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Advances in Interventional Cardiology/Postępy w Kardiologii Interwencyjnej
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vol. 14
Original paper

Left ventricular reverse remodeling in patients with anterior wall ST-segment elevation acute myocardial infarction treated with primary percutaneous coronary intervention

Marek Grabka, Magdalena Kocierz-Woźnowska, Maciej Wybraniec, Maciej Turski, Marcin Wita, Krystian Wita, Katarzyna Mizia-Stec

Adv Interv Cardiol 2018; 14, 4 (54): 373–382
Online publish date: 2018/12/11
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The publication concerns the novel issue connected with late follow-up after myocardial infarction – reverse remodeling. It leads to improvement of myocardial function and takes place in the first 3–6 months after myocardial infarction (MI). There are limited data about reverse remodeling after MI and its influence in terms of clinical effects, adverse events and quality of life. The paper presents prediction of reverse remodeling in a small, narrowly selected group of ST-segment elevation myocardial infarction patients.


Despite rapid progress in percutaneous coronary interventions (PCI), a certain proportion of patients with acute coronary syndromes (ACS) exhibit clinically relevant left ventricular (LV) dysfunction within the area supplied by the affected coronary artery. According to former studies, about 20–30% of patients with ST-segment elevation myocardial infarction (STEMI) treated with primary PCI suffer from considerable myocardial injury, which leads to adverse remodeling. In turn, this corresponds with the increased risk of major adverse cardiovascular events [1, 2].
The final area of myocardial infarction is inextricably connected with the occurrence of long-term complications, such as heart failure and malignant ventricular arrhythmias, translating to impaired quality of life and increased mortality. This refers in particular to anterior wall STEMI, which is caused by acute occlusion of the left anterior descending (LAD) artery and confers a large area of necrosis and LV remodeling and further systolic and diastolic dysfunction [3, 4]. The process of LV wall remodeling substantially increases the risk of major adverse cardiovascular events (MACE), including death. Pharmacological management of STEMI in the form of angiotensin-converting enzyme inhibitors (ACEI), -blockers and mineralocorticoid receptor antagonists (MRA) leads to the reduction of the extent of pathological LV remodeling. Recently the concept of reverse remodeling was established, which is defined as the decrease of LV end-systolic volume (LVESV) by ≥ 10% in relation to the baseline value [5, 6]. Reverse remodeling is thought to be triggered by early myocardial revascularization and adequately tailored pharmacotherapy and conditioned by preserved microvascular flow within the infarction zone [6]. Of note, reverse remodeling was associated with a favorable response to cardiac resynchronization therapy (CRT) and improved prognosis in patients with heart failure [7]. More importantly, reverse remodeling was linked to improved long-term prognosis in patients with acute myocardial infarction [8]. However, its determinants have not been fully understood so far.


Accordingly, the aim of the study was to evaluate the prevalence and predictors of the phenomenon of LV reverse remodeling and investigate its association with MACE at 4-year follow-up in patients with anterior wall STEMI treated with primary PCI.

Material and methods

This prospective observational study was conducted in the First Department of Cardiology, Medical University of Silesia in Katowice and included 40 patients with the first ever acute STEMI of anterior wall with the onset of symptoms within 12 h preceding hospital admission and acute occlusion of the left anterior descending artery (TIMI 0 flow during initial coronarography in every patient). The patients were admitted between 2011 and 2013. The mandatory inclusion criteria were successful reperfusion with primary PCI reflected by TIMI 3 coronary flow grade at the end of the procedure and sufficient quality of echocardiographic imaging. Exclusion criteria consisted of: a) former myocardial infarction; b) hypertrophic cardiomyopathy; c) heart rhythm different than sinus rhythm; d) obesity (body mass index (BMI) > 30 kg/m2); e) contraindications to cardiac magnetic resonance imaging and/or gadolinium use.
All the enrolled patients granted their written informed consent for participation in the study and personal data processing. The study protocol was approved by the local Ethics Committee and the study adhered to the Declaration of Helsinki.
On admission patients with anterior wall STEMI [9] were diligently screened for inclusion and exclusion criteria. Data regarding demographic, clinical, laboratory and electrocardiographic variables were gathered in all the applicable patients. Three-dimensional transthoracic echocardiography (3D-TTE) was performed: at admission, at discharge and at 3-month follow-up. The study population was categorized into: a) patients with reverse remodeling defined as the reduction of left ventricular end systolic volume (LVESV) by ≥ 10% at 3-month observation; and b) patients with confirmed < 10% reduction or even increase of LVESV at 3-month follow-up.
Additionally, patients underwent cardiac magnetic resonance imaging (CMR) at 3-month follow-up in order to determine the mass of the infarct area relative to total left ventricular mass (LVM). Large myocardial infarction was defined as one covering ≥ 20% of LVM [10–12].
Following index hospitalization and echocardiographic and CMR check-up at 3 months, patients were subject to 4-year follow-up in order to obtain the rate of combined end-point of MACE defined as: death, urgent coronary revascularization, myocardial infarction and hospitalization due to acute decompensated heart failure. In addition, at 4 years, patients were interviewed to establish current symptomatology according to the New York Heart Association scale (NYHA) and Canadian Cardiovascular Society scale (CCS).
The association between baseline demographic and clinical parameters, as well as the presence of reverse remodeling at 3 months, and MACE rate at 4 years, was assessed. Furthermore, the link between baseline demographic, clinical, electrocardiographic and echocardiographic variables and the presence of reverse remodeling at 3 months was adjudicated.


A series of standard 12-lead electrocardiograms was performed in all patients before PCI and directly after the procedure so as to assess the maximal ST-segment elevation, as well as the sum of ST-segment elevations in all leads.


3D TTE was performed using a volumetric sector transducer (GE Vingmed Ultrasound, Horten, Norway). The probe allowed for a real-time evaluation of segments characterized by 30° of depth and 100° of width. The stored data were subsequently subject to offline echocardiographic quantification by means of TomTec software (TomTec Imaging Systems, Unterschleissheim, Germany) in order to assess LVESV, left ventricular end-diastolic volume (LVEDV), left ventricular ejection fraction (LVEF) and wall motion score index (WMSI), as well as the presence and severity of mitral valve insufficiency (MVI). The classification of MVI severity was based on vena contracta width (VC): > 7 mm – severe; 3–7 – mm moderate; < 3 mm – mild [13].
Based on the data acquired during discharge TTE, left ventricular speckle tracking imaging (STI) was conducted using the offline analysis Echo-PAC software (PC 6.0.0 GE Medical System). Global longitudinal strain (GLS) of LV was calculated as the arithmetic mean of longitudinal strain of all 16 segments of the LV, while anterior global longitudinal strain (AGLS) was derived from the arithmetic mean of anterior wall segments only (1–2, 7–8, 12–16).

Cardiac magnetic resonance (CMR)

The size and mass of the LV infarction were evaluated by means of 1.5 Tesla magnetic resonance scanner at 90 ±5 days. Cardiac magnetic resonance was performed in short axis 2- and 4-chamber view by means of contrast-free fast imaging employing a steady-state acquisition (FIESTA) cine sequence, as well as by a fast gradient recalled echo (FGRE) sequence 10 min after the administration of gadobenate dimeglumine contrast agent (Multihance; Bracco Inc.) at the dose of 0.1 mmol/kg in order to obtain late gadolinium enhancement (LGE). Cardiac magnetic resonance slice thickness was 8 mm. The CMR images were acquired during held expiration lasting for about 10 s, following deep inspiration.
The FIESTA cine sequence allowed for evaluation of LVEDV, LVESV and LVEF. The FGRE sequence indicated the sites of LGE in relation to each of the 16 segments of the LV. Subsequently, LV infarction mass and total LVM were calculated using MASS post-processing software (Medis). This semi-automatic method required manual outlining of the border of the endocardium and epicardium (LVM) and the margins of the LGE area (LV infarction mass). Both values were acquired during systole. The relative percentage of LV affected by infarction was derived from the ratio of LV infarct mass and LVM.

Patient management and definitions

Acute STEMI was diagnosed and treated according to applicable 2012 ESC Guidelines [9]. All the patients were managed invasively and were referred for coronary angiography and primary PCI of the infarct-related artery (LAD) with drug-eluting stent implantation within 12 h after onset of symptoms. All the patients received aspirin and clopidogrel loading doses prior to the procedure and unfractionated heparin intraprocedurally. The use of IIb/IIIa inhibitor was left to the discretion of the operator.
Arterial hypertension was diagnosed if blood pressure exceeded 140/90 mm Hg on two separate measurements during index hospitalization or in the event of former hypertension diagnosis or antihypertensive medication use. Diabetes mellitus/impaired fasting glucose/impaired glucose tolerance were analyzed jointly. Diabetes mellitus was diagnosed if fasting blood glucose was > 125 mg/dl on 2 separate days or if patients received insulin or oral hypoglycemic agents.

Statistical analysis

Statistical analysis was performed using Statistica 10.0 (StatSoft Poland) software. Continuous variables are expressed as mean and standard deviation (normally distributed) or as median and interquartile range (IQR) (non-normally distributed). The type of distribution was verified using the Shapiro-Wilk test. Qualitative variables are expressed as crude values and percent. Between-group differences for normally distributed quantitative variables were assessed using Student’s t-test or analysis of variance, and the Mann-Whitney U-test or Kruskal-Wallis test was used for non-normally distributed variables. For qualitative variables, Fisher’s exact test was applied. In the univariate Cox analysis reverse remodeling was defined as a dependent variable, whereas independent variables were designated from amongst peri-procedural parameters. Odds ratios (OR) with 95% confidence intervals (CIs) were calculated. A multivariate stepwise logistic regression model was not implemented on account of the low study count. Univariate Cox analysis was performed to evaluate potential variables affecting the risk of major cardiovascular events (MACE), which was further depicted by a Kaplan-Meier curve. Hazard ratios (HR) with 95% CIs were subsequently estimated. Kaplan-Meier curves for the different sub-groups were compared using the log-rank test. Throughout the analyses, a p-value of < 0.05 was considered statistically significant.


Left verticular reverse remodeling at 3-month follow-up was confirmed in 15 (37.5%) patients. The group with reverse remodeling and the control group did not differ in terms of demographic parameters and baseline cardiovascular risk factors (Table I). Patients with LV reverse remodeling were characterized by significantly lower maximal high-sensitivity troponin T (hs-TnT) concentration, lower sum of all ST-segment elevations before and after PCI and lower maximal ST-segment elevation after PCI. The presence of LV reverse remodeling was also associated with lower discharge WMSI and greater AGLS (Table II). Notably, the groups did not differ in terms of discharge LVEF (Table II).
Following 3-month follow-up, patients with LV reverse remodeling (3D-TTE) distinguished themselves with greater LVEF, and lower LVESV evaluated by simultaneous CMR (Table II). A non-significantly lower rate of large myocardial infarction (> 20% of LVM) was observed in the group with reverse remodeling (Table II).

Analysis of correlation

The change between discharge and 3-month LVESV assessed in 3D-TTE (∆LVESV) positively correlated with maximal hs-TnT concentration, the severity of MVI during index hospitalization, the sum of ST-segment elevations before and after PCI, the maximal ST-segment elevation after PCI and both GLS and AGLS (Table III). Conversely, ∆LVESV negatively correlated with LVEF assessed at 3-month follow-up by means of reference method in the form of CMR (Table III).

Univariate analysis of the predictors of LV reverse remodeling

The presence of LV reverse remodeling at 3-month follow-up was accurately heralded by lower hs-TnT levels, lower sum of ST-segment elevations before and after PCI, and lower maximal ST-segment elevation after PCI (Table IV). Among echocardiographic parameters, lower WMSI and more negative anterior global longitudinal strain (AGSL) (mean longitudinal strain in the segments supplied by LAD) were both associated with LV reverse remodeling in 3D-TTE (Table IV).

Prospective follow-up

All the patients enrolled in the study were subject to follow-up for a median of 3.4 years. In total, nine end-points were reported, including 2 deaths, 4 episodes of acute coronary syndrome requiring urgent revascularization and 3 hospital admissions due to acute decompensated heart failure. Of note, all the endpoints occurred in the study group without LV reverse remodeling at 3-month follow-up (Figure 1).
Univariate Cox analysis revealed that composite endpoint (MACE) was associated with higher baseline NYHA class, maximal ST-segment elevation after PCI and the sum of ST-segment elevations before and after PCI. MACE occurrence was also predicted by lower discharge LVEF, higher discharge WMSI and less negative GLS and AGLS (Table V). Furthermore, the onset of MACE was also associated with the growing severity of MVI reflected by higher VC, but not the mere presence of MVI itself (Table V). In the analyzed population, MVI was demonstrated in 11 patients, including 9 cases of mild MVI and 2 cases of moderate MVI (VC = 5 and VC = 6 mm). The presence of LV reverse remodeling at 3-month follow-up was not associated with MACE in 4-year observation.
The comparison of Kaplan-Meier survival curves for the study population depending on the presence of 3-month LV reverse remodeling is denoted in Figure 1. Based on the log-rank test, a non-significantly more favorable prognosis in the LV reverse modeling group was observed (log rank p = 0.07).


The current study concerned a specific cohort of patients with anterior wall STEMI submitted to primary PCI, who experienced a considerable myocardial injury at 3 months after the procedure, reflected by a predominantly large area (> 20% of LVM) of postinfarction myocardial scar (n = 23, 57.5%). The higher than expected rate of patients with adverse LV remodeling, despite the guideline-tailored approach to management, is presumably linked to prolonged time from onset of symptoms to reperfusion therapy (mean: 294 min). In the present study, the authors focused on the phenomenon of LV reverse remodeling at 3 months after anterior wall STEMI treated with primary PCI [14, 15]. This process has previously been documented in heart failure patients subject to CRT therapy or following surgical coronary revascularization [14, 15]. In the analyzed population, LV reverse remodeling was confirmed in roughly 40% of patients. The development of this favorable myocardial remodeling translates into better functional capacity and less pronounced symptoms of heart failure, as well as the reduced risk of adverse cardiovascular events. It is broadly known that adverse LV remodeling connected with the area of myocardial infarction is associated with higher risk of adverse cardiovascular events [16], while LV reverse remodeling accounts for the opposite effect on cardiovascular risk [17]. The investigation into the significance of positive LV reverse remodeling is inherent in contemporary cardiology. Parallel to reverse remodeling, a different echocardiographic parameter in the form of LVEF assessed after acute myocardial infarction is used for the identification of patients suitable for placement of an implantable-cardioverter defibrillator (ICD) for the prevention of sudden cardiac death [18]. As certain patients experience mid- and long-term improvement of LV systolic function and positive ventricular remodeling following myocardial infarction, patients are not referred for ICD/CRT implantation directly after acute coronary syndrome [18]. Thus, it is recommended to evaluate LVEF and LV reverse remodeling after at least 3 months of optimal medical therapy in order to identify patients who could benefit from ICD/CRT implantation for primary prevention of sudden cardiac death [18].
Left ventricular reverse remodeling also remains one of the beneficial signs of CRT pacing. A large body of evidence suggests that the volume parameters of LV decrease in response to CRT pacing, while device deactivation leads to a gradual increase of LV volume [19]. The development of reverse remodeling is also conditioned by optimal medical therapy, as both ACEI and -blockers facilitate reduction of LVESV [20–22]. Also, the use of an LV assist device (LVAD) was shown to cause a reduction of LV volume [23]. The majority of former studies analyzed the role of LV reverse remodeling in patients with heart failure or cardiomyopathies, whereas its significance in patients with STEMI has not been extensively investigated. One of the few studies in the field, the AMICI trial [8], delivered evidence for the significance of ST-segment elevation reduction after PCI as a crucial determinant of LV reverse remodeling [8]. Unlike in the present report, the presence of reverse remodeling was verified not at 3 months, but at 6 months after the incident [8]. Left ventricular reverse remodeling was defined in a similar way to the current study and occurred in 39% of patients (vs. 37.5% in our study).
In the Japanese study by Morishita et al. [24] LV reverse modeling was demonstrated in 52% of patients, despite the strict criterion of ≥ 15% LVESV reduction [24]. The difference between the present study and the cited report may be underlined by the longer (6-month) observation time in the latter study [24]. This discrepancy may well be related to the significantly shorter pain to balloon time (1.0–1.8 vs. 4.7–4.9 h), which also accounted for higher LVEF values in the Japanese study [24]. It is widely accepted that prolonged coronary revascularization leads to impaired prognosis; hence time to balloon should not exceed 90 min [25]. It was shown that any reduction of time to reperfusion translates into improvement of LV function assessed by means of CMR [26].
The determinants of LV reverse remodeling corroborated in the current study are in line with the acknowledged parameters formerly described in the literature. Lower concentration of cardiac troponin [27, 28], as well as several electrocardiographic [29] and echocardiographic parameters [30], proved to be predictors of LV remodeling in the present study.
The study provided evidence to support the notion that speckle tracking-derived mean longitudinal strain of anterior wall segments (AGLS) supplied by the LAD constitutes a potent predictor of favorable LV remodeling. In the study by Spinelli et al., speckle tracking allowed for precise prediction of favorable change of LV anatomy by estimation of LV torsional strain [5]. In addition, the research by Mitro et al. showed that LV strain rate heralded the response to CRT [31]. The predictive significance of speckle tracking imaging was also confirmed in the case of reverse left atrial remodeling after mitral valve surgery [32].
The present research constitutes a unique approach at evaluation of the use of LV longitudinal strain (GLS and AGLS) for the prediction of LV reverse remodeling after acute myocardial infarction. Although AGLS remained a predictor of LV reverse remodeling, GLS did not prove to be useful for this purpose, which may be linked to increased regional contractility of the contralateral (basal segments) of LV compensating for the impaired contractility within the area supplied by the infarct-related artery.
In the analyzed population, only nine endpoints were reported. All the endpoints occurred in the group without LV reverse remodeling and with a large area of myocardial necrosis. The considerably low amount of endpoints may be due to adequate pharmacotherapy in adherence to ESC guidelines [9]. This favorable pharmacological effect is augmented by a large number of patients with preserved LV systolic function at discharge. This fact is considered to be a potent predictor of favorable prognosis after coronary incidents. Moreover, our population was characterized by relatively low prevalence of diabetes mellitus (12.5%), which has a deleterious effect on prognosis and postinfarction scarring area based on echocardiographic and CMR imaging [33]. According to previous studies, diabetes mellitus is present in 21–25% [34] or even 35% of patients with a STEMI diagnosis [25]. For this reason, the mortality rate in 4-year observation was much lower than the average 1-year mortality in contemporary STEMI registries [24, 35, 36].
Yet another aspect of our study is the prognostic significance of AGLS and GLS with respect to the 4-year composite endpoint. According to a recent study by Milewska et al., LV GLS exceeding the threshold of > –12.8% was associated with adverse cardiovascular events, irrespective of LVEF value [37]. According to a recent systematic review concerning the role of speckle tracking in myocardial infarction of different locations, GLS exhibited predictive power regarding both reverse remodeling and MACE [38]. Our study also corroborated the role of classic electrocardiographic parameters in the prediction of adverse cardiovascular events in a population of patients with STEMI. These findings are in accordance with the former observations concerning the relationship between maximal pre-PCI ST-segment elevation and the area of necrosis [39], as well as between post-procedural regression of ST-segment elevation and the success of coronary reperfusion therapy [40].
Surprisingly, the presence of LV reverse remodeling at 3-month follow-up was not associated with the long-term onset of MACE. The authors presume that this finding may be explained by the very narrow inclusion criteria with first ever anterior wall STEMI patients only and relatively high discharge LVEF and echocardiographic volume indices resembling physiological values. For this reason, LV reverse remodeling pertained to a population at relatively low risk of MACE onset.
The univariate Cox analysis yielded negative results concerning prognostic significance of MVI, time from onset of symptoms to reperfusion or presence of diabetes mellitus (Table V). The limited prognostic significance of MVI may be explained by predominantly mild MVI severity and the lack of severe MVI in the study population. Based on the literature, MVI severity corresponds with impaired outcome and predicts adverse LV remodeling [39]. However, the significance of MVI is pronounced, providing that MVI is predominantly of moderate severity.
Last but no least, it was previously proven that presence of LV reverse remodeling corresponds with cardiovascular event-free survival in 2-year observation [8], as well as with long-term heart failure-free survival [6]. This intrinsic finding was somewhat recapitulated in our current manuscript, as the survival curves of both groups non-significantly differed in terms of composite endpoint rate in favor of patients with LV reverse remodeling (Figure 1; log-rank p = 0.07).

Study limitations

The results of the study should be interpreted with caution on account of the low study count related to the specific and narrow inclusion criteria of first ever myocardial infarction limited only to anterior wall localization. This is the reason that the value of our outcome may be limited. Since the majority of study participants were men (75%), the effect of sex could have modified the study results. According to contemporary data, the proportion of women in the population of patients with myocardial infarction is 30–34% [41, 42]. The low amount of end-points represents a considerable limitation, which is presumably caused by the high extent of preserved myocardium following successful PCI. Yet another shortcoming of the study is the intentional exclusion of certain myocardial segments during 3D-TTE post-processing due to poor visualization, which could theoretically have altered the study results. The overall proportion of segments excluded from analysis was 5%, which is comparable to other studies in the field [43].


The rate of LV reverse remodeling in patients with the first ever anterior STEMI treated with primary PCI is high. The development of LV reverse remodeling at 3 months was predicted by lower hs-TnT values, lower value of the sum of ST-segment elevations before and after PCI, lower maximal ST-segment elevations after PCI, lower WMSI and more negative longitudinal strain in the area supplied by the infarct-related artery. LV reverse remodeling was not associated with the endpoints in 4-year observation.

Conflict of interest

The authors declare no conflict of interest.


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