Overview
This lecture covers high cholesterol (hyperlipidemia), its relevance to dental treatment, key lipoproteins, medication interactions, and related oral manifestations.
High Cholesterol (Hyperlipidemia)
- Hyperlipidemia is high levels of lipids (fats) in the blood.
- Lipids include cholesterol and triglycerides, essential for hormone synthesis and cell membrane integrity.
- Cholesterol is the precursor for steroid hormones and vital for cell membranes.
- Triglycerides can be used for energy or converted to membrane phospholipids.
Lipoproteins: HDL and LDL
- Lipoproteins are particles carrying cholesterol and triglycerides in the blood.
- HDL (High Density Lipoprotein) has more protein, less lipid, and removes excess cholesterol from tissues; ideal level: >50 mg/dL.
- LDL (Low Density Lipoprotein) has more lipid, less protein, and deposits cholesterol in arterial walls; ideal level: <130 mg/dL.
Cardiovascular Risks
- Lipids in artery walls can lead to atherosclerosis (fatty plaque buildup).
- Plaques narrow arteries and block vasodilation, raising blood pressure and cardiac risk.
- High cholesterol increases risks for heart attack, stroke, and hypertension.
Cholesterol Medications (Statins)
- Statins inhibit HMG-CoA reductase, decreasing liver cholesterol synthesis and mainly lowering LDL.
- Statins do not affect dietary cholesterol.
- Examples include drugs ending in "-statin."
Dental Treatment Considerations
- Statin users should avoid antibiotics (erythromycin, clarithromycin) and antifungals (ketoconazole, fluconazole, itraconazole) metabolized by certain liver enzymes to prevent toxic side effects.
- Potential side effects of statins: muscle pain, rhabdomyolysis, acute kidney failure.
- Patients with poorly controlled hyperlipidemia, hypertension, or diabetes may need dental treatment deferred and medical referral.
- No standard chairside test for HDL/LDL; assess other health indicators or consult physician.
Oral Manifestations
- Hyperlipidemia increases risk of pulp stones (calcifications in tooth pulp), complicating root canals.
- Statins may cause muscle symptoms affecting chewing or breathing.
- Possible link between hyperlipidemia and periodontal disease, unclear causality.
Key Terms & Definitions
- Hyperlipidemia — elevated levels of lipids (fats) in the blood.
- Lipoproteins — protein-fat complexes that transport cholesterol and triglycerides in the blood.
- HDL (High Density Lipoprotein) — "good" cholesterol that removes cholesterol from tissues.
- LDL (Low Density Lipoprotein) — "bad" cholesterol that deposits cholesterol in arteries.
- Statins — drugs that inhibit cholesterol synthesis in the liver by blocking HMG-CoA reductase.
- Atherosclerosis — buildup of fatty plaques within arterial walls.
Action Items / Next Steps
- Review dental drug interactions for patients taking statins.
- Consult patient's physician if uncertain about cardiovascular risk or comorbidities.
- Monitor for oral signs like pulp stones in patients with hyperlipidemia.