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Comprehensive Overview of Calcium Channel Blockers: Mechanisms, Uses, and Management

Detailed insights into calcium channel blockers including classification, mechanisms, clinical applications, adverse effects, and overdose management.

Healthcare◦
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Calcium Channel Blockers (CCBs)
Learning Objectives • Classification, mechanism, pharmacology, indications, adverse effects, and clinical applications.
Introduction • CCBs inhibit L-type calcium channels, reducing calcium influx into cardiac and smooth muscle cells.
Role of Calcium in Cardiovascular Physiology • Calcium is essential for excitation-contraction coupling and vascular tone.
Classification of CCBs • Dihydropyridines vs Non-dihydropyridines.
Dihydropyridines • Amlodipine, Nifedipine, Felodipine, Nicardipine, Clevidipine.
Non-Dihydropyridines • Verapamil and Diltiazem.
Mechanism of Action • Block L-type calcium channels in vascular smooth muscle and myocardium.
Effects on Blood Vessels • Arterial vasodilation decreases systemic vascular resistance.
Effects on the Heart • Reduced heart rate, AV conduction, and myocardial contractility.
Pharmacokinetics • Absorption, metabolism, and elimination characteristics.
Hemodynamic Effects • Reduced afterload and myocardial oxygen demand.
Amlodipine • Long-acting DHP commonly used in hypertension and angina.
Nifedipine • Potent vasodilator; extended-release preparations preferred.
Verapamil • Strong AV nodal suppression and negative inotropic effect.
Diltiazem • Intermediate cardiac and vascular effects.
Indications: Hypertension • Effective first-line antihypertensive agents.
Indications: Angina • Stable angina and vasospastic angina.
Indications: Arrhythmias • SVT, rate control in atrial fibrillation/flutter.
Other Uses • Raynaud phenomenon, hypertrophic cardiomyopathy, migraine prophylaxis.
Adverse Effects of DHPs • Peripheral edema, flushing, headache, dizziness.
Adverse Effects of Non-DHPs • Bradycardia, AV block, constipation, worsening heart failure.
Drug Interactions • Beta-blockers, digoxin, CYP3A4 inhibitors and inducers.
Contraindications • Severe hypotension, cardiogenic shock, advanced AV block.
CCBs in Critical Care • Nicardipine and clevidipine for hypertensive emergencies.
CCB Toxicity • Hypotension, bradycardia, shock, hyperglycemia.
Management of CCB Overdose • Calcium, insulin-euglycemia therapy, vasopressors, lipid emulsion.
Comparison Table • DHPs: vascular selective. • Non-DHPs: greater cardiac effects.
Clinical Case • Hypertensive patient treated with amlodipine.
Key Take-Home Messages • Know classes, indications, adverse effects, and toxicity management.