Dual Antiplatelet Therapy Precautions

# Patient Instruction Note: Dual Antiplatelet Therapy (DAPT) After Coronary Stenting ## What Is Dual Antiplatelet Therapy? After a coronary stent is placed, you will be prescribed **two blood-thinning medications** (usually aspirin plus a second medicine like clopidogrel, ticagrelor, or prasugrel). This combination is called **dual antiplatelet therapy (DAPT)**. Its job is to prevent blood clots from forming inside your stent — a complication called **stent thrombosis**, which can cause a heart attack or be fatal[4][8]. --- ## How Long Must You Take DAPT? | Your Situation | Minimum Duration | |----------------|-----------------| | **Bare metal stent** | At least **4 weeks**[2] | | **Drug-eluting stent** | At least **12 months**[2] | | **After a heart attack (ACS)** | At least **12 months**; possibly longer if high-risk[3] | **Do not stop either medication early** unless your cardiologist tells you to. Stopping DAPT prematurely — especially within the first month — is the single strongest risk factor for stent thrombosis[8][10]. --- ## Key Precautions ### 1. Never Stop Both Medications at Once - If both antiplatelet drugs are stopped, stent thrombosis can occur in as little as **7 days** (median time)[4]. - If one drug is continued, the risk window extends to about **122 days**[4]. - **Always keep taking aspirin** unless your doctor specifically tells you to stop. ### 2. Before Surgery or Dental Procedures - **Inform every doctor, dentist, or surgeon** that you are on blood thinners. - **Do not stop DAPT on your own** before any procedure. - For planned surgeries: - If possible, delay elective surgery until after your DAPT course is complete (at least **1 month** after bare metal stent, **6–12 months** after drug-eluting stent)[5][6][11]. - If surgery cannot wait, your cardiologist will coordinate: you will likely **continue aspirin** and stop the second drug **3–7 days before surgery** (depending on which drug you take)[5]. - After surgery, restart the second drug **as soon as possible**[6]. ### 3. Watch for Bleeding — But Do Not Stop DAPT DAPT increases bleeding risk. Contact your doctor if you notice: - Unusual bruising or bleeding that does not stop - Black or bloody stools - Vomiting blood or coffee-ground-like material - Blood in urine **However, do not stop DAPT on your own** — the risk of stent thrombosis (heart attack) is higher than the risk of bleeding in most cases[4][10]. ### 4. Protect Your Stomach - DAPT increases the risk of stomach bleeding. - Your doctor may prescribe a **proton pump inhibitor (PPI)** (e.g., omeprazole, pantoprazole) to protect your stomach lining[7]. - Take it as directed. ### 5. Take Your Medications Exactly as Prescribed - Take both medications at the same time each day. - Use a **pill organizer** or set a daily alarm. - If you miss a dose: take it as soon as you remember, unless it is almost time for your next dose — then skip the missed dose. **Never double up.** --- ## When to Seek Emergency Care **Call 911 or go to the nearest emergency room immediately if you experience:** - Chest pain, pressure, or discomfort - Shortness of breath - Pain spreading to your arm, jaw, or back - Sudden weakness or numbness on one side of your body - Slurred speech These could be signs of stent thrombosis or a heart attack. --- ## Quick Summary | ✅ **DO** | ❌ **DON'T** | |-----------|-------------| | Take both medications daily as prescribed | Stop either medication without your cardiologist's approval | | Tell all healthcare providers you are on DAPT | Stop both drugs at the same time for any reason | | Contact your cardiologist before any planned surgery | Ignore signs of bleeding or chest pain | | Use a pill organizer to avoid missed doses | Double up on missed doses | --- **The following flowchart illustrates the recommended DAPT duration strategy after PCI based on your clinical presentation:**  *Figure: Clinical algorithm for determining DAPT duration after PCI based on stable ischemic heart disease (SIHD) vs. acute coronary syndrome (ACS) presentation and stent type* --- **The diagram below shows how doctors balance your bleeding risk and ischemic risk to choose the right DAPT strategy after a heart attack:**  *Figure: Clinical algorithm for antiplatelet therapy after ACS, balancing ischemic and bleeding risk to determine DAPT duration and intensity* --- *This information is based on current clinical guidelines and is for educational purposes. Always follow your cardiologist's specific instructions for your individual situation.*