The purpose of this guideline is to provide direction for the management of patients with high blood cholesterol to decrease the incidence of atherosclerotic vascular disease. The update was undertaken because new evidence has emerged since the publication of the 2013 ACC/AHA cholesterol guideline about additional cholesterol-lowering agents including ezetimibe and PCSK9 inhibitors.
Dr. Gregory Palko and Dr. Neil Skolnik
Measurement and therapeutic modalities
In adults aged 20 years and older who are not on lipid-lowering therapy, measurement of a lipid profile is recommended and is an effective way to estimate atherosclerotic cardiovascular disease (ASCVD) risk and documenting baseline LDL-C.
Statin therapy is divided into three categories: High-intensity statin therapy aims for lowering LDL-C levels by more than 50%, moderate-intensity therapy by 30%-49%, and low-intensity therapy by less than 30%.
Cholesterol management groups
In all individuals at all ages, emphasizing a heart-healthy lifestyle, meaning appropriate diet and exercise, to decrease the risk of developing ASCVD should be advised.
Individuals fall into groups with distinct risk of ASCVD or recurrence of ASCVD and the recommendations are organized according to these risk groups.
Secondary ASCVD prevention: Patients who already have ASCVD by virtue of having had an event or established diagnosis (MI, angina, cerebrovascular accident, or peripheral vascular disease) fall into the secondary prevention category:
- Patients aged 75 years and younger with clinical ASCVD: High-intensity statin therapy should be initiated with aim to reduce LDL-C levels by 50%. In patients who experience statin-related side effects, a moderate-intensity statin should be initiated with the aim to reduce LDL-C by 30%-49%.
- In very high-risk patients with an LDL-C above 70 mg/dL on maximally tolerated statin therapy, it is reasonable to consider the use of a non–statin cholesterol-lowering agent with an LDL-C goal under 70 mg/dL. Ezetimibe (Zetia) can be used initially and if LDL-C remains above 70 mg/dL, then consideration can be given to the addition of a PCSK9-inhibitor therapy (strength of recommendation: ezetimibe – moderate; PCSK9 – strong). The guideline discusses that, even though the evidence supports the efficacy of PCSK9s in reducing the incidence of ASCVD events, the expense of PCSK9 inhibitors give them a high cost, compared with value.
- For patients more than age 75 years with established ASCVD, it is reasonable to continue high-intensity statin therapy if patient is tolerating treatment.
Severe hypercholesterolemia:
- Patients with LDL-C above 190 mg/dL do not need a 10-year risk score calculated. These individuals should receive maximally tolerated statin therapy.
- If patient is unable to achieve 50% reduction in LDL-C and/or have an LDL-C level of 100 mg/dL, the addition of ezetimibe therapy is reasonable.
- If LDL-C is still greater than 100mg/dL on a statin plus ezetimibe, the addition of a PCSK9 inhibitor may be considered. It should be recognized that the addition of a PCSK9 in this circumstance is classified as a weak recommendation.