EHJ Part II
EHJ Part II
EHJ Part II
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European Heart Journal Advance Access published April 26, 2013
Clinical update
In part II of this review, we describe the epidemiology and clinical consequences of vascular disease in patients with diabetes, and discuss the ef-
ficacy of risk factor modification and antiplatelet treatment. Specifically, evidence-based cardiovascular therapies are discussed through novel
clinical insights on management of hyperglycaemia, hypertension, dyslipidaemia as well as platelet dysfunction. Recent trends in the incidence
and outcomes of vascular disease in diabetes suggest that timely and effective implementation of therapies is making a favourable impact.
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Keywords Diabetes Vascular disease Medical therapy
but continue to increase in Asia and Africa, making clear the global
Introduction nature of the problem.13 16
Diabetes and vascular disease are intimately linked and share patho- Recently, investigators have identified subsets of patients with dia-
physiological features as examined in Part I of this review. In this betes at the highest risk. In a meta-analysis of 29 clinical trials that
section, we review the epidemiology and clinical consequences of included at least 1000 patients with diabetes, two factors were
vascular disease in patients with diabetes, and discuss the efficacy noted to identify a higher risk cohort within the diabetes population:
of risk factor modification and antiplatelet treatment. Since the the presence of cardiovascular disease and the presence of protein-
reviews published on this topic by the authors previously,1,2 contem- uria.17 Cardiovascular disease increased the rate of all-cause death
porary trends in the incidence and outcomes of vascular disease in nearly three-fold and the rate of cardiovascular death nearly five-fold
diabetes suggest that timely and effective implementation of therap- in subjects with diabetes. These results are in concordance with
ies is making a favourable impact. another systematic review of large trials in patients with diabetes,
demonstrating the association of renal disease, measured either by
Epidemiology of diabetes and the function or presence of proteinuria with increased mortality.18
* Corresponding author. Tel: +1 617 525 7053, Fax: +1 617 232 2749, Email: jbeckman@partners.org
Published on behalf of the European Society of Cardiology. All rights reserved. & The Author 2013. For permissions please email: journals.permissions@oup.com
Page 2 of 13 J.A. Beckman et al.
than in patients without it. In the Metabolic Efficiency With Ranola- Stroke
zine for Less Ischemia in Non-ST-Elevation Acute Coronary Diabetes also contributes significantly and increasingly to the burden
Syndromes6-TIMI 36 trial of 6560 patients with non-ST-segment ele- of stroke.44,45 In the INTERSTROKE case control study, performed
vation myocardial infarction, subjects with diabetes had higher rates in 22 nations, diabetes increased the rate of stroke by 35% when com-
of the composite endpoint of cardiovascular death, myocardial in- paring the top to the bottom tertile, and was associated with 5% of
farction, or recurrent ischaemia.27 In the Trial to Assess Improve- the population attributable risk for stroke.46 The Emerging Risk
ment in Therapeutic Outcomes by Optimizing Platelet Inhibition Factors Collaboration analysed 698 782 people from 102 prospect-
With Prasugrel-Thrombolysis in Myocardial Infarction 38 (TRITON- ive studies, finding that diabetes was associated with a 2.27-fold in-
TIMI 38),28 of 13 608 subjects with acute coronary syndromes, prasu- crease in the risk of ischaemic stroke and 56% excess rate of
grel lowered adverse event rates, but patients with diabetes still had haemorrhagic stroke.47 Following a stroke, diabetes attenuates cog-
higher levels of myocardial infarction, cardiovascular death, and stent nitive recovery,48 limits functional outcome,49 and increases mortal-
thrombosis than patients without diabetes. In a Danish study of 3655 ity.50 Diabetes increases the risk of recurrent stroke as well. In the Life
consecutive patients with ST-segment elevation myocardial infarc- Long After Cerebral ischemia (LiLAC) cohort study, diabetes
tion treated with percutaneous coronary intervention, diabetes increased the risk of recurrent fatal and non-fatal stroke more than
was associated with a more than two-fold increase in the rate of myo- two-fold.51
cardial infarction and all-cause mortality over 3 years of follow-up.29 Identification and implementation of effective therapies have
compared with placebo, but showed benefit in its composite second- fatty acid oxidation inhibitor, it improves glucose utilization and has
ary endpoint (all-cause mortality, non-fatal MI, and stroke),74 while consistently performed as a hypoglycaemic agent.82,83 Despite the
rosiglitazone has been associated with an increase in myocardial in- glucose-lowering capability, patients with diabetes do not gain
farction but not all-cause mortality.80 extra function or improved cardiovascular outcomes with ranola-
Several other hypoglycaemic medications are commonly zine. Current guidelines do not support the use of these agents to
employed for diabetes, but lack enough data to recommend their improve cardiovascular outcomes in patients with diabetes.79 More-
use as treatments to reduce cardiovascular events. Acarbose, an over, the safety requirements for the approval of hypoglycaemic
alpha glucosidase inhibitor, reduced the rate of myocardial infarction agents for type 2 diabetes has undergone scrutiny and now faces a
by 91% and a composite of cardiovascular events (myocardial infarc- higher threshold at the Food and Drug Administration in the
tion, new angina, revascularization, cardiovascular death, congestive United States.84
heart failure, cerebrovascular events, and peripheral vascular
disease) by 49% in subjects with impaired glucose tolerance in the Hypertension
STOP-Noninsulin Dependent Diabetes (NIDDM) trial.81 However, Treatment of hypertension was the first among the therapies of the
cardiovascular risk reduction with acarbose has not been reported comorbidities of patients with diabetes to reduce mortality. In
in patients with diabetes. Neither incretin mimetics, dipeptidyl pep- UKPDS, 1148 hypertensive patients with diabetes were randomly
tidase (DPP)-4, nor sodium glucose co-transporter-2 (SGLT2) inhi- allocated to tight (more intensive) or standard blood pressure
bitors have any clinical trial data demonstrating cardiovascular control.85 Followed for 8.4 years, patients in the tight control arm
event reduction. had a significantly lower blood pressure (144/82 mmHg) compared
Ranolazine, a partial fatty acid oxidation inhibitor, improves func- with those in the standard control arm (154/87 mmHg) and had a
tional capacity in patients with stable angina and has been shown to 44% reduction in stroke and a 32% reduction in diabetes-related
improve exercise tolerance similarly in patients with and without dia- death. The choice of first agent, beta-adrenergic blocker or
betes82 but does not reduce cardiovascular outcomes.27 As a partial angiotensin-converting enzyme inhibitor, made no difference in the
Page 6 of 13 J.A. Beckman et al.
outcomes, likely because the majority of patients required more than patients with diabetes have their blood pressure controlled to 130/
one anti-hypertensive agent.85 Interestingly, the efficacy of treatment 80 mmHg or lower, although the report admitted that available data
of hypertension is not as durable as treatment of hyperglycaemia with are somewhat sparse to justify the low target.
metformin. Whereas the benefit of metformin in the first 5 years of The rationale of the Action to Control Cardiovascular Risk in Dia-
treatment persisted and increased over time,76 the benefit of tight betes (ACCORD) trial was to determine with definitive clinical trial
control of blood pressure did not persist once UKPDS had com- evidence whether a more aggressive systolic blood pressure target of
pleted.86 The results suggest that the aggressive treatment of blood ,120 mmHg was superior to a systolic blood pressure target of
pressure must be ongoing for the benefit to be maintained. ,140 mmHg.90 In ACCORD, 4733 patients were enrolled and the
There is general agreement about the benefits of optimal blood goals were achieved: at 1 year, the intensive arm had a mean systolic
pressure control, but not about the definition of optimal. Clinical blood pressure of 119.3 mmHg and the standard group had a blood
trials that were reported around the time of UKPDS provided pressure of 133.5 mmHg.91 After a mean follow-up of 5 years, there
some clue as to the appropriate goal level. In the Hypertension was no significant difference in the primary outcome (non-fatal myo-
Optimal Treatment (HOT) trial, 18 790 patients with diastolic cardial infarction, non-fatal stroke, or death from cardiovascular
blood pressure between 100 and 115 mmHg were randomly causes), death from any cause, or major coronary disease event.
assigned to treatment sufficient to achieve a diastolic blood pressure However, there was a significant 40% reduction in stroke. Also, a sig-
of 90, 85 or 80 mmHg.87 In the patients with diabetes, there was a 51% nificant increase in medication-related adverse events was noted.
reduction in major cardiovascular events in the 80 mmHg target group Subjects in the tight arm required 3.4 medications to achieve the
compared with the 90 mmHg target group. Similarly, in the Appropri- target compared with 2.1 medications in the standard group. We
ate Blood Pressure Control in Diabetes (ABCD) trial, 470 patients with await JNC 8 for any change in the recommended target of 130/
diabetes were randomized to a target diastolic blood pressure of 80 80 mmHg in patients with diabetes.
89 mmHg or a diastolic of 75 mmHg.88 Although cardiovascular events The preferred class of anti-hypertensive in patients with diabetes
did not differ between groups, all-cause mortality was lower in the merits consideration. The choice of agent may be predicated on
more aggressively treated group. Thus, in the Seventh Report of the the presence of complications of diabetes. In the absence of compli-
Joint National Committee (JNC) on Prevention, Detection, Evaluation, cations, ALLHAT, the Antihypertensive and Lipid-Lowering Treat-
and Treatment of High Blood Pressure,89 it was recommended that ment to Prevent Heart Attack Trial, demonstrated no difference in
Diabetes and vascular disease Page 7 of 13
the primary outcome of fatal coronary heart disease or non-fatal or the combination. After a median 56 months of follow-up, there
myocardial infarction among the chlorthalidone, amlodipine, and lisi- was no difference among the groups in the primary outcome of
nopril arms in patients with diabetes.92 Thus, if the primary goal of death from cardiovascular cause, myocardial infarction, stroke, or
treatment is the reduction of blood pressure, then a thiazide diuretic, hospitalization for heart failure in the entire cohort and diabetic sub-
dihydropyridine calcium-channel blocker, or angiotensin-converting group.
enzyme inhibitor (ACE-I) are acceptable first choices. b-adrenergic Inhibitors of the mineralocorticoid receptor have been studied in
antagonists should not be considered as first-line agents for treating large trials in patients with congestive heart failure and left-ventricular
hypertension in most patients. A meta-analysis of 12 studies evaluat- dysfunction after myocardial infarction. In the Randomized Aldac-
ing 94 492 patients found that b-adrenergic blocker therapy was tone Evaluation Study (RALES) trial of patients with severe systolic
associated with a 22% increased risk for new-onset diabetes, and a heart failure, spironolactone reduced mortality by 30% in patients
15% increased risk of stroke compared with non-diuretic anti- with and without diabetes.109,110 Two trials have evaluated the use
hypertensive agents.93 In contrast, b-adrenergic blocker therapy is of eplerenone in patients with reduced left-ventricular systolic func-
recommended for 3 years after myocardial infarction and in the tion, one in patients with mild heart failure and the other in patients
setting of left-ventricular dysfunction, with or without heart failure. after myocardial infarction. In both trials, eplerenone reduced mor-
Moreover, b-adrenergic blocker therapy, titrated to full dose, is tality compared with placebo, and patients with diabetes received
recommended for the treatment of stable angina.94 the same benefit as those without diabetes.111,112
The usefulness of other lipid modification agents, alone or in add- stroke, and peripheral artery disease). Similarly, in the Prevention
ition to statins, in patients with diabetes is not established. Early work of Progression of Arterial Disease and Diabetes (POPADAD) trial,
with fibric acid derivatives alone demonstrated a similar reduction in 1276 adults with type 2 diabetes and an anklebrachial index of
cardiovascular events in patients with and without diabetes in the ,1.0 were randomized to daily aspirin or placebo.139 In this study,
Veterans Affairs High-Density Lipoprotein Cholesterol Intervention there was no significant difference in the composite outcome of
Trial,126 but more recent data have been less compelling. The Feno- death from coronary heart disease or stroke, non-fatal myocardial in-
fibrate Intervention and Event Lowering in Diabetes (FIELD) trial ran- farction or stroke, or above ankle amputation for critical limb ischae-
domized 9795 patients with type 2 diabetes to fenofibrate or mia; or any of its individual components. A meta-analysis of aspirin
placebo,127 but was unable to show a reduction in the primary treatment in only the diabetic subjects in large primary prevention
outcome of coronary events. The lack of efficacy was posited to an studies demonstrated a trend towards a 10% reduction in the cardio-
unequal distribution of statin usage. The use of fenofibrate was asso- vascular disease events.140 Based on the limited data and small, if any
ciated with a reduction in minor amputation,128 although interpret- benefit, the American Diabetes Association, American Heart Associ-
ation of a secondary endpoint without a positive primary endpoint ation, and American College of Cardiology Foundation recommend
should be done with caution. The use of a fibrate in supplement to the use of low-dose aspirin in diabetic patients with a cardiovascular
statin therapy for all subjects with diabetes was studied in the disease risk of .1% per year based on diabetes-based risk calculators
ACCORD Lipid trial.129 In this trial of 5518 patients, all patients like the UKPDS Risk Engine (http://www.dtu.ox.ac.uk/riskengine/
Inhibition and Patient Outcomes (PLATO) trial. In Plato, ticagrelor physician determined the appropriate strategy. Over the course of
was superior to clopidogrel and showed a significant reduction in 5 years of follow-up, there was no difference in survival between
mortality, but the benefit for subjects with diabetes was not different the medical therapy and revascularization arms in total, or by type.
from the cohort as a whole.147,148 Further work is needed to clarify In a secondary outcome, the patients in the coronary artery bypass
these differences among agents and their interaction with diabetes. portion of the study who underwent surgery had a significantly
lower rate of major cardiovascular events (death, MI, or stroke)
The benefit of risk modification in than those allocated to medical therapy. This may have resulted
because the patients in the bypass arm had more triple vessel coron-
aggregate
ary artery disease (52.4 vs. 20.3%). The Future Revascularization
Modifications of each of the risk factors brings reductions in cardio-
Evaluation in Patients with Diabetes Mellitus: Optimal Management
vascular adverse events. Intensive modification of every risk factor
of Multivessel Disease (FREEDOM) trial compared the outcomes
provides additive benefits. In the Steno-2 trial, 160 patients with
in 1900 diabetic subjects with multivessel coronary disease randomly
type 2 diabetes were randomized to intensive therapy or convention-
assigned to percutaneous coronary intervention or coronary artery
al therapy and followed for up to 13 years.149 Intensive therapy was
bypass grafting and followed for a median of 3.8 years.154 Subjects
defined as haemoglobin A1c ,6.5%, total cholesterol ,175 mg/
who underwent surgical bypass had an absolute 7.9% reduction in
dL, fasting serum triglycerides ,150 mg/dL, systolic blood pressure
the primary outcome of death, non-fatal myocardial infarction, and
,130 mmHg, diastolic blood pressure ,80 mmHg, use of low-dose
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