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Prognostication of Late Cardiac Remodeling in Patients With STEMI Underwent Successful Percutaneous Coronary Intervention: the Role of Macrophage Inhibitory Factor

Olga V. Petyunina1, MD, PhD; Mykola P. Kopytsya2, MD, PhD; Alexander E. Berezin3, MD, PhD

1 Senior researcher of department of prevention and treatment of emergency conditions, Government Institution “L.T.Malaya Therapy National Institute NAMSU”, 2A Liubovi Maloy av, Kharkiv, Ukraine.
2 Doctor of medical science, Chief of Department of prevention and treatment of emergency conditions, Government Institution “L.T.Malaya Therapy National Institute NAMSU”, 2A Liubovi Maloy av, 61039, Kharkiv, Ukraine.
3 Senior Consultant of Therapeutic Unit, Internal Medicine Department, State Medical University of Zaporozhye, 26, Mayakovsky av, Zaporozhye, 69035, Ukraine.

Conflict-of-interest statement: The author(s) declare(s) that there is no conflict of interest regarding the publication of this paper.

Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http: //creativecommons.org/licenses/by-nc/4.0/

Correspondence to: Alexander E. Berezin, Professor, MD, PhD, Senior Consultant of Therapeutic Unit, Internal Medicine Department, State Medical University of Zaporozhye, 26, Mayakovsky av, Zaporozhye, Ukraine.
Email: aeberezin@gmail.com; dr_berezin@mail.ru
Telephone: +966-12-2266666, ext. 25797
Fax: +380612894585

Received: May 31, 2019
Revised: May 31, 2019
Accepted: May 31 2019
Published online: July 3, 2019

ABSTRACT

Background: Macrophage inhibitory factor (MIF) plays a pivotal role in late adverse cardiac remodeling in acute ST-segment elevation myocardial infarction (STEMI). The aim of the study was to investigate the predictive role of the circulating MIF in adverse cardiac remodeling in STEMI patients undergoing percutaneous coronary intervention (PCI).

Methods: A total of 73 patients with confirmed acute STEMI successfully treated with PCI were enrolled for participation in the study. Control group was included 20 healthy volunteers. All patients signed informed consent to participate in the study. Echo and Doppler, biomarker assay and MIF determinations were performed at baseline and at 6 month after study entry.

Results: There were significant differences (p < 0.001) between the levels of MIF in control group (573.75 ng/mL; 95% CI = 397.80 to 1016.75 ng/mL) and entire STEMI patient population (2582.80 ng/mL; 95% CI = 1308.40 to 4122.20 ng/mL). The entire STEMI patient population was divided by the median of the MIF level as follow: the first group consisted of STEMI patients with MIF ≤ 2582.80 ng/ mL (n = 36), and the second group consisted of STEMI patients with the levels of MIF > 2582.80 ng/mL (n = 37). We found that cut-off MIF level ≥ 2644.5 ng/ml at baseline predicted adverse cardiac remodeling (AUC = 0.736, 95% CІ = 0.515 to 0.956, p = 0.0362; sensitivity = 72.7%; specificity = 81.8%; positive predictive value = 52.7%; negative predictive value = 32.4%; positive likelihood ratio = 0.89 and negative likelihood ratio = 0.72).

Conclusions: The MIF level ≥ 2644.5 ng/mL might be predictor for late adverse cardiac remodeling after STEMI.

Key words: ST-segment elevation myocardial infarction; Adverse cardiac remodeling; Macrophage inhibitory factor; Prediction

© 2019 The Author(s). Published by ACT Publishing Group Ltd. All rights reserved.

Petyunina OV, Kopytsya MP, Berezin AA. Prognostication of Late Cardiac Remodeling in Patients With STEMI Underwent Successful Percutaneous Coronary Intervention: the Role of Macrophage Inhibitory Factor. Journal of Cardiology and Therapy 2019; 6(1): 781-788 Available from: URL: http: //www.ghrnet.org/index.php/jct/article/view/2606

INTRODUCTION

Acute myocardial infarction (AMI) and adverse cardiac remodelling that frequently follows remain to be leading causes of cardiovascular (CV) death and heart failure (HF) development worldwide[1]. It has found that final AMI size and post-AMI HF are results of the dynamic immune cell response and inflammation, which comprises an initial pro-inflammatory reaction followed by an anti-inflammatory phase[2]. Indeed, inflammation, which are involved numerous cells, such as neutrophils, monocytes/macrophages, lymphocytes, dendritic cells, pericardial lymphoid cells, progenitor precursors, endothelial cells, cardiac myocytes and fibroblasts, promotes turn over early adaptive cardiac remodeling to disadptive remodeling and shaping HF[3]. For instance, myocardial healing and hypertrophy, scar forming and expansion, extracellular matrix accumulation, fibrosis, are under dynamic control of circulating and vesicle-derived inflammatory mediators, growth factors, chemokines, and neurohormons[4-6].

Macrophage inhibitory factor (MIF) is defined as pleotropic multifunctional cytokine with inflammatory chemokine properties, which acts as inflammation regulator and mediator of congenital and acquired immunity, neoangiogenesis, vasculogenesis, and glucose homeostasis[7]. MIF is highly expressed and released from immune cells (macrophages, monocytes, T-lymphocytes, endothelium), cardiac myocytes, fibroblasts in response of hypoxia/ischemia, endotoxins, oxidative stress, and due to direct effect of several pro-inflammatory cytokines, such as interleukin-6, hypoxia induce factor-1 alpha[8]. Elevated serum levels of MIF were found in patients with multifocal atherosclerosis across all stages of plaque formation and rupture, acute coronary syndrome, acute MI[9].

The role of MIF in pathogenesis of AMI and post-AMI cardiac remodelling appears to be controversial. MIF showed both tissue protective ability and direct tissue damage effect in patients with AMI depending on pre-conditioning and post-conditioning period[10,11]. Indeed, cardiac protective actions of MIF were accompanied by MAPK and PI3K/Akt/mTOR pathways, and mediated glucose uptake, oxidative stress suppression, and apoptosis inhibition that were associated with stem cell proliferation and differentiation of endothelial progenitor cells in myocardium and vasculature around infarct zone [12, 13]. On contrary, MIF was able to influence on migration of inflammatory, antigen-presenting and immune cells into damaged area and attenuate ischemia-induced adverse cardiac remodeling[14]. In fact, early coronary intervention have been considered as a leading factor for improvement of survival and preventing cardiac remodeling and HF among STEMI patients[15], while there is limiting evidence regarding discriminative value of circulating MIF for cardiac remodeling and HF after successful percutaneous coronary intervention (PCI) in AMI[16]. The aim of the study was to investigate the predictive role of the circulating MIF in adverse cardiac remodeling in patients with acute ST-segment elevation myocardial infarction (STEMI) undergoing PCI.

METHODS

Patients’ population

A total of 268 patients with confirmed acute STEMI were screened for participation in the study. Control group was included 20 healthy volunteers. Flowchart of the study design is shown in Figure 1. From the entire population of STEMI (n = 268) and according to the inclusion and non-inclusion criteria, 177 individuals who were admitted to intensive care unit of GI “L.T.Malaya TNI NAMSU” with acute STEMI within 2-12 hours of symptoms onset in between August 2016 and July 2018 were enrolled into the study. STEMI was diagnosed according to the ECS Guidelines (2017)[17]. Inclusion criteria included known STEMI, age > 18 years old, and lack of contraindication to PCI. Non-inclusion criteria included previous myocardial infarction, established chronic HF, known malignancy, severe comorbidities (anemia, chronic obstructive lung disease, bronchial asthma, liver cirrhosis, chronic kidney disease, valvular heart disease, bleeding), inability to understand of written informed consent. The final study cohort retrospectively included 73 patients with confirmed STEMI after primary or facilitated PCI with successful revascularization of TIMI-III. Primary PCI with bare-metal stent (COMMANDER, “Alvimedica”, Turkey) implantation was performed in 43 patients, and 30 patients were previously treated with primary thrombolysis (tenecteplase, alteplase) as a rescue procedure before admission, which was followed by PCI within six to twelve hours after the initial STEMI confirmation. Thrombolysis was done with tenecteplase (Metalise, Boehringer Ingelheim Pharma, Germany), depending on patients weight and was not more than 50 mg iv bolus. Alteplase (Actilyse, Boehringer Ingelheim Pharma, Germany) 100 mg was infused intravenously for two hours. All investigated patients received adjuvant treatment according to the current ESC recommendations.

Figure 1 The flow chart for study design. Abbreviations: STEMI, ST-segment elevation myocardial infarction; PCI, percutaneous coronary intervention; HF, heart failure; HFrEF, HF with reduced ejection fraction; HFpEF, HF with preserved ejection fraction; HFmrEF, HF with mid-range ejection fraction; CAD, coronary artery disease; LV, left ventricular.

Ethical declaration

The study complied with the Declaration of Helsinki and was approved by the local ethics committee (Protocol №8, 29.08.2016). All patients signed informed consent to participate in the study.

Coronary angiography

Conventional coronary angiography was performed using Digital X-Ray system “Integris Allura” (Philips Healthcare, Best, The Netherlands) and managed by radial or femoral vascular access. Coronary arteries were visualized with two-to-three orthogonal projections. In this study, the contrast “Ultravist-370” (Bayer Pharma GmbH, Germany) and automatic contrast injector were used. The contrast amount used in coronary angiography in each injection was 8 - 10 mL at 4 mL/s for the left coronary artery and 6 mL at 3 mL/s for the right coronary artery (radiation exposure 20 to 35 mGycm). The number of views obtained was decided by the operator depending on coronary anatomy. The coronary arteries were divided into segments according to the American Heart Association classification.

Determination of risk factors and comorbidities

Hypercholesterolemia (HCE) was diagnosed if the total cholesterol (TC) level was above 5.2 mmol/L, and/or the low-density lipoprotein cholesterol (LDL) level was above 3.0 mmol/L, and/or the level of triglycerides (ТG) was above 1.7 mmol/L according to the European Cardiology Society dyslipidemia guideline (2016)[18]. Hypertension was diagnosed if the systolic blood pressure (SBP) was > 140 mm Hg, and/or the diastolic blood pressure (DBP) > 90 mm Hg according to the European guideline on diagnostics and treatment of arterial hypertension, 2018[19]. Newly diagnosed HF was verified according to ESC guidelines (2016)[20]. Type 2 diabetes mellitus was determined according to the new ADA statement (2017)[21].

Echo and Doppler examination

Echo-CG was performed on “Sono Ace X6” ultrasound station (Medison, South Korea) by using a phase probe with an ultrasound frequency of 3.5 MHz at discharge and at six-month post-PCI. Left ventricular (LV) end diastolic volume (EDV), LV end systolic volume (ESV), left atrium volume (LAV), LV ejection fraction (EF) were measured according to Simpson’s biplane method[22].

Determination of late adverse cardiac remodeling

Late adverse cardiac remodeling was defined as increased LVEDV (> 10% from baseline) and/or LVESV (> 10% from baseline) over next six months after acute STEMI managed by PCI or occurrence of newly diagnosed HF[23].

Physical exercise examination

6-minute walking test was performed at 6-month to identify clinical significance of cardiac remodeling and identify severity of HF according to ESC guidelines (2016)[20].

Sample size calculation

The sample size was calculated through the effect size estimated (0.99), the type of present study, providing study power of 80% and type I error 5%[24]. The sample size is at least 170 individuals.

Calculation of glomerular filtration rate

Glomerular filtration rate (GFR) was calculated by the CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equation[25].

Blood samples

Blood samples were drawn immediately before PCI at baseline and at six month of post-PCI period. Blood samples were centrifuged, serum was isolated within 30 minutes of sample acquisition, and then they were stored in plastic tubes and frozen at -70℃ until being shipped to the laboratory of immunechemical and molecular-genetic researches of GI “L.T.Malaya TNI NAMSU”.

Troponin I (Tn I) level was measured by chemoluminescent immunoassay (Humalyzer 2000, HUMAN GmbH, Germany) according to the manufacturers’ recommendations. The average of Tn I level was 0.5-50 ng/mL.

Total cholesterol (TC), low-density lipoprotein (LDL) cholesterol, high-density lipoprotein (HDL) cholesterol and triglycerides (TG) were measured by direct enzymatic method (Roche P800 analyzer, Basel, Switzerland). The intra-assay and inter-assay coefficients of variation were < 5%.

Fasting glucose level was measured by double-antibody sandwich immunoassay (Elecsys 1010 analyzer, F. Hoffmann-La Roche Diagnostics, Mannheim, Germany). The intra-assay and inter-assay coefficients of variation were < 5%.

MIF levels were measured using Humalyzer 2000 (HUMAN GmbH, Germany) by the enzyme linked immunoassay method (RayBio® Human MIF ELISA KIT, USA).

Statistics

Statistical analyses were performed using SPSS for Windows v. 23 (IBM, USA). Continuous variables are presented as mean ± standard deviation and mean and 95% confidence interval (CI) when they were normally distributed, or median and interquartile range if otherwise. Categorical variables are presented as frequencies and percentages. Mann-Whitney and Wald-Wolfowitz criteria were used for intergroup differences and quantitative values. The qualitative variables are expressed as percentages, and were analyzed by the χ2 test and exact Fisher test. Receiver operating characteristic (ROC) curve was performed for detection of well-balanced cut-off of MIF concentrations. Area under curve (AUC), sensitivity and specificity were calculated for cut-off point. All differences were considered statistically significant with 2-tailed p < 0.05.

RESULTS

Entire STEMI patient population was consisted male and female (72.6%/27.4%) with hypertension (69.9%), hypercholesterolemia (72.6%), obesity (35.6%), and stable angina prior to STEMI (30.1%). At least 67% of patients included in the study were smokers. Table 1 is reported clinical characteristic of included patients with STEMI.

There were significant differences (p < 0.001) between the levels of MIF in control group (573.75 ng/mL; 95% CI = 397.80 to 1016.75 ng/mL) and entire STEMI patient population (2582.80 ng/mL; 95% CI = 1308.40 to 4122.20 ng/mL) (Figure 2). The entire STEMI patient population was divided by the median of the MIF level as follow: the first group consisted of STEMI patients with MIF ≤ 2582.80 ng/ mL (n = 36), and the second group consisted of STEMI patients with the levels of MIF > 2582.80 ng/mL (n = 37). The only variable that was yielded a significant difference (p = 0.034) between both subgroups depending on MIF levels was frequency of stable angina before STEMI (Table 1). Other variables did not differ between patients in both subgroups.

Table 2 is reported angiographic and clinical data among STEMI patients. Anterior myocardial infarction and LAD injury observed more frequently in the second group, with the level of MIF higher median (p = 0.047; p = 0.016 respectively) and together with significantly higher troponin I level indicates a direct connection with MI size.

Figure 2 Circulating levels of MIF in healthy volunteers and patients with known STEMI.

Table 1 Basic clinical characteristic of researched patients with acute STEMI.
DataEntire population (n=73)MIF level ± 2582.80 ng/mL (n=36)MIF level >2582.80 ng/mL (n=37) c2 value /Р value
Age, years58.37 ± 10.3457.44 ± 9.3759.03 ± 11.480.521
Male, n (%)53 (72.6)24 (66.7)29 (78.2)1.26 p=0.262
Female, n (%)20 (27.4)12 (33.3)8 (21.8) 
Hypertension, n (%)51 (69.9)28 (77.8)23 (62.2)2.11 p=0.146
T2DM, n (%)5 (6.8)4 (11.1)1 (2.7)0.92 p=0.338
BMI>30, kg/m226 (35.6)15 (46.7)11 (29.7)1.13 p=0.287
HCE, n (%)53 (72.6)26 (72.2)27 (73.0)0.01 p=0.943
Smoking, n (%) 49 (67.1)23 (63.8)26 (70.3)0.34 p=0.562
Stable angina before STEMI22 (30.1)15 (41.7)7 (18.9)4.48 p=0.034
GFR, ml/min/1.73 m283.22 [69.77-107.41]85.35 [72.05-106.92]82.14 [66.36-107.46]0.566
TC, mmol/l5.25 ± 1.265.41 ± 1.335.17 ± 1.210.425
HDL, mmol/l1.05 ± 0.301.06 ± 0.311.05 ± 0.300.999
LDL, mmol/l3.18 ± 1.243.07 ± 1.433.32 ± 1.060.403
Troponin І, ng/ml27 [11-38]23[10-31]27 [14-36]0.043
Peripheral blood leucocytes, *109/l10.8 [8.3-12.3]9,8 [8.3-10.3]11.7 [7.9-12.8]0.011
MIF, ng/ml2582.80 [1308.40-4122.20]1277.85 [556.70-1931.80]3954.00[3076.30-4964.30]<0.001
Abbreviations: BMI: body mass index; T2DM: type 2diabetes mellitus; GFR: glomerular filtration rate; HCE: hypercholesterolemia; HDL: high density cholesterol; MI: myocardial infarction; MIF: macrophage inhibitory factor; TC - total cholesterol; LDL - low-density lipoprotein; HDL - high-density lipoprotein.

Table 2 Angiographic and clinical data of the STEMI patients.
DataEntire population (n=73) MIF level ≤ 2582.80 ng/mL (n=36)MIF level >2582.80 ng/mL (n=37)c2 value /Р value
STEMI localization
Anterior, n (%)39 (53.4)15 (41.6)24 (64.9)3.95 p=0.047
Posterior, n (%)32 (43.8)19 (52.7)13 (35.1)2.31 p=0.129
Amount of injured coronary arteries
One, n (%)37 (50.7)19 (52.7)18 (48.6)0.12 p=0.724
Two, n (%)21 (28.8)9 (25.0)12 (32.7)0.49 p=0.483
Three and more, n (%)14 (19.2)7 (19.4)7 (18.9)0.06 p=0.810
Amount of coronary artery stenosis
One artery, n (%)31 (42.5)16 (44.4)15 (40.5)0.11 p=0.736
Two and more stenotic arteries, n (%)42 (56.2)20 (52.8)22 (59.5)0.33 p=0.565
Injured coronary arteries
Left main, n (%)4 (5.5)2 (3.2)2 (5.4)0.682 p=0.520
LAD, n (%)52 (71.2)21 (58.3)31 (83.8)5.77 p=0.016
RCA, n (%)41 (56.2)24 (66.7)17 (45.9)3.18 p=0.075
Circumflex, n (%)28 (38.4)14 (38.9)14 (37.8)0.01 p=0.926
Complications of STEMI
General amount, n (%)17 (23.3)9 (25.0)8 (21.6)0.12 p=0.949
Killip II-III, n (%)5 (6.8)2 (5.6)3 (8.1)0.003 p=0.513
Killip IV, n (%)2 (2.7)1 (2.8)1 (2.7)0.0001 p=0.747
Adverse cardiac remodeling after 6 month29 (39.7)12 (33.3)17 (45.9)5.45 p=0.02
Procedures and medications
PCI, n (%) 43 (58.9)17 (47.2)25 (67.6)2.31 p=0.129
TLT+PCI, n (%)30 (41.1)19 (52.8)12 (32.4)3.13 p=0.077
ACEi/ARA ІІ n (%)59 (80.82)34 (94.44)25 (67.57)6.82 p=0.009
β-blockers, n (%)61 (83.6)27 (83.3)34 (94.6)0.052 p=0.050
Statin, n (%)73 (100)36 (100)37 (100)-
Aspirin, n (%)73 (100)36 (100)37 (100)-
Clopidogrel, n (%)48 (65.8)22 (61.1)26 (70.3)0.68 p=0.410
Ticagrelor, n (%)25 (34.2)12 (33.3)13 (35.1)0.03 p=0.871
MKRA, n (%)5 (6.8)2 (5.6)3 (8.1)0.003 p=0.513
Abbreviations: ACEi: angiotensin converting enzyme inhibitors, ARAII; antagonist of receptors to angiotensin II, MKRA: antagonist of mineralocorticoid receptor, PCI: percutaneous coronary intervention, RCA: right coronary artery; LAD: left artery descending; TLT: thrombolytic therapy.

Table 3 Hemodynamic variables in STEMI patients at baseline and at 6-month of observation period.
DataPeriod of observationEntire population (n=73) MIF level > 2582.80 ng/mL (n=36)MIF level >2582.80 ng/mL (n=37) P value
SBP, мм рт.ст.Baseline129.22 ± 19.93131.33 ± 19.47127.16 ± 20.430.363
SBP, мм рт.ст.6 month133.96 ± 16.48134.29 ± 17.42129.00 ± 15.060.169
± value 0.120.4990.662 
DBP, мм рт.ст.Baseline78.18 ± 10.3580.08 ± 9.3676.32 ± 11.040.087
DBP,мм рт.ст.6 month80.50 ± 10.1380.71 ± 9.3280.00 ± 11.560.774
± value 0.1730.776  
HR, за 1 хв.Baseline75.01 ± 13.9972.83 ± 13.2077.14 ± 14.570.297
HR, за 1 хв.6 month71.71 ± 11.5768.29 ± 10.3672.53 ± 13.030.129
± value 0.1230.1090.156 
LV EDV, млBaseline133.09 ± 30.68132.16 ± 33.33134.00 ± 28.310.877
LV EDV, мл6 month139.43 ± 21.92119.41 ± 23.75143.88 ± 26.590.006
± value 0.1530.0660.047 
LV ESV, млBaseline61.51 ± 24.4259.23 ± 23.3263.72 ± 25.570.477
LV ESV, мл6 month68.79 ± 34.2261.30 ± 18.5369.25 ± 21.050.092
± value 0.1410.6780.313 
Mitral regurgitation І-ІІ, n (%)Baseline38 (52.05%)22 (61.11%)16 (43.24%)0.131
Mitral regurgitation І-ІІ, n (%)6 month41 (56.2%)23(63.9%)18 (48.6%)0.192
Р value 0.6160.80.647 
LVMM, гBaseline225.49 ± 56.48221.48 ± 55.02229.50 ± 58.410.521
LVMM, г6 month227.51 ± 38.42223.87 ± 41.56231.41 ± 36.840.415
P value 0.8010.8360.867 
LAV, млBaseline60.41 ± 19.2859.17 ± 23.2761.15 ± 17.420.681
LAV,мл6 month61.12 ± 20.3760.32 ± 19.4862.52 ± 21.540.649
P value 0.8290.8210.764 
LVEF, %Baseline52.15 ± 9.3253.39 ± 7.0050.94 ± 11.090.38
LVEF, %6 month53.25 ± 10.1055.24 ± 6.9754.84 ± 11.600.859
P value 0.4950.2650.144 
6-minute walking test6 month428.4 ± 100.6446.3 ± 64.6416.5 ± 120.10.193
Abbreviations: 1: in acute period; 2: after 6-month observation period; DBP: diastolic pressure; SBP - systolic pressure; LAV: left atrium volume; LV EDV: left ventricular end diastolic volume; LV ESV - left ventricular end systolic volume; LVEF - left ventricular ejection fraction.

Hemodynamic status in STEMI patients at baseline and at 6-month observation has shown in Table 3. There was not significant differences between subgroups of STEMI patients with up and bottom mean levels of MIF in majority of hemodynamic characteristics and distance of 6-minute walking, but significant increase in LVEDV was defined in patients with MIF level > 2582.80 ng/mL. Additionally, serum levels of MIF in STEMI patients were significantly (p = 0.017) higher in patients with 6-month post-STEMI LV dilation (4122.16 ng/mL; 95% CI = 2869.10 to 5399.70 ng/mL) versus not having it (2044.65 ng/mL; 95% CI = 585.50 to 2644.50 ng/mL).

We also determined positive linear relation between serum levels of MIF, and concentrations of troponin I (r = 0.33; p = 0.045), peripheral blood leukocytes (r = 0.36; p = 0.039), T2DM (r = 0.31; p = 0.048), and appearance of 6-month post-STEMI LV dilation (r = 0.44; p = 0.044). The inverse relation was fond between MIF levels and GFR (r = -0.32; p = 0.044). There were not significant associations between serum levels of MIF, and age, sex, HCE, hypertension, smoking, and medical therapies.

ROC-analysis was performed to find MIF level, which could predict adverse remodeling at 6-month observation period in STEMI patient underwent PCI (Figure 3). We found that cut-off MIF level ≥ 2644.5 ng/mL at baseline predicted adverse cardiac remodeling (AUC = 0.736, 95% CІ = 0.515 to 0.956, p = 0.0362; sensitivity = 72.7%; specificity = 81.8%; positive predictive value = 52.7%; negative predictive value = 32.4%; positive likelihood ration = 0.89 and negative likelihood ration = 0.72).

Figure 3 The 6-month predictablepowerofserum MIFin adverse left ventricular remodeling inSTEMI patients underwent PCI. The results ofROC-analysis.

DISCUSSION

The results of our study have demonstrated that elevated levels of MIF had predictive ability to late adverse cardiac remodeling in STEMI patients underwent successful PCI. This fact can be interpreted as pre- and post-conditioned impact on myocardium probably through collateral development and prevention of remote ischemic/ reperfusion injury. Indeed, it has been found that AMI with good developed collateral vasculature around infarct area had less infarct size and lower mortality compared with those who had poor colleteralization [26].

Our study has revealed more frequent LAD injury in the group with higher levels of MIF, which indirectly indicates more severe ischemia and subsequent necrosis of anterior LV wall. Our data is comparable with the results received by Chan W et al[14] (2013). Authors have found positive correlation between the MIF level and MI size, heart chambers and negative relation to LVEF at 3rd day and 3rd month after index event. Therefore, elevated levels of MIF become independent predictor of multiple coronary artery stenosis and presence of vulnerable plaque in patients with acute coronary syndrome[27]. In this way, positive correlation between MIF and number of circulating leucocyte in peripheral blood that was established in our study clarifies that late inflammatory response can be important modulator of adverse cardiac remodeling in STEMI even after successful PCI. Although previously it has been determined the fact of strong positive association between elevated levels of MIF and poor clinical outcomes in STEMI patients[28,29], we first reported that similar relation could be determined in STEMI patients underwent successful reperfusion procedure. In this context, we can agree that MIF might become a target molecule for cardioprotective response in the future, while there are controversial issue regarding this assumption[30].

However, we found that the levels of MIF ≥ 2644.5 ng/mL were associated with adverse cardiac remodeling, while there were other co-comorbidities (hypertension, T2DM, obesity) that could influence on the result. This is study limitation, which should be solved in the future in the larger clinical study with greater sample size. The findings might have serious clinical significant, because asymptomatic adverse cardiac remodeling in STEMI patients in remote period is associated with newly HF manifestation. Moreover, complete revascularization frequently prevents HFrEF, but did not HFpEF due to presentation of metabolic comorbidities, such as T2DM and abdominal obesity. However, negative impact on survival of both HF phenotypes is similar. Indeed, Luedike P et al[30,31] 2018 have shown a strong positive association between serum levels of MIF with 180-day HF clinical outcomes, all-cause death and hospitalization in patients with HFpEF. Interestingly, MIF has been also found as independent from conventional cardiovascular risk factors the predictor of impaired cardiac function and long-term prognosis in patients with AMI and HF[32,33]. Yet, there was suggestion regarding cardioprotective role of elevated MIF in acute phase of STEMI. It has assumed that pre-conditioning effect can be mediated by MIF over expression and that collateral vascularization, myocardial fibrosis and extracellular matrix accumulation in area around infarct zone are under direct control of MIF. In this case, elevation of MIF is favorable response directed to prevention of adverse cardiac remodeling and remote HF manifestation. Large clinical studies are required to understand the role of MIF at various stage of nature evolution of STEMI, especially in patients with complete successful revascularization.

Conclusion

Elevated level of MIF might be suggested as predictor for late adverse cardiac remodeling in STEMI patients underwent successful PCI.

Acknowledgments

There are no previous presentations of the information reported in the article. We thank Dr. Nataliia Tytarenko and Dr. Igor Polivenok for performing ultrasound examination and PCI respectively. Additionally, we thank, Dr. Galina Bugrimenko for her excellent technical assistance. Permission to acknowledge has been obtained.

Author Contributions: Conception and design: Olga V. Petyunina; writing of the article Olga V Petyunina, Mykola P. Kopytsya, and Alexander E. Berezin; methodology, Mykola P. Kopytsya and Alexander E. Berezin; collection of clinical data, data curation, and investigation: Olga V. Petyunina and Mykola P. Kopytsya; statistical analysis: Olga V. Petyunina and Alexander E. Berezin; supervision, Alexander E. Berezin; critical revision of the article for intellectual content: Alexander E Berezin; interpretation of the data: Olga V Petyunina, Mykola P. Kopytsya, and Alexander E. Berezin; validation, Alexander E. Berezin; project administration, Olga V. Petyunina.

Funding: This research was a fragment of the project: “To study the biochemical, genetic mechanisms of reperfusion damage of the myocardium and to assess the cardioprotective effect of antiplatelet therapy in acute myocardial infarction”. The study was funded by Government Institution “L.T.Malaya Therapy National Institute NAMSU”, Kharkiv, Ukraine, State Registration No. 0117U003028 / Ukraine.

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