Clinical diagnostic value of combined detection of IMA, D‑D and MCP‑1 in acute myocardial infarction
- Authors:
- Published online on: March 2, 2021 https://doi.org/10.3892/etm.2021.9888
- Article Number: 457
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Copyright: © Ding et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Coronary artery disease can cause imbalance between coronary artery blood flow and myocardial demand, leading to myocardial injury, resulting in myocardial ischemia and hypoxia or necrosis, which is clinically known as ‘coronary heart disease’ (CHD). Acute myocardial infarction (AMI) is one of the common manifestations of CHD (1). AMI is a kind of myocardial ischemic necrosis caused by coronary artery occlusion and interruption of blood flow. The clinical manifestations of AMI include persistent post-sternal pain, shock, arrhythmia and even death caused by severe heart failure (2). Early diagnosis and treatment of AMI can significantly reduce the mortality and improve the prognosis of patients (3). According to whether there is ST-segment elevation in the ECG, AMI can be divided into 6 types of infarction: Coronary artery bypass graft-related infarction, coronary stent thrombosis-related infarction, percutaneous coronary intervention-related infarction, infarction leading to sudden death without biomarkers, infarction caused by imbalance between supply and demand in blood flow due to causes other than acute atherosclerotic thrombosis, and infarction caused by coronary atherosclerotic thrombosis (1). Epidemiological surveys show that there are approximately 550,000 new AMI and 200,000 relapsed AMI patients in the United States each year, and the global burden of the disease has begun to shift to low- and middle-income countries (4). Approximately 80% of deaths from cardiovascular diseases come from low- and middle-income countries (4).
Early detection, diagnosis, and treatment are the keys to effectively preventing and reducing the occurrence and death of AMI. Cardiac troponin (cTn) is the first-choice biomarker for AMI detection (2). It has high value in distinguishing unstable angina pectoris, diseases other than acute coronary syndrome and non-ST-segment elevation AMI. The cTn test is highly sensitive to AMI and can improve the sensitivity of diagnosis, but its specificity is low. Its diagnostic performance is affected by diseases such as myocarditis, kidney damage, respiratory failure, and intracranial hemorrhage. Therefore, multi-index combined diagnosis can improve the diagnosis of AMI. Ischemia-modified albumin (ische-mia-modified albumin, IMA) is an ideal ischemia marker. It is the first myocardial ischemia marker approved for sale by the US FDA (5). A previous study has confirmed that when myocardial necrosis indicators are negative, IMA can show extremely high sensitivity. For example, IMA can be detected in the blood within 5-10 min of myocardial ischemia. After it reaches a peak value in 1-2 h, IMA returns to the basic level in 3-6(5). In addition, plasma D-dimer (D-D) and inflammatory cytokine monocyte chemoattractant protein-1 (MCP-1) were detected. As a specific degradation product of cross-linked fibrin, the increase of D-D level reflects the enhancement of secondary fibrinolytic activity, and it can be used as a specific molecular marker for hypercoagulability and fibrinolytic hyperactivity in vivo (6). It has been shown that plasma D-dimer has diagnostic significance in vascular diseases and can be used as one of the auxiliary diagnoses for the determination of AMI (7). MCP-1 is mainly secreted and released by endothelial cells, vascular smooth muscle cells and macrophages. It can induce the expression of certain inflammatory factors, chemokines, matrix metalloproteinases and tissue factors in plaque cells, converting the originally stable plaques into vulnerable plaques, and rupture and secondary thrombosis lead to the occurrence of AMI (8).
The aim of this study was to investigate the application value of the combined detection of IMA, D-D, and MCP-1 for early diagnosis of AMI. The results showed that, the levels of IMA, D-D and MCP-1 were positively correlated with CTnT and hs-CRP levels in AMI patients. Combined detection of IMA, D-D, and MCP-1 can improve the accuracy.
Materials and methods
General information
A total of 87 patients with AMI who met the diagnostic criteria of AHA/ACC (9) from January 2017 to January 2018 were enrolled in the AMI group, including 53 males and 34 females, with the age of 64.35±11.90 years. Another 82 patients who were hospitalized at the same time and confirmed by coronary angiography without coronary artery disease were enrolled in a control group, including 50 males and 32 females, with the age of 59.04±12.13 years. The general data of patients in the two groups were compared, and there was no statistical difference, as detailed in Table I.
The study was approved by the Medical Ethics Committee of the China-Japan Union Hospital of Jilin University, and informed consent was signed by all the selected subjects.
Inclusion and exclusion criteria
Inclusion criteria were: i) Patients with AMI, diagnosed by AHA/ACC diagnostic criteria; ii) age ≥30 years. Exclusion criteria were: i) Patients with severe liver and kidney insufficiency, tumors and rheumatic diseases; ii) acute or chronic infections; iii) trauma and sports injury.
Inspection indicators Determination of serum MCP-1, D-D and IMA content
Fasting venous blood (5 ml) was taken from the selected subjects, and the blood was left to stand for 0.5-1 h at room temperature. The blood was centrifuged at the speed of 650 x g at 4˚C for 10 min. After centrifugation, the upper serum was retained, and the serum levels of MCP-1, D-D and IMA were detected by ELISA. MCP-1 kit was purchased from ADL Company, and D-D kit was purchased from Merck Biotechnology Co., Ltd. (product no.: cx20026, and item no.: 59-20026). IMA kit was purchased from Shanghai Fusheng Industrial Co., Ltd. (cat. no. A097761-48T). The operation procedure was performed in accordance with the kit instructions.
Determination of CTnT, hs-CRP and blood lipids in patients
Fasting venous blood (5 ml) was taken from the selected subjects, and the blood was let stand for 0.5-1 h at room temperature. The blood was centrifuged at the speed of 650 x g at 4˚C for 10 min. After centrifugation, the upper serum was retained, and the serum levels of CTnT and hs-CRP were detected by ELISA. The human CTnT ELISA kit (FKO1147B) was purchased from Shanghai Kexing Biotechnology Co., Ltd., and the human hs-CRP ELISA kit (no. A09718) was purchased from Shanghai Jining Industrial Co., Ltd.. Surgery was performed in accordance with the kit instructions. Total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-D) and low-density lipoprotein cholesterol (LDL-C) were measured in the two groups of patients by AU1000/2700 automatic biochemical analyzer.
Prognosis
Conventional treatment was performed on all patients with AMI. There was no significant difference in the treatment. After interventional therapy, oral aspirin enteric-coated tablets were taken at a dose of 100 mg once a day. Captopril (18 mg) and valsartan (80 mg) were taken once a day (10). The patients with AMI after treatment were followed up for one year. Major adverse cardiovascular events (MACE) in AMI patients after treatment were recorded as the group with poor prognosis, while those without MACE were classified as the group with good prognosis. Then serum samples of the two groups were again extracted to measure the contents of MCP-1, D-D and IMA. MACE mainly includes recurrent angina pectoris, AMI, severe arrhythmia, heart failure, death of CHD.
Correlation analysis
Pearson correlation analysis was used to analyze the correlation between MCP-1, D-D, IMA content and TC, TG, HDL-D, LDL-C in patients' blood lipids, and the correlation between MCP-1, D-D, IMA content and prognosis of IMA.
ROC curve analysis
The ROC curve was used to analyze the diagnostic value of IMA, D-D and MCP-1 alone and combined in AMI.
Statistical analysis
SPSS 18.0 software was used to analyze the data, and GraphPad Prism 6 was used to draw all the figures. χ2 test was used to compare the counting data. Mean ± standard deviation was used to express the measurement data. Independent t-test was used for comparison between the two groups. Paired t-test was used for analysis of data at different time points. Pearson's correlation analysis was used to analyze the relationship between variables. We made the horizontal and vertical co-ordinates according to the sample size, and used SPSS software to generate the ROC curves. Then, AUC values were determined according to the area under the curve. There was statistical difference when P<0.05.
Results
Determination of serum MCP-1, D-D and IMA levels in two groups
The expression levels of MCP-1, D-D and IMA in serum of patients in two groups were measured. It was found that the expression of MCP-1, D-D and IMA in patients with AMI was significantly higher than that in the control group (all P<0.001) (Fig. 1).
Determination of CTnT and hs-CRP in patients
The levels of CTnT (55.72±8.18 ng/l) and hs-CRP (32.95±3.62 mg/l) in patients with AMI were significantly higher than those in the control group, with CTnT (0.034±0.01 ng/l) and hs-CRP (1.02±0.35 mg/l) (all P<0.05) (Fig. 2).
Determination of blood lipids in two groups of patients
The blood lipids of the two groups were measured. There were significant differences in TC and LDL-C between AMI group and control group (both P<0.05), but no significant differences in TG and HDL-D (both P>0.05) (Fig. 3).
Prognosis and serum levels of MCP-1, D-D and IMA in patients with AMI after treatment
After treatment of 87 patients with AMI, 21 cases had recurrent angina pectoris, 7 cases had AMI and 14 cases had severe arrhythmia after one year. After treatment, 42 patients with MACE were classified as poor prognosis group, while 45 patients without MACE were classified as good prognosis group. MCP-1, D-D and IMA in patients with poor prognosis were detected within 48 h of MACE and the data were retained. At the end of the follow-up period, MCP-1, D-D and IMA in patients with good prognosis without MACE were detected, and the data of two groups were compared. The levels of MCP-1 (168.72±53.31), D-D (113.04±37.47), IMA (77.61±20.15) in patients with poor prognosis were significantly higher than those in patients with good prognosis, MCP-1 (108.14±47.20), D-D (74.53±31.48), IMA (62.21±21.47) (all P<0.05) (Fig. 4).
Correlation analysis of serum MCP-1, D-D and IMA levels
Pearson's correlation analysis was used to analyze the correlation between MCP-1, D-D, IMA and TC, TG, HDL-D, LDL-C in patient's blood lipids. The correlation between MCP-1, D-D, IMA content and prognosis of IMA was analyzed. The index levels measured by the AMI group were used as MCP-1, D-D, and IMA content.
There was no correlation between MCP-1, D-D, IMA levels and TC, TG, HDL-D, LDL-C levels in serum lipids in patients with AMI (all P>0.05) (Fig. 5). The serum levels of MCP-1, D-D and IMA were positively correlated with the levels of CTnT and hs-CRP in patients with AMI. Fig. 5A: r=0.6712, P=<0.001; Fig. 5B: r=0.4492, P=<0.001; Fig. 5C: r=0.4547, P=<0.001; Fig. 5D: r=0.5538, P=<0.001; Fig. 5E: r=0.5607, P=<0.001. Fig. 5F: r=0.5070, P=<0.001 (all P<0.05) (Fig. 6).
ROC curve analysis
The AUC was 0.8084 for patients with AMI diagnosed alone with MCP-1, the specificity was 81.61%, and the sensitivity was 69.51%. The AUC was 0.7302 for patients with AMI diagnosed alone with D-D, the specificity was 59.77%, and the sensitivity was 81.71%. The AUC was 0.7289 for AMI patients diagnosed alone with IMA, the specificity was 58.62%, and the sensitivity was 80.49%. The AUC was 0.9047 in combined detection of MCP-1, D-D and IMA in patients with AMI, the specificity was 58.62%, and the sensitivity was 93.90%. Other data are shown in Table II, and Figs. 7 and 8.
Discussion
Patients with AMI are more likely to have coronary atherosclerotic stenosis. Due to certain inducements, atherosclerotic plaque ruptures. Platelets in the blood gather on the surface of the ruptured plaque, forming blood clots, and eventually obstruct the coronary artery lumen. In addition, AMI can also be induced by a sharp increase in myocardial oxygen consumption or coronary artery spasm. Sudden cold stimulation may induce myocardial infarction. Approximately half of the patients often missed diagnosis and delayed the best time of treatment because there was no obvious changes in early ECG. Early detection of AMI can effectively improve the treatment and prognosis of patients (11,12).
MCP-1(13) is a cellular inflammatory factor secreted by monocytes, with multiple thiol and hydroxyl groups. It can promote the activation of downstream monocytes or macrophages and accelerate the formation of local microvessels on the basis of binding glycoprotein ligands. In a related study by Niu J (14), it was concluded that many diseases including cardiovascular diseases are considered to be inflammatory diseases, and MCP-1 plays a key role in the development of cardiovascular diseases. MCP-1 also works in cardiac repair and participates in ischemic angiogenesis. The results of this experiment showed that MCP-1 is highly expressed in AMI.
D-D (15,16) is a molecular marker of secondary fibrinolysis and hypercoagulability. D-D increases due to the formation of activated thrombosis and the presence of fibrinolysis activity in the early stage of myocardial infarction. This study showed that the level of D-D in serum of patients with AMI was significantly higher than that of the control group, indicating that there is a potential link between D-D and AMI. However, D-D was also increased in other diseases (17). ROC curve analysis showed that D-D was not specific for AMI and it could not be used as an independent predictor.
IMA (18) was discovered in the 1990s as a serum albumin damaged by hydroxyl radicals during myocardial ischemia. Serum albumin is known as IMA when the 2-4 amino acid residues at the N-terminus of serum albumin are deleted by N-acetylation and then bound to metallic cobalt. Sokhanvar S (19) found that IMA can be used as a diagnostic factor for acute coronary syndrome (ACS). Although its sensitivity and specificity were not higher compared with other diagnostic tests, it still has diagnostic value for coronary disease. The results of this experiment show that the level of IMA in serum of patients with AMI is significantly higher than that of control group. These results suggest that IMA can be used as an independent criterion for increased risk of AMI, which is consistent with the results of the study by Zhong et al (20).
At the same time, this paper also selected two common indicators of AMI: Cardiac troponin (cTnT) and high-sensitivity C-reactive protein (hs-CRP). CTnT is considered to be the most ideal early diagnostic index for AMI at present, and it is also an important index for patients' disease evaluation, prognosis judgment and curative effect observation (21). hs-CRP is one of the risk indicators for cardiovascular and cerebrovascular diseases (22). The results of this study showed that the levels of cTnT and hs-CRP in the patients with AMI were significantly higher than those in the control group, which was consistent with the results of Keller and Han (23,24). It was found that MCP-1, D-D and IMA were highly expressed in patients with AMI. It was speculated that MCP-1, D-D and IMA were potentially associated with cTnT and hs-CRP. Pearson correlation analysis showed that serum MCP-1, D-D, IMA levels were positively correlated with CTnT and hs-CRP levels in patients with AMI. Patients were followed up for one year after treatment. Patients received routine treatment, so there is no difference in the effect of treatment on prognosis. According to the occurrence of MACE, patients were divided into group with the poor prognosis and group with good prognosis, and the levels of MCP-1, D-D and IMA in the two groups were detected. The results showed that the levels of MCP-1, D-D and IMA in patients with poor prognosis were significantly higher than those in patients with good prognosis, suggesting that detection of MCP-1, D-D and IMA expression levels can predict the prognosis of patients with AMI.
The ROC curves of patients with MCP-1, D-D and IMA were analyzed. The AUC of single detection of AMI was 0.8084, 0.7302 and 0.7289, respectively. However, the AUC of three combined detection was 0.9047, and the specificity and sensitivity were significantly improved, suggesting that combined detection can improve the accuracy of diagnosis of AMI, so misdiagnosis and missed diagnosis could be reduced. However, this study also has certain limitations, such as the small sample size. Moreover, the combined detection of MCP-1, D-D and IMA in this study can only be used as a complementary diagnosis, but not as a substitute for coronary angiography. This experiment failed to make a deeper exploration of the pathogenesis of AMI, and hope that in-depth research will be conducted in the future. We did not collect multicenter data in this study, but multicenter data will be collected in the future.
In conclusion, combined detection of MCP-1, D-D and IMA can effectively improve the diagnostic rate of AMI, detect the levels of IMA, D-D and MCP-1 to predict the prognosis of patients, and suggest routine joint detection in clinical departments.
Acknowledgements
Not applicable.
Funding
No funding was received.
Availability of data and materials
The datasets used and/or analyzed during the present study are available from the corresponding author on reasonable request.
Authors' contributions
MD and ML conceived and designed the study, and drafted the manuscript. MD, ML and HY collected, analyzed and interpreted the experimental data. HY revised the manuscript for important intellectual content. All authors read and approved the final manuscript.
Ethics approval and consent to participate
The study was approved by the Ethics Committee of China-Japan Union Hospital of Jilin University. Signed written informed consents were obtained from the patients and/or guardians.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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