Management of Mild‑to‑Moderate Complex Carotid Plaque

Definition and Imaging Characteristics

Complex carotid plaque is defined by heterogeneous composition (e.g., lipid‑rich necrotic core, intraplaque hemorrhage, mixed echogenicity) as seen on ultrasound, distinguishing it from simple fibrous plaques【1】.
Mild‑to‑moderate carotid stenosis corresponds to 50 %–69 % luminal narrowing on imaging【2】.

In patients with asymptomatic mild‑to‑moderate stenosis, the annual risk of stroke is approximately 2.6–4.9 events per 100 person‑years【3】.
The presence of diabetes mellitus or established cardiovascular disease raises the annual stroke risk to roughly 2.5 %【3】.

Initiate intensive triple therapy immediately: high‑intensity statin, antiplatelet agent, and strict blood‑pressure control【4】.
High‑intensity statin therapy (e.g., atorvastatin 80 mg daily) should aim for LDL‑cholesterol < 70 mg/dL (or < 55 mg/dL in very high‑risk individuals)【5】.
For asymptomatic disease, prescribe single‑agent aspirin 75–325 mg daily; if the patient becomes symptomatic (stroke, TIA, or amaurosis fugax), add clopidogrel 75 mg daily for at least 21 days【5】.
Maintain systolic/diastolic blood pressure < 140/90 mmHg with appropriate antihypertensive therapy【5】.
Implement risk‑factor modification, including glycemic control for diabetics and smoking cessation【5】.

Perform duplex ultrasound surveillance to monitor plaque progression; the risk of progression from mild‑to‑moderate to severe stenosis is about 30 % over time【2】.
Repeat duplex ultrasound at least annually to reassess stenosis severity and plaque characteristics【2】.

Carotid endarterectomy or stenting is indicated only when the patient develops ipsilateral symptomatic disease (stroke, TIA, or amaurosis fugax within the prior 6 months) and stenosis is ≥70 % on non‑invasive imaging【5】.
For asymptomatic patients, even with severe stenosis, the benefit of revascularization is uncertain when modern optimal medical therapy is applied【2】.

When revascularization is warranted, the procedure should be performed within 14 days of the neurological event, preferably within the first few days, to achieve maximal benefit【5】.
Delaying revascularization beyond 14 days markedly diminishes therapeutic advantage【5】.