Navigating NSAID Use in Patients Receiving Oral Anticoagulation: Is There a Safe Course?
04 May 2020
04 May 2020
06 July 2020 (online)
Oral anticoagulation (OAC) is used for thromboprophylaxis, but the downside is the risk of bleeding; hence, clinical decision-making often has to balance the reduction in thromboembolism against the potential for serious bleeding. Indeed, many clinical risk factors have been described as contributing to bleeding risk among OAC users. The risks of antithrombotic therapy-related bleeding are multifactorial, and even ethnicity may play a part.
The use of aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs) in combination with OAC poses a risk of bleeding.      NSAIDs are also associated with thrombosis.       From a clinical perspective, the chronic use of NSAIDs with OAC tends to intersect in patients with chronic osteoarthritis (OA) and atrial fibrillation (AF). The NSAID class has therapeutic benefit for treating arthritic pain and inflammation, and providing patients with important symptomatic relief and physical mobility. However, patients can develop serious major bleeding, in particular gastrointestinal (GI) major bleeding, when NSAIDs are combined with OAC.
Antiplatelet therapy (APT) or NSAID use in combination with warfarin are associated with an increased risk of major bleeding and GI major bleeding.  The factor Xa inhibitors (apixaban, rivaroxaban) and direct thrombin inhibitor (dabigatran) have a safer overall intracranial bleeding profile relative to therapeutically dosed warfarin (international normalized ratio 2.0–3.0).   Apixaban has been shown to have less major bleeding and GI major bleeding relative to warfarin. Dabigatran and rivaroxaban are associated with increased GI major bleeding, and relatively similar rates of major bleeding, relative to warfarin.  NSAID use in combination with apixaban is associated with an increased risk of major bleeding, but not GI major bleeding. NSAID use in combination with dabigatran is associated with an increased risk of major bleeding and GI major bleeding. Rivaroxaban with NSAIDs has shown a similar trend. The general trends for major bleeding and GI major bleeding in combined NSAID and OAC use are summarized in [Table 1]. In general, the use of NSAIDs in combination with the most commonly used OACs (apixaban, rivaroxaban, dabigatran, or warfarin) is limited by the risk of major bleeding.
Abbreviations: COX-2, cyclooxygenase enzyme 2; GI, gastrointestinal; NSAID, nonsteroidal anti-inflammatory drug; OAC, oral anticoagulation.
Note: ⇑, significant increase. ⇔, no significant difference.
The clinical question remains: is there a safe course for using NSAIDs in combination with OAC? Patients with AF on OAC and comorbid severe OA are limited in terms of pharmacologic OA relief, which can impair physical mobility and quality of life. Celecoxib, a selective COX-2 inhibitor NSAID, is effective for the symptomatic treatment of OA and improving physical function,   and can be dosed once daily compared with multiple dosing for nonselective NSAIDs. Celecoxib is understudied in regards to safety when used with OAC ([Table 1]).
In this issue of Thrombosis and Haemostasis, a meta-analysis by Zapata et al suggests that selective COX-2 inhibitors do not have an elevated risk of major bleeding, but do for GI major bleeding, when used in combination with warfarin, whereas nonselective NSAIDs were associated with an increased risk of both major bleeding and GI major bleeding. This analysis is consistent with a previous study regarding NSAID use with warfarin. In a previous large cohort analysis of NSAID use with warfarin, celecoxib was the only NSAID agent that did not demonstrate a significant increase in major bleeding when combined with OAC; however, selective COX-2 inhibitors as a class were associated with a significant increase in major bleeding and GI major bleeding. It is important to caution that nonselective NSAIDs and selective COX-2 inhibitors alone are associated with an increased bleeding and thrombotic risk compared with no NSAID use.  Celecoxib was shown to have similar rates of major adverse cardiovascular events and GI bleeding risk compared with ibuprofen and naproxen in patients with OA.    Additional analysis of the selective COX-2 inhibitor celecoxib is needed to better understand its safety when used in combination with OAC.
Careful medication review is necessary to identify other bleeding risk agents, such as APT (e.g., aspirin, clopidogrel, ticagrelor), as well as multiple NSAID use, to avoid “stacking” bleeding risk. Review of the past medical history to gauge bleeding risk also helps to identify contraindications to NSAID use with OAC. Past medical history of major bleeding, GI mucosal disease, cirrhosis, or renal failure are major precautions to NSAID use all together. A proactive management strategy with appropriate use of dynamic bleeding risk assessment, mitigation of modifiable bleeding risk factors, and follow-up of high-risk patients was associated with lowered bleeding events and improved anticoagulation uptake among patients with AF, when compared with usual care.
If patients with comorbid AF and OA, receiving OAC, are relatively otherwise healthy without bleed risk “stacking,” then close clinical follow-up and patient counseling may warrant safe NSAID use on a pro re nata basis. A clinical approach to NSAIDs and OAC is proposed in [Table 2]. Adjunctive analgesic therapies for OA include weight loss, physical therapy, acetaminophen, transdermal lidocaine, transdermal NSAIDs, and tramadol. Opioids are generally not recommended. Consultation with orthopaedics surgery for definitive arthroplasty is warranted in severe cases of OA. Duloxetine is recommended as a safe adjunctive therapy for chronic lumbar back pain. In summary, a comprehensive multimodal strategy for treating OA pain in patients with AF on OAC is recommended. Review with cardiology, rheumatology, hematology, or nephrology are also important considerations on a case-by-case basis before initiating an NSAID in patients receiving OAC.
Abbreviations: AF, atrial fibrillation; AVM, arteriovenous malformation; CABG, coronary artery bypass graft; CHF, congestive heart failure; CKD, chronic kidney disease; CNS, central nervous system; DVT/PE, deep vein thrombosis/pulmonary embolism; ESRD, end-stage renal disease; HD, hemodialysis; ICH, intracranial hemorrhage; MI, myocardial infarction; NSAID, nonsteroidal anti-inflammatory drug; OAC, oral anticoagulation; OCPs, oral contraceptives; PAD, peripheral arterial disease; PCI, percutaneous coronary intervention; PRN, pro re nata; TIA, transient ischemic attack.
Importantly, NSAIDs are also used on a short-term basis for their antipyretic effects. It is important to opt for acetaminophen in place of NSAIDs for patients with a febrile illness who are on OAC. NSAID-related renal dysfunction is also an important consideration, especially in regards to the pharmacokinetics of OACs that depend on the creatinine clearance (renal elimination: apixaban 27%, rivaroxaban 66%, dabigatran 80%).
Further clinical investigation into the relationship between NSAID and OAC use, specifically the selective COX-2 inhibitor celecoxib at low dose, may help define a relatively safe strategy for their combined use in select situations to address the therapeutic goals of patients with comorbid OA and AF, among other related chronic conditions in which NSAIDs and OAC intersect.
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