Prevalence of Cardiovascular Disease in Patients with Type 2 Diabetes Mellitus in Iran: A Systematic Review and Meta-Analysis

Kazeminia, Mohsen; Salari, Nader; Mohammadi, Masoud

doi:https://doi.org/10.1155/2020/3069867

Journal of Diabetes Research

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Abstract Background Methods Results Discussion Conclusion Abbreviations Disclosure Conflicts of Interest Authors’ Contributions Acknowledgments References Copyright Related Articles

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Diabetes Mellitus and its Cardiovascular Complications: New Insights into an Old Disease 2020

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Review Article | Open Access

Volume 2020 | Article ID 3069867 | https://doi.org/10.1155/2020/3069867

Prevalence of Cardiovascular Disease in Patients with Type 2 Diabetes Mellitus in Iran: A Systematic Review and Meta-Analysis

Mohsen Kazeminia,¹Nader Salari,²and Masoud Mohammadi¹

Guest Editor: Markus Wallner

Received16 Jun 2020

Accepted31 Jul 2020

Published26 Sept 2020

Abstract

Background. Type 2 diabetes mellitus (DM) is the most common type of DM and accounts for 90% of the cases. One of the most important complications of type 2 DM is cardiovascular complications, which are the most common cause of mortality in patients with DM. Various studies have reported different incidence rates of cardiovascular disease in patients with type 2 DM. However, no comprehensive review of previous studies has been done. This study is aimed at determining the prevalence of cardiovascular disease in patients with type 2 diabetes mellitus in Iran with a systematic review and meta-analysis. Methods. In this review, studies were first extracted searching domestic and international databases including SID, MagIran, IranMedex, IranDoc, Cochrane, Embase, ScienceDirect, Scopus, PubMed, and Web of Science (ISI), published between 2001 and September 2019. The random effects model was adopted for the analysis, and heterogeneity of the extracted studies was investigated with the index. The data collected from the extracted studies were analyzed using a comprehensive meta-analysis (Version 2) software. Results. The prevalence of cardiovascular disease in patients with type 2 DM in Iran in 17 studies with a sample size of 9656 was 37.4% (95% CI: 31.4-43.8). Based on meta-regression, there was a significant difference on the effect of year of conducting the study and sample size with the prevalence of cardiovascular disease in patients with type 2 DM in Iran (). Conclusion. The results of this study indicated that there was a high prevalence rate of cardiovascular disease in patients with type 2 DM in Iran. Therefore, appropriate strategies should be taken to improve this situation and trace and supervise it at all levels, providing feedback to hospitals.

1. Background

Type 2 diabetes mellitus (DM) is the most common type of DM and accounts for 90% of the cases. The prevalence of type 2 DM is steadily increasing [1], and its incidence in children has increased approximately tenfold [2]. It is estimated that there are currently 1.5 million patients with DM in Iran [3]. In 1997, the DM prevalence rate was about 125 million, and a recent World Health Organization (WHO) estimate shows that by 2025, the number of individuals with DM in the world will increase to 300 million [4]. Although the incidence rate of type 1 and type 2 DM is increasing worldwide, it is expected that the type 2 DM will increase more rapidly due to lifestyle changes leading to decreased physical activity and increased prevalence of obesity [5, 6].

Epidemiological studies have indicated that DM has a variable distribution in Iran. In a study conducted in Isfahan on subjects aged 35 years and older, the prevalence of DM was 7-8%, and this rate was 13.6% in Bushehr and 14.52% among individuals over 30 years in urban areas of Yazd province [7]. Type 2 DM is a familial disease, and there are convincing arguments in support of this claim. Genetic factors play an important role in the development of this disease. However, many of the underlying genes for DM are still unknown, but it is known to be polygenic and multifactorial. Various genetic loci are involved in the susceptibility of developing this disease. Environmental factors (such as nutrition and physical activity) also influence its phenotypic expression [5, 8].

The incidence of type 2 DM in identical twins is between 70% and 90%, and if one of them suffers from DM, the risk of the other twin developing diabetes is 50%. People with one parent with type 2 DM are at higher risk for developing DM; and obese individuals with type 2 diabetic parents are more likely to develop type 2 DM compared to those with parents without type 2 DM. In addition to the family history, other factors such as obesity, age, ethnicity, gestational DM, hypertension, and hyperlipidemia have been all involved in DM [9, 10].

Hypertension can be an early symptom of insulin resistance due to central obesity. A secondary hypothesis is that hypertension is a marker of endothelial dysfunction, which itself is a risk factor for insulin resistance, type 2 DM, and cardiovascular diseases (CVDs) [11]. Cardiovascular disease (CVD) is the name for the group of disorders of the heart and blood vessels and includes hypertension, coronary heart disease, stroke, peripheral vascular disease, heart failure, rheumatic heart disease, congenital heart disease, and cardiomyopathies. CVDs are the number one cause of death globally and more people die annually from CVDs than from any other cause, an estimated 17.3 million people died from CVDs in 2008, representing 30% of all global deaths [10–13].

Hypertension can be observed in 70% of patients with DM, and the risk of developing DM is 2 times higher in individuals with hypertension [12].

DM, especially the type 2, is often associated with lipid metabolism disorders. Increased plasma fatty acid levels play an essential role in increasing the insulin resistance. Additionally, plasma fatty acids cause dyslipidemia in DM by increasing low-density lipoprotein (LDL) and decreasing high-density lipoprotein (HDL). This androgenic function of lipoprotein (increased triglyceride, increased LDL, and decreased HDL) causes atherosclerosis and increased risk of CVDs, which is the most common cause of death in type 2 DM [13].

The incidence of coronary artery diseases (CADs) in individuals with type 2 DM is 2- to 4-fold higher than those without DM. The risk of myocardial infarction (MI) in patients with DM with no previous history of infarction appears to be as high as that of the individuals without DM with a history of MI [14]. The most common form of dyslipidemia in patients with type 2 DM is the elevated triglyceride levels and decreased HDL cholesterol [15].

The mean LDL cholesterol concentration in patients with type 2 DM is not significantly different from that in the individuals without DM. However, there may be qualitative changes in LDL cholesterol. In particular, patients with DM have smaller and denser LDL particles which make them more easily glycosylated and susceptible to oxidation and subsequently increase their risk of cardiovascular events [15–18].

According to a study conducted by Soltani and Fardin [19] in 2005, in the city of Isfahan located in north of Iran, 20.8% of patients with DM had ischemic heart disease [19]. In another relevant study by Abbasian et al. [20], 38% of patients with DM suffered from hypertension.

Given the effect of different factors on the prevalence of CVDs in patients with type 2 DM and lack of general/reliable statistics in this regard in Iran, we performed a comprehensive review of the literature published on patients in this geographical region and analyzed the results of these studies to assess the prevalence of CVDs in patients with type 2 DM in Iran.

This study is aimed at determining the prevalence of cardiovascular disease in patients with type 2 diabetes mellitus in Iran with a systematic review and meta-analysis. The findings of this study can be used to develop more precise planning to reduce CVDs in patients with type 2 DM.

2. Methods

In this systematic review and meta-analysis study, the prevalence rate of CVDs was evaluated in patients with type 2 DM in Iran without a time limit based on the studies published between 2001 and September 2019. To this end, the studies published in the Iranian databases including SID, MagIran, IranMedex, and IranDoc as well as the international databases Cochrane, Embase, ScienceDirect, Scopus, PubMed, and Web of Science (ISI) were searched with Persian keywords and their English equivalents including Prevalence, Complications, Cardiovascular, Diabetes, and Iran.

The observational (noninterventional) studies and all available full-text articles were included in this review. For more information, the references of the reviewed studies were also examined for access to other studies.

2.1. Selection of Studies

Initially, all studies referring to the prevalence of CVDs in patients with type 2 DM in Iran were collected and accepted by researchers (MK and MM) based on the inclusion and exclusion criteria. The exclusion criteria included unrelated cases, case reports, interventional studies, duplication of studies, unclear methodology, and inaccessibility of the full text of the study. In order to reduce bias, the studies were searched independently by two researchers (MK and MM), and in case of the lack of agreement on a study, it was judged by the third researcher (NS) or supervisor. A total of 24 studies entered into the third stage, i.e., the qualitative evaluation stage.

2.2. Qualitative Evaluation of Studies

The quality of the studies was evaluated based on the selected and related items of the 22-item STROBE checklist. Accordingly, the maximum quality score of 32 was considered, and papers with a score of less than 18 were considered to have low quality, and thus, they were excluded from the study [18]. In the present study, 17 high-quality and medium-quality studies were entered into the systematic meta-analysis review, and seven studies with a poor quality were excluded.

2.3. Data Extraction

All studies finally entered into the meta-analysis process were prepared for data extraction using a preprepared checklist. The checklist included the study title, the first author’s name, year of the data collection, study location, sample size, prevalence of CVDs, and mean age.

2.4. Statistical Analysis

Since the prevalence rate had a binomial distribution, the prevalence variance was calculated using the binomial distribution variance formula and a weighted mean was applied to combine the prevalence rate of the different studies. In order to evaluate the heterogeneity of the selected studies, the index test was used. In addition, the metaregression analysis was employed to investigate the relationship between the incidences of CVDs in patients with type 2 DM, the year of performing the study, and the sample size. In order to investigate publication bias, the Begg and Mazumdar test was used with a significance level 0.1 and its corresponding funnel plot. Furthermore, the sensitivity analysis was performed to evaluate the effect of each of the studies on the final result. The data was analyzed using the comprehensive meta-analysis implemented in “Version 2” software.

3. Results

The probability of bias in the results by the funnel diagram and Begg and Mazumdar test at the significant level of 0.1 indicated that there is no bias in the present study () (Figure 1).

Based on PRISMA 2009, the studies published in the Iranian databases including SID, MagIran, IranMedex, and IranDoc and Cochrane, Embase, ScienceDirect, Scopus, PubMed, and Web of Science (ISI) were searched with Persian keywords and their English equivalents including Prevalence, Complications, Cardiovascular, Diabetes, and Iran between 2001 and September 2019. A total of 1077 articles were obtained. Subsequently, based on primary studies, after deleting 62 repetitive articles, there were 1015 articles with initial conditions to enter the study. Eventually, 17 articles were included in the meta-analysis process after secondary study with deletion of 991 unrelated articles and 7 articles which abstracts and full texts were unavailable and their quality was low (Figure 2).

The search terms were as follows: (((((Cardiovascular Diseases [Title/Abstract]) OR CARDIOVASC DIS [Title/Abstract]) OR CVD [Title/Abstract] AND Blood glucose [Title/Abstract]) OR Hyperglycemia [Title/Abstract]) AND Diabetes [Title/Abstract]) OR Non-insulin dependent diabetes [Title/Abstract]) AND Nephropathy) OR Diabetic Nephropathies))))).

Based on the results of the heterogeneity of the studies () and due to the heterogeneity of the selected studies, the random effects model was conducted to combine the studies and the joint prevalence estimation. The total sample size was 9656 individuals with the mean age of subjects in each study presented in Table 1. The lowest and the highest sample sizes were related to Soltani et al. (2011) and Janghorbani et al. (2005) with 70 and 3202 subjects, respectively; and the highest and lowest prevalence of CVDs in patients with type 2 DM in Iran were, respectively, related to the studies by Soltani and Fardin Far [19] and Abbasian et al. [20] (Table 1). According to the meta-analysis, the prevalence of CVDs in patients with type 2 DM in Iran was estimated to be 37.4% (95% CI: 31.4-43.8%) (Figure 3).

The sensitivity analysis was performed in accordance with Figure 4 to ensure the stability of the study results; after removing each study, results did not change (Figure 4).

The relationship between the year of conducting the study () and the sample size () with the prevalence of cardiovascular disease in patients with type 2 DM in Iran was investigated using the metaregression. Significant differences were observed between cardiovascular disease and the two above cases. The prevalence of cardiovascular disease in patients with type 2 DM in Iran was increased with the increase in the year of conducting the study and decreased with the increase in the sample size (Figures 5 and 6).

With increasing age of participants in the study, the prevalence of cardiovascular disease in patients with type 2 DM in Iran increases, which is statistically significant () (Figure 7).

4. Discussion

The aim of this study was to determine the prevalence of cardiovascular disease in patients with type 2 DM in Iran. DM is one of the most common diseases worldwide. The American Diabetes Association (ADA) reported that in 2007, $174 billion was spent treating patients with DM, of which $58 billion was spent to mitigate the damages due to the long-term complications of this disease [34]. This disease has an increasing trend and has been predicted to rise from 285 million in 2010 to 439 million in 2030 [36].

In the present study, the prevalence of cardiovascular disease in patients with type 2 DM in Iran was 37.4%. In the study performed by Liu et al. in China, the prevalence of CVDs in patients with type 2 DM was 30.1% [37]. In addition, in a study conducted by Shi et al. on morbidity associated with chronic complications of DM in China, CVDs were the most common chronic complication of type 2 DM [38]. The rate of cardiovascular disease in patients with type 2 DM was 26% in South Korea [39]. The results of a study in Denmark in 2010 reported a complication rate of 32 to 40% [40]. Patients with DM undergo periodic evaluation of renal and ocular complications; however, there is no specific plan to assess the related cardiovascular programs. Given the high prevalence of cardiovascular disease in patients with DM and lack of a clear plan for evaluating these complications, it is recommended that CVDs should be prevented by taking preventive measures such as regular exercise and developing cardiovascular periodic evaluation programs.

The long life and quality of life of patients with DM depend on the progression and severity of chronic complications, especially CVDs [41, 42]. The high prevalence of complications in these patients is a serious issue as these complications are not reversible and could cause damage to the organs and result in serious health problems for the patients. This could also incapacitate the patients and consequently incur heavy medical cost burden on the patients and society.

Grobbee showed that CVDs and hypertension are common problems in patients with DM; besides, obesity is one of the predisposing factors for CVDs [43]. In a report by the WHO published in 2010, obesity and overweight have been identified as the most important contributors to the rising trend of type 2 DM [44]. Moreover, numerous other studies have also suggested obesity to be the most important risk factor for type 2 DM [45–47]. Therefore, it seems that by the continuous control of the blood lipids and preventive measures to stop its increasing rate, the prevalence of type 2 DM and hence its chronic complications, especially cardiovascular disease, can be reduced in society. Adequate training on obesity and on reducing its complications is needed to be provided.

The incidence of DM and obesity has rapidly increased in the last century, and the morbidity and mortality resulting from these two epidemics have caused enormous health problems for human societies [48–51]. Type 2 DM, which is the most common type of DM, could be developed due to the presence of an inherited background as well as environmental factors as the most affecting factors [52]. In many cases, the lack of a healthy nutrition and immobility would first cause prediabetes and then diabetes emerges [53].

According to a systematic review and meta-analysis reported in Ray et al., out of 1497 cases of nonlethal myocardial infarction, 2318 cases of cardiovascular diseases, 1127 cases of stroke, and 2892 deaths, it was found that glycemic control resulted in a 17% decrease in the incidence of nonlethal MI and a 15% decrease in CADs, but with no significant effect on stroke and mortality among patients [54]. Nutrition, physical activity, glycemic control, and training of patients are the basis of DM treatment for all diabetic patients. Medical treatment should be accompanied by nutritional therapy and physical activity, in addition to considering weight loss and healthy lifestyle when choosing a suitable treatment [55, 56].

The findings in this study indicated that there is a high incidence of cardiovascular disease in patients with type 2 DM in the population under study. As a result, interventions must be performed in lifestyle changes as well as regular control of blood pressure, cholesterol, and blood glucose in patients to prevent the disease and reduce DM-related complications. Since cardiovascular diseases in patients with DM are primarily preventable and can be controlled and treated in case of developing the complication, patients with DM need thus to be fully trained about this disease and learn the ways to prevent it. Moreover, the complications can be controlled and treated with early and timely diagnosis.

Given the high prevalence of cardiovascular disease in patients with type 2 DM in Iran, it is suggested that physicians pay more attention to the symptoms of this disease and that media training should be carried out with the aim to raise the awareness of individuals to reduce the delay in diagnosis. Studies are also recommended to be carried out on the prevalence of cardiovascular disease in patients with type 2 DM in other parts of the world to find out the worldwide rate.

5. Conclusion

The results of this review revealed that there is a high prevalence rate of cardiovascular disease in patients with type 2 DM in Iran. Therefore, appropriate strategies should be taken to improve this situation and trace and supervise it at all levels, providing feedback to hospitals.

Abbreviations

DM:	Diabetes mellitus
CVDs:	Cardiovascular diseases
WHO:	World Health Organization
HDL:	High-density lipoprotein
LDL:	Low-density lipoprotein
STROBE:	Strengthening the reporting of observational studies in epidemiology for cross-sectional study
PRISMA:	Preferred reporting items for systematic reviews and meta-analysis.

Disclosure

The Deputy for Research and Technology, Kermanshah University of Medical Sciences, had no role in the design of the study; collection, analysis, and interpretation of the data; and writing of the manuscript.

Conflicts of Interest

The authors declare that they have no conflict of interest.

Authors’ Contributions

MK and NS contributed to the design; MM contributed to the statistical analysis and participated in most of the study steps. AA prepared the manuscript. MK and NS assisted in designing the study and helped in the interpretation of the study. All authors have read and approved the final manuscript.

Acknowledgments

This study was extracted from the research project no. 3008993 approved by the Student Research Committee of Kermanshah University of Medical Sciences, Kermanshah, Iran. The researchers of this study would like to appreciate the respected authorities of the university for funding the financial costs of the study. This study was supported by the Student Research Committee of Kermanshah University of Medical Sciences, Deputy for Research and Technology, Kermanshah University of Medical Sciences (IR) (3009523).

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Copyright © 2020 Mohsen Kazeminia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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