Atherosclerotic Plaque Formation and Treatment Overview
- Begins with small injury to endothelium (causes: hypertension, high cholesterol, high blood sugar, smoking).
- Cholesterol migrates into vessel wall and converts to oxidized form (inflammatory signal).
- Monocytes migrate, transform into macrophages, absorb cholesterol, forming foam cells.
Plaque Development
- Saturated foam cells die, releasing contents (detritus, foamy macrophages, collagen fibers, cholesterol crystals) contributing to plaque.
- Smooth muscle cells transform into fibroblasts, stabilize plaque cap.
- Process is long, causes artery narrowing and hardening, leading to reduced blood flow and health issues (e.g., cerebrovascular accidents).
Treatment: Carotid Endarterectomy
- Effective for atherosclerotic treatment.
- Procedure:
- Small cut along sternocleidomastoid muscle.
- Carefully separate tissues to avoid damage.
- Clamp common and external carotid arteries; measure internal carotid pressure.
- Open artery at plaque site, separate and remove plaque.
- Flush artery, close arteriotomy with sutures or patch.
- Clear air/debris before removing clamps (order: external, common, then internal carotid artery).
Post-Operative Considerations
- Most patients recover without complications.
- Possible temporary side effects: difficulty swallowing, hoarseness, blood pressure fluctuations.
- Restores blood flow, lowers cerebrovascular accident risk.