Aspirin Administration After Thrombectomy

Introduction to Aspirin Therapy

Low-dose aspirin (81 mg) is as effective as higher doses (325 mg) with potentially fewer side effects, according to the American Diabetes Association 1, 2, 3

The American Heart Association recommends continuation of dual antiplatelet therapy if possible, as interruption increases risk of stent thrombosis, with a focus on patients with established cardiovascular disease 4
The ADAPTABLE trial found no significant differences in cardiovascular events or major bleeding between patients assigned to 81 mg versus 325 mg of aspirin daily, as guided by the American College of Cardiology 2
The recommended aspirin regimens are:

Aspirin Dose	Patient Population	Recommendation
81 mg	Patients with cardiovascular indications	Start aspirin at 81 mg daily
81 mg	Patients who received stenting during thrombectomy	Start aspirin at 81 mg daily, potentially combined with a P2Y12 inhibitor based on stent type

For patients with high bleeding risk, consider gastric protection with proton pump inhibitors when administering aspirin, as suggested by the European Society of Cardiology 4
In patients with diabetes, current evidence does not support empirically using higher doses of aspirin due to "aspirin resistance", according to the American Diabetes Association 3
Aspirin can be safely restarted immediately after surgery at the previous treatment dose if surgery can be performed within a 48-hour window, according to guidelines that prioritize minimizing cardiovascular risk 5
For non-urgent surgeries, consider reducing aspirin dose to 325 mg daily for 7 days prior to surgery, holding aspirin the day before and day of surgery, then restarting immediately postoperatively to balance surgical and cardiovascular risks 5

For ischemic conditions without thrombolysis, administer at least 160 mg aspirin immediately after diagnostic tests have excluded internal bleeding, following guidelines from management protocols 6
For ischemic conditions with thrombolysis, delay aspirin until after the 24-hour post-thrombolysis scan has excluded internal bleeding, to minimize the risk of hemorrhagic complications 6

Patients with established cardiovascular disease are at higher risk when aspirin is discontinued and should resume therapy as soon as safely possible, emphasizing the need for prompt management decisions 7
Patients with atrial fibrillation on anticoagulants require special consideration regarding aspirin resumption, and may need to prioritize anticoagulation therapy, according to guidelines from the American College of Cardiology 8
Avoid unnecessarily prolonged discontinuation of aspirin therapy, as this increases cardiovascular risk, and always assess for occult bleeding before resuming aspirin 7

Contraindications for aspirin administration include active or recent bleeding, known aspirin allergy, or current use of anticoagulants 9, 10, 11, 12
Aspirin should not be taken routinely after a medical emergency unless experiencing symptoms suggestive of a cardiac condition, as recommended by the American Heart Association 9, 10
The American Heart Association recommends 160-325 mg of non-enteric coated aspirin for suspected cardiac conditions, which should be chewed rather than swallowed whole for faster absorption (Class I, LOE B) 9, 10, 11

Early administration of aspirin (within the first hours of symptom onset) shows benefit in reducing cardiovascular mortality compared to later administration (Class I, LOE B) 13
Delaying aspirin administration when cardiac conditions are suspected can increase mortality, and early administration is critical for reducing mortality (Class I, LOE B) 13
Using enteric-coated aspirin in acute settings is not recommended due to slower absorption, making nonenteric aspirin the preferred formulation for immediate treatment (Class I, LOE B) 11
Emergency responders may instruct patients with suspected cardiac conditions to chew an aspirin (160-325 mg) while awaiting medical help arrival, provided they have no history of aspirin allergy or signs of bleeding (Class I, LOE B) 11, 9