Przejdź do treściQuestions about anticoagulants and antiplatelet medicines are not a formality. The exact drug, dose and reason for taking it can affect how bruising or swelling after an injury is interpreted, how joint aspiration or an injection is planned, and how a possible operation is prepared. Stopping these medicines on your own can also increase the risk of thrombosis or stroke. The important point is therefore accurate information rather than simply saying that a medicine “thins the blood”.
One everyday phrase, several different medicines
Patients often use “blood thinners” for several different groups of medicines. Anticoagulants include vitamin K antagonists and direct oral anticoagulants, while antiplatelet medicines such as aspirin or clopidogrel work differently but also affect haemostasis. The dose, how regularly the medicine is taken, the time of the last dose, kidney function and the reason for treatment can all matter.
For that reason, “I take something for my blood” is not precise enough. It is best to give the name from the package or medication list, the dose and dosing schedule. It also helps to explain whether the medicine was prescribed because of atrial fibrillation, thrombosis, pulmonary embolism, arterial disease, a coronary stent or another indication, because the reason for treatment affects the risk of any interruption.
What changes after an injury?
After a bruise or sprain, a person taking medication that affects clotting may develop more extensive bruising or a larger haematoma. The appearance of bruising alone does not show whether there is a fracture, tendon injury or ligament injury. The mechanism of injury, focal tenderness, ability to bear weight, range of motion, strength, sensation and circulation still matter.
Rapidly increasing swelling, severe worsening pain, numbness, weakness, pallor or a cold limb need particular attention. A head injury in a person taking anticoagulants also warrants prompt medical assessment even when the initial symptoms seem minor. Antithrombotic treatment may help explain greater bleeding, but it should not distract from assessing the injury itself.
Joint aspiration or injection does not automatically mean stopping treatment
Bleeding risk depends on the procedure and the individual situation. EULAR recommendations state that intra-articular therapy is not automatically contraindicated in people taking antithrombotic medication unless the individual bleeding risk is high. This does not create one rule for every patient, every medicine or every procedure.
Before a planned aspiration or injection, the clinician should know the exact medicine, dose, indication and other factors that may increase bleeding risk. Some procedures can be performed without changing treatment, while others require an agreed plan. The decision should not be based on independently skipping a tablet on the day of the appointment. More about the procedure: Joint Aspiration — Why Is Synovial Fluid Collected?
Why is there no single rule before surgery?
Planning has to balance the bleeding risk of the actual procedure against the thrombotic risk of interrupting treatment. Relevant factors include the type of medicine, kidney function, the indication for treatment, a recent thrombosis or stroke, the presence of a stent and the extent of the planned operation. The CHEST guideline emphasises an individual, patient-centred assessment of these competing risks.
There is therefore no safe universal interval for stopping all “blood-thinning medicines”. Any specific instruction should come from the treating team and take account of both the actual procedure and the condition for which the medicine was prescribed. This article is not a perioperative medication protocol and does not replace individual instructions.
What should you bring to the appointment?
- the name and dose of every relevant medicine;
- the time of the last dose if a procedure is planned;
- the reason for taking the medicine and the clinician or clinic managing it;
- information about previous thrombosis, pulmonary embolism, stroke, stents or significant bleeding;
- any current test results that were specifically requested, without arranging extra tests on your own.
The practical message is simple: do not hide treatment and do not stop it on your own. An accurate medication list makes it easier to assess an injury, plan an examination or procedure and, if treatment needs to be changed, coordinate that decision with the clinician responsible for the antithrombotic therapy.
References
- Uson J, Rodriguez-García SC, Castellanos-Moreira R, et al. EULAR recommendations for intra-articular therapies. Annals of the Rheumatic Diseases. 2021;80:1299–1305.
- Douketis JD, Spyropoulos AC, Murad MH, et al. Perioperative Management of Antithrombotic Therapy: An American College of Chest Physicians Clinical Practice Guideline. Chest. 2022;162(5):e207–e243. A corrigendum was published in Chest. 2023;164(1):267.
Content prepared by: Tomasz Poboży - orthopaedic surgeon.