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New onset diabetes mellitus and cardiovascular events in Korean patients with acute myocardial infarction receiving high-intensity statins

BMC Pharmacology and Toxicology volume 22, Article number: 11 (2021) Cite this article

Abstract

Background

High-intensity statin therapy is typically used in patients with acute myocardial infarction (AMI) for secondary prevention. However, there have been consistent concerns regarding its association with diabetes mellitus. We investigated the effect of high-intensity atorvastatin and rosuvastatin on new-onset diabetes mellitus (NODM) and cardiovascular outcomes over a 3-year follow-up period.

Methods

Data from the Korea Acute Myocardial Infarction Registry were collected from November 2011 to October 2015, and 13,104 patients with AMI were enrolled from major cardiovascular centers. Among them, 2221 patients without diabetes who had been administered with high-intensity atorvastatin (40–80 mg) and rosuvastatin (20 mg) were investigated. The atorvastatin and rosuvastatin groups were evaluated for the incidence of NODM and major adverse cardiac events (MACE) including death, myocardial infarction, and revascularization cases in the following 3 years.

Results

Baseline characteristics were comparable between the two groups. Event-free survival rate of NODM was not significantly different between the atorvastatin and rosuvastatin groups (92.5% vs. 90.8%, respectively; Log-rank P-value = 0.550). The event-free survival rate of MACE was also not significantly different between atorvastatin and rosuvastatin groups (89.0% vs. 89.6%, respectively; Log rank P-value = 0.662). Multivariate Cox analysis revealed that statin type was not a prognostic factor in the development of NODM and MACE.

Conclusions

Administering high-intensity atorvastatin and rosuvastatin in patients with AMI produced comparable effects on NODM and clinical outcomes, suggesting their clinical equivalence in secondary prevention.

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Background

Statins typically prevent cardiovascular events by lowering total and low-density lipoprotein (LDL) cholesterol levels in the serum. Considering their rapid and sustained clinical advantages, the current guideline recommends administration of high-intensity statins in patients with acute myocardial infarction (AMI) for secondary prevention. However, there has been consistent concern regarding its association with new-onset diabetes mellitus (NODM) [1]. Clinical trials, meta-analyses of randomized controlled trials (RCTs), and observational studies have demonstrated a 10–12% increase in NODM among patients receiving statins [2, 3]. Meta-analysis of five large-scale trials comparing intensive and moderate doses of statins have demonstrated that the risk of NODM further increases in intensive therapy groups [4]. However, it is unclear if the diabetogenic effect of statins is a class effect. Considering their crucial role of secondary prevention in patients with AMI, it would be important to identify the diabetogenic and cardioprotective effects of high-intensity statins. In Korea, atorvastatin 40–80 mg and rosuvastatin 20 mg are currently available as high-intensity statins for clinical use. Here, we investigated the effect of high-intensity atorvastatin and rosuvastatin on cardiovascular outcomes and NODM in patients with AMI over a 3-year follow-up period.

Methods

Data collection and study population

The Korea Acute Myocardial Infarction Registry (KAMIR), a Korean prospective, multicenter, nationwide database supported by the Korean Society of Cardiology, reflects real-world clinical practices of AMI patients in Asian. Twenty university or community hospitals have participated in the registry. Data collection at each institution level is performed by a study coordinator using a standardized case report form and the collected data are managed using web-based systems. The study was approved by the ethics committee at each institution. All the patients enrolled the study provided written informed consent.

A total of 13,104 patients with AMI were enrolled in the KAMIR registry from November 2011 to October 2015. Among them, 6728 patients without a diagnosis of diabetes mellitus (DM) at enrollment, with a successful percutaneous coronary intervention (PCI) with drug-eluting stent implantation and high-intensity statin treatment were eligible for our study. Patients were selected considering the following exclusion criteria: history of DM or initial HbA1c level ≥ 6.5%, PCI with bare metal stent implantation or plain old balloon angioplasty. Additionally, we did not include patients with failed PCI, or in-hospital major adverse cardiac events (MACE). Finally, 2221 patients with AMI treated with high-intensity atorvastatin or rosuvastatin, according to 2014 ACC/AHA Release Updated Guideline, were analyzed in the study. Of them, 60.7% (1349/2221) of patients had received 40–80 mg atorvastatin and 39.3% (872/2221) had received 20 mg rosuvastatin (Fig. 1).

Fig. 1
figure 1

Patient flow chart. AMI: Acute myocardial infarction, DM: diabetes mellitus, KAMIR: Korea Acute Myocardial Infarction Registry, MACE: major adverse cardiac events, PCI: percutaneous coronary intervention, POBA: plain old balloon angioplasty

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Clinical outcome and definition

The primary endpoint was the incidence of NODM and the incidence of MACE during the 3 years of clinical follow-up. Secondary endpoints were each component of MACE, reasons for mortality, MI, and revascularization. NODM was defined as an HbA1c level ≥ 6.5% or new administration of oral hypoglycemic agents. The patients’ clinical data were obtained by face-to-face interviews during regular outpatient visits, medical chart reviews, and telephonic interviews.

Statistical analysis

For continuous variables, differences between the two groups were analyzed by Student’s t-test. Data were presented as mean ± standard deviation (SD). For discrete variables, differences were analyzed using the Chi-square test or Fisher’s exact test and presented as counts and percentages. The cumulative incidence of NODM and MACE was calculated using the Kaplan–Meier method, and the intergroup differences were analyzed using the log-rank test. Cox-proportional hazard models reporting hazard ratio (HR) and 95% confidence interval (CI) was performed to identify potential prognostic factors for NODM and MACE. For multivariate analysis, variables with significant P-values (< 0.05) in the univariate analysis were included. For all analyses, a P-value < 0.05 was considered statistically significant. The data were analyzed using SPSS (version 22.0, Inc. Chicago, IL).

Results

Baseline characteristics

Baseline clinical, laboratory, and angiographic characteristics are demonstrated in Table 1. We did not observe any significant intergroup differences with regard to age, gender, LV systolic function, incidence of STEMI, and underlying diseases such as hypertension and cerebrovascular accidents. Patients in the rosuvastatin group had higher levels of LDL cholesterol and peak CK-MB and a longer total stent length than those in the atorvastatin group. Dual antiplatelet therapy (DAPT) rate was above 99% in both groups; however, the composition of DAPT was different in that the prescription rate of prasugrel was higher in the atorvastatin group and that of ticagrelor was higher in the rosuvastatin group. Numbers of patients taking ACEi or ARB and β blockers were higher in the atorvastatin group than in the rosuvastatin group.

Table 1 Baseline clinical characteristics and angiographic and procedural characteristics
Full size table

Clinical outcomes

The cumulative incidence of NODM up to 3 years using Kaplan-Meier method is presented in Fig. 2a and Table 2. There was no significant difference in the event-free survival rate of NODM between the atorvastatin and rosuvastatin groups (92.5% vs. 90.8%, respectively; Log-rank P-value = 0.550). Kaplan–Meier curves for the cumulative incidence of MACE up to a period of 3 years are presented in Fig. 2b and Table 2. There was no significant difference between the atorvastatin and rosuvastatin groups regarding the event free survival rate of MACE (89.0% vs. 89.6%, respectively; Log rank P-value = 0.662), reasons for mortality, myocardial infarction, and revascularizations. Comparing 40 mg and 80 mg of atorvastatin groups with 20 mg of rosuvastatin group revealed no significant differences in the event-free survival rate of NODM and MACE (see Additional file 1: Fig. S1A and B).

Fig. 2
figure 2

Kaplan–Meier curves for event-free survival rate of new-onset diabetes mellitus (a) and major adverse cardiac events (b) according to statin type

Full size image
Table 2 Cardiovascular Outcomes at 3 Years
Full size table

Potential prognostic factors for NODM were identified via univariate Cox regression analysis. Higher random glucose and triglyceride levels were both significant prognostic factors for NODM in univariate and multivariate analysis. However, the type of statin used was not (HR = 1.098, 95% confidence interval [CI]: 0.808–1.491, P = 0.551, Table 3). Conventional risk factors including older age, lower left ventricular ejection fraction (LVEF), and higher creatinine levels were associated with a higher incidence of MACE. Use of new antiplatelet agents such as ticagrelor or prasugrel was a significant prognostic factor in univariate analysis, not however, in the multivariate analysis. The type of high-intensity statin, atorvastatin or rosuvastatin, was not a potential prognostic factor for MACE (HR = 0.944% confidence interval [CI]: 0.727–1.225, P = 0.662, Table 3).

Table 3 Cox regression of clinical outcome
Full size table

Discussion

To the best of our knowledge, this is the first study to investigate the effect of high-intensity statin treatment on the development of NODM and MACE in Korean patients with AMI. Our results indicated that high-intensity atorvastatin and rosuvastatin therapies showed no significant difference with regard to the incidence of NODM and cardiovascular events.

Statins reduce serum LDL cholesterol level and the risk of cardiovascular events. As numerous studies revealed that the degree of cardiovascular risk reduction is proportional to the statin intensity [5, 6], the current guidelines strongly recommend high-intensity or maximally tolerated intensity statin therapy in patients with AMI in the absence of contraindications [7, 8]. However, several studies have suggested that statins increase the incidence of NODM [3, 9]. The issue has started attracting attention since the Justification for the Use of Statin in Prevention: An Intervention Trial Evaluating Rosuvastatin (JUPITER) trial revealed a higher incidence of NODM in rosuvastatin treated patients for primary prevention than in patients with placebo [10]. Numerous observational studies [11, 12] and meta-analyses of major RCT [3, 13] have consistently reported an increased incidence of NODM in patients treated with statin. In Korea, a population-based cohort study using the Korean National Health Insurance claims database has shown an increased incidence of NODM in statin-treated groups [2].

Whether the diabetogenic effect of statin is a class effect has been a controversial subject. Typically, atorvastatin and rosuvastatin are thought to unfavorably influence glycemic parameters, while pitavastatin and pravastatin have relatively neutral effects on glycemic control regardless of the presence or absence of DM [1]. Our group recently published a report regarding the favorable glycemic effects of moderate-intensity pitavastatin in comparison to those of moderate-intensity atorvastatin and rosuvastatin in patients with AMI [14]. Despite the current guidelines recommending high-intensity or maximally tolerated statin for secondary prevention in patients with AMI [7, 8], there is no study, to the best of our knowledge, that has compared the diabetogenic effects of different high-intensity statins.

Several studies were conducted regarding the cardiovascular outcomes after high-intensity statin therapy. In patients with acute coronary syndrome, both the atorvastatin and rosuvastatin groups had comparable effects on lipid parameters [15, 16], although patients with familial hypercholesterolemia in the rosuvastatin group demonstrated a greater reduction in LDL cholesterol levels than those in the atorvastatin group [17]. Some studies have reported more favorable effects of rosuvastatin on reducing atherosclerotic plaque volume [15, 18] and plaque stabilization [15] than of atorvastatin; however, there has been no significant difference with regard to the cardiovascular outcome in both groups [17, 19]. In line with these previous studies, we could not identify the differences between the effects of high-intensity atorvastatin and rosuvastatin administration on major cardiovascular events.

Several studies have suggested the possible mechanisms underlying the effect of statin on glucose metabolism. Some studies have suggested the interconnection between glucose and lipid metabolisms by demonstrating gene variants affecting glucose metabolism [20,21,22], cholesterol-dependent conformational change in glucose transporter protein [23], or deleterious effect on islet β cells [24] by statins. There is a scarcity of data regarding the mechanisms underlying the different diabetogenic effects of statins; hence, further study would be needed.

This study has several limitations. First, our study is not an RCT, which inevitably leads to selection bias and an imbalance in baseline characteristics. However, as KAMIR is a prospective registry that enrolls Korean patients with AMI, it can represent real-word clinical data. Second, there is a lack of data on rosuvastatin 40 mg and a relatively small number of patients have been treated with atorvastatin 80 mg; hence, dose-dependent increases in NODM could not be demonstrated in our study. Third, this study lacks data regarding the compliance of statin during the follow-up period. Most conventional variables such as age, LVEF, renal function, and new antiplatelet agents were shown to be significant prognostic factors for cardiovascular outcomes, but RAS blockers and β blockers were reported as modest and insignificant prognostic factors, respectively. Despite its limitations, to the best of our knowledge, this is the first study from a multicenter registry that demonstrated detailed real-world data on the effect of high-intensity statin on incidence of NODM and MACE in patients with AMI.

Conclusions

In conclusion, high-intensity atorvastatin therapy showed similar incidence of NODM and cardiovascular events when compared with high-intensity rosuvastatin therapy in patients with AMI. Although prospective, randomized trials with a larger study population are needed to clarify our results, the outcomes presented here provide supportive evidence for the diabetogenic and cardioprotective effects of high-intensity statins in patients with AMI.

Availability of data and materials

The datasets generated and/or analysed during the current study are not publicly available because it is confidential, but are available from professor Myung Ho Jeong on reasonable request.

Abbreviations

AMI:

acute myocardial infarction

KAMIR:

Korea Acute Myocardial Infarction Registry

LDL:

low-density lipoprotein

MACE:

major adverse cardiac events

NODM:

new-onset diabetes mellitus

PCI:

percutaneous coronary intervention

RCT:

randomized controlled trial

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Acknowledgements

This study was done with the support of Korean Circulation Society (KCS). The KAMIR study group of the KSC was as follows: Woong Chol Kang, Gachon University Gil Medical Center, Incheon; Kiyuk Chang, Catholic University Hospital, Seoul; Seung Ho Hur, Keimyung University Dongsan Medical Center, Daegu; Seung Woon Rha, Korea University Guro Hospital, Seoul; Kwang-Soo Cha, Pusan National University Hospital, Busan; Hyeon Cheol Gwon, Samsung Medical Center, Seoul; Seok Kyu Oh, Wonkwang University Hospital, Iksan; Jei Keon Chae, Chonbuk National University Hospital, Jeonju; Kyung-Kook Hwang, Chungbuk National University Hospital, Chungju; Chong Jin Kim, East West Neo Medical Center, Seoul; Jung Han Yoon, Wonju Severance Christian Hospital, Wonju; Jin Yong Hwang, Gyeongsang National University Hospital, Jinju; Doo Il Kim, Inje University Busan Paik Hospital, Busan; Seung Jae Joo, Jeju National University Hospital, Jeju.

We would like to thank Editage (www.editage.co.kr) for English language editing.

Funding

This research was supported by a fund (2016-ER6304–02) by Research of Korea Centers for Disease Control and Prevention.

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Authors and Affiliations

  1. Cardiovascular Center, Korea University Guro Hospital, 80, Guro-dong, Guro-gu, Seoul, 152-703, Republic of Korea

    Jah Yeon Choi, Cheol Ung Choi, Byoung Geol Choi, Yoonjee Park, Dong Oh Kang, Woohyeun Kim, Jin Oh Na, Jin Won Kim, Eung Ju Kim, Seung-Woon Rha, Chang Gyu Park & Hong Seog Seo

  2. Cardiovascular Center, Catholic University of Korea St. Vincent Hospital, Suwon, Republic of Korea

    Won Young Jang

  3. Chonnam National University Hospital, Gwangju, Republic of Korea

    Myung Ho Jeong

  4. Kyungbook National University Hospital, Kyungbook National University School of Medicine, Daegu, Republic of Korea

    Sung-Chull Chae

  5. Chungnam National University Hospital, Daejeon, Republic of Korea

    In-Whan Seong

  6. Seoul National University Bundang Hospital, Seongnam, South Korea

    Chang-Hwan Yoon

  7. Pusan National University Hospital, Busan, South Korea

    Kwang Soo Cha

  8. Wonkwang University School of Medicine, Iksan, Korea

    Seok Kyu Oh

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  1. Jah Yeon Choi
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Consortia

KAMIR-NIH Investigators

  • Woong Chol Kang
  • , Seung Woon Rha
  • , Kwang-Soo Cha
  • , Hyeon Cheol Gwon
  • , Seok Kyu Oh
  • , Jei Keon Chae
  • , Kyung-Kook Hwang
  • , Chong Jin Kim
  • , Jung Han Yoon
  • , Jin Yong Hwang
  • , Doo Il Kim
  •  & Seung Jae Joo

Contributions

JYC: conception and design of the work, acquisition/analysis/interpretation of data, writing- Original draft preparation, BGC: acquisition/analysis/interpretation of data, YP, DOK, WYJ, and WK: acquisition/analysis of data, JON, JWK, EJK, SWR, CGP and HSS: acquisition of data, MHJ, SCC, IWS, CHY, KSC, SKO: conception of the work, acquisition of data, CUC: conception and design of the work, supervision, reviewing and editing, acquisition/analysis of data. The author(s) read and approved the final manuscript.

Corresponding author

Correspondence to Cheol Ung Choi.

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Ethics approval and consent to participate

This study was approved by the Institutional Review Board of Korea University (IRB No. 2016GR0740) and the Institutional Review Board of each participating hospital. All participants provided written informed consent. Permission to analyze the data was also granted by KAMIR-NIH registry executive.

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Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Choi, J.Y., Choi, C.U., Choi, B.G. et al. New onset diabetes mellitus and cardiovascular events in Korean patients with acute myocardial infarction receiving high-intensity statins. BMC Pharmacol Toxicol 22, 11 (2021). https://doi.org/10.1186/s40360-021-00476-z

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Keywords

  • Acute myocardial infarction
  • New-onset diabetes mellitus
  • Cardiovascular outcome
  • Atorvastatin
  • Rosuvastatin

BMC Pharmacology and Toxicology

ISSN: 2050-6511

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