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.
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