International Journal of Clinical and Experimental Medical Sciences
Volume 2, Issue 5, September 2016, Pages: 67-77

 Review Article

Cardiovascular Manifestations of Diabetes Mellitus: A Narrative Review of Literatures

Seyed Mohammad Yousof Mostafavi-Pour-Manshadi1, *, Nafiseh Naderi1, Abolfazl Dehghan2, Sanaz Azizi2

1Department of Medicine, Division of Experimental Medicine, Research Institute of McGill University Health Center, McGill University, Montreal, Quebec, Canada

2Department of Medicine, Ali Ben Abitalib Medical College, Islamic Azad University, Yazd, Iran

Email address:

(S. M. Y. Mostafavi-Pour-Manshadi)

*Corresponding author

To cite this article:

Seyed Mohammad Yousof Mostafavi-Pour-Manshadi, Nafiseh Naderi, Abolfazl Dehghan, Sanaz Azizi. Cardiovascular Manifestations of Diabetes Mellitus: A Narrative Review of Literatures. International Journal of Clinical and Experimental Medical Sciences. Vol. 2, No. 5, 2016, pp. 67-77. doi: 10.11648/j.ijcems.20160205.11

Received: May 10, 2016; Accepted: June 3, 2016; Published: August 4, 2016


Abstract: There are many studies documenting that diabetes mellitus is associated with cardiovascular diseases. Diabetes mellitus has a significant role and is an important risk factor in cardiovascular manifestations in patients with diabetes mellitus. Cardiovascular diseases are one of the main causes of morbidity and mortality in diabetic patients. Diabetes mellitus can affect performance, construction, and the anatomy of the heart and vessels. As a result, it can lead to cardiovascular complications, such as left ventricular systolic and diastolic dysfunction, left ventricular hypertrophy, coronary heart disease, peripheral artery disease, myocardial infarction, congestive heart failure, and cardiomyopathy. Different mechanisms of diabetes mellitus play an important role in the manifestations of cardiovascular diseases in diabetic patients. Understanding of these mechanisms can help physicians recognize, prevent, and treat the associated cardiovascular complications of diabetes mellitus. A detailed investigation of cardiovascular complications and diseases might be significant in the prognosis of diabetic patients and can be useful in managing and treating such patients.

Keywords: Cardiovascular Manifestations, Diabetes Mellitus, Heart Failure, Cardiomyopathy, Cardiovascular Diseases, Cardiovascular Complications


1. Introduction

Diabetes Mellitus (DM) has a worldwide prevalence which has recently gone from 1% to 13% because of the obesity and inactive or machinery life.1-3 There are over 200 million patients with diabetes mellitus (about 8%) in the world and 80% of them have diabetes type 2.4-5 The World Health Organization (WHO) foresees this amount of the diabetic population to rise to almost 366 million or more by the year 2030.6 The primary causes of diabetes mellitus type 2 include the incorporation of insulin-mediated glucose disposal dysfunction (insulin resistant) and insufficient insulin secretion because of defected pancreatic beta cells.3 Cardiovascular complications among the diabetic patients show a remarkable association with diabetes mellitus. These complications and diseases are the main and notable causes of morbidity and mortality in the patients with diabetes (about 65-75%) and consequently, the financial burden and clinical involvements are considerably high.1,3,6,7 Diabetes mellitus increases the risk of cardiovascular diseases independently, especially coronary artery disease, in both male and female diabetic patients by 2-4 times3,8,9 and the associated morbidity by 2-6 folds.10

In an earlier study, the prevalence of coronary heart disease in the patients with diabetes mellitus was significantly higher (75%).7 Increasing levels of blood glucose are one of the risk factors for cardiovascular diseases (16%) among healthy individuals without diabetes.11 Several studies have shown that other risk factors such as duration of diabetes, female sex, accompanying risk factors and subclinical atherosclerosis appearance are considerably related to the cardiovascular risk presented to diabetic patients.6,12

The degree of blood glucose elevation is an anticipated factor for cardiovascular risk in diabetic or non-diabetic patients.6,12 According to a statement from the American Heart Association (AHA) "diabetes is a cardiovascular disease."3 It is important to know more about cardiovascular diseases and complications of diabetes mellitus and prevent or diagnose them as soon as possible before an irrecoverable occurrence.

2. Cardiomyopathy, Heart Failure, Diastolic Abnormalities and Left Ventricular Hypertrophy and Dysfunction

2.1. Possibility of Cardiomyopathy

A condition is considered as diabetic cardiomyopathy when an intensified ventricular/myocardial dysfunction is diagnosed in diabetic patients without any coronary disease, hypertension, atherosclerosis or valvular disease. This is a clinical situation that might lead to an accelerated heart failure.13-17 Diastolic dysfunction is an apparent feature of diabetic cardiomyopathy.18,19 Diabetic cardiomyopathy has several possible basic causative factors such as severe coronary atherosclerosis, chronic hyperglycemia, prolonged hypertension, microvascular disease, glycosylation of myocardial proteins and autonomic neuropathy.3 Most the research in this field demonstrates that diabetic cardiomyopathy causes diastolic dysfunction in people without chronic heart failure (CHF) than nonischemic systolic heart failure.20

However, if diabetes results in diastolic dysfunction, it may suspiciously be idiopathic cardiomyopathy (ICM), which is determined by dilated left and/or right ventricle.21

In diabetic people, the risk of ICM may increase due to metabolic abnormalities and vascular diseases. Microvascular diseases caused by chronic hyperglycemia lead to decreased coronary flow reserve.22

In this disease, cardiac function and structure undergo through changes; however, the causes are still unknown.13 The association of diabetes mellitus and cardiomyopathy is higher in diabetic patients with microvascular complications.13 Decrease in diastolic function without any effect on systolic function is the preliminary cardiac manifestation of diabetic cardiomyopathy.23

2.2. Heart Failure

Heart failure is defined as the existence of any of the structural or functional cardiac abnormalities leading to ventricular dysfunction, and as a result, impairment of filling with or ejecting blood.24

Diabetes mellitus is considered as a cause of both systolic25 (left ventricular ejection fraction <45%) and diastolic heart failure (inability of the heart to relax and fill with blood).25,26

There is an association between diabetes and heart failure. Diabetes is commonly associated with heart failure in patients with preserved ejection fraction. Diastolic dysfunction is also frequently observed in patients with diabetes but without heart failure. The risk of heart failure increases with the presence of diabetes mellitus.27 The risk of heart failure in patients with diabetes mellitus increases with the advancing age, blood pressure, cholesterol level and as well history of coronary artery disease.13

Actually, diabetes can accelerate the occurrence of heart failure and increase its progression.2 According to American College of Cardiology/American Heart Association, it is an independent factor of heart failure.24 There are several reports concluding that diabetes mellitus is a major risk factor for cardiovascular diseases, especially heart failure.28-30 According to a study, diabetes mellitus is associated with the ICM significantly and independently in the general U.S. population30 (RO 1.58, 95% CI 1.55-1.6230). It has been revealed that when HbA1C elevates 1%, the risk of heart failure increases 8%-16%, which shows an association between level of HbA1C and heart failure.27,29 In a recent study, 12% of patients with diabetes type 2 had heart failure at the time of admission; and an annual rate of heart failure was 3.3%.31 Schidler et al. showed that hospitalization because of heart failure was 1.6 times higher in diabetic patients than non-diabetics.28 In addition, all-cause mortality, cardiovascular mortality, and morbidity related to pump failure were higher in patients with diabetes mellitus.28 According to another study, among the patients admitted with heart failure those having diabetes had a greater mortality rate in both genders.32 Echocardiography findings showed that patients with diabetes mellitus have a prolonged pre-ejection period and a shortened ejection time.33 Both of these conditions can affect resting left ventricular ejection fraction and systolic function and decrease both of them.2,33 Furthermore, atrial filling velocity showed a considerable increase in diabetes while early filling velocity showed a decrease in these patients.33 Diastolic dysfunction has been found in 27-69% diabetics without any symptoms, but none with left ventricular diastolic dysfunction.34 In another instance, the prevalence of asymptomatic diastolic dysfunction in type 2 diabetic patients was between 52% and 60%.35 According to one study, accumulation of Cu in tissues of diabetic patients can probably destroy the heart and lead to heart failure and left ventricular damage/dysfunction. In addition, treatment with trientine can increase urinary Cu and reverse heart failure and left ventricular damage in diabetic patients.36 Diabetic men and women have higher rates of heart failure, which is about 2- and 5-fold higher, respectively than non-diabetics.1 Diabetes mellitus is an independent risk factor for heart failure and cardiac dysfunction.5

2.3. Abnormalities of Cardiac Function

Diabetes mellitus has a remarkable relationship with diastolic dysfunction in the non-existence of defected systolic function that can lead to congestive heart failure.13,37 In other words, diabetes mellitus increases the risk of heart failure to almost 60%.38 Recent progress in imaging techniques such as tissue Doppler imaging and color M-mode makes the detection of diastolic dysfunction easier.1 In a study, 46% of changed left ventricular filling were detected by conventional Doppler in patients with asymptomatic normotensive type 2 diabetes mellitus while in another study; diastolic dysfunction was diagnosed by newer (recent) techniques in 75% of patients.14 Older people with a mean age of 81 years old and diabetes mellitus have higher rates of congestive heart failure (about 1.3 times) compared to the individuals in the same age group.39 Diabetic patients, especially with left ventricular dysfunction and undergoing revascularization showed significantly decreased long-term survival and remarkably reduced survival without heart failure.40 After percutaneous transluminal coronary angioplasty or coronary artery bypass grafting, heart failure with late-onset was recurrent in patients with diabetes mellitus.40 It has recently been noticed that new-onset of atrial fibrillation in patients with new-onset of diabetes mellitus has a considerably greater rate, approximately 49%, in comparison to the patients without diabetes mellitus.41 In another study, it was observed that 75% of patients with unexplained idiopathic dilated cardiomyopathy had diabetes mellitus compared to a control group of same age.42

Oliveira et al. showed that gestational diabetes could lead to diastolic left ventricular dysfunction.43 Left ventricular function abnormalities have been detected in diabetic patients without any considerable coronary artery diseases or systolic abnormalities. Furthermore, in a study, diastolic dysfunction was diagnosed in young patients with diabetes type 1 without any cardiovascular diseases, which might be the first onset of diabetic cardiomyopathy.34

Diastolic abnormalities are the most common ones, which are demonstrated earlier than systolic abnormalities in patients with diabetes mellitus.13

Hemoglobin A1C and range of fasting blood glucose are associated with heart failure. A higher level of hemoglobin A1C or fasting blood glucose significantly increases the risk of heart failure. However, one study reported that patients with diabetes mellitus and heart failure have similar rates of short-term mortality compared to non-diabetics with heart failure,44 diabetic patients with heart failure have a greater incidence of re-hospitalization.40,44 Cardiomyocyte hypertrophy and high cardiomyocyte resting tension were reported as principal causes of diastolic left ventricular stiffness in diabetic patients who had diastolic heart failure.45

One of the main causes of mortality and morbidity is congestive heart failure (CHF). The major causes of CHF are coronary artery disease and hypertension. Other risk factors are the occurrence of left ventricular hypertrophy (LVH), valvular heart disease, diabetes, smoking, obesity, and dyslipidemia.46,47 Diabetes mellitus as an anticipated factor of CHF was explained in some studies.44,47 Diabetes is considered as a risk factor for CHF but its relationship with CHF has not been completely understood.47,48 Alterations of left ventricular function and structure that are associated with diabetes mellitus or diminished glucose regulation have been described in recent studies.42,49 It has been reported that insulin resistance worsens prognosis of CHF patients and it is related to the disease severity;50 although it is not considered as a predictor risk factor for CHF.48 One study found insulin resistance as predictor for CHF independent of diabetes mellitus and other related risk factors for CHF.46 A clinical study detected that asymptomatic diabetic patients have frequent and superior subclinical left ventricular abnormalities in spite of diastolic dysfunction. In addition, this study reported that reduction in longitudinal strain (LS) is associated with duration of diabetes mellitus in multivariate linear regression analysis (t=2.22, P=0.0313) and in univariate analysis (P=0.0006).51 Furthermore, it showed that two-dimensional speckle tracking echocardiography (2DSTE) is an efficient tool for detecting of subclinical left ventricular dysfunction and helps us to get more information about risk stratification in asymptomatic diabetic patients.51 A decrease in the radial (RS) and circumferential strain (CS) is remarkable in patients with diabetes mellitus.51 Diastolic dysfunction as an early manifestation of diabetic heart has been reported in patients with diabetes mellitus with normal left ventricular ejection fraction (LVEF).52 Longitudinal appearance is the primary manifestation in diabetics with left ventricular systolic dysfunction.53 Patients with diabetes type 2 show a decrease in systolic and diastolic velocity during exercise.54

Left ventricular hypertrophy and dysfunction are the most common cardiac malformations in asymptomatic diabetics, especially in diabetic women.55

A study reported remarkably higher heart rate in diabetic patients than patients without diabetes.56 Myocardial catecholamine supplies are reduced in diabetic patients that lead to systolic and diastolic dysfunction.57

3. Coronary Artery Disease, Atherosclerosis, Atherogenic Dyslipidemia and Atherogenesis

One of the main complications of diabetes mellitus is coronary artery disease.58 There are irregularities in the supply of a coronary artery stream without any epicardial coronary artery diseases.59-61 Patients with diabetes mellitus are more prone to get coronary artery diseases, especially the multi-vessel form.2,62 In addition, prevalence of silent myocardial ischemia is more in diabetics than non-diabetic patients.2 Bartnik et al. showed 36% of patients with acute coronary artery disease (CAD) had impaired glucose regulation.63 Impaired glucose regulation was detected in 22% patients with CAD by oral glucose tolerance test (OGTT) who had not previous diabetes or history of it.63 In the group with the stable manifestation of CAD, these proportions were 37% and 14%, respectively.63 This study revealed that OGTT should be used as a routine test for diagnosing of glucometabolic state.63 Atherosclerosis can be accelerated by diabetes, which can increase mortality and morbidity rate of coronary artery disease. This is supported by the fact that a high proportion of lipid-rich, inflamed atheroma with macrophage infiltration, and subsequent thrombosis are revealed more in coronary arteries of diabetics than non-diabetics. In addition, a rupture of thrombosis plaque is more probable in patients with diabetes than patients without it.2,64 Mortality and morbidity rates after coronary revascularization or after coronary artery bypass graft are significantly higher in diabetic patients than non-diabetics patients.2,65 In a one-year follow-up study, survival free of any unfavorable event and myocardial infarction was considerably lower in diabetics than in non-diabetics, while the frequency of both restenosis and stent vessel occlusion were remarkably higher in patients with diabetes in comparison to the patients without diabetes.6 The prevalence of death, recurrent myocardial infarction, and returned revascularization are considerably greater in the presence of diabetes mellitus.66 Diabetic patients have a higher rate of death and non-lethal outcomes after coronary artery bypass graft.2 A study reported that the patients in whom diabetes was treated had a long-term of survival advantage (about 10 years).67 Elevated level of blood glucose even below the defined level for diabetes mellitus is an apparent risk factor for coronary artery diseases.68,69 Euro Heart Survey research on diabetes and heart showed that there is an abnormal glucose metabolism in most of the patients with coronary artery disease.70,71

Coronary artery atherosclerosis leads to myocardial ischemia without any symptoms in diabetic patients.3 Consequently, atherosclerosis of vessels appears before ischemic symptoms and before administration of treatment. An early diagnosis of diabetic cardiovascular diseases and complications can prevent serious side effects and improve the prognosis of survival in diabetic patients.3 There is a complication in most diabetic patients that is called atherogenic or diabetic dyslipidemia, which is indicated by lipid triad abnormalities (elevated very-low-density lipoproteins (VLDL), small low-density lipoproteins (LDL) particles, and low high-density lipoprotein (HDL) cholesterol). This complication with increased level of apolipoprotein B, which is elevated in patients with atherogenic dyslipidemia, develops atherosclerosis in these patients.72 Diabetes can be a cause of reduced HDL-cholesterol levels and its dysfunction leading to atherosclerosis.73 Vascular inflammation and derangements in the cellular component of vasculature can increase in the presence of diabetes mellitus as well as with changes in hemostatic factors and blood cells. All of these effects lead to accelerating the risk of atherogenesis.74 Overall, diabetes can increase the risk of atherosclerosis by the demolition of the vessel wall as well as affecting blood cells and rheology.74 There are several factors such as increased oxidative stress, hyperglycemia, endothelial dysfunction, increased inflammatory markers and genetic variables, which may play some roles in diabetic patients in accelerating atherosclerosis.75 Endothelial swelling and/or degeneration and thickening of the capillary basement membrane are two remarkable abnormalities of the myocardial capillary in patients with diabetes mellitus.76

Silent myocardial ischemia as a result of coronary artery atherosclerosis has higher rates of incidence in diabetic patients in comparison to non-diabetics (39% versus 22%).77,78

4. Stroke

Mortality from stroke is higher (three times) in diabetic patients compared with non-diabetic patients.3,79 The most conventional site that is involved in stroke in patients with diabetes is small paramedical penetrating arteries.3,79 Diabetic patients are more likely to have severe carotid atherosclerosis.3,80 Serious brain damage due to carotid emboli is more often diagnosed in diabetic patients than patients without diabetes. Diabetics with more than 65 years of age have a history of having stroke almost 13%.3,81 Each 1% elevation in HbA1C level increases 12% the risk of stroke.27

Stroke is responsible for 16% of death in diabetic patients.82 In Addition, atrial filling velocity related with stroke volume shows a significant increase in patients with diabetes mellitus.33

5. Hypertension

Hypertension is a major risk factor for cardiovascular diseases and stroke, and a two-fold increase in their risk has been observed in the presence of hypertension.3,83 It also leads to diabetic nephropathy.3,83

Hypertension in diabetic patients is associated with several factors such as obesity, insulin resistance, hyperinsulinemia, renal disease/nephropathy,75 extracellular fluid volume expansion, and increased arterial stiffness.75,84

6. Myocardial Infarction

Prevalence of myocardial infarction is higher in all age groups of diabetic patients, which is really noticeable.2 In addition, it is more intensive and serious in diabetic patients and involves large-scale of heart of these patients.77,85 Each 1% increase of the HbA1C level leads to 16% increase in congestive heart failure risk.27 According to investigations, the probability of sudden cardiac death, undiagnosed myocardial infarction, and silent myocardial ischemia are higher in diabetic patients than patients without diabetes mellitus.86 For example, DeLuca et al. reported that 18% of patients with diabetes mellitus have a myocardial infarction in comparison to 7% of patients without diabetes mellitus.86 Moreover, 33% of patients with diabetes mellitus and without a history of angina pectoris had silent myocardial ischemia in comparison to 15% of patients without diabetes mellitus and history of angina pectoris.86 In another study showed that the seven-year incidence rates of myocardial infarction in diabetics with and without prior myocardial infarction were 45% and 20.2%, respectively, while in non-diabetics were 18.8% and 3.5%, respectively.87 In addition, another important observation in this study was that the risk of myocardial infarction in patients with diabetes was as high as in those without diabetes, who had a history of prior myocardial infarction.87 Diabetics experience lower rates of long-term survival compared with non-diabetics.88 The occurrence of new coronary artery disease was greater in diabetic patients than non-diabetic patients who had previous myocardial infarction.89 A study based on the FINMONICA myocardial infarction registry, a part of the Finnish contribution to the WHO MONICA Project (World Health Organization Multinational Monitoring of Trends and Determinants of Cardiovascular Disease) was performed between 1988 and 1992; wherein one-year mortality rate of diabetics was higher than non-diabetics  (81.1% versus 52.8%).90 Furthermore, the out-hospital mortality rate was greater in patients with diabetes in comparison to patients without diabetes (38.7% versus 33.4%).90 The prevalence of acute ischemic syndromes, advanced cardiovascular complications, and peripheral artery diseases is higher in diabetic patients than non-diabetic ones.2,3 Since typical clinical symptoms of myocardial infarction may not be manifested in patients with diabetes mellitus, it may be diagnosed late or not at all. Efficient methods and strategies are necessary to investigate myocardial infarction in patients with diabetes; this can prevent crucial complications and reduce mortality and morbidity rate in these patients. Moreover, use of effective techniques for diagnosing early onset of cardiovascular or atherosclerosis manifestations will help the primary care and prevent contributing life-threatening side effects in diabetic patients.3 Myocardial infarction mortality rate in male diabetic patients was four times higher, while it was seven-times higher in female ones in comparison to a population without diabetes mellitus.91 Furthermore, another recent investigation reported that the rate of myocardial infarction and chronic heart disease in male diabetic patients was same as in the females with diabetes mellitus, while the rate of coronary bypass grafting and transluminal coronary angioplasty was doubled in male diabetic patients.92

7. Endothelial Dysfunction

Patients with diabetes mellitus who have normal coronary arteries and no other risk factors for coronary artery disease, have endothelial dysfunction that is related to insulin resistance alone.2,93 Diabetic patients have endothelial dysfunction and vascular irregularity, which cause defects in the arterial system, and as a result, lead to atherosclerosis and associated complications.2,74,93 Diabetes mellitus can lead to vascular muscle cell dysfunction that is associated with accelerated atherosclerosis.94

8. Cardiac Autonomic Neuropathy

Diabetic patients have a common form of autonomic abnormality, known as cardiovascular autonomic neuropathy (CAN); it leads to heart rate irregularity and imperfection in peripheral and central vascular dynamic.95 Cardiac autonomic neuropathy is manifested by reducing heart rate and change in sympathetic/parasympathetic balance that causes a decrease in parasympathetic and increases sympathetic activity. Sympathetic and parasympathetic dysfunction together can cause slower heart rates.95 We cannot rely solely on reduced heart rates to diagnose CAN because, with advanced nerve dysfunction, heart rates can be normal95 but it persists in higher rates than patients without any diseases.96 As a result, heart rate cannot be a reliable factor in determining CAN; however, decreased heart rate is the primary manifestation of CAN.95 CAN is considered as a common chronic complication of diabetes mellitus that threatens the life of patients with diabetes.97 Its worldwide prevalence varies from 1.6% to 90%.98 Dysfunction of autonomic nerve fibers that regulate heart rate, cardiac output, myocardial contractility, cardiac electrophysiology, blood vessel constriction and dilatation can be defined as CAN.97,99 Many cardiac disorders are associated with CAN such as resting tachycardia, intraoperative cardiovascular instability, arrhythmias, asymptomatic myocardial infarction, ischemia, and increased rate of mortality after myocardial infarction.97,99 CAN is diagnosed by several clinical symptoms, such as postural hypotension, dizziness, lightheadedness, presyncope, syncope and early fatigue and exhaustion during exercise; all of these are demonstrated in later stages.98 The first finding of CAN is, decreased heart rate variability (HRV), which is a subclinical finding and can be diagnosed through deep respiration.100 It can occur even in normal heart rate conditions.100 Increased resting heart rate, from 90 to 100 beats/minute or even more than 130 beats/minute, is one of the common findings of CAN, which is due to vagal dysfunction.96 Patients who have lone parasympathetic dysfunction experience highest rates of resting heart beats.96 In diabetic patients with CAN, sympathetic is predominant in the night and changes the profile of nocturnal blood pressure101 that leads to left ventricular hypertrophy and life-threatening and non-lethal cardiovascular happenings.102 Non-responsive heart rate towards moderate exercise, stress or sleep reveals that the heart has missed its nervous system103 (denervation) and the patient is in severe stage of CAN.104

CAN is one of the cardiac manifestations of diabetes mellitus that may be associated with left ventricular dysfunction.105

CAN includes several clinical demonstrations such as intraoperative cardiovascular lability, exercise intolerance, orthostatic hypotension, asymptomatic ischemia, painless myocardial infarction, and increased risk of mortality.106 CAN decreases ejection fraction and diastolic filling and also disrupts systolic function as its potential effects on the heart.107 Diabetic patients with CAN intraoperatively (during anesthesia induction) have abnormal hemodynamics and higher levels of reduced heart rate and blood pressure in comparison to non-diabetic patients,108 and also after intubation and extubation.103,108 A study done on patients with diabetes type 2 showed that one of the most powerful anticipators of myocardial ischemia in these patients is cardiac autonomic dysfunction.109 Impairment of circadian rhythm of blood pressure is one of the effects of CAN on blood pressure; it can lead to more than 10% reduction in nocturnal blood pressure.101 CAN is a cause of high rates of fetal arrhythmias and sudden death, which are more prevalent in patients with diabetes mellitus,104 and may be made susceptible by QT prolongation.110 The rates of 5-year mortality in both types of diabetic patients with CAN were reported between 16% and 50%, the most common cause of their mortality was sudden cardiac death.111 CAN in diabetic patients rebounds to a reduction in coronary artery flow and abnormality of diastolic function, which can lead to systolic dysfunction.99 CAN leads to stroke and is associated with it.112 Overall, CAN is a frequent complication of diabetes mellitus that is associated with other severe or life-threatening complications such as orthostatic hypotension, intraoperative and preoperative cardiovascular abnormalities, abnormal blood pressure profile, arrhythmias, diabetic cardiomyopathy, silent myocardial ischemia, and stroke.113

9. Peripheral Arterial Disease

Peripheral artery disease (PAD) is a manifestation of atherosclerosis that is determined by an atherosclerotic obstruction in lower extremities and also defined as the main risk factor for their amputation. In addition, it would likely appear in the presence of cardiovascular and cerebrovascular disease. In other words, it is a common cardiovascular manifestation in diabetics.74 In the Framingham Heart Study, PAD was detected in 20% of the patients with diabetes mellitus,114 which was manifested with an ischemic ulcer or gangrene in these patients.74,115 The most common manifestation of PAD is intermittent claudication.74 Risk factors that are associated with increasing PAD are age, diabetes duration and occurrence of peripheral neuropathy.74 Some studies showed a greater prevalence of PAD in diabetic patients (20-29%) than that determined earlier.74,115 Cardiovascular disease shows a higher incidence in diabetic patients with PAD compared with non-diabetic patients with PAD.74 It is really important to diagnose PAD because of its higher risk for cardiovascular disease and to prevent its irreparable complications such as functional disability or limb amputation.74 PAD and diabetes together have worse effects on lower extremities function than PAD alone.116 Furthermore, these patients experience sudden ischemia of arterial thrombosis and neuro-ischemic ulceration and infection leading to a higher risk of amputation than non-diabetic patients with PAD.74 Vascular dysfunction that leads to atherosclerosis may be determined before the diagnosis of diabetes mellitus in patients.74 According to recent multivariate analysis, vasculopathy events were higher remarkably in prediabetes patients than the control group (P>0.0001).117 In addition, a remarkable higher level of blood viscosity (P<0.04) and homocysteine (P<0.03) were detected in prediabetes than a control group.117 Furthermore, it was reported higher levels of plasma D-dimer in prediabetes than controls, which had no significant statistical difference.117

10. Hyper Coagulopathy

Patients with diabetes mellitus/insulin resistance demonstrate different prothrombotic/coagulopathy states such as increased fibrinogen levels, increased plasminogen activator inhibitor-1, and various platelet abnormalities that make them vulnerable to arterial thrombosis.3,118

Intracellular signaling systems that regulate the function of platelets are altered in type 2 diabetic patients (T2DM).119 Diabetes mellitus boosts platelet activation and aggregation, by increasing platelet surface expression of glycoprotein Ib and IIb/IIIa; this leads to endothelial dysfunction and increases coagulation activity.120,212 In addition, diabetic patients experience increased levels of other thrombotic factors including factor VII, thrombin, and tissue factor. On the other hand, they have reduced levels of endogenous anticoagulants thrombomodulin and protein C.75, Platelet dysfunction not only affects atherosclerosis but also impacts plaque disruption and atherothrombosis.112 Blood coagulability is really vital in patients with ischemic heart diseases. Rupture of atherosclerotic plaque and obstruction of a major/main artery by a blood clot (thrombus), are most common causes of myocardial infarction and stroke occurrences in ischemic heart patients.123 Most of the mortalities in diabetic patients are due to thrombotic events, 75% of these events are myocardial infarction, and the rest of them are cerebrovascular occurrences and peripheral vascular disease complications.124,125 Platelet activation can form a thrombus in myocardial microcirculation and progress the heart failure.125

Figure 1. Cardiovascular Manifestations of Diabetes Mellitus.

11. Conclusion

In conclusion, diabetes mellitus is considered as one of the principal causes of cardiovascular manifestations in patients who suffer from diabetes. In other words, cardiovascular demonstrations can occur frequently in diabetic patients and lead to irreparable and/or life-threatening complications. It is concluded that cardiovascular diseases are at the highest rank regarding morbidity and mortality of patients with diabetes mellitus. As a result, early diagnosis of cardiomyopathy or diabetic heart plays a significant role in preventing or delaying of the heart failure and its complications with balancing lifestyle and administration of useful drugs and medical interventions. Furthermore, steady and better control of blood glucose, meliorated control of hypertension and preventing atherosclerosis events may prevent or alleviate diabetic heart/cardiomyopathy and its complications. We need to put continuous efforts in studying and doing research to learn more about the complicated pathophysiology of diabetic cardiomyopathy/diabetic heart and enhance our knowledge about it to prevent, diagnose and treat it as early as possible.

Conflict of Interest

None Declared.


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