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Secondary prevention strategies after an acute ST-segment elevation myocardial infarction in the AMI code era: beyond myocardial mechanical reperfusion
© The Author(s). 2017
Received: 23 November 2016
Accepted: 3 February 2017
Published: 7 February 2017
The AMI code is a regional network enhancing a rapid and widespread access to reperfusion therapy (giving priority to primary angioplasty) in patients with acute ST-segment elevation myocardial infarction (STEMI). We aimed to assess the long-term control of conventional cardiovascular risk factors after a STEMI among patients included in the AMI code registry.
Design and methods
Four hundred and fifty-four patients were prospectively included between June-2009 and April-2013. Clinical characteristics were collected at baseline. The long-term control of cardiovascular risk factors and cardiovascular morbidity/mortality was assessed among the 6-months survivors.
A total of 423 patients overcame the first 6 months after the STEMI episode, of whom 370 (87%) underwent reperfusion therapy (363, 98% of them, with primary angioplasty). At 1-year follow-up, only 263 (62%) had adequate blood pressure control, 123 (29%) had LDL-cholesterol within targeted levels, 126/210 (60%) smokers had withdrawn from their habit and 40/112 (36%) diabetic patients had adequate glycosylated hemoglobin levels. During a median follow-up of 20 (11–30) months, cumulative mortality of 6 month-survivors was 6.1%, with 9.9% of hospital cardiovascular readmissions. The lack of assessment of LDL and HDL-cholesterol were significantly associated with higher mortality and cardiovascular readmission rates.
Whereas implementation of the AMI code resulted in a widespread access to rapid reperfusion therapy, its long-term therapeutic benefit may be partially counterbalanced by a manifestly suboptimal control of cardiovascular risk factors. Further efforts should be devoted to secondary prevention strategies after STEMI.
Case-fatality and long-term mortality after an acute myocardial infarction (AMI) has manifestly decreased over the last decades. Both the use of more effective pharmacological and revascularization strategies account for this decrease [1–4]. However, coronary artery disease (CAD) continues to be the most determinant cause of mortality in high-income societies . ST-segment elevation myocardial infarction (STEMI) is one of the main clinical manifestations of CAD, and rapid (<12 h) coronary reperfusion continuous to be the main therapeutic goal to enhance a favorable cardiovascular outcome after the index coronary event. In this scenario, primary percutaneous coronary intervention (PCI) is nowadays preferred over fibrinolysis, especially when the coronary intervention is performed within the first 120 min [6–8].
Regardless of such rapid therapeutic interventions, the readmission and mortality rates after the index AMI episode are not negligible, with an 8–20% of the patients being readmitted and 10% of them dying within the first year [9–13]. Previous reports have postulated that the suboptimal cardiovascular morbidity and mortality rates after an acute coronary event may be related to an inadequate control of the cardiovascular risk factors (secondary prevention strategies) [14–17]. However, assessment of the long-term degree of implementation and adherence to such secondary prevention strategies in STEMI patients undergoing urgent reperfusion in the era of widespread use of PCI is scarce in the literature [18–21].
In this study, we aimed to assess the long-term control of conventional cardiovascular risk factors in patients presenting with acute STEMI undergoing urgent reperfusion therapy, with urgent PCI designated as the preferred therapeutic strategy. We further analyzed the prognostic impact of an inadequate control of such risk factors.
Patient population: the AMI code program
A total of 467 consecutive STEMI patients referred to our hospital from June 2009 to April 2013 within the AMI code program were prospectively considered for inclusion. The AMI code program, created in 2009, consists of a regional network developed in Catalonia (Spain) aiming to provide a rapid and widespread access to PCI among patients presenting with an acute STEMI . More precisely, it consists of an integrated assistance network for urgent action that coordinates primary health centers, ‘non-PCI-available’ hospitals, ‘PCI-available’ hospitals and mobile emergency assistance units. Upon the diagnosis of STEMI, the AMI code is activated and primary PCI (to be performed in a preliminary designated ‘PCI-available’ institution) is set up, provided that the time interval between the onset of symptoms and the percutaneous intervention is presumed to be within the therapeutic window. Additionally, the AMI code can be activated for those patients without apparent myocardial reperfusion after pharmacological fibrinolysis (rescue angioplasty). Twenty-four to forty-eight hours after the index STEMI episode, in the absence of acute complications, patients are planned to be discharged to their reference hospital. Patients not established in Catalonia (tourists and displaced) were excluded from the analysis upon a presumably suboptimal follow-up.
The study was designed and implemented in accordance with Guidelines for Good Clinical Practice and with the ethical principles laid down in the Declaration of Helsinki.
In-hospital data collection
Demographic (age, gender) and clinical characteristics (infarct location, systolic blood pressure, Killip class at admission and left ventricular ejection fraction), as well as history and control of cardiovascular risk factors (smoking, dyslipidemia, hypertension and diabetes mellitus) and other comorbidities (personal and family history of ischemic cardiomyopathy, chronic kidney disease, anemia) were collected at the time of patient’s hospital admission during the index STEMI episode. The lipid profile, glomerular filtration rate and the glycosylated hemoglobin levels were analyzed at baseline. In-hospital morbidity and mortality, the pharmacological therapy administered during admission and the primary PCI procedure findings were also collected.
The clinical follow-up after final hospital discharge was carried out by the primary care physician or through the cardiologist outpatient clinic/primary health center at the reference physician’s discretion. After hospital discharge, assessment and control of the cardiovascular risk factors and the patient’s clinical outcome were monitored and incorporated into the study database through the Catalonia’s regional electronic health recording system, in which the patient’s clinical status, the rate of hospital readmissions after the index STEMI event, the pharmacological intake, the laboratory test and radiology results were available for the study purposes. Overall mortality was ensured by means of consultation of the National Death Registry. Heart failure, acute coronary syndrome and stroke were considered cardiovascular readmission. Following previously reported definitions, stroke was considered a cardiovascular condition in the assessment of the clinical outcome after STEMI [22–24]. Direct telephone contact with the patient was allowed in order to fulfill any missing data from the electronic health recording system.
The long-term control of conventional cardiovascular risk factors was exclusively analyzed for those patients who survived at least the first 6 months after the index STEMI episode. By these means, any bias in the results obtained related to a suboptimal risk factor control during the very initial phases after the STEMI would be avoided. A minimum 6-months follow-up period was considered compelling for the surviving study patients in order to enhance a truly long-term assessment of the efficiency of secondary prevention strategies in this population.
Assessment of the adequate implementation secondary prevention strategies (i.e. pharmacological intake, smoking habit withdrawal, blood pressure, glycosylated hemoglobin, triglyceride and cholesterol levels) was performed 12 months after the index STEMI episode. The closest laboratory and blood pressure values were retrieved by means of manual review of the patient’s electronic clinical history. A 6 to 18-month timeframe from the STEMI was allowed for the obtainment of such clinical and laboratory variables, following previously reported methodology [10, 14, 15, 18–20]. As for patients who died between the 6 months and the first year after the STEMI, the latest risk factors assessment before their decease was incorporated into the study database.
Adequate control of cardiovascular risk factors was established, following current guidelines, as follows: blood pressure <140/90 mmHg; smoking abstinence for at least 6 months; total cholesterol of <200 mg/dL, LDL-cholesterol of <70 mg/dL or ≥50% lower with respect to baseline values, HDL-cholesterol >40 mg/dL and triglycerides below 150 mg/dL [18–21, 25–28]. Glycosylated hemoglobin levels of <7.5% were pursued among diabetic study patients [18–21, 26].
Our institutional guidelines and recommendations include that all patients should undergo a cardiovascular risk factors assessment during the first year after the index STEMI event and assuming that this information was available in the regional electronic health recording system, a particular risk factor was considered: i) controlled when the targeted goal was achieved; ii) not controlled when the targeted goal was not achieved; and iii) not assessed when no information related to the risk factor was available in the electronic health record system.
A longer follow-up study period (beyond the 12-months study period) was allowed for the assessment of mortality and cardiovascular readmission rates.
Results are expressed as absolute and relative frequencies for categorical variables, as means and standard deviations (SD) or, when appropriate, as medians and interquartile ranges (IQR), for continuous variables. Student’s T-test or Man-Whitney U test was used for the comparison of quantitative variables and the chi-squared was used for the comparison of qualitative variables. A multinomial multivariate analysis was carried out in order to identify those clinical variables associated with an adequate control of the cardiovascular risk factors in our population. Finally, in order to assess the influence of risk factors control in the long-term prognosis of our population, a Cox proportional hazard regression model was used. Those variables associated with the outcomes of interest in the univariate analysis (p-value < 0.05) were included in the multivariate models, moreover we also included age, as a continuous variable, and sex. All analyses were performed using the R statistical package.
Baseline characteristics of the 6-month survivors ST-elevation myocardial infarction patients included in this registry
(n = 423)
(n = 319)
(n = 104)
63 ± 13.1
60.9 ± 12.7
69.2 ± 12.4
Former smokers (>1 year)
No drug treatment
Previous ischemic heart disease
Chronic kidney disease
Systolic blood pressure at admission (mmHg)
52.1 ± 12
52,5 ± 12
51 ± 12
Blood test at admission
(n = 423)
(n = 319)
(n = 104)
14 ± 1.8
14.4 ± 1.7
12.9 ± 1.7
Basal glucose (mg/dL)
HbA1c (%) (in DM)
Total Cholesterol (mg/dL)
Cardiovascular risk factors at 1-year follow-up
Remarkably, ongoing pharmacological secondary prevention strategies was the rule among the study population, with 95% of the patients receiving statins, 90% on acetylsalicylic acid, 86% on beta-blockers and 78% on ACE inhibitors or ARBs at the end of the follow-up period.
Cardiovascular risk factors distribution at the end of the 1-year follow-up period
Systolic blood pressure (mmHg)
Total Cholesterol (mg/dL)
HbA1c (%) (in DM)
7.75 ± 1.84
7.78 ± 1.91
7.68 ± 1.71
No clinical variables were associated to an inadequate control of cardiovascular risk factors, with the exception of age, which was associated with a lower probability of inadequate control of HDL-cholesterol (OR = 0.96; 95% CI: 0.94–0.99; p = 0.005) and triglycerides (OR = 0.96; 95% CI: 0.93–0.99; p = 0.003). Age was also associated with lower probability of smoking habit continuation (OR = 0.93; 95% CI: 0.89–0.98; p = 0.004).
Impact of clinical variables and risk factor control on long-term cardiovascular outcome
Baseline clinical characteristics of patients with versus without events during follow-up
(n = 61)
(n = 362)
67 ± 15
63 ± 13
Chronic kidney disease
(n = 61)
(n = 362)
46.3 ± 12.6
53.1 ± 11.3
Clinical variables associated with mortality and cardiovascular readmission in multivariate analysis
HR [CI 95%]
Killip class III-IV
LVEF > 45%
HR [CI 95%]
Killip class III-IV
LVEF > 45%
Age, sex, hypertension, anemia and Killip adjusted Hazard ratio for mortality or cardiovascular readmission for those patients with no assessed or with no controlled cardiovascular risk factors (respect to patients with controlled risk factors)
HR [CI 95%]
When only considering patients undergoing primary PCI (n = 363) or any reperfusion therapy (n = 370), the long-term adherence to secondary prevention strategies and its clinical impact were neither significantly different.
In this study it is demonstrated that the long-term efficiency of conventional secondary prevention strategies after a STEMI episode in the AMI code era (a therapeutic strategy which enhances a rapid and widespread access to urgent PCI) is manifestly suboptimal. Impressively, less than 6% of diabetic or non-diabetic patients met all the secondary prevention strategy targets at the end of the follow-up period.
Additionally, we have noted that an inadequate assessment of the LDL- and HDL-cholesterol levels is significantly associated with a less favorable long-term cardiovascular outcome after STEMI. Although no other prognostic impact of an adequate/inadequate risk factors control was demonstrated in our series, efficacy of secondary prevention strategies after a STEMI episode has been widely proven elsewhere [1–4, 9, 14–20]. It is suggested by this that an inadequate control of conventional cardiovascular risk factors after a STEMI episode may, at least partially, counterbalance the demonstrated prognostic benefits of current myocardial reperfusion strategies, such as urgent PCI [6–8, 10, 13]. Therefore, further efforts should be driven in order to enhance a more adequate accomplishment of all secondary prevention strategies after a STEMI, since these efforts should have a positive impact on the cardiovascular outcome in such patients in the long-term.
Not surprisingly, patients presenting with cardiovascular readmission or death from any cause during follow-up were older and had a higher prevalence of systemic hypertension, anemia, scored higher in Killip class classification and had lower ejection fraction. All of such conventional risk factors except for age still remain as robust predictors of a poorer cardiovascular outcome after a STEMI episode.
Long-term assessment and control of cardiovascular risk factors after STEMI
Notably, around one-sixth of our patient population did not undergo a blood test control after the index STEMI episode, with one third of the diabetic population not having glycosylated hemoglobin determinations. These figures are important and highlight the limitations of the implementation of current secondary prevention strategies among these patients. Patient education and physician awareness of this situation are some of the elements that could be implemented to decrease these poor results .
According to the current European clinical practice guidelines of secondary prevention, the current objective for LDL-cholesterol is to achieve a concentration inferior to 70 mg/dL or a reduction greater than 50% from the basal LDL-cholesterol levels [18, 19]. In our study, despite a high prescription rate of statins during follow-up, only one third of our patients reached the targeted levels. The EUROASPIRE IV (carried out in several European centers) and ADVANCE studies were undertaken in patients with stable coronary artery disease, and neither showed encouraging results [25, 26].
Previously reported European multicenter registers carried out over nearly two decades in a population of patients with CAD demonstrated that only half of the patients have their blood pressure under control despite of the high prescription rate of ACE inhibitors and beta blockers [25, 28]. These results are comparable with our observations, with only 62% of the patients having an adequate blood pressure control, besides the 20% percentage of the population with blood pressure control not being adequately assessed. Although a significant decrease in the systolic blood pressure values was established during follow-up as compared to the initial value upon hospital admission for the index STEMI episode (p < 0.001), this data has to be analyzed cautiously. The initial blood pressure value registered during an acute coronary event is not necessarily representative of the baseline patient’s blood pressure control. Furthermore, the prognostic value of high systolic blood pressure values at admission in the setting of an acute STEMI remains controversial [29–32].
The observed suboptimal metabolic control of diabetic patients is in the line of previous observations reported in series of diabetic patients undergoing by-pass surgery or PCI, with around one-half of diabetic patients having inadequate and/or insufficient long-term glycosylated hemoglobin levels control .
Smoking cessation after STEMI is associated with improved survival rates [14, 33]. Our study confirms an unacceptably high rate of smoking habit continuation, thus suggesting that further counseling strategies pursuing smoking habit withdrawal should be rendered in this setting.
Myocardial invasive reperfusion and prognosis
The implementation of the AMI code program has increased the access to urgent myocardial reperfusion to an 87% of STEMI patients, nearly all of them through PCI . This increase in the use of urgent reperfusion strategies is similar to that observed in another national multicenter register, with a reperfusion rate of 85.7% of patients, the difference being that, in the latter, one third of reperfusions were performed by means of fibrinolysis .
In our study, the 30-day mortality rate (5%) was similar to that observed in other national and international surveys in the PCI era [10, 34–39]. However, 6.1% of the STEMI 6-months survivors had deceased at the end of the 20-months (median) follow-up period, with an additional 9.9% of cardiovascular readmissions, percentages that (although low) have to be still considered suboptimal and in line with previous national series in which widespread use of urgent PCI was not yet the rule .
Our findings should make us reconsider the actual therapeutic yield of urgent myocardial reperfusion strategies in the setting of a STEMI: while the implementation of assistance networks (such as the AMI code program) has ameliorated the acute management of STEMI, the potentially beneficial impact of such strategies may be jeopardized by a suboptimal long-term implementation of the secondary prevention strategies. In the view of our results, we believe further efforts devoted to promote the cessation of smoking, periodical blood testing and blood pressure control, and to more intensively maintain LDL-cholesterol, glycosylated hemoglobin and blood pressure below the targeted levels should be undertaken. The importance of an adequate risk factors control has been highlighted also for patients with stable coronary disease, and may be specially manifest among patients with low ejection fraction and (like in our series) with a prior history of myocardial infarction .
The lack of association between cardiovascular risk factors control and cardiovascular outcome in our series is probably due to the low total number of cardiovascular events, the relatively short follow-up time and the limited sample size, reducing the statistical power of our analyses. Otherwise, dose of statins and other medication, adherence to prescribed treatment, healthy lifestyles such as diet, physical exercise, and weight control, potentially influencing the clinical outcome after a STEMI episode, were not assessed in our series due to limitations inherent to the use of the regional electronic health recording system. Finally, our single-center study may not be representative of the Spanish/European population of STEMI patients. However, its prospective nature and the consecutive inclusion appear to bestow a representative sample of real life.
Although implementation of the AMI code program has resulted in a widespread access to urgent myocardial reperfusion by means of PCI, the secondary prevention strategies after a STEMI episode are still far from being optimal, thus potentially counterbalancing the prognostic benefits of this therapy. Additional efforts to optimize the assessment and control of conventional cardiovascular risk factors should be implemented.
This work has been produced in the framework of the Doctorate in Medicine of the Universitat Autònoma de Barcelona.
This work was supported by grant from Instituto de Salud Carlos III FEDER (Programa HERACLES RD12/0042/0013).
Availability of data and material
All data generated or analyzed during this study is included in this published article and its supplementary information files.
All authors made substantial contributions to conception and design, or acquisition of data, or analysis and interpretation of data. NR, CGG, VB and RE were involved in drafting the manuscript and OM, LLR, SP, NS, JMA and JB revised it critically for important intellectual content. All authors gave final approval of the version to be published and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
The study was designed and implemented in accordance with Guidelines for Good Clinical Practice and with the ethical principles laid down in the Declaration of Helsinki.
All participants gave their written consent to participate in the study.
The study was approved by CEIC-Parc de Salut MAR with reference number 2012/4806/I.
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