(Circulation. 1997;95:1683-1685.)
© 1997 American Heart Association, Inc.
Articles |
Key Words: AHA Medical/Scientific Statements diet cholesterol prevention drugs
| Introduction |
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The National Cholesterol Education Program (NCEP)1 calls for intensive cholesterol-lowering therapy in patients with any form of clinical atherosclerotic disease, specifically, acute myocardial infarction or angina pectoris, coronary artery angioplasty, peripheral arterial disease, abdominal aortic aneurysm, symptomatic carotid artery disease, or a history of coronary artery bypass graft. These patients carry a fivefold to sevenfold elevated risk for developing new or recurrent CHD and thus need intensive risk reduction. Despite the proven benefit of cholesterol-lowering therapy in patients with CHD, many patientsup to two thirdsreceive no therapy to lower LDL cholesterol levels (National Heart, Lung, and Blood Institute; unpublished data; 1995). These patients are being deprived of valuable treatment that will decrease the likelihood of their having recurrent thrombotic events. A majority have LDL cholesterol concentrations well above optimal levels. The 4S and CARE trials3 5 clearly document risk reduction as soon as 2 years after starting cholesterol-reducing therapy; some angiographic trials suggest even earlier benefit from cholesterol-lowering therapy.4 7 Consequently, aggressive cholesterol management should be started as soon as the diagnosis of clinical atherosclerotic disease is established.
According to current guidelines, the goal of therapy in patients with
clinical atherosclerotic disease, including CHD, is to decrease LDL
cholesterol to
100 mg/dL. This level is considered optimal for
patients with CHD by the NCEP Expert Panel,1 the American
Heart Association Secondary Prevention Panel,9 and the
American College of Cardiology.9 10 The consensus opinion
on the optimal target goal for LDL cholesterol in patients with
atherosclerotic disease is supported on both theoretical and
experimental grounds, including clinical trials.3 4 5 6 7 8
Before starting LDL-lowering therapy at any level, a baseline should be established to ensure better monitoring of therapeutic results. At least two or preferably three fasting lipoprotein measurements11 provide the most accurate baseline. Sampling can be done on consecutive days. Several studies12 13 14 15 suggest that plasma lipoprotein measurements made immediately upon admission to the hospital for acute coronary events provide a reasonable estimate of baseline cholesterol levels. These values can be used to alert physicians to patients who are possible candidates for cholesterol-lowering drugs. However, metabolic stability is required before initiating cholesterol-lowering drug therapy in patients who have had a recent coronary event. Sometimes during an acute event the LDL cholesterol level falls below the true baseline; it should return to baseline after a few weeks. The same holds true for patients undergoing surgical revascularization; their lipid and lipoprotein levels should be evaluated 2 to 3 months after surgery.16 If laboratory values (eg, liver function test) are abnormal in the period surrounding an acute event, a 6-week waiting period to allow for a return to normal metabolic function is prudent. If cholesterol-reducing agents are started while a patient is metabolically unstable, evaluation for possible drug toxicity can be compromised. On the other hand, if the patient is metabolically stable at discharge, consideration can be given to starting drug therapy. Before starting drugs in patients with high levels of lipids and lipoproteins, however, secondary causes of hypercholesterolemiahypothyroidism, nephrotic syndrome, and obstructive liver diseaseshould be ruled out.
| General Approach |
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7% of total calories) and cholesterol (to
<200 mg/d), weight loss in persons who are overweight, and physical
activity appropriate for cardiac status.1 Individualized
dietary therapy by a registered dietitian or other qualified
nutritional professional will often improve dietary adherence. Maximal
dietary therapy typically reduces LDL cholesterol levels by 15 to 25
mg/dL.1 In addition to dietary change, cardiac
rehabilitation programs are valuable for instituting optimal physical
activity. Maximal dietary therapy should be started and continued even
when cholesterol-lowering drugs are used; dietary therapy enhances drug
actions and helps reduce risk for recurrent events through other
mechanisms.
If the baseline LDL cholesterol level in patients with CHD is >130
mg/dL, cholesterol-lowering drug therapy is often needed in addition to
maximal nonpharmaceutical therapy to achieve the target LDL cholesterol
level of
100 mg/dL. Withholding drug therapy in an effort to reach
target LDL level with the nonpharmaceutical approach is not necessary.
The major drugs used for LDL reduction are statins, bile acid
sequestrants, and nicotinic acid. Large clinical trials have documented
that these agents are safe in the vast majority of
patients.3 4 5 17 18 19 The choice and dose of drug
depends on the baseline LDL cholesterol level as well as lipoprotein
patterns. If LDL cholesterol is only slightly above 130 mg/dL, low
doses of drug combined with dietary change may be sufficient to reach
the target LDL level. Greater LDL elevations will require more
aggressive drug therapy. In patients with definite
hypercholesterolemia, combined drug therapy, eg, statin plus
sequestrant, may be needed to achieve the LDL level of
100 mg/dL. If
the LDL cholesterol concentration declines to 100 to 129 mg/dL on
single-drug therapy, the physician must consider efficiency, cost, and
side effects before prescribing a second drug to obtain an LDL level
100 mg/dL.1
If the baseline LDL cholesterol level in patients with CHD ranges from 100 to 129 mg/dL, maximal dietary therapy alone can be tried for 6 weeks. If LDL does not decrease to <100 mg/dL with diet alone, clinical judgment will be needed to determine whether to initiate drug therapy.1 Many patients with CHD and a baseline LDL cholesterol level ranging from 100 to 129 mg/dL have a low HDL cholesterol level (<35 mg/dL). In such patients, nicotinic acid can be considered for first-line therapy because of its potential for increasing HDL.1 Alternatively, a statin can be used to reduce LDL cholesterol levels to well below 100 mg/dL.20 The aim is to produce an extra low LDL cholesterol level to offset the increased risk associated with low HDL.
| Timeliness of Approach |
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Other candidates for cholesterol-reducing therapy are first identified
when they experience an acute coronary event, ie, unstable angina or
myocardial infarction. Many of these patients will immediately come
under the care of a cardiovascular specialist. Because
cholesterol-lowering therapy appears to be highly efficacious for
reducing risk for recurrent coronary syndromes, its initiation at the
time of discharge from the hospital can be considered, provided the
patient is metabolically stable. As mentioned above, if LDL cholesterol
is
130 mg/dL at time of discharge, a cholesterol-reducing drug can
reasonably be started simultaneously with nonpharmaceutical therapy. On
the other hand, if LDL cholesterol is <130 mg/dL at discharge, the LDL
level should be reevaluated after 6 weeks of maximal dietary
therapy.
One important issue concerns responsibility for initiating cholesterol-lowering therapy in the setting of acute coronary events. Divided responsibility often leads to no therapy at all. The following approach seems reasonable: The cardiovascular specialist or attending physician should be responsible for starting some form of cholesterol-lowering therapy in patients upon discharge from the hospital after acute coronary events. Failure to do so can convey a message to the patient's follow-up physician that cholesterol management is not necessary. The cardiovascular specialist thus should ensure that appropriate therapy is initiated and maintained. Interaction between the cardiovascular specialist and primary care physician will further assure that cholesterol management is initiated and continued and that the patient is monitored for drug toxicity.
| Summary |
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100 mg/dL)
is unlikely to be achieved in the near term by a nonpharmaceutical
approach alone. The view that patients with CHD or other forms of
atherosclerotic disease do not receive substantial clinical benefits
from aggressive cholesterol-lowering therapy is no longer warranted.
Intensive cholesterol reduction, initiated immediately, has the
potential to significantly reduce both morbidity and mortality.
Cholesterol-lowering therapy thus should become a routine part of
clinical management to reduce risk of future coronary events and to
prolong life in patients with CHD or other forms of atherosclerotic
disease.
| Footnotes |
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A single reprint is available by calling 800-242-8721 (US only) or writing the American Heart Association, Public Information, 7272 Greenville Avenue, Dallas, TX 75231-4596. Ask for reprint No. 71-0105.
| References |
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