Management of high-risk populations with coronary artery disease: rationale for improving prognosis in the elderly

P. Meurin
Centre de Réadaptation Cardiaque de la Brie, Villeneuve Saint Denis, France

Correspondence: Dr P. Meurin, Centre de Réadaptation Cardiaque de la Brie, 77174 Villeneuve Saint Denis, France. Tel: +33 160 43 59 59, e-mail: philippemeurin@tfou.com

Introduction
The prevalence of ischemic heart disease increases continuously with aging and is becoming a major problem in the elderly and the leading cause of death in this age group.[1] The management of acute coronary syndromes, especially acute myocardial infarction, in elderly patients is challenging and represents a major growing health problem. Those at highest risk of acute myocardial infarction are clearly the elderly, who account for more than half of all deaths among hospitalized patients. Elderly patients are prone to have multivessel disease, prior myocardial infarction, diminished ejection fraction, increased risk of cardiac rupture, and more comorbidities.[2–6]
Although an elevated risk of morbidity is observed in the elderly undergoing PTCA combined with stenting, this therapeutic approach should be utilized more aggressively in these patients, since there is a significant benefit of reduction in mortality and disabling stroke in this population, in comparison with fibrinolytic and/or medical treatment alone.[6]
Primary angioplasty and/or stenting can be used in the elderly and is associated with a lesser risk of hemorrhagic stroke or major bleeding. Nonthrombolytic therapies such as revascularization procedures are preferred in the appropriate settings and should be strongly considered when there is marked concern about hemorrhagic stroke or major bleeding, particularly in patients with absolute or relative contraindications to thrombolytic therapy.
Stable angina pectoris occurs frequently in the elderly, affecting some 25% of patients over the age of 75. Elderly patients with stable angina are at significantly higher absolute risk of cardiovascular events and death. In this population, the higher risk of complications associated with revascularization procedures favors the need for a pharmacological approach to the treatment of stable angina.

Aims of treatment in elderly populations with angina pectoris
Treatment of stable angina aims to significantly decrease the severity and frequency of episodes of angina and to increase the functional capacity, with few or no adverse effects, in order to improve quality of life, which is of paramount importance in this population.[3]
The general approach to adequate management of elderly patients includes education, lifestyle modification, and conservative management of coronary artery disease by medical therapy in most cases.

Choice of drug therapy in the elderly
Antianginal therapy can improve symptoms by increasing blood flow in ischemic areas of the myocardium, by reducing myocardial oxygen demand, or by protecting the metabolism of myocardial cells. The high proportion of elderly patients with multiple coexisting medical conditions also requiring treatment and the frequent alterations in hepatic and renal function should be taken into consideration when selecting drug therapy.
In general, the elderly are more sensitive to drugs and more prone to serious adverse events. Because of prescriptions for concomitant disease, they are more likely to experience deleterious drug interactions.[3,4,7,8]
Elderly patients treated with hemodynamic agents (nitrates, b-blockers, calcium channel blockers) are often exposed to adverse effects. Nitrates are potent vasodilators, acting by venous and, to a lesser extent, arterial dilatation. In elderly patients, baroreceptor function decreases with aging and nitrates may lead to an increase in postural adverse effects which may be poorly tolerated. b-Blockers expose to bradycardia, conduction disturbances, and hypotension at lower doses than in younger patients. As regards calcium channel blockers, patients treated by phenylalkylamines (eg, verapamil) or benzothiazepines (eg, diltiazem) are also exposed to bradycardia and atrioventricular block. With dihydropyridines, decreased hepatic first-pass metabolism in the elderly can lead to raised plasma concentrations of the drug. As with all hemodynamic drugs in the elderly, symptomatic hypotension is a concern due to a higher risk of falls and consequent fractures, and a high risk of thromboembolic complications.[3] Therefore, elderly patients treated with hemodynamic drugs should be closely monitored. The general prescribing rules for these drugs are: start at a lower dose than for younger patients; carefully look for any adverse effects; and be prepared to change to another drug if the effects prove troublesome.
The development of a new class of metabolic agents promises a favorable prospect for the management of patients with coronary artery disease, especially the elderly.

Trimetazidine: a specific metabolic mechanism of action
Changes in cardiac metabolism are an inevitable step in the ischemic cascade that leads to the development of coronary artery disease. A better understanding of the pathophysiology of myocardial ischemia has paved the way for the development of a new therapeutic approach in the form of metabolic antianginal agents, first among which is trimetazidine (Vastarel 20). Trimetazidine has been proven to exert antianginal properties due to its specific metabolic mechanism of action. It reduces the metabolic damage that occurs during ischemia and provides cytoprotection through improvement in the metabolic status of myocytes. The efficacy and tolerability of trimetazidine have been proven in numerous clinical trials in both monotherapy and combination therapy in patients with chronic stable angina. Trimetazidine was the first metabolic agent to be quoted by the European Society of Cardiology guidelines on the management of stable angina pectoris. The specific metabolic mechanism of action of trimetazidine, which does not alter hemodynamic parameters, offers a strong rationale for treating elderly patients with coronary artery disease. The potential benefits of trimetazidine in elderly coronary patients have been recently confirmed in terms of efficacy, tolerability, and improvement in quality of life.
The TRIMPOL-1 (Trimetazidine in Poland) substudy[9] assessed the efficacy and safety of trimetazidine in elderly patients (>65 years) with coronary artery disease. In this open-label, daily-practice-based study, 71 patients receiving a hemodynamic drug (nitrate,
b-blocker, or calcium channel blocker) were given trimetazidine 20 mg tid. Trimetazidine significantly improved all exercise parameters (time to onset of angina, total exercise duration, time to 1-mm ST-segment depression) (Figures 1 and 2). Tolerance was excellent and no patient treated with trimetazidine withdrew due to adverse events.

Figure 1. Significant increase in exercise duration in elderly coronary patients taking trimetazidine 20 mg tid.
Figure 2. Significant increase in time to 1-mm ST-segment depression in elderly coronary patients taking trimetazidine 20 mg tid.

The efficacy and acceptability of trimetazidine have been confirmed by Kölbel and Bada (unpublished data) in 120 elderly coronary patients (65–86 years) resistant to hemodynamic monotherapy. At 12 weeks’ follow-up, trimetazidine 20 mg tid significantly improved all exercise parameters (1-mm ST-segment depression, exercise duration). Patient-assessed quality of life was rated good or excellent in 89% of cases. Only two minor adverse events (gastric pain and dyspepsia) were reported.

Summary
Coronary artery disease in the elderly represents a growing health care problem. Since revascularization procedures carry a high risk of morbidity, a conservative therapeutic approach is recommended in this population. Use of conventional hemodynamic agents can be inappropriate due to drug interactions, concomitant diseases, and severe adverse events. Trimetazidine, the first of a new class of metabolic agents known as 3-KAT inhibitors, has proven to be effective and well tolerated in elderly coronary patients. This is due to its original and specific mechanism of action which confers a direct myocardial cytoprotective effect, free of any hemodynamic effects and drug interaction. This promising approach improves the symptoms and quality of life of this at-risk population.

REFERENCES
 

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Demographics of the prevalence, incidence, and management of coronary heart disease in the elderly and in women.

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Evans Memorial Department of Research and Department of Medicine, University Hospital, Boston University School of Medicine, MA.

Cardiovascular disease constitutes an expanding problem in the elderly because of the increasing size of the aged population. Atherosclerosis, hypertension, and diabetes are responsible for the predonderance of cardiovascular disease, which causes 70% of all deaths beyond age 75. Coronary heart disease (CHD) is the most common and most lethal cardiovascular event in both sexes, exacting a large toll in disability and deteriorated quality of life in old age. Unrecognized myocardial infarctions are especially common and are as serious as symptomatic infarctions. beyond age 65, women are as vulnerable to cardiovascular death as men. The predisposing modifiable risk factors for coronary disease, stroke, peripheral arterial disease, and cardiac failure are similar in young and old and in men and women. These include hypertension, dyslipidemia, impaired glucose tolerance, physical indolence, and cigarette smoking. An attenuated risk ratio for some risk factors is offset by a greater incidence of cardiovascular events in advanced age so that the attributable risk and the potential benefit of treatment rise with age. Because the major risk factors predict CHD as efficiently in the elderly as in the young, and the decline in cardiovascular mortality has included the elderly, preventive efforts in the elderly may have substantial potential benefit. At advanced age, total cholesterol levels are considerably higher in women than in men. Some 10 million elderly, two-thirds of whom are women, may require investigation and treatment for elevated lipid levels, as determined by National Heart, Lung, and Blood Institute (NHLBI) guidelines. Because of the preponderance of women in the elderly population, trials of the efficacy of correcting risk factors in general, and lipids in particular, should include women.

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Wenger NK.

Emory University School of Medicine, Division of Cardiology, Atlanta, GA 30303, USA.

Cardiovascular disease is the leading cause of death world-wide in populations older than 65 years of age. The variation in cardiovascular mortality rates in this population indicates a substantial potential for effective coronary prevention. The highest risk for development of coronary heart disease is in individuals older than 65 years of age; many of the risk factors for coronary disease are modifiable, such that an older population may benefit substantially from a preventive program aimed at reducing coronary heart disease. The promotion of cardiovascular health at elderly age requires emphasis on the adoption of healthy lifestyles and the use of pharmacologic intervention when appropriate.

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Optimal treatment of angina in older patients.

Doughty RN, Sharpe N.

Department of Medicine, University of Auckland School of Medicine, New Zealand.

Ischaemic heart disease is a major problem in the elderly. Compared with younger patients, coexisting medical conditions are more common and the patients are more likely to be receiving multiple drugs. In addition, drug pharmacodynamics are altered in the elderly and this needs to be carefully considered when commencing treatment for angina. In practice, the general principles of management of elderly patients with angina are similar to that of younger patients. However, particular care needs to be taken with the therapeutic regimens used. This article reviews the approach to the treatment of stable exertional angina in the elderly.

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Angina pectoris in the elderly.

Fleg JL.

Laboratory of Cardiovascular Science, National Institute on Aging, Baltimore, Maryland.

Although the ability to document angina pectoris in the elderly patient may be compromised by atypical symptoms, limited activity levels, and blunted recall, anginal symptoms convey a similar adverse prognosis regardless of age. In general, the therapeutic approach to the older anginal patient should be dictated more by achievement of symptomatic relief than by considerations of long-term survival. No randomized trial exists to guide the decision of medical versus coronary artery bypass surgery versus angioplasty in the older patient with coronary artery disease; symptomatic relief, however, appears greater after revascularization procedures.

Publication Types:
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PMID: 2029703 [PubMed - indexed for MEDLINE]

 
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Vaitkus PT, Witmer WT, Adele C.

Cardiology Unit, University of Vermont College of Medicine, Burlington, USA.

We sought to determine if differences exist between interventional and noninterventional cardiologists in the perception of risk of revascularization procedures and to compare the physicians' estimates with a computer-based predictor formula from a large regional database. We found that interventional cardiologists perceived greater risk of percutaneous transluminal coronary angioplasty-related morbidity and mortality than noninterventionalists and that these differences were accentuated in female patients, the elderly, and the most seriously ill patients.

PMID: 9264430 [PubMed - indexed for MEDLINE]
 
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Rich MW.

Washington University School of Medicine, St Louis, Missouri, USA.

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Epidemiology of adverse drug events in the nursing home setting.

Monette J, Gurwitz JH, Avorn J.

Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.

There is widespread concern about the level of use, particularly the inappropriate use, of drugs among elderly residents of nursing homes. Medication consumption by these individuals is among the highest of any patient population; residents of nursing homes are prescribed an average of 5 to 8 regularly scheduled medications in addition to those drugs prescribed on an as needed ('prn') basis. Ideally, drug therapy should result in beneficial effects and improved quality of life for patients. However, the development of adverse drug events (ADEs) can compromise the expected benefits of pharmacotherapy for the individual nursing-home resident and may represent a public health problem of considerable magnitude.

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PMID: 8535050 [PubMed - indexed for MEDLINE]

 
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The antiischemic effects and tolerability of trimetazidine in coronary diabetic patients. A substudy from TRIMPOL-1.

Szwed H, Sadowski Z, Pachocki R, Domzal-Bochenska M, Szymczak K, Szydlowski Z, Paradowski A, Gajos G, Kaluza G, Kulon I, Wator-Brzezinska A, Elikowski W, Kuzniak M.

National Institute of Cardiology, Warsaw, Poland.

Diabetes mellitus, a disease with a wide prevalence, has major cardiovascular effects, being a risk factor for the development of ischemic heart disease and congestive heart failure. The aim of this open, multicenter study was to assess the antiischemic efficacy and tolerability of trimetazidine, a metabolic agent acting at the myocardial mitochondrial level, in diabetic patients with stable effort angina treated previously with a single conventional antianginal drug. Fifty diabetic patients (mean age 58 years) with proven coronary artery disease, stable effort angina for at least 3 months, and positive, comparable results of two initial treadmill exercise tests separated by a 1-week interval were included in the study. They continued their conventional antianginal monotherapy with a long-acting nitrate, beta-blocker, or calcium channel blocker. After stabilization, 4-week therapy with trimetazidine, three times daily, 20 mg was initiated in combination with previous treatment. The results showed a significant improvement in exercise tolerance (440.2 vs. 383.2 s; P < 0.01), time to 1-mm ST-segment depression (358.3 vs. 301.6 s; P < 0.01), time to onset of anginal pain (400.0 vs. 238.3 s; P < 0.01), and total work (9.39 vs. 8.67 metabolic equivalents, P < 0.01). Maximal ST-segment depression was attenuated compared with baseline (1.82 vs. 1.91 mm). Other findings included a significant decrease in the mean frequency of anginal episodes (3.06 vs. 4.79 per week; P < 0.01) and in mean nitrate consumption (2.29 vs. 4.2 doses/week). These results suggest that trimetazidine may be effective and is well tolerated as combination therapy for diabetic coronary artery disease patients uncontrolled with a single hemodynamic agent.

Publication Types:
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  • Multicenter Study


PMID: 10439884 [PubMed - indexed for MEDLINE]


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