of monocytes attenuates the vulnerability of coronary atherosclerotic plaques.

OBJECTIVE: The aim of this study was to determine whether autophagy of monocytes attenuates the vulnerability of atherosclerotic plaques. METHODS: The study group comprised 50 patients with stable angina pectoris (SAP), 50 patients with unstable angina pectoris (UAP), 40 patients with acute myocardial infarction (AMI), and 30 patients without coronary artery disease (control). Peripheral blood monocytes (PBMs) were isolated and the expression levels of the proteins beclin-1 and light chain 3 (LC3) (autophagy-specific proteins) in the PBMs were analyzed by western blot. A laser scanning confocal microscope was used to determine the levels of LC3 in the PBMs. RESULTS: Western blot analysis revealed that the expression of beclin-1 and LC3 was significantly lower in acute coronary syndrome patients than in the SAP and control groups (P<0.05). Among the acute coronary syndrome patients, the expression level of beclin-1 and LC3 in the AMI group was significantly decreased compared with that in the UAP group (P<0.05). However, there was no statistical difference between the SAP group and the control group. The results of immunofluorescence assays showed that the fluorescence intensity of LC3 in the PBMs of AMI patients was significantly lower than that in those of UAP patients (P<0.05), which was also significantly decreased compared with that in those of SAP patients and the control group (P<0.05). Expression levels of beclin 1 in the UAP and AMI groups had a negative linear correlation with C-reactive protein levels (r=-0.531, P<0.05; r=-0.589, P<0.05, respectively). CONCLUSION: Autophagy of PBMs is involved in the pathogenesis of plaque vulnerability and subsequent plaque rupture. Enhancing the autophagy of PBMs may be a new therapeutic target for stabilizing atherosclerotic plaques.

The correlation between carotid-femoral pulse wave velocity and composition of the aortic media in CAD patients with or without hypertension.

OBJECTIVES: To investigate the influence of hypertension on large artery elasticity and the microstructure of the ascending aortic media in patients with coronary artery disease (CAD), and the association between arterial compliance and composition of the ascending aorta. METHODS: 60 patients with CAD who underwent coronary artery bypass graft surgery were divided into two groups: 30 patients in a hypertension group and 30 patients in a non-hypertension group. Carotid-femoral pulse wave velocity (cfPWV) was measured by an automatic device (Complior, Artech, France). The severity of coronary atherosclerosis was assessed after selective coronary angiography using the Gensini score system. A quantitative study was conducted on ascending aorta specimens by histological and computer image analysis. RESULTS: cfPWV of the hypertension group was higher than that of the non-hypertension group. The relative content of collagen in the ascending aortic media of the hypertension group was higher than that of the non-hypertension group, while the relative content of elastin in the ascending aortic media of the hypertension group was lower than that of the non-hypertension group. cfPWV showed a positive correlation with relative contents of collagen in the ascending aorta and a negative correlation with relative contents of elastin in the ascending aorta in the two groups. CONCLUSIONS: Hypertension may raise the contents of collagen and decrease the contents of elastin in the ascending aortic media of patients with CAD, which in turn may decrease the patients' large artery compliance. cfPWV may reflect the quantitative changes of collagen and elastin in the ascending aortic media in CAD patients independently of hypertension.

Combination of raloxifene, aspirin and estrogen as novel paradigm of hormone replacement therapy in rabbit model of menopause.

AIM: To assess a novel hormone replacement therapy (HRT) paradigm using raloxifene, aspirin combined with estrogen in rabbit model of menopause. METHODS: Female New Zealand white rabbits were ovariectomized or sham-operated. The ovariectomized rabbits were divided into 7 groups: estradiol valerate (E(2)), raloxifene, aspirin, E(2) /raloxifene, E(2)/aspirin, E(2) /raloxifene/aspirin and vehicle. Two weeks after the operation, the rabbits were administered the above drugs for 12 weeks. Then, the mammary glands were examined histologically, uterus was weighted, and blood sample was collected for analyzing the levels of estrogen, serum lipids and monocyte chemoattractant protein (MCP)-1, and platelet aggregation. The aortic tissue was examined morphometrically. RESULTS: Compared with E(2) 0.1 mg·kg(-1)·d(-1) treatment alone, the pairing of raloxifene 10 mg·kg(-1)·d(-1) with E(2) significantly decreased the extent of mammary gland branches and ducts (5.53%±1.23% vs 15.4%±2.17%, P<0.01), as well as the uterine weight (2.16±0.35 g vs 4.91±0.75 g, P<0.01). However, E(2)/raloxifene or E(2) alone treatment significantly stimulated platelet aggregation relative to vehicle group. Addition of aspirin 5 mg·kg(-1)·d(-1) reduced platelet aggregation to almost the same level as the vehicle group. E(2) treatment exerted a positive effect on serum lipids and MCP-1, and a regression in aortic intimal plaque size compared to the vehicle. Raloxifene reinforced the positive effects of E(2). CONCLUSION: The combination of raloxifene, aspirin and E(2) exhibits positive lipid, MCP-1 and atherosclerotic responses with minimal stimulation of breast and uterine tissues as well as platelet aggregation in a rabbit model of the menopause.

Atherosclerotic plaque components characterization and macrophage infiltration identification by intravascular ultrasound elastography based on b-mode analysis: validation in vivo.

Intravascular ultrasound elastography (IVUSE) is a promising imaging technique for early investigation of vulnerable plaques. Compared to radiofrequency signal processing, digital B-mode analysis is simple and of higher portability. However, rare studies have been reported validating the latter technique in vivo. In this study, we developed an IVUSE computer software system involving semi-automatic border delineation and block-matching algorithm and validated the system in vivo. Seven minipigs were fed with atherogenic diet for 40 weeks. For each pig, the endothelium of one side of the renal arteries was denuded at the fifth week. With cross-correlation analysis, Lagrangian strain was calculated from two intravascular ultrasound images acquired in situ. Sixty regions of interests were selected from 35 elastograms matched well with the corresponding histological slices. Plaque types within these regions were classified as fibrous, fibro-fatty or fatty on Masson's trichrome and Oil-red O staining. Macrophage infiltration was also evaluated with immunohistology. Comparison between the mean strain value of the region of interest and the histological results revealed significant differences in strain values among different plaque types and non-diseased artery walls. The extent of macrophage infiltration was found to be correlated positively with strain values. For identification of fibro-fatty and fibrous plaques and macrophage infiltration, the system showed high sensitivity (93, 96 and 92%, respectively) and specificity (89, 76 and 66%, respectively), as revealed by receiver operating characteristic analysis. Our IVUSE system based on B-mode analysis is capable of characterizing fibrous and fibro-fatty plaques and macrophage intensity, thus holds potential for identifying vulnerable plaque.

[Roles of monocyte chemoattractant protein-1, RANTES and Fractalkine on promoting vulnerability of atherosclerotic plaques].

OBJECTIVE: To elucidate the roles of monocyte chemotactic factors (MCP-1, RANTES and Fractalkine) on the vulnerability of atherosclerotic plaques in patients with stable (SAP) and unstable angina pectoris (UAP). METHODS: Patients with SAP (n = 50) and UAP (n = 50) underwent coronary angiography (CAG) and intravenous ultrasound (IVUS) were included in the study. Monocyte chemotaxis was assayed by the transwell chamber. Concentrations of hs-CRP, MCP-1, RANTES and Fractalkine were measured by Enzyme-linked-immunosorbent assay (ELISA). mRNA expression of MCP-1, RANTES and Fractalkine in the monocytes was detected by RT-PCR. RESULTS: IVUS evidenced soft lipid plaques in 48% UAP patients and in 16% SAP patients (P < 0.05). SAP patients had mainly fibrous and mixed plaques. Plaque burden and vascular remodeling index were significantly higher in UAP patients than in SAP patients (P < 0.01). The averaged number of migrated monocytes in the UAP patients were higher than that in patients with SAP (P < 0.01). Concentration of hs-CRP, MCP-1, RANTES and Fractalkine were significantly higher in UAP patients than those of SAP patients (P < 0.05 or P < 0.01). mRNA expression of MCP-1, RANTES and Fractalkine in patients with UAP was significantly higher than those of SAP patients (P < 0.05). CONCLUSION: Upregulated monocyte chemotactic factors (MCP-1, RANTES and Fractalkine) might promote coronary plaque vulnerability in UAP patients.

[The correlation of human serum Lp-PLA2 and hs-CRP and stability of coronary atherosclerotic plaques].

OBJECTIVE: To explore the relationship of serum lipoprotein-associated phospholipase A2 and high sensitive C-reactive protein in vulnerable coronary atherosclerotic plaques. METHODS: Patients undergoing coronary angiography (CAG) were examined for CAD with intravascular ultrasound (IVUS). According to the findings of CAG and IVUS, all the patients were divided into three groups: a control group without plaque, stable plaque group and vulnerable plaque group. The total serum Lp-PLA2 and hs-CRP were measured before angiography and they were valued with T test and Pearson's correlation analysis. RESULTS: (1) Lp-PLA2 level in stable plaque group and vulnerable plaque group was higher than that in control group (P < 0.05). (2) Lp-PLA2 level in the vulnerable plaque group was higher than that in stable plaque group (P < 0.05). (3) hs-CRP level in the vulnerable plaque group is higher than that in the stable plaque group and control group (P < 0.05) and there was significant difference between them. (4) To discriminate vulnerable plaque, the specificity of serum Lp-PLA2 was stronger than that of hs-CRP. CONCLUSIONS: Serum Lp-PLA2 level has higher sensitivity in predicting the vulnerability of the coronary atherosclerotic plaque than hs-CRP. In combination with hs-CRP, we can use Lp-PLA2 as a new biomarker to predict the presence of vulnerable plaque.

Value of left ventricular regional ejection fraction determined by real-time three-dimensional echocardiography in diagnosis of aneurysm: compared with left ventriculography.

BACKGROUND: Regional ejection fraction (EF(R)) measured by real-time three-dimensional echocardiography (RT-3DE) provides a novel method for quantifying left-ventricular (LV) regional systolic function. We aimed to explore the diagnostic value of regional ejection fraction (EFR) derived from RT-3DE in detecting LV aneurysms in patients with myocardial infarction. METHODS: Thirty-eight patients with myocardial infarction were prospectively enrolled and underwent electrocardiography (ECG), two-dimensional echocardiography (2-DE), RT-3DE and left ventriculography (LVG). Subjects with a negative EFR in at least one segment on RT-3DE were considered as having a ventricular aneurysm. We compared the sensitivity, specificity, Youden's index, and positive and negative predictive values of ECG, 2-DE and RT-3DE in determining LV aneurysm with detection by LVG. RESULTS: On LVG an LV aneurysm was diagnosed in 16 (42.1%) patients. The sensitivity and specificity were 62.5% and 86.4% for ECG, 81.2% and 95.4% for 2-DE, and 100.0% and 90.9% for RT-3DE in diagnosing LV aneurysm. Youden's indexes for ECG, 2-DE and RT-3DE were 0.49, 0.77 and 0.91, respectively. Positive and negative predictive values were 76.9% and 76.0% for ECG, 92.9% and 87.5% for 2-DE, and 88.9% and 100.0% for RT-3DE. CONCLUSIONS: RT-3DE-derived EFR provides a novel, reliable index in the diagnosis of LV aneurysm and has excellent sensitivity and specificity.

Safety and efficacy of transcatheter closure of atrial septal defects guided by transthoracic echocardiography: a prospective study from two Chinese Medical Centers.

The purpose of this study was to evaluate the safety and efficacy of transcatheter atrial septal defect (ASD) closure guided by transthoracic echocardiography (TTE). A total of 191 patients with ASD were recruited from two Chinese medical centers and TTE was carefully performed in multiple views to observe ASD number, position, diameter and relation with adjacent cardiac structures. All patients were divided into three groups based on their largest ASD diameters: 66 subjects with ASD diameter 5-14 mm (group A); 60 subjects with ASD diameter 15-20 mm (group B); and 65 subjects with ASD diameter 21-38 mm (group C). Atrial septal occluders (ASOs) were successfully deployed in 188 patients (98.4%) and ASD was successfully closed at 6-mo follow-up in 185 patients (96.9%). The difference between diameters of ASO and ASD (ASO-ASD) in groups A, B and C were 3.9 +/- 2.4 (0-7) mm, 5.0 +/- 2.6 (3-8) mm and 6.2 +/- 3.8 (5-11) mm, respectively. In group A, no complications occurred. In group B, only four patients had mild complications such as sinus bradycardia, transient hematuria and migraine, all of which disappeared after treatment. In group C, one patient developed ASO migration into the right atrium and two patients had their ASO migrated into the right ventricular outflow tract. Immediately after the closure, 60 (90.9%), 53 (88.3%) and 53 (82.8%) patients had complete ASD closure; 2, 4 and 6 patients had trivial residual shunts; 4, 3 and 2 patients had small residual shunts; and 0, 0 and 2 patients had moderate residual shunts in groups A, B and C, respectively. Most of the residual shunts were persistent at 6-mo follow-up. No embolism or death at procedure and 6-mo follow-up occurred. In conclusion, TTE is a reliable technique for measurement of ASD diameter, guidance of transcatheter ASD closure and evaluation of residual shunts. Transcatheter ASD closure guided by TTE is safe and effective, especially in patients with ASD

Reliability of transthoracic echocardiography in estimating the size of Amplatzer septal occluder and guiding percutaneous closure of atrial septal defects.

BACKGROUND: In China, transthoracic echocardiography (TTE) is popularly used for pre-intervention examination for atrial septal defect (ASD) and for guiding ASD closure. However, the ability to determine ASD size and the safety and efficacy of TTE for guiding ASD closure still has not been widely accepted. This study aimed to evaluate the efficacy and safety of TTE used before, during and after transcatheter ASD closure with Amplatzer septal occluders (ASO). METHODS: Sixty-eight subjects (15 men and 53 women; mean age (33.7 +/- 17.3) years) were enrolled. TTE was used to measure the diameters and guide transcatheter closure of ASD. The ASD was examined by long-axis view, basal short-axis view, apical four-chamber view and the subcostal view to observe position, diameter and relation with neighbouring structures. The largest diameter was selected as the reference diameter. Patients were divided into 3 groups according to the ASD reference diameter: 22 subjects with ASD diameter 4 - 14 mm (group A); 21 subjects with ASD diameter 15 - 20 mm (group B); and 25 subjects with ASD diameter 21 - 33 mm (group C). RESULTS: ASD was occluded successfully in groups A and B. In group C, occlusion failed in 2 cases; 1 case remained with a 3-mm residual shunt sustained until 6-month follow-up. However, at 6-month follow-up, no case of thromboembolism, ASO dislocation or death occurred in the three groups. The diameter of ASD measured by TTE could accurately predict the ASO size that could successfully occlude the ASD, especially in patients with ASD < 20 mm. The ASD diameter measured by TTE correlated well with ASO size (r = 0.925, P < 0.001; r = 0.976, P < 0.001; r = 0.929, P < 0.001 respectively). CONCLUSIONS: ASD diameter measured by TTE can accurately estimate the size of the ASO needed for successful closure of ASD. The larger the ASD, the much larger the ASO needed. TTE is a satisfactory guiding imaging tool for ASD closure.

Multivessel percutaneous coronary intervention in Chinese patients with acute myocardial infarction and simple nonculprit arteries.

BACKGROUND: Multivessel percutaneous coronary intervention (PCI) for patients during acute myocardial infarction (AMI) is currently controversial. In this study, we investigated the significance of multivessel PCI in Chinese patients with ST-segment elevation AMI and relatively simple lesions in nonculprit arteries. METHODS: We reviewed all consecutive primary PCI of ST-segment elevation AMI in our hospital between 2002 and 2005. The patients with multivessel disease and ACC/AHA type A/B1 lesions in nonculprit arteries who underwent multivessel PCI were identified (n = 105, multivessel PCI group), and 120 patients with single-vessel disease and treatment with primary PCI were enrolled as control subjects (single-vessel PCI group). The primary end points were the occurrences of 6-month major adverse cardiac events (cardiogenic death, nonfatal reinfarction, and target vessel revascularization). The secondary end points included procedure time, angiographic success rate, TIMI grade, reperfusion arrhythmia, ST-segment resolution, and left ventricular ejection fraction. RESULTS: All patients with multivessel PCI tolerated the operations well and had similar TIMI 3 and angiographic success rates but longer procedure times than those patients with single-vessel PCI. There were no significant differences in reperfusion arrhythmia, ST-segment resolution, left ventricular ejection fraction, or 6-month MACEs between both groups. CONCLUSIONS: This study suggests that multivessel PCI is effective and safe for Chinese patients with ST-segment elevation AMI and simple lesions in nonculprit arteries.

Facilitated PCI in younger Chinese patients with AMI.

Presently, facilitated percutaneous coronary intervention (PCI) in patients remains controversial. We evaluated the efficacy and safety of facilitated PCI, intravenous low-dose rt-PA administration prior to urgent PCI, in Chinese patients < 70 years of age with ST-segment elevation myocardial infarction. Our results suggest that the age and dosage of thrombolytics should be noticed seriously when considering facilitated PCI.

[The role of atherosclerotic plaque stability and inflammation in the pathogenesis of acute coronary syndrome].

OBJECTIVE: To elucidate the effect of inflammation and coronary atherosclerotic plaque destabilization in the pathogenesis of acute coronary syndromes (ACS). METHODS: Twenty-eight patients with ACS and 13 patients with stable angina pectoris (SA) were examined by intravascular ultrasound (IVUS). Coronary plaque morphology and areas in culprit lesions were analyzed. The serum levels of hs-CRP, MMP-9, TIMP-1, sCD40L were also measured. RESULTS: Soft plaques were dominant in culprit lesions of ACS patients (71.4%, 20/28), and hard plaques were dominant in culprit lesions of SA patients [76.9% (10/13), P = 0.004]. At the culprit site, plaque area, plaque burden and remodeling index were all significantly larger in culprit lesions of ACS patients than those of SA patients (all P < 0.05). Positive remodeling was more frequent in ACS patients than in SA patients, whereas negative remodeling was more frequent in SA patients (P < 0.05). The serum levels of hs-CRP, MMP-9, sCD40L were higher in ACS group compared with SA group (P < 0.05, respectively). Moreover, hs-CRP level was positively correlated with MMP-9 (r = 0.671, P = 0.000) and sCD40L (r = 0.494, P = 0.008), respectively, in ACS patients. There was no difference in TIMP-1 between two groups (P = 0.234). CONCLUSIONS: These results suggest that structurally vulnerable plaques are essential element in the pathogenesis of ACS and inflammation might play an important role in plaque vulnerability.

[Changes of neutrophil myeloperoxidase in coronary circulation among patients with acute coronary syndrome].

OBJECTIVE: To investigate the changes of neutrophil myeloperoxidase (MPO) blood concentration gradient between the systemic circulation and the coronary circulation among patients with acute coronary syndrome and its clinical value. METHODS: Fifty patients underwent coronary angiography, which including 10 patients in AMI group, 20 patients in UA group, 10 patients in SA group and 10 subjects served as control. The levels of MPO and hs-CRP were measured in the serum of blood collected from femoral vein, aortic artery root and coronary sinus. RESULTS: Compared with the control, concentrations of LDL in the AMI, UA and SA groups were significantly increased, while the latter three groups did not differ from each other. In the UA patients, the in-gate percentage of MPO decreased in the coronary sinus compared with that in the root of aortic artery (P < 0.01); the in-gate percentage of MPO decreased through coronary circulation more than through systemic circulation (P < 0.001); the average fluorescent intensity of MPO and the concentrations of hs-CRP showed no difference between samples from the coronary sinus and that from the root of aortic artery. In the AMI patients, the average fluorescent intensity of MPO in the coronary sinus was weakened compared with that in the root of aortic artery (P < 0.05); it decreased through coronary circulation more than through systemic circulation (P < 0.001); neither the in-gate percentage of MPO nor the concentrations of hs-CRP showed significant difference between samples from the coronary sinus and that from the root of aortic artery. In the control and SA groups, samples from the femoral vein, the root of aortic artery, and the coronary sinus did not show differences at the serum level of MPO and hs-CRP. In the UA group, the in-gate percentage of MPO correlated positively with the concentration of hs-CRP (r = 0.78, P < 0.01), and with the level of LDL as well (r = 0.52, P < 0.05); In the AMI group, the average fluorescent intensity of MPO correlated negatively with the concentration of hs-CRP (r = -0.80, P < 0.01), and showed no correlation with the level of LDL (r = 0.22, P > 0.05). CONCLUSIONS: MPO is a better marker for inflammation of the local plaques. It may be one of the mechanisms that MPO induces the transforming from LDL to ox-LDL in plaques vulnerability.