Daily Aspirin: Cardiologist Explains Who Should and Shouldn't Take It

How Aspirin Works

• 💡 Aspirin works by making platelets less sticky, which reduces the risk of blood clots forming in arteries.
• 🧠 It achieves this by irreversibly inhibiting an enzyme called cycloozygenase on platelets, leading to less thromboxane A2.
• ⏳ Since platelets have a lifespan of about 10 days, daily aspirin intake is necessary to continuously inhibit new platelets.
• ⚠️ A key trade-off is an increased risk of bleeding, as platelets also play a role in stopping bleeding.

Secondary Prevention: When Aspirin is Recommended

• ✅ Aspirin is strongly recommended for individuals with established heart disease, such as those who have had bypass surgery, angioplasty, or a heart attack.
• 🎯 In these cases, the benefit of preventing further cardiac events outweighs the risk of bleeding.
• 💊 For patients with conditions like atrial fibrillation requiring more powerful blood thinners, the combination therapy duration is carefully managed due to increased bleeding risks.

Primary Prevention: The Debate on Daily Aspirin

• 🤔 For individuals with no prior cardiac events, the decision to take daily aspirin is more complex, with recent research shifting perspectives.
• 📊 Large studies show that in people with no history of heart issues, taking aspirin daily prevents about four heart attacks per thousand people annually.
• 🩸 However, the same studies indicate it causes about five major bleeds per thousand people annually, including stomach bleeds and a one-in-a-thousand risk of brain bleeds.
• ⚠️ A brain bleed carries a significantly higher mortality risk (around 50% chance of death) compared to a heart attack that doesn't kill the patient.

Personalizing Aspirin Decisions

• ⚖️ The decision for primary prevention is increasingly based on patient values and preferences, acknowledging that not everyone will weigh the risks and benefits the same way.
• 🗣️ If a patient is highly concerned about heart attacks and willing to accept the risk of bleeding, they might choose to take aspirin.
• 📉 Risk calculators like the Framingham risk calculator can help assess a 10-year risk of heart attack, stroke, or death based on factors like age, blood pressure, smoking status, family history, and cholesterol.

Aspirin Dosage and Surgical Considerations

• 💊 The common doses of baby aspirin (75mg, 81mg, or 100mg) are generally effective in inhibiting platelets and vary by country and regulatory approval.
• 🚫 Taking aspirin every other day is not recommended for bleeding risk reduction, as new platelets are produced daily.
• ⚠️ Patients on daily aspirin should consult with their pre-operative team, as they may need to stop aspirin a certain period before surgery to minimize bleeding complications.