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Cholesterol Lowering Guidelines: From Whence We Came and Where We Are Now
1Division of Cardiology, Zuckerberg San Francisco General Hospital, and the Department of Medicine, University of California, San Francisco, San Francisco, California, USA.
Insights
Cardiology cholesterol guidelines have evolved significantly, driven by clinical trials, not just observational data. Lowering low-density lipoprotein cholesterol is increasingly emphasized for better patient outcomes, especially in secondary prevention.
Area of Science:
- Cardiology
- Clinical Trials
- Evidence-Based Medicine
Background:
- Cardiology treatment guidelines often lack robust clinical trial evidence.
- The definition of normal cholesterol has shifted, with lower levels considered optimal.
- Historical guidelines from 1988 recommended diet followed by medication.
Purpose of the Study:
- To review the evolution of cholesterol treatment guidelines in cardiology.
- To highlight the impact of clinical trials, particularly statins, on guideline changes.
- To emphasize the importance of absolute risk reduction in treatment decisions.
Main Methods:
- Review of historical and contemporary cardiology treatment guidelines.
- Analysis of the influence of clinical trial data on guideline development.
- Examination of trends in low-density lipoprotein cholesterol targets.
Main Results:
- Guideline recommendations are frequently not supported by clinical trial evidence.
- Cholesterol targets have progressively lowered over 25 years.
- Low-density lipoprotein cholesterol targets have been abandoned in some guidelines.
- Absolute risk reduction is a rational approach for selecting patients for treatment.
Conclusions:
- Cardiology guidelines have evolved dramatically due to clinical trials.
- Lowering cholesterol, particularly low-density lipoprotein, is crucial for cardiovascular health.
- Untreated or undertreated patients in secondary prevention represent a significant opportunity for improved outcomes.
Abstract:
Treatment guidelines have proliferated in cardiology, although most guideline recommendations are not supported by clinical trial evidence. What is considered to be a normal cholesterol level has progressively declined over the past 50 years, with the increasing realization that "normal" is far from optimal and that lower is better. The first important United States and Canadian cholesterol guidelines were published in 1988, and recommended diet for 6 months to be followed by consideration of bile acid sequestrants or nicotinic acid. Over the ensuing 25 years guidelines have changed rapidly and dramatically in response to a large number of definitive clinical trials, usually with statins. Low-density lipoprotein cholesterol targets have moved progressively lower, and in some guidelines, have been abandoned entirely. The concept of selecting patients for treatment according to the absolute risk reduction expected from treatment on the basis of clinical trial data seems to be a rational approach. For secondary prevention, some patients are still untreated or undertreated, presenting an opportunity for improving outcomes.
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