Antianginal Agents

Timing of Administration and Key Terms in Cardiac Health

  • **Key Terms:

    • Angina Pectoris:**

    • Definition: Chest pain caused by unmet oxygen demand of the heart.

    • Etherma:

    • Definition: Fatty tumors that narrow the pathway in arteries, leading to reduced adaptability and increased stiffness of vessels.

    • Atherosclerosis:

    • Definition: Condition where blood vessels accumulate several etheremas, resulting in swelling, decreased elasticity, and loss of responsiveness to body signals.

    • Coronary Artery Disease:

    • Definition: Narrowing of the arteries supplying blood to the heart, reducing oxygen supply to the heart muscle.

  • Myocardial Infarction:

    • Definition: Complete occlusion of a coronary artery, leading to ischemia and death of cardiac muscle cells, which are replaced by scar tissue.

  • Prinzmetal's Angina:

    • Definition: Chest pain due to vasospasm in a coronary artery that decreases blood flow.

  • Pulse Pressure:

    • Definition: The difference between systolic and diastolic pressure; calculated by subtracting diastolic pressure from systolic pressure, indicating the pressure needed to fill coronary arteries.

Types of Angina

  • Stable Angina:

    • Description: Chest pain from an imbalance in cardiac oxygen demand and supply; relieved by decreased physical activity. No tissue damage occurs; can persist for long periods without cell death.

  • Unstable Angina:

    • Description: Chest pain resulting from unmet oxygen demand; pain persists even at rest, indicating a significant risk of complete occlusion; patients should avoid physical activity and seek help if pain does not relieve.

Differences Between Etherma and Atherosclerosis

  • Etherma:

    • Characterized by more flexible, less dense fatty tumors narrowing the arterial lumen.

  • Atherosclerotic Plaque:

    • Progresses from multiple ethermas; these plaques are denser and less flexible than ethermas.

  • Connection:

    • All angina types share the common issue of oxygen demand not being met by the heart.

Symptoms and Gender Differences in Heart Attack

  • Heart Attack Symptoms:

    • Severe discomfort often described as an "elephant on the chest."

    • Men may exhibit classic symptoms:

    • Chest pain, left arm pain, shortness of breath.

    • Women may display less common symptoms:

    • GI upset or jaw pain.

    • Risks:

    • Death of heart tissue leads to less efficient contractions and increases the risk of fatal arrhythmias as the tissue is dying but excitable prior to becoming scar tissue.

Anti-Anginal Medications

  • Function:

    • Anti-anginal medications aim to improve blood delivery to coronary arteries or decrease cardiac demand to meet oxygen requirements.

Types of Anti-Anginal Drugs:

1. Nitrates:

  • Mechanism of Action:

    • Dilate blood vessels and decrease blood pressure, reducing preload and afterload.

    • Types include:

    • Isosorbide Dinitrate

    • Isosorbide Mononitrate

    • Nitroglycerin (for acute angina).

  • Contraindications:

    • Anemia, head trauma, hepatic or renal diseases, low cardiac output conditions.

  • Adverse Effects:

    • Hypotension, dizziness, weakness, flushing, nausea, vomiting, headache.

    • Risk of developing tolerance with continuous use.

  • Drug Interactions:

    • Dangerous combinations with ergot derivatives (hypertension), heparin (decreases effectiveness), PDE-5 inhibitors (severe hypotension).

2. Beta Blockers:

  • Mechanism of Action:

    • Block beta receptors, reducing heart rate and contractility, lowering cardiac output and oxygen demand.

  • Usage:

    • Effective in preventing reinfarction post-myocardial infarction, not suitable for Prinzmetal angina.

  • Contraindications:

    • Patients with a slow heart rate or heart block, shock conditions.

  • Adverse Effects:

    • Depression, decreased exercise tolerance, bronchoconstriction (particularly for asthmatics).

  • Drug Interactions:

    • NSAIDs may reduce effectiveness, antidiabetic agents can mask hypoglycemia.

3. Calcium Channel Blockers:

  • Mechanism of Action:

    • Prevent calcium flow through cells, decreasing muscle contraction, leading to vasodilation and decreased peripheral resistance.

  • Types:

    • Non-Dihydropyridine: For myocardial selective effects, arrhythmias, and angina.

    • Dihydropyridine: More vascular selective, used for hypertension and angina.

  • Adverse Effects:

    • Arrhythmias, dizziness from hypotension, GI upset, flushing, headaches, rashes.

  • Drug Interactions:

    • Specific medications like diltiazem with cyclosporine and verapamil with digoxin can lead to dangerous interactions.

Patient Education and Medication Management

  • Patient Instructions:

    • Advised use in certain situations to manage angina effectively (such as pre-activity dosing).

    • Teach correct medication use, lifestyle modifications, and the importance of adhering to a scheduled follow-up.

    • Anti-anginal medications should be avoided in pregnancy or lactation; care must be taken with dosage in children and older adults to minimize adverse effects.

  • Emergency Instructions:

    • Patients should seek emergency treatment if angina pain persists after three doses of nitroglycerin taken every five minutes.

    • Education on lifestyle changes for preventing angina is crucial.

  • Monitoring:

    • Continuous monitoring for adverse effects, especially when on multiple antianginal medications; ensure awareness of how to manage blood pressure changes to prevent falls or syncope.

Conclusion and Follow-Up

  • Final Notes:

    • Emphasize the importance of follow-up appointments to monitor effectiveness and adjust treatment as necessary.

    • Educating patients on medication adherence can significantly improve their quality of life and outcomes.

  • Facilitator's Contact:

    • Students may reach out with questions regarding any of the discussed topics.