Review
A review of traditional and novel oral anticoagulant and antiplatelet therapy for dermatologists and dermatologic surgeons

Presented at the American Society for Dermatologic Surgery Annual Meeting, Atlanta, GA, October 10-14, 2012.
https://doi.org/10.1016/j.jaad.2014.10.027Get rights and content

Background

Dermatologic surgeons will increasingly encounter patients on novel oral antiplatelet and anticoagulant medications.

Objectives

We conducted a complete overview of the pharmacokinetics, pharmacodynamics, and side effects of traditional and novel oral anticoagulant and antiplatelet therapies along with dietary supplements with anticoagulant or antiplatelet properties.

Methods

A PubMed search was completed for “aspirin,” “warfarin,” “clopidogrel,” “dabigatran,” “rivaroxaban,” “apixaban,” “prasugrel,” and “ticagrelor.” Review articles and publications emphasizing perioperative management of oral anticoagulant or antiplatelet medications were selected. An additional PubMed search was completed for “hemorrhage,” “bleeding,” and “thrombosis” in conjunction with “dermatology,” “dermatologic surgery,” and “cutaneous surgery.”

Results

Aspirin, clopidogrel, and warfarin have shortfalls in dosing, monitoring, and efficacy. Several trials show superior efficacy with dabigatran, rivaroxaban, and apixaban, with equal or reduced risk of bleeding compared with warfarin. Prasugrel and ticagrelor may be associated with an increased bleeding risk. Many over-the-counter medications also have anticoagulant properties with associated bleeding risks that cannot be overlooked.

Limitations

There are few publications evaluating the novel oral anticoagulants' effects on outpatient surgical procedures.

Conclusion

Novel anticoagulant and antiplatelet drugs are revolutionizing therapy for cardiovascular diseases. As these medications become more prevalent, dermatologists and dermatologic surgeons must be mindful of the bleeding risk that will apply in our everyday practices.

Section snippets

Warfarin

With more than 33 million prescriptions written each year, warfarin is the most ubiquitous anticoagulant prescribed. Warfarin's indications and mechanism of action are listed in Table I and Fig 1.9, 10, 11, 12, 13, 14, 15, 16 Numerous medications and supplements have potentially significant interactions with warfarin because of extensive protein binding and CYP2C9 metabolism (Table II).17

Bleeding is the major adverse event associated with warfarin, and risk of hemorrhage increases with the

Aspirin

Aspirin (acetylsalicylic acid) remains the cornerstone of antiplatelet therapy because of its proven benefit and low cost.41 In patients with known atherosclerotic disease, aspirin reduced serious vascular events (myocardial infarction, CVA, death) by 14% to 25%, and the benefit substantially outweighed the bleeding risk (Table I).42, 43, 44, 45

Activated platelets release thromboxane A2, which promotes platelet aggregation, vasoconstriction, and further platelet activation. Aspirin irreversibly

Dietary supplements

Use of complementary and alternative medicine products is steadily increasing. Up to 27% of surgical patients consume over-the-counter products that theoretically inhibit coagulation (Table IV).57, 58 Activity may be intrinsic to the compound or may be a result of synergistic effects in combination with standard anticoagulants. Importantly, formulations of these supplements can vary greatly because they are not subjected to FDA scrutiny like prescription medications. This variability hinders a

Anticoagulant and antiplatelet agents: Current recommendations in dermatologic surgery

The overall rate of perioperative or postoperative hemorrhage or hematoma formation in dermatologic surgery is extremely low (0.89% of cases).1 The consensus in recent literature favors perioperative continuation of medically necessary anticoagulant or antiplatelet medications in dermatologic surgery despite any perceived or real increased risk of hemorrhagic complications. Five recent studies have evaluated this bleeding complication risk. Warfarin confers a 7- to 9-fold increased risk of

References (76)

  • J.W.M. Cheng et al.

    Dabigatran etexilate: an oral direct thrombin inhibitor for the management of thromboembolic disorders

    Clin Ther

    (2012)
  • C. Becattini et al.

    Old and new anticoagulants for venous thromboembolism and atrial fibrillation: a review of the literature

    Thromb Res

    (2012)
  • H.C. Diener et al.

    Apixaban versus aspirin in patients with atrial fibrillation and previous stroke or transient ischemic attack: a predefined subgroup analysis from AVERROES, a randomized trial

    Lancet Neurol

    (2012)
  • S. Schulman et al.

    How I treat with anticoagulants in 2012: new and old anticoagulants, and when and how to switch

    Blood

    (2012)
  • J.S. Berger et al.

    Low-dose aspirin in patients with stable cardiovascular disease: a meta-analysis

    Am J Med

    (2008)
  • A. Bartolucci et al.

    Meta-analysis of multiple primary prevention trials of cardiovascular events using aspirin

    Am J Cardiol

    (2011)
  • C. Dib et al.

    A new era for antiplatelet therapy in patients with acute coronary syndrome

    Am J Med Sci

    (2010)
  • W.S. Harris et al.

    The combined effects of N-3 fatty acids and aspirin on hemostatic parameters in man

    Thromb Res

    (1990)
  • M.J. Haut et al.

    The effect of ethanol on hemostatic properties of human blood platelets

    Am J Med

    (1974)
  • L. Lacoste et al.

    Acute and delayed antithrombotic effects of alcohol in humans

    Am J Cardiol

    (2001)
  • O. Kovich et al.

    Thrombotic complications related to discontinuation of warfarin and aspirin therapy perioperatively for cutaneous operation

    J Am Acad Dermatol

    (2003)
  • T.L. Ortel

    Perioperative management of patients on chronic antithrombotic therapy

    Blood

    (2012)
  • K.G. Lewis et al.

    A meta-analysis of complications attributed to anticoagulation among patients following cutaneous surgery

    Dermatol Surg

    (2008)
  • E.M. Billingsley et al.

    Intraoperative and postoperative bleeding problems in patients taking warfarin, aspirin, and nonsteroidal antiinflammatory agents

    Dermatol Surg

    (1997)
  • C.G. Bunick et al.

    Hemorrhagic complications in dermatologic surgery

    Dermatol Ther

    (2011)
  • M.J. Stanger et al.

    Anticoagulant activity of select dietary supplements

    Nutr Rev

    (2012)
  • S.C. Collins et al.

    Dietary supplements in the setting of Mohs surgery

    Dermatol Surg

    (2002)
  • Coumadin [full prescribing information]. Bristol-Myers Squibb Pharma Co, Princeton, NJ; 2011. Available from:...
  • L. Borris

    Rivaroxaban and dabigatran etexilate: two new oral anticoagulants for extended postoperative prevention of venous thromboembolism after elective total hip arthroplasty

    Arch Orthop Trauma Surg

    (2010)
  • I.Y. Gong et al.

    Clinical and genetic determinants of warfarin pharmacokinetics and pharmacodynamics during treatment initiation

    PLoS One

    (2011)
  • E. Nutescu et al.

    Drug and dietary interactions of warfarin and novel oral anticoagulants: an update

    J Thromb Thrombolysis

    (2011)
  • D. Garcia et al.

    Prevention and treatment of bleeding complications in patients receiving vitamin K antagonists, part 1: prevention

    Am J Hematol

    (2009)
  • Pradaxa [full prescribing information]. Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, CT; 2014. Available from:...
  • S.J. Connolly et al.

    Dabigatran versus warfarin in patients with atrial fibrillation

    N Engl J Med

    (2009)
  • J. Oldgren et al.

    Risks for stroke, bleeding, and death in patients with atrial fibrillation receiving dabigatran or warfarin in relation to the CHADS2 score: a subgroup analysis of the RE-LY trial

    Ann Intern Med

    (2011)
  • J. Oldgren et al.

    Dabigatran vs placebo in patients with acute coronary syndromes on dual antiplatelet therapy: a randomized, double-blind, phase II trial

    Eur Heart J

    (2011)
  • J.P. Bota et al.

    Dabigatran etexilate: clinical implications in dermatologic surgery

    Dermatol Surg

    (2012)
  • W.E. Dager

    Developing a management plan for oral anticoagulant reversal

    Am J Health Syst Pharm

    (2013)
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    Funding sources: None.

    Conflicts of interest: None declared.

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