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Diabetes Therapy

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Open Access 19.05.2018 | Original Research

Cardiac Versus Non-Cardiac Related Mortality Following Percutaneous Coronary Intervention in Patients with Insulin-Treated Type 2 Diabetes Mellitus: A Meta-Analysis

verfasst von: Qiang Wang, Hao Liu, Jiawang Ding

Erschienen in: Diabetes Therapy | Ausgabe 3/2018

Abstract

Introduction

Cardiovascular mortality is a major concern for patients with type 2 diabetes mellitus (T2DM). Insulin therapy significantly contributes to a high rate of death in these patients. We have performed a meta-analysis comparing cardiac and non-cardiac-related mortality following percutaneous coronary intervention (PCI) in a sample of patients with insulin-treated type 2 diabetes mellitus (ITDM).

Methods

Studies were included in the meta-analysis if: (1) they were trials or cohort studies involving patients with T2DM post-PCI; (2) the outcomes in ITDM were separately reported; and (3) they reported cardiac death and non-cardiac death among their clinical endpoints. ITDM patients with any degree of coronary artery disease were included. The analysis was carried out using RevMan version 5.3 software, and data were reported with odds ratios (OR) and 95% confidence intervals (CI) as the main parameters.

Results

A total of 4072 participants with ITDM were included, of whom 1658 participants and 2414 participants were extracted from randomized controlled trials and observational cohorts, respectively. Analysis of all data showed that death due to cardiac causes was significantly higher in patients with ITDM (OR 2.16, 95% CI 1.79–2.59; P = 0.00001). At 1 year of follow-up, cardiac death was still significantly higher compared to non-cardiac death (OR 2.39, 95% CI 1.47–3.88; P = 0.0004), and this result did not change with a longer follow-up period (3–5 years) (OR 2.09, 95% CI 1.70–2.56; P = 0.00001). Death due to cardiac causes was still significantly higher in the subpopulations of patients with everolimus-eluting stents (OR 2.31, 95% CI 1.26–4.26; P = 0.007), paclitaxel-eluting stents (OR 2.36, 95% CI 1.63–3.39; P = 0.00001), sirolimus-eluting stents (OR 2.11, 95% CI 1.67–2.67; P = 0.00001), and zotarolimus-eluting stents (OR 2.12, 95% CI 1.11–4.05; P = 0.02), respectively.

Conclusions

Mortality due to cardiac causes was significantly higher than that due to non-cardiac causes in patients with ITDM who had undergone PCI. The same conclusion could be drawn from analyses focused on different follow-up periods, types of coronary stents, and type of study data used.

Enhanced digital features

To view enhanced digital features for this article go to https://doi.org/10.6084/m9.figshare.6247415.

Introduction

In this era of modern medicine, nearly three hundred and fifty million cases of diabetes have been diagnosed to date worldwide [1]. Mortality is a great concern among this patient population, especially in those with type 2 diabetes mellitus (T2DM) in co-existence with cardiovascular disease (CVD). Values calculated by the World Health Organization show that there are approximately three million deaths annually due to T2DM and its related complications [2]. Cardiovascular mortality, which was evaluated in the Second Cardiovascular Outcome Trial Summit of the Diabetes and Cardiovascular Disease (D&CVD) EASD Study Group [3], is also a major health risk factor in the population of patients with T2DM.

T2DM is an independent cause of mortality. Although data from the Korean National Health Insurance Service–National Sample Cohort showed that 78% of diabetes-related deaths could not be ascribed to diabetes [4], other studies have shown that in T2DM patients with CVD who were re-vascularized by percutaneous coronary intervention (PCI), insulin therapy significantly contributed to a high death rate [5].

We have therefore conducted a meta-analysis to compare cardiac- versus non-cardiac-related mortality following PCI in a sample of patients with insulin-treated type 2 diabetes mellitus (ITDM). To date, few studies have systematically assessed cardiac versus non-cardiac mortality in such patients following PCI.

Methods

Searched Databases and Key Words/Index Terms

We systematically and thoroughly searched the MEDLINE/PubMed, EMBASE, Cochrane library, and Google Scholar databases. the following key words/index terms were used to identify articles of possible interest:

T2DM + PCI, or
T2DM + coronary angioplasty, or
T2DM + PCI, or
ITDM + PCI, or
Cardiac death + ITDM + PCI.

Inclusion and Exclusion Criteria

Studies were included in the meta-analysis review if: (1) they were trials or cohort studies based on patients with T2DM following PCI; (2) they separately reported outcomes in patients with ITDM; (3) they reported cardiac death and non-cardiac death among their endpoints.

Studies were excluded from the systematic review if: (1) they did not involve patients with T2DM following PCI; (2) they did not separately report patients with ITDM; (3) they did not report cardiac death among their clinical outcomes; (4) they were repeated studies or duplicate studies.

Participants

All participants in the studies ultimately included in our systematic review were patients with ITDM. However, the extent of the coronary artery disease varied among studies and included ITDM patients with stable coronary artery disease, de novo coronary artery disease, acute myocardial infarction, single-vessel coronary artery disease, multi-vessel coronary artery disease (Table 1).

Table 1

Participants with insulin-treated type 2 diabetes mellitus and coronary artery disease participating in the studies included in the systematic review

First author/year/reference of studies included in the meta-analysis	Coronary artery disease status of study participants	Diabetes status of study participants
Antoniucci 2004 [9]	Acute myocardial infarction	ITDM
Bangalore 2016 [10]	Stable coronary artery disease	ITDM
Banning 2010 [11]	Left main and/or three-vessel coronary artery disease	ITDM
Dangas 2014 [12]	Multiple-vessel coronary artery disease	ITDM
Jain 2010 [13]	Single- or multi-vessel coronary artery disease	ITDM
Kappetein 2013 [14]	Complex coronary artery disease: de novo three-vessel and/or left main coronary artery disease	ITDM
Kirtane 2008 [15]	Single de novo lesion in a native coronary artery	ITDM
Kirtane 2009 [16]	Stable coronary artery disease	ITDM
Mehran 2004 [17]	Multi-vessel coronary artery disease	ITDM
Nakamura 2010 [18]	Coronary artery disease	ITDM
Simek 2013 [19]	All corner patients with coronary artery disease	ITDM
Tada 2011 [20]	Coronary artery disease	ITDM

ITDM insulin-treated type 2 diabetes mellitus

Definition of Endpoints

In this analysis, cardiac death was compared with non-cardiac death in diabetic patients who received insulin treatment. Therefore, the main focus was on: (1) cardiac mortality: death due to cardiac causes; (2) non-cardiac mortality: death which was not related to cardiac causes.

Data Extraction and Review

The following data were extracted by three reviewers independently of each other: (1) patients with ITDM; (2) the number of events corresponding to cardiac death; (3) the number of events corresponding to non-cardiac death; (4) baseline features; (5) methodological features of each study; (5) type of study.

The methodological qualities for the randomized controlled trials were assessed by using the guidelines set down in the Cochrane Handbook for Systematic Reviews of Interventions [6]. The Newcastle–Ottawa Scale (NOS) [7] was used to assess the methodological qualities for the observational studies.

Statistical Analysis

The computer program RevMan version 5.3 (The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen, Denmark) was used as analytical software. Odds ratios (ORs) with 95% confidence intervals (CIs) were calculated. Heterogeneity was assessed by two meta-analytical methods: (1) The Cochrane Q statistic test (a P value of ≤ 0.05 indicates a statistically significant result); (2) the I² statistic test (the lower the value, the lower the heterogeneity).

A fixed (I² < 50%) effects model or a random (I² > 50%) model was used based on the value of I² that was obtained.

Compliance with Ethics Guidelines

This meta-analysis is based on previously conducted studies and does not contain any studies with human participants or animals performed by any of the authors.

Results

Searched Outcomes

We followed the PRISMA guideline for this analysis [8].

A total of 1368 publications were identified from the database search using the chosen key words/index terms. Publications were excluded and eliminated based on the following criteria:

They were not related to the aim of this meta-analysis (n = 1282).
They did not report cardiovascular death, but instead reported total death among their clinical outcomes (n = 12).
They were meta-analyses or review articles themselves (n = 5).
They did not separately report patients with ITDM (n = 21).
They were duplicates of the same study (n = 36).

Ultimately, a total number of 12 articles (6 randomized controlled trials [RCTs] and 6 observational cohorts) [9‐20] were included in this meta-analysis, as shown in Fig. 1.

General and Baseline Features of the Participants

A total number of 4072 patients with ITDM who participated in 12 observational studies/RCTs were included in this meta-analysis. Of these, 1658 participants were extracted from RCTs and 2414 participants were extracted from observational studies. Two studies had a follow-up period of < 1 year, four studies had a follow-up period of 1 year, and six studies had a follow-up period of > 1 [range 3–5] year). One study reported patients who were treated with a bare metal stent, whereas all of the other studies involved patients who were treated with drug-eluting stents DES, specifically everolimus-eluting stents (EES), paclitaxel-eluting stents (PES), sirolimus-eluting stents (SES), and zotarolimus-eluting stents (ZES), as shown in Table 2.

Table 2

Total number of events and other features of the studies included in the meta-analysis

First author/year/reference of studies included in the meta-analysis	Type of study	Number of patients with cardiac death	Number of patients with non-cardiac death	Total number of patients	Duration of follow-up period	Type of stent
Antoniucci 2004 [9]	Observational	16	6	84	6 months	–
Bangalore 2016 [10]	RCT	18	8	747	1 year	PES, EES
Banning 2010 [11]	RCT	9	2	88	1 year	PES
Dangas 2014 [12]	RCT	42	20	325	5 years	DES (SES and PES)
Jain 2010 [13]	Observational	29	14	644	1 year	ZES
Kappetein 2013 [14]	RCT	16	5	89	5 years	PES
Kirtane 2008 [15]	RCT	15	13	265	4 years	PES, BMS
Kirtane 2009 [16]	RCT	0	0	144	1 year	ZES, PES
Mehran 2004 [17]	Observational	1	1	81	In-hospital	–
Nakamura 2010 [18]	Observational	13	10	200	3 years	SES
Simek 2013 [19]	Observational	63	25	489	3 years	EES, SES, PES
Tada 2011 [20]	Observational	149	80	996	3 years	SES

RCT randomized controlled trials, BMS bare metal stent, SES sirolimus eluting stents, DES drug eluting stents, ZES zotarolimus eluting stents, EES everolimus eluting stents, PES paclitaxel eluting stents

The baseline features of the participants with ITDM are given in Table 3. Based on the features which are listed, there was no significant difference between those patients who died due to a cardiac cause and those who died due to a non-cardiac cause.

Table 3

Baseline features of the participants

First author/year/reference of studies included in the meta-analysis	Age (years)		Males (%)		Hypertension (%)		Dyslipidemia (%)		Current smoker (%)		Body mass index (kg/m²)
	CD	NCD	CD	NCD	CD	NCD	CD	NCD	CD	NCD	CD	NCD
Antoniucci 2004 [9]	69.0	69.0	65.0	65.0	40.0	40.0	30.0	30.0	20.0	20.0	–	−
Bangalore 2016 [10]	58.5	58.5	71.0	71.0	65.6	65.6	76.2/	76.2	12.3	12.3	26.1	26.1
Banning 2010 [11]	65.4	65.4	71.0	71.0	69.9	69.9	81.5	81.5	15.8	15.8	29.5	29.5
Dangas 2014 [12]	62.6	62.6	61.3	61.3	87.5	87.5	–	−	17.9	17.9	30.5	30.5
Jain 2010 [13]	66.6	66.6	62.2	62.2	82.1	82.1	67.9	67.9	13.9	13.9	–	−
Kappetein 2013 [14]	65.4	65.4	71.0	71.0	70.0	70.0	82.0	82.0	16.0	16.0	29.5	29.5
Kirtane 2008 [15]	63.0	63.0	64.7	64.7	82.1	82.1	74.0	74.0	18.4	18.4	–	−
Kirtane 2009 [16]	63.3	63.3	71.0	71.0	76.7	76.7	81.4	81.4	64.8	64.8	–	−
Mehran 2004 [17]	63.0	63.0	52.0	52.0	77.0	77.0	71.0	71.0	11.0	11.0	–	−
Nakamura 2010 [18]	66.2	66.2	66.2	66.2	68.1	68.1	58.0	58.0	12.1	12.1	24.0	24.0
Simek 2013 [19]	65.1	65.1	69.2	69.2	70.6	70.6	65.5	65.5	32.1	32.1	28.8	28.8
Tada 2011 [20]	66.7	66.7	67.0	67.0	76.0	76.0	–	−	16.0	16.0	24.1	24.1

CD Cardiac death, NCD non-cardiac death

The methodological qualities of the studies were also assessed. RCTs were assessed with the recommended features of the Cochrane collaboration guidelines [6]. Grades were given to define the limit of bias (low, low to moderate, moderate, and high). For the observational studies, NOS scores [7] were given, with a maximum number of nine points (a higher score indicates better quality study), as shown in Table 4.

Table 4

Assessment of bias risk

First author/year/reference of studies included in the meta-analysis	Bias risk grade/score	Bias status
RCTs (Cochrane assessment)
Kirtane 2009 [16]	B	Low to moderate
Bangalore 2016 [10]	A	Low
Banning 2010 [11]	A	Low
Dangas 2014 [12]	A	Low
Kirtane 2008 [15]	B	Low to moderate
Kappetein 2013 [14]	B	Low to moderate
Observational studies (NOS assessment)
Antoniucci 2004 [9]	6	Moderate
Jain 2010 [13]	8	Low
Mehran 2004 [17]	6	Moderate
Nakamura 2010 [18]	6	Moderate
Simek 2013 [19]	7	Low
Tada 2011 [20]	6	Moderate

NOS Newcastle–Ottawa Scale

Death Due to Cardiac Versus Non-cardiac Causes Following PCI in Patients with ITDM

Analysis of the combined data extracted from the included RCTs and observational studies revealed that death due to cardiac causes was significantly higher in patients with ITDM than death due to non-cardiac causes(OR 2.16, 95% CI 1.79–2.59; P = 0.00001; I² = 0%) when (Fig. 2).

However, data from RCTs and observational studies were also analyzed separately. When we considered only data obtained from RCTs in the analysis, death from cardiac causes was still significantly higher in patients with ITDM (OR 2.20, 95% CI 1.54–3.14; P = 0.0001; I² = 14%) (Fig. 3). Similarly, when we considered only data obtained from observational cohorts, death due to cardiac causes was significantly higher in the ITDM patients (OR 2.14, 95% CI 1.73–2.66; P = 0.00001; I² = 0%) (Fig. 4).

When all the studies with a follow-up period of 1 year were analyzed together, cardiac death was still significantly higher in patients with ITDM compared to non-cardiac death (OR 2.39, 95% CI 1.47–3.88; P = 0.0004; I² = 0%) (Fig. 5).

When studies with longer follow-up periods were considered (range 3–5 years), mortality due to cardiac causes was still significantly higher in these patients with ITDM (OR 2.09, 95% CI 1.70–2.56; P = 0.00001; I² = 15%) (Fig. 6).

When the participants were analyzed based on the type of stents, death due to cardiac causes was still significantly higher in those patients having an EES (OR 2.31, 95% CI 1.26–4.26; P = 0.007, I² = 0%) compared to those a PES (OR 2.36, 95% CI 1.63–3.39; P = 0.00001; I² = 0%), SES (OR 2.11, 95% CI 1.67–2.67; P = 0.00001; I² = 21%), or ZES (OR 2.12, 95% CI 1.11–4.05; P = 0.02), as shown in Fig. 7.

Discussion

Cardiovascular death is a major concern among patients with T2DM who are treated by PCI. The results of our meta-analysis show that cardiovascular death in patients with ITDM who have undergone PCI was significantly higher that death due to non-cardiac causes. This result remained consistent even when data from the RCTs and observational studies were analyzed separately.

To assess the effect of differences in follow-up periods on the cause of death in this patient group, we also separately analyzed the data from all of the studies included in the meta-analysis which reported a follow-up period of 1 year. As reported in the "Results" section, cardiac death was still significantly higher in this subpopulation of patients with ITDM. When a longer follow-up period (3–5 years) was considered, the major cause of death remained cardiovascular.

We also assessed the impact of coronary stents on the results by analyzed the data from all studies based on the types of coronary stents which were implanted (EES, PES, SES, and ZES). However, cardiovascular cause of death was still significantly higher in the patients with ITDM.

An 11-year retrospective analysis of death certificates in Shanghai also showed an increasing occurrence of CVD among Chinese patients who had previously developed diabetes mellitus [21], with 29.9% of deaths among those diabetic patients due to cardiovascular causes; in comparison, other causes represented only small percentages. However, causes of death based specifically on patients with ITDM were not analyzed in that study.

Finally, even though research has shown diabetes mellitus to be independently associated with death due to CVD, other studies have shown that insulin therapy also makes a major contribution to such an outcome [5, 22]. In addition, female gender and higher co-morbidities have also been suggested to further contribute to such outcomes [23]. These factors should further be investigated in future studies.

There are a few limitations to our analysis. First, the total number of patients was relatively small, especially for the analysis on impact of types of coronary stents on cause of death in patients with ITDM treated by PCI. Second, data from different categories of participants (those with stable coronary artery disease, multi-vessel coronary artery disease, single-vessel coronary artery disease, left main coronary artery disease, and acute myocardial infarction) were combined and analyzed. Third, the anti-platelet agents which were used post-PCI were not taken into consideration and this might also have had an impact on the mortality rate.

Conclusions

In patients with ITDM, mortality due to cardiac causes was significantly higher than that due to non-cardiac causes following PCI. The same conclusion was reached when different lengths of follow-up periods were assessed, when different data sets were used (total data set, data from the observational cohort or RCTs separately), and when types of coronary stents which were implanted were assessed.

Acknowledgements

Funding

No funding or sponsorship was received for this study or publication of this article.

Authorship

All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take responsibility for the integrity of the work as a whole, and have given their approval for this version to be published.

Authorship Contributions

Qiang Wang, Hao Liu, and Jiawang Ding were responsible for the conception and design, acquisition of data, analysis and interpretation of data, drafting the initial manuscript, and critical revision of the manuscript for important intellectual content. Qiang Wang wrote the manuscript and is the first author.

Disclosures

The authors Qiang Wang, Hao Liu and Jiawang Ding have nothing to disclose. They do not have any personal, financial, commercial, or academic conflicts of interest.

Compliance with Ethics Guidelines

This meta-analysis is based on previously conducted studies and does not contain any studies with human participants or animals performed by any of the authors.

Data Availability

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

Open Access

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Titel: Cardiac Versus Non-Cardiac Related Mortality Following Percutaneous Coronary Intervention in Patients with Insulin-Treated Type 2 Diabetes Mellitus: A Meta-Analysis
verfasst von: Qiang Wang
Hao Liu
Jiawang Ding
Publikationsdatum: 19.05.2018
Verlag: Springer Healthcare
Erschienen in: Diabetes Therapy / Ausgabe 3/2018
Print ISSN: 1869-6953
Elektronische ISSN: 1869-6961
DOI: https://doi.org/10.1007/s13300-018-0444-y

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Cardiac Versus Non-Cardiac Related Mortality Following Percutaneous Coronary Intervention in Patients with Insulin-Treated Type 2 Diabetes Mellitus: A Meta-Analysis

Abstract

Introduction

Methods

Results

Conclusions

Enhanced digital features

Introduction

Methods

Searched Databases and Key Words/Index Terms

Inclusion and Exclusion Criteria

Participants

Definition of Endpoints

Data Extraction and Review

Statistical Analysis

Compliance with Ethics Guidelines

Results

Searched Outcomes

General and Baseline Features of the Participants

Death Due to Cardiac Versus Non-cardiac Causes Following PCI in Patients with ITDM

Discussion

Conclusions

Acknowledgements

Funding

Authorship

Authorship Contributions

Disclosures

Compliance with Ethics Guidelines

Data Availability

Open Access

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Update Innere Medizin

Live-Webinar: Aktuelle Leitlinien bei Herz-Kreislauf-Erkrankungen

Springer Medizin

Abstract

Introduction

Methods

Results

Conclusions

Enhanced digital features

Introduction

Methods

Searched Databases and Key Words/Index Terms

Inclusion and Exclusion Criteria

Participants

Definition of Endpoints

Data Extraction and Review

Statistical Analysis

Compliance with Ethics Guidelines

Results

Searched Outcomes

General and Baseline Features of the Participants

Death Due to Cardiac Versus Non-cardiac Causes Following PCI in Patients with ITDM

Discussion

Conclusions

Acknowledgements

Funding

Authorship

Authorship Contributions

Disclosures

Compliance with Ethics Guidelines

Data Availability

Open Access

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