RN Nursing · Medications Affecting the Cardiovascular System
Antiplatelet Agents: Nursing Pharmacology Study Guide
A concise nursing review of antiplatelet drug classes, mechanisms, indications, side effects, and safety priorities. Covers aspirin, clopidogrel, ticagrelor, and dipyridamole with high-yield exam pearls.
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Antiplatelet drugs prevent arterial clot formation and are central to the management of acute coronary syndrome, stroke prevention, and post-stent care. This guide reviews the major agents, how they work, and the nursing priorities — especially bleeding risk — that every student should know for exams and clinical practice.
Antiplatelet Drug Classes
- Aspirin — COX inhibitor — MI and stroke prevention
- Clopidogrel — P2Y12 inhibitor — post-stent therapy
- Ticagrelor — P2Y12 inhibitor — acute coronary syndrome
- Dipyridamole — Platelet inhibitor — stroke prevention
Indications
- Acute coronary syndrome (ACS)
- Post-myocardial infarction
- Stroke prevention
- Post-PCI / stent placement
Mechanism of Action
- Aspirin — Inhibits platelet aggregation (via COX inhibition)
- Clopidogrel — Blocks platelet activation
- Ticagrelor — Reversible platelet inhibition
Common Side Effects
- Aspirin — GI bleeding, tinnitus
- Clopidogrel — Bleeding, bruising
- Ticagrelor — Bleeding, dyspnea
Life-Threatening Risks
- Gastrointestinal bleeding
- Intracranial bleeding
- Hemorrhagic stroke
Labs & Monitoring
- No routine INR or aPTT monitoring required
- Monitor CBC (platelets, hemoglobin)
- Continuously assess for signs of bleeding
Nursing Safety Rules
- Assess stool, urine, and gums for signs of bleeding
- Avoid NSAIDs unless specifically ordered
- Hold medication before surgery if ordered
- Educate patient to report bruising or bleeding promptly
Common Exam Traps
- Confusing antiplatelets with anticoagulants
- Expecting INR or aPTT monitoring (not needed)
- Administering with active bleeding
- Ignoring tinnitus as an early aspirin toxicity sign
- Combining with anticoagulants without caution
Key Takeaways
- Antiplatelets prevent arterial clots — anticoagulants prevent venous clots.
- Aspirin is first-line for MI and stroke prevention.
- Clopidogrel is the go-to agent after stent placement.
- Bleeding is the primary risk across all agents.
- No routine coagulation labs — monitor CBC and clinical bleeding signs.
- Watch for tinnitus with aspirin and dyspnea with ticagrelor.
Test yourself on Antiplatelet Medications
111 practice questions, each with a full teaching rationale.
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