Meta-Analysis of the Effect of Traditional Chinese Medicine Compounds Combined with Standard Western Medicine for the Treatment of Diabetes Mellitus Complicated by Coronary Heart Disease

Yang, Mengqi; Cheng, Min; Wang, Min; Tang, Zhishu; Song, Zhongxing; Cui, Chunli; Liu, Yanru; Zhang, Zhen

doi:https://doi.org/10.1155/2021/5515142

Evidence-Based Complementary and Alternative Medicine

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Abstract Introduction Methods Results Discussion Conclusion Abbreviations Data Availability Conflicts of Interest Authors’ Contributions Acknowledgments References Copyright Related Articles

Review Article | Open Access

Volume 2021 | Article ID 5515142 | https://doi.org/10.1155/2021/5515142

Meta-Analysis of the Effect of Traditional Chinese Medicine Compounds Combined with Standard Western Medicine for the Treatment of Diabetes Mellitus Complicated by Coronary Heart Disease

Mengqi Yang,^1,2,3,4Min Cheng,⁵Min Wang,⁶Zhishu Tang,^1,2,3,4Zhongxing Song,^1,2,3,4Chunli Cui,^1,2,3,4Yanru Liu,^1,2,3,4and Zhen Zhang^1,2,3,4

Academic Editor: Francesca Mancianti

Received25 Feb 2021

Accepted05 Jun 2021

Published21 Jun 2021

Abstract

This study aimed to systematically evaluate the clinical efficacy and safety of traditional Chinese medicine (TCM) compounds combined with standard treatments for diabetes mellitus (DM) complicated by coronary heart disease (CHD). We performed a systematic and comprehensive search of the China Knowledge Network, WanFang, WeiPu, PubMed, and Web of Science, including Chinese and English articles, for randomized controlled trials (RCTs) assessing the use of Chinese herbal compounds for the treatment of DM complicated by CHD published before June 1, 2020. The literature was screened according to standard criteria. Risk assessment, based on the Jadad scale, was performed using the Review Manager5.3 software for meta-analysis. In total, 23 articles were selected, including 2405 cases. The meta-analysis showed that the combination of standard treatments with TCM compounds significantly improved the overall treatment efficacy for DM complicated by CHD (OR(odds ratio) = 4.39; 95% confidence interval (95% CI), 3.30–5.84; ), fasting blood glucose level (mean difference (MD) = −1.04; 95% CI, −1.96 to −0.13; ), total cholesterol level (MD = −1.16; 95% CI, −1.48 to −0.83; ), triglyceride (MD = −0.46; 95% CI, −0.62 to −0.29; ), low-density lipoprotein level (MD = −0.57; 95% CI, −0.87 to −0.27; ), high-density lipoprotein level (MD = 0.19; 95% CI, 0.12 to 0.26; ), and electrocardiogram (OR = 4.20; 95% CI, 3.15 to 8.18; ). In contrast, there was no improvement of 2-hour postprandial glucose level (MD = −1.03; 95% CI, −2.14 to 0.08; ), or adverse reactions (OR = 0.53; 95% CI, 0.19 to 5.50; ). We concluded that the combined therapy has some benefits in treating DM complicated by CHD. However, these results should be confirmed by further referenced evidence, high risk assessment, and lower publication bias.

1. Introduction

Diabetes mellitus (DM) is a metabolic disorder characterized by hyperglycemia [1]. Its etiology is complex and related complications severely threaten human health. Both coronary heart disease (CHD) and DM are common clinical conditions. Coronary atherosclerotic heart disease is referred to as coronary artery disease, which leads to stenosis or occlusion of the artery lumen and eventually to myocardial ischemia [2]. Studies have shown that type 2 DM (T2DM) is associated with higher risk of CHD [3]. The pathological basis of CHD is myocardial ischemia, hypoxia, or necrosis caused by coronary atherosclerosis. DM is one of the risk factors for premature arteriosclerosis and can further contribute to the deterioration of CHD. Data showed that diabetic patients are four times more likely to develop cardiovascular disease than nondiabetic patients [4]. DM complicated by CHD often leads to multiple organ damage, seriously reducing the quality of life of the patients, and it can even be life threatening [5]. Clinical treatment of DM complicated by CHD mainly aims at improving myocardial blood supply and controlling blood glucose through the use of antiplatelet aggregation, anticoagulation, antiperoxidation, antihypertension, blood lipid regulation, thrombolysis, bypass grafting, and arterial interventional therapy. However, these strategies require long-term therapy, only have a single target, and associated with poor patient compliance with the drug regimen, adverse drug reactions, and poor prognosis, which leads to poor overall clinical efficacy [6]. In traditional Chinese medicine (TCM) theory, CHD and DM are classified as “chest arthralgia”, “heartache,” and “thirst elimination” [7].

The main clinical manifestation of CHD is angina pectoris, often accompanied by panic, shortness of breath, and fatigue. Ancient medical books recorded a lot of prescriptions for the treatment of chest arthralgia, including Wenyang Ton gmai, Yiqi Shengxue, Yangyin Shengmai, and other conventional prescriptions. TCM diagnosis criteria of DM is lung heat injury and fire-flourishing Yin deficiency, often calling for Xiaoke Fang and Qingwei San dialectical treatments [8]. Recently, the scientific literature reported that TCM compounds can exert certain therapeutic effects on DM and CHD [9]. A study by Zhang et al. [10] showed that Western medicine basic therapy supplemented by Yiqi Yangyin Huoxue decoction provides a better treatment for DM complicated by CHD than Western medicine used alone, and it could increase the curative effects of Western medicine. Another study by Zou [11, 12] showed that the addition of Yixinshu capsules can relieve symptoms in patients suffering from T2DM-related CHD angina pectoris, enhance exercise tolerance, reduce blood glucose level, and the capsule is safe, effective, and easily tolerated. Finally, addition of Pingxiaotongxin capsules added to standard treatment can also alleviate patient symptoms and reduce their blood glucose level. However, there is still insufficient evidence supporting the use of these TCM compounds. To fill this gap, we sought to provide statistics-based evidence as reference for the clinical application of TCM by performing a systematic meta-analysis comparing the efficacy of Western standard therapy used alone (control group) or in combination with TCM compounds (observation group) for the treatment of DM complicated by CHD.

2. Methods

2.1. Inclusion Criteria

The patients included in this study met the diagnostic criteria for CHD established by the Ministry of Health of the People's Republic of China and the diagnostic criteria for DM published by the World Health Organization in 2019. Only publications in English or Chinese were included. The included study’s indicators of efficacy included at least total efficiency or blood glucose levels.

2.2. Exclusion Criteria

Excluded documents included literature reviews, meta-analyses, studies in animal models, duplicate publication, and retrospective studies, such as clinical studies designed without a control group or case reports.

2.3. Intervention

For inclusion of a study, the control group had to be treated with standard Western medicine protocol, and the observation group had to be treated with the same standard Western medicine protocol as the control group, in combination with TCM compounds. The specific dosage and time of administration were not clearly defined.

2.4. Evaluation Indicators

The clinical indicators included total effective rate, levels of fasting blood glucose, postprandial 2-hour plasma glucose, total cholesterol, triglycerides, high-density lipoprotein cholesterol, and low-density lipoprotein cholesterol, as well as frequency of angina attacks and the duration of angina pectoris pain.

2.5. Search Strategies

We searched the China National Knowledge Infrastructure (CNKI), WanFang, the Cochrane Library, and CBM (documents collected from January 2000 to February 2020) on traditional Chinese medicine compounds combined with standard Western medicine for the treatment of DM complicated by coronary heart disease. The language of the text was limited to Chinese and English. Theme for database searching were “Chinese medicine compound,” “DM with coronary heart disease,” and “randomized control”.

2.6. Data Extraction and Risk Assessment

In total, 23 articles were selected and cross-checked by two researchers. The controversial content or the score of the article was determined by one-third person after careful assessment. Collected information included the author names, year of publication, the numbers of cases, methodological characteristics, outcome measures, adverse events, and follow-up records. These data were separately collected and cross-checked by two researchers. The controversial content was determined by one-third person after careful assessment. Risk assessment was based on the Jadad scale. The specific points for the evaluation included randomization scheme (2 points), blind mode (2 points), and exit and missing visit (1 point). Based on the score, the articles were classified as low quality (0–2 points), medium quality (3–4 points), and high quality (5 points).

2.7. Statistical Analysis

The meta-analysis was performed using the Cochrane Collaboration’s software RevMan 5.3. Heterogeneity was assessed by means of I² statistics. The fixed effect model was used to analyze data with low heterogeneity. The random effects model was used to analyze the data with I² >50%, representing high heterogeneity. Outcome measures, such as total efficiency rate (TER) and adverse events (AEs) as dichotomous variables, were analyzed using odds ratio (OR) values with 95% confidence interval (95% CI). Continuous data are presented as weighted mean difference (MD) with a 95% CI. Funnel plots were used to analyze publication bias.

3. Results

3.1. Literature Retrieval

In total, 23 randomized controlled trials (RCTs) were selected, including 2405 cases. The article screening process and results are shown in Figure 1.

3.2. Incorporation of the Basic Features of the Literature

Based on the above literature screening process, 23 RCTs were selected finally, gathering a total of 2405 samples, including 1219 were in the observation groups and 1186 were in the control groups. The demographic baseline indicators were not statistically different and comparable across the different studies. Specific information is reported in Table 1.

3.3. Document Evaluation

Based on the Jadad scale, the 23 articles were evaluated systematically from the aspects of “randomization mode,” “blind method strategy,” and “exit and missing visits.” Regarding the randomization mode, in the studies, Ye [17], Li and Shang [31], Guan and Shang [19], Xing et al. [18], Zhang and Zhang [16], Yan et al. [28], He [32], and Sun et al. [24] used the random number table method to perform a random grouping, which corresponds to a standard grouping mode and gave a 2-point assignment. Zhang [15] used a random allocation method, Zhang [13] used a random group method, and Zhang [27] used a file sequence all corresponding to “pseudorandomization” methods and that gave 0-point assignment. In the other selected articles [14, 20–23, 25, 26, 29–31, 33–35], no randomization method was specified, and 0 point were assigned. None of the selected studies had implemented a blinding procedure, and therefore, all scored 0. Studies that did not have any dropout or lost follow-up were assigned 1 point. Based on the above scoring, only 8 of the 23 selected articles reached a medium quality (3 points), whereas the other articles were of low quality (1 point). The overall article evidence level was low, and the error risk was high, as shown in Table 2.

3.4. Meta-Analysis

3.4.1. Total Clinical Efficiency

A total of 1785 participants were reported in 20 studies with no statistical between-study heterogeneity (I² = 0%; ). Therefore, a meta-analysis of the data from these 20 studies was performed according to the fixed effect model. The results of the comparison between standard treatments alone and standard treatment combined with TCM compounds showed that the TCM compounds improved the overall clinical efficiency of treatment for DM complicated by CHD (OR = 4.20; 95% CI, 3.21–5.50; ; Figure 2).

3.4.2. Fasting Blood Glucose (FBG) Level

The FBG levels were reported for a total of 832 participants across 11 studies that were statistically heterogeneous (I² = 99%; ). Therefore, the meta-analysis of the data was performed using the random effects model. The results showed that addition of TCM compounds to standard treatments reduced the FBG levels (MD = −1.02; 95% CI, −1.87 to −0.17; ; Figure 3).

3.4.3. Two-Hour Plasma Glucose (2hPG)

The 2hPG levels were reported for a total of 621 participants across 8 studies that presented with statistical between-study heterogeneity (I² = 99%; ). Therefore, the meta-analysis of the data was performed using the random effects model. The comparison between standard treatments alone and standard treatments combined with TCM compounds showed that the addition of the TCM compounds to the therapy had no effect on 2hPG levels (MD = −1.07; 95% CI, −2.09 to −0.08; ; Figure 4).

3.4.4. Total Cholesterol

Total cholesterol levels were measured for a total of 1490 participants across 13 studies presented with statistical between-study heterogeneity (I² = 98%; ). Therefore, the meta-analysis of the data was performed using the random effects model. This analysis showed that TCM compounds combined with standard treatments ameliorated the total cholesterol levels of the patients suffering from DM complicated by CHD complications, compared with standard treatments used alone (MD = −1.16; 95% CI, −1.48 to −0.83; ; Figure 5).

3.4.5. Triglycerides

Triglyceride levels were reported for a total of 1374 participants in 12 studies. The statistical heterogeneity of the results from these studies (I² = 94%; ). Therefore, the meta-analysis of the data was performed using the random effects model. The addition of TCM compounds to standard treatments resulted in a beneficial effect on triglyceride levels (MD = −0.46; 95% CI, −0.62 to −0.29; ; Figure 6).

3.4.6. Low-Density Lipoprotein (LDL-C)

LDL-C levels were reported for a total of 1274 participants in 11studies. These studies had statistically heterogeneous results (I² = 96%; ). Therefore, the meta-analysis of the data was performed using the random effects model. The addition of the effect of TCM compounds to standard treatments resulted in a beneficial effect (MD = −0.57; 95% CI, −0.87 to −0.27; ; Figure 7).

3.4.7. High-Density Lipoprotein (HDL-C)

HDL-C levels were reported for a total of 1374 participants in 12 studies were statistically heterogeneous (I² = 51%; ). Therefore, the meta-analysis was performed using the random effects model. The addition of TCM compounds to standard treatments resulted in a beneficial effect (MD = 0.19; 95% CI, 0.12 to 0.26; ; Figure 8).

3.4.8. Effect on Electrocardiogram

Electrocardiograms were reported for a total of 556 participants across 6 studies with no statistical between-study heterogeneity (I² = 22%; ). Therefore, the meta-analysis of the data was performed using the fixed effect model. The addition of TCM compounds to standard treatments resulted in a beneficial effect on the electrocardiograms (OR = 4.20; 95% CI, 3.15 to 8.18; ; Figure 9).

3.4.9. Safety Assessment of TCM Compounds

Safety assessment of TCM compounds was performed in 3 studies with no statistical between-study heterogeneity (I² = 14%; ) including a total of 283 participants. A meta-analysis of the data from these three studies was performed using the fixed effect model. The use of TCM compounds combined with standard treatments was not associated with significant difference in the adverse effects recorded (OR = 0.53; 95% CI, 0.19 to 5.50; ; Figure 10).

3.4.10. Publication Bias Analysis

Publication bias on the outcome of clinical efficiency and electrocardiograms in the publications included in this study was analyzed according to the pooled qualitative (funnel plot) method. Using the log (OR) as boundary, the studies were asymmetrically distributed between the left- and right-hand sides, indicating a publication bias. (Figure 11).

4. Discussion

With lifestyle changes, urbanization and aging of the population, cardiovascular diseases, and cancer have become the leading causes of death in Chinese adults [10]. The prevalence of DM and prediabetes in Chinese adults are 9.7% and 15.5%, respectively. CHD and DM have become major public health problems. There is an interaction between DM and cardiovascular diseases. The risk of cardiovascular events in diabetic patients is nearly twice as high as in nondiabetic patients [36]. Data showed that about 75% of the deaths occurring in DM patients are associated with coronary artery diseases [37]. The results of the European Heart Survey also showed that about two-thirds of the CHD cases are associated with glucose metabolism disorders. Therefore, the treatment of DM complicated by CHD is an important issue.

Standard treatments mostly included oral hypoglycemic drugs or insulin to control blood glucose levels in addition to the management of lifestyle factors, such as diet, exercise, and weight control. However, DM requires long-term continuous control, patient compliance is poor, and the results of these therapeutic strategies are not satisfactory. DM with CHD is classified in the “Xiaoke” and “chest arthralgia” category in TCM theory. The disease is mainly caused by Qi Yin deficiency. Qi and blood stasis caused by the heart pulse are insuperable. Qi deficiency leads to weak blood flow, blood stasis, long-term heat accumulation, and heat injury, provoking further inside blood stasis [38]. Western medicine uses nitrates for the treatment of CHD symptoms, but drug resistance occurs during the treatment of DM, when the use of hypoglycemic drugs increases the load on the heart. The combination of these two types of drugs, which represent an almost life-long treatment, seriously reduces patients’ quality of life [39]. Many studies have shown that Chinese herbal compounds can be used to successfully treat CHD. These not only improve clinical efficiency but also relieve FBG, total cholesterol, triglyceride, LDL-C, and 2hPG levels, and other DM indices to some extent.

The meta-analyses we performed showed some limitations of the evaluation system: (1) some publication bias was detected; (2) the overall quality of the included studies was low; (3) there was a lack of objective unified criteria for the determination of clinical efficacy; (4) the control groups received different treatments; and (5) all the studies were published in Chinese.

The results of the analysis could be biased. Although there are some limitations in TCM due to the lack of basic research, evidence-based practices that may be effective make it an attractive treatment system for many diseases. The accuracy of the meta-analysis results depends on the article selection. Therefore, the requirements for future experiments should be multicenter, large sample, randomized, control, and double-blind allocation hidden experiment. These requirements suggest that clinical trials have to further improve their scientific value, strictly control the implementation of standards, provide clearer and more detailed descriptions of randomization, blind test, and more particularly, improve the quality of the testing methodology and standardize the clinical RCT reports, such that they can provide more effective information for clinical applications.

5. Conclusion

Of the 23 publications included in this study, 20 reported information on clinical comprehensive efficiency, 11 reported information on FBG levels, 13 reported information on total cholesterol levels, 12 reported information on triglyceride levels, 11 reported information on LDL-C levels, and 11 reported information on HDL-C levels. All of these parameters were statistically improved by the use of TCM compounds.

In summary, based on current evidence, we conclude that combined therapy could increase the clinical total effective rate and reduce FBG, total cholesterol, and HDL-C levels. There was no evidence showing that combination therapy would lead to safety problems. A number of sensitivity analyses have shown that our conclusions are robust.

After evaluating the quality of the articles included in the present meta-analysis, we found that most articles were of low quality, which is the main limitation of our study. International methodologies and rigorous RCTs can produce better tests. Therefore, in order to evaluate the clinical efficacy of TCM and provide a strong scientific basis for the development of TCM, more high-quality studies are needed to provide more reliable data for meta-analysis.

Abbreviations

AE:	Adverse event
CHD:	Coronary heart disease
DM:	Diabetes mellitus
FBG:	Fasting blood glucose
HDL-C:	High-density lipoprotein-cholesterol
LDL-C:	Low-density lipoprotein-cholesterol
MD:	Mean difference
OR:	Odds ratio
RCT:	Randomized controlled trial
TCM:	Traditional Chinese medicine
TER:	Total efficiency rate
T2DM:	Type 2 diabetes mellitus
2Hpg:	2-Hour plasma glucose.

Data Availability

All the data generated or analyzed during this study are included in this published article.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Authors’ Contributions

Mengqi Yang, Min Wang, and Zhishu Tang designed the study and provided general guidance for the drafting of the protocols. Mengqi Yang and Zhongxing Song drafted the protocol. Min Wang, Zhishu Tang, and Zhongxing Song designed the search strategy. Mengqi Yang, Chunli Cui, and Min Wang drafted the manuscript. Chunli Cui, Min Cheng, and Yanru Liu reviewed and revised the manuscript. All the authors have read and approved the final version of the manuscript.

Acknowledgments

The authors thank LetPub (http://www.letpub.com) for its linguistic assistance during the preparation of this manuscript. This project was supported by the National Science and Technology Major Project grant (2019ZX09301-133); the National Modern Agricultural Industrial Technology System Construction Special Project grant (CARS-21); and a key project grant obtained from the Central Government: the ability establishment of sustainable use for valuable Chinese medicine resources (2060302).

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