History Warfarin Timeline

Total Page:16

File Type:pdf, Size:1020Kb

History Warfarin Timeline 1998 Barr Laboratories sue 2008: The American 2010: Dabigatran DuPont Merck for publicly approved as an 2012: CHAD (Congestive In 1982 the World College of Medical Endo Products attacking their generic warfarin alternative to warfarin heart failure, Hypertension, Carl Link Health Organisation Genetics & Genomics Inc. introduce and initiating a national 2003-4 the UK Committee 2006 systematic review and meta- for use in Stroke Age, Diabetes, prior and his team 1960 The first (WHO) adopts the (ACMG) and the guidelines coumadin onto campaign to curb access to on Safety of Medicines analysis of 14 randomized trials Prevention in Atrial Stroke) score BNF released as an smart synthesize dicoumarol in randomised INR and the system Heike Moeller, from the American College the market. generics, in order to protect receives several reports of showed home testing led to a Fibrillation (SPAF) recommended by the phone app, marking the their trial of standardises a German student of Chest Physicians Endo was Coumadin's market share from increased INR and risk of reduced incidence of complications European Society of truly laboratory anticoagulants antic (ACCP) do not recommend later aquired by oagulant demonstrates that she is competition. (thrombosis and major bleeding) Cardiology digital nature of Human use re- haemorrhage in people home/self testing heparin and control worldwide able to test and monitor and improved time within medicine prescription Frank Schofield, considered du Pont Late 1950s: hirudin, taking warfarin and drinking 2010: US Food and Drug nicoumalone her own INR during a therapeutic range a veterinary scientist living in when a US army recruit a specific thrombin cranberry juice Dabigatran and Administration (FDA) 2012: over 10.1 million Dicoumarol is made Wiegman & Vossepoel doctor-patient seminar. Ontario made the link attempts suicide inhibitor, isolated BMS buys rivaroxaban first approved mandates inclusion of prescriptions of warfarin available to develop a computer This leads to the between the dying cattle and with a high dose of from leech saliva; DuPont Pharma, 2006: ximelagatran (a as alternatives to Low dose recommendations written in England alone, Now more than treat thrombosis and program for long term development of a self- This delays Barr's generic the rotting sweet clovers warfarin and is served as a (including rival anticoagulant) Molecular Weight Heparin based on genotype in the with approximately 1% of 165,000 mobile myocardial infarction anticoagulation control testing machine formulation of Coumadin (Melilotus alba and Melilotus successfully saved with prototype for the warfarin) for $7.8 withdrawn from the for short-term Venous warfarin prescribing the UK population being health apps on the until 1999 when they produce officinalis) in their feed. It vitamin K design of thrombin billion in 2001 market owing to Thromboembolism (VTE) information leaflet prescribed this drug at any market the first generic on the market became known as Sweet inhibitors potential liver toxicity prevention accompanying the drug given time Clover Disease 1960 2006 2012 1944 1951 1954 1959 1977 1982 1986 1998 2001 2003-4 2008 2010 2016 Warfarin 1922 1940 Warfarin materially informed drug 1929 1975- digital drug 1941 1948 1956 1950 - 1981 1978 1999 2002 1920s 1953 1980 1984 2005 2007 2009 The Patent held 1989 - 1995: Six 1989 2011 2014 2017 by The University clinical trials show that 1998 Thrombosis of Wisconsin warfarin, now a prevention trial: Carl Link, while recovering Ann Daly & Farhad Lee Roderick and his team expires. They generic, is effective at randomised trial of from a lung infection in a rat Joseph Stalin Kamali's team at 2005 Association of 2011: Apixaban 2 machines for mobile During the 1920s cattle at the Agricultural Experimental It is not until 1978 that are estimated to preventing strokes in low-intensity oral 2009 A large infested sanitorium has the the Soviet Wilson & James Newcastle University are gene VKORC1 (encodes approved as an 31 million prescripti genetic testing for Poster designed in the US and Canada Station of North Dakota make the link the exact mechanism have benefited people with atrial anticoagulation with National Institutes idea of using warfarin as a dictator is describe an the first to demonstrate a the target of warfarin) with alternative to LMWH ons warfarin sensitivity and researched by started dying between coumarin and a lack of warfarin's action on from at least $120 fibrillation. warfarin and low- of Health (NIH) rodenticide. First registered allegedly automated statistically significant warfarin dose. for short-term VTE are written for released in 2017 one Jane Dickson. mysteriously. of prothrombin vitamin K metabolism is million from This prompts even dose aspirin in the Random Control for this use in the US in poisoned with computer association between This polymorphism prevention warfarin in the from the University of Farmers knew it was - a clotting factor in the blood - so shown for the first time. royalties on sales more widespread use primary prevention Test (RCT) initiated Wisconsin Alumni 1948 warfarin by one 1976 – 1981 differences system for CYP2C9 genotype and explains 30% of the dose United States in Liverpool and one With thanks to the due to mouldy hay, isolating the cause of the internal Warfarin inhibits the of warfarin of warfarn of ischaemic heart Research Foundation of his inner circle Research over a 30 between UK & US enzyme epoxide calculating and sensitivity to warfarin. The variation between patients 2014 from the University of D3 team: but could do nothing bleeding in cattle disease in men at 2002 Research (WARF) in 1953 year period thromboplastin lead to reductase which recording study also confirms that Newcastle Tony Cornford, about it increased risk. shows an The International Warfarin is given the patent rights shows that extensive research into interferes with vitamin warfarin dose in patients needing a low The Food and Drug Ela Klecun, for dicoumarol. bleeding risks. association of Administration Pharmacogenetics Consortium warfarin is effective K metabolism clinics 1989 initial dose of warfarin are A 2005 report concludes Will Venters, In the same year, US President Dwight Randomized trials result crystal structure gene CYP2C9 (FDA) in the US introduce the international in secondary significantly more likely to that self-testing and patient 33.9 million prescriptions Valentina Lichtner dicoumarol is Eisenhower suffers a in the development of of thrombin (which encodes a updates warfarin standard algorithm for gene- prevention – have suffered serious self-management are as of warfarin are dispensed The Delivering Digital Drugs & shown to work as an heart attack and is a target range for blood reported liver enzyme that labelling, adds PGx guided dosing of warfarin. This lowering the death bleeding events whilst effective methods of at retail pharmacies in the (D3) Project Ralph Hibberd anticoagulant prescribed clotting called the breaks down information to approach has been adopted by rate of people who taking the drug. monitoring oral US in 2011 (data from the runs from 2014 - 2017 for humans. Coumadin, thus International Normalised warfarin) with major warfarin label and large US medical centres and have had a heart anticoagulation therapy as NHS Information Centre Shows how drugs such as warfarin have popularising rat Ratio (INR) bleeds. approves first test kit the FDA states that it will attack clinic monitoring and IMS Health) become digital drugs poison as a prevent 17,000 strokes a year in human medication the US .
Recommended publications
  • Occurrence, Elimination, and Risk of Anticoagulant Rodenticides in Wastewater and Sludge
    Occurrence, elimination, and risk of anticoagulant rodenticides in wastewater and sludge Silvia Lacorte, Cristian Gómez- Canela Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona Rats and super-rats Neverending story 1967 Coumachlor 1 tn rodenticides /city per campaign “It will be the LAST ONE” Rodenticides Biocides: use regulated according to EU. Used mainly as bait formulations. First generation: multiple feedings, less persistent in tissues, commensal and outdoor use. Second generation: single feeding (more toxic), more persistent in tissue, commensal use only. Toxic: vitamin K antagonists that cause mortality by blocking an animal’s ability to produce several key blood clotting factors. High oral, dermal and inhalation toxicity. Origin and fate of rodenticides Study site: Catalonia (7.5 M inhabitants) 1693 km of sewage corridor 13 fluvial tanks (70.000 m3) 130,000,000 € / 8 YEARS 32,000 km2 378,742 kg/y AI 2,077,000 € Objectives 1. To develop an analytical method to determine most widely used rodenticides in wastewater and sludge. 2. To monitor the presence of rodenticides within 9 WWTP receiving urban and agricultural waters. 3. To evaluate the risk of rodenticides using Daphnia magna as aquatic toxicological model. 4. To study the accumulation of rodenticides in sludge. Compounds studied Coumachlor* Pindone C19H15ClO4 C14H14O3 Dicoumarol Warfarin C19H12O6 C19H16O4 Coumatetralyl Ferulenol FGARs C19H16O3 C24H30O3 Acenocoumarol Chlorophacinone • Solubility C19H15NO6 C23H15ClO3 0.001-128 mg/L • pKa 3.4-6.6 Flocoumafen Bromadiolone C H F O C H BrO 33 25 3 40 30 23 4 • Log P 1.92-8.5 Brodifacoum Fluindione C H BrO 31 23 3 C15H9FO2 SGARs Difenacoum Fenindione C31H24O3 C15H10O2 1.
    [Show full text]
  • New Zealand Data Sheet 1
    New Zealand Data Sheet 1. PRODUCT NAME NAXEN® 250 mg tablets 2. QUALITATIVE AND QUANTITATIVE COMPOSITION Each NAXEN 250 mg tablet contains 250 mg of Naproxen For the full list of excipients, see section 6.1. 3. PHARMACEUTICAL FORM NAXEN 250 mg tablets are yellow, biconvex, round tablet of 11 mm diameter with one face engraved NX250 and having a bisecting score. The score line is only to facilitate breaking for ease of swallowing and not to divide into equal doses. 4. CLINICAL PARTICULARS 4.1. Therapeutic indications NAXEN is indicated in adults for the relief of symptoms associated with rheumatoid arthritis, osteoarthritis, ankylosing spondylitis, tendonitis and bursitis, acute gout and primary dysmenorrhoea. NAXEN is indicated in children for juvenile arthritis. 4.2. Dose and method of administration After assessing the risk/benefit ratio in each individual patient, the lowest effective dose for the shortest possible duration should be used (see Section 4.4). During long-term administration the dose of naproxen may be adjusted up or down depending on the clinical response of the patient. A lower daily dose may suffice for long-term administration. In patients who tolerate lower doses well, the dose may be increased to 1000 mg per day when a higher level of anti-inflammatory/analgesic 1 | P a g e activity is required. When treating patients with naproxen 1000 mg/day, the physician should observe sufficient increased clinical benefit to offset the potential increased risk. Dose Adults For rheumatoid arthritis, osteoarthritis and ankylosing spondylitis Initial therapy: The usual dose is 500-1000 mg per day taken in two doses at 12 hour intervals.
    [Show full text]
  • Perioperative Management of Patients Treated with Antithrombotics in Oral Surgery
    SFCO/Perioperative management of patients treated with antithrombotic agents in oral surgery/Rationale/July 2015 SOCIÉTÉ FRANÇAISE DE CHIRURGIE ORALE [FRENCH SOCIETY OF ORAL SURGERY] IN COLLABORATION WITH THE SOCIÉTÉ FRANÇAISE DE CARDIOLOGIE [FRENCH SOCIETY OF CARDIOLOGY] AND THE PERIOPERATIVE HEMOSTASIS INTEREST GROUP Space Perioperative management of patients treated with antithrombotics in oral surgery. RATIONALE July 2015 P a g e 1 | 107 SFCO/Perioperative management of patients treated with antithrombotic agents in oral surgery/Rationale/July 2015 Abbreviations ACS Acute coronary syndrome(s) ADP Adenosine diphosphate Afib Atrial Fibrillation AHT Arterial hypertension Anaes Agence nationale d’accréditation et d’évaluation en santé [National Agency for Accreditation and Health Care Evaluation] APA Antiplatelet agent(s) aPTT Activated partial thromboplastin time ASA Aspirin BDMP Blood derived medicinal products BMI Body mass index BT Bleeding Time cAMP Cyclic adenosine monophosphate COX-1 Cyclooxygenase 1 CVA Cerebral vascular accident DIC Disseminated intravascular coagulation DOA Direct oral anticoagulant(s) DVT Deep vein thrombosis GEHT Study Group on Hemostasis and Thrombosis (groupe d’étude sur l’hémostase et la thrombose) GIHP Hemostasis and Thrombosis Interest Group (groupe d’intérêt sur l’hémostase et la thrombose) HAS Haute autorité de santé [French Authority for Health] HIT Heparin-induced thrombocytopenia IANB Inferior alveolar nerve block INR International normalized ratio IV Intravenous LMWH Low-molecular-weight heparin(s)
    [Show full text]
  • Drug Interactions and Lethal Drug Combinations
    J Clin Pathol: first published as 10.1136/jcp.28.Suppl_9.94 on 1 January 1975. Downloaded from J. clin. Path., 28, Suppl. (Roy. Coll. Path.), 9, 94-98 The drug dilemma-benefits and hazards Drug interactions and lethal drug combinations ALAN RICHENS From the Department of Clinical Pharmacology, St Bartholomew's Hospital, London Although the development of drugs of greater example, aspirin can displace oral anticoagulants potency and efficacy confers on the physician from their plasma-protein-binding sites, and in- increasing power to treat serious diseases, it also directly acting sympathomimetics contained in cough increases the number and seriousness of potential mixtures can cause a hypertensive crisis in patients adverse effects and drug interactions which can on monoamine oxidase inhibitors. Self-medication is occur. Most hospital patients receive more than one common, and often involves drugs obtained on drug at a time, the average number often being prescription for a previous illness. greater than five (Smith, Seidl, and Cluff, 1966). The 4 When several clinics or doctors are involved in incidence of drug reactions rises with the number of the care of a patient, one doctor may not be aware of drugs prescribed simultaneously. In patients pre- what another has prescribed. scribed one to five drugs the incidence of reactions is 5 When preparations which contain more than 18-6%, while in patients prescribed six or more one ingredient are prescribed by their trade names. it rises to 814 % (Hurwitz and Wade, 1969). There are a number of ways in which drugs may The Boston Collaborative Drug Surveillance interact.
    [Show full text]
  • Dicoumarol: a Unique Microtubule Stabilizing Natural Product That Is Synergistic with Taxol1
    [CANCER RESEARCH 63, 1214–1220, March 15, 2003] Dicoumarol: A Unique Microtubule Stabilizing Natural Product that Is Synergistic with Taxol1 Hamta Madari, Dulal Panda, Leslie Wilson, and Robert S. Jacobs2 Departments of Ecology, Evolution, and Marine Biology [H. M., R. S. J.] and Molecular, Cellular, and Developmental Biology [L. W.], University of California, Santa Barbara, California 93106, and Bhupat and Jyoti Mehta School of Biosciences and Bioengineering, Indian Institute of Technology, Bombay, Mumbai, India 400076 [D. P.] ABSTRACT prostate cancer, malignant melanoma, and metastatic renal cell carci- noma (12–14). In studies on the antiproliferative actions of coumarin compounds, we In addition, the coumarin anticoagulants, dicoumarol (Dicumarol) -discovered that dicoumarol (a coumarin anticoagulant; 3,3؅-methyl and its synthetic derivative warfarin sodium (Coumadin), have been enebis[4-hydroxycoumarin]) inhibits the first cleavage of Strongylocentro- tus purpuratus (sea urchin) embryos in a concentration-dependent manner shown to decrease metastases in experimental animals (15). Warfarin with 50% inhibition occurring at a concentration of 10 ␮M. Because first sodium, largely replacing dicoumarol therapeutically as an anticoag- cleavage in sea urchin embryos is highly selective for microtubule- ulant, has been used for the treatment of a variety of cancers and targeted agents, we thought that the active compounds might inhibit cell shown to improve tumor response rates and survival in patients with division by interacting with tubulin or microtubules. We found that several types of cancer (16–22). However, despite numerous studies, ␮ dicoumarol binds to bovine brain tubulin with a Kd of 22 M and that 0.1 little information has been acquired on the cellular mechanism of ␮ M dicoumarol strongly stabilizes the growing and shortening dynamics action of coumarin compounds in the treatment of malignancies.
    [Show full text]
  • Some Aspects of the Pharmacology of Oral Anticoagulants
    Some aspects of the pharmacology of oral anticoagulants The pharmacology of oral anticoagulants ls discussed with particular rejerence to data of value in the management of therapy. The importance of individual variability in response and drug interaction is stressed. Other effects of these agents which may have clinical utility are noted. William W. Coon, M.D., and Park W. Willis 111, M.D., Ann Arbor, Mich. The Departments of Surgery (Section of General Surgery) and Medicine, University of Michigan Medical School In the twenty-five years sinee the isola­ dividual struetural features but by a com­ tion of the hemorrhagie faetor in spoiled bination of several: molecular shape, in­ sweet clever," the gradually inereasing creased aetivity with 6 membered hetero­ utilization of oral antieoagulants for the eyclic rings with a substituent in position prevention and therapy of thromboembolie 8 and with a methoxyl rather than a free disease has made them one of the most hydroxl group. Also important is the dernon­ widely used groups of pharmacologic stration that levorotatory warfarin is seven agents. This review is restrieted to as­ times more aetive than its enantiomer.F" peets of the pharmaeology of these agents As Hunter and Shepherd'" have pointed whieh may be important to their proper out, the failure to obtain a precise cor­ clinieal utilization. relation between strueture and antieoagu­ lant aetivity is "not surprising in view of Relation of structure to function the influence of small struetural changes The oral antieoagulants have been di­ on sueh variables as solubility, rate of ab­ vided into four main groups on the basis sorption, ease of distribution, degree of of ehemieal strueture (Fig.
    [Show full text]
  • Perioperative Management of Patients Receiving OAC Or Anti-Platelet
    Perioperative Management of Patients Receiving Oral Anticoagulants or Antiplatelet Agents Brett C Stoll, MD, FACC February 28, 2015 Disclosures • None related to this presentation Case #1 • 78 yo man with proximal LAD stent (DES) 2 weeks ago, presents with displaced hip fracture. Peri-procedural management? – Hold both aspirin and Plavix for 7-10 days, resume post- procedure – Hold Plavix only for 7-10 days, then resume post- procedure – Inpatient Integrilin bridge Case #2 • 53yo man with history of an MI and a stent 2 years ago is scheduled for routine screening colonoscopy. Peri-procedural management? – Hold both aspirin and Plavix for 7-10 days, resume post- procedure – Hold Plavix only for 7-10 days, then resume post- procedure – Inpatient Integrilin bridge Case #3 • 70 yo man with chronic a-fib and admitted for colonoscopy. Coumadin was held prior to the procedure. Post-procedure management? – IV UFH until INR > 2.0 – Outpatient LMWH bridge – Resume Coumadin without a bridge Case #4 • 48 yo woman with bi-leaflet aortic valve is to undergo elective inguinal hernia repair. Post- op management? – IV UFH until INR > 2.0 – Outpatient LMWH bridge – Resume Coumadin without a bridge Case #5 • 70 yo man with a mechanical mitral valve (ball in cage) with a-fib, prior CVA, and undergoes colectomy. Post-op management? – IV UFH until INR > 2.0 – Outpatient LMWH bridge – Resume Coumadin without a bridge Anti-platelet therapy • Anti-platelet agents – Cyclo-oxygenase inhibitor • Aspirin – Adenosine diphosphate receptor (ADP) inhibitors • Clopidogrel (Plavix) • Prasugrel (Effient) • Ticagrelor (Brilinta) Anti-platelet therapy • Anti-platelet agents – Other agents • Phosphodiesterase inhibitors (Cilostazol (Pletal)) • Adenosine reuptake inhibitors (Dipyridamole (Persantine)) • Protease-activated receptor-1 (PAR-1) antagonists (Vorapaxar (Zontivity)) • Glycoprotein IIB/IIIA inhibitors – Abciximab (Reopro) – Eptifibatide (Integrilin) – Tirofiban (Aggrastat) Aspirin • Aspirin is the most widely used drug in medicine.
    [Show full text]
  • Comparing Antithrombotic Strategies After Bioprosthetic
    Antithrombotic Strategies after bAVR Evidence-based Synthesis Program APPENDIX A. SEARCH STRATEGIES DATABASES/WEBSITES: Ovid Medline 1946 to June 19, 2017 PubMed (non-Medline materials) January 9, 2017 Elsevier EMBASE February 1, 2017 EBM Reviews (CDSR, DARE, HTA, Cochrane CENTRAL, etc.) January 24, 2017 Clinicaltrials.gov January 24, 2017 RoPR (Registry of Patient Registries January 24, 2017 SEARCH STRATEGIES Updated search strategy – 9Jan2017, after adding “placement” based on Stevenson editorial: Epub Ahead of Print, In-Process & Other Non-Indexed Citations, Ovid MEDLINE(R) Daily and Ovid MEDLINE(R) 1946 to Present Date Searched: January 9, 2017 Searched by: Robin Paynter, MLIS 1 Heart Valve Prosthesis/ or Heart Valve Prosthesis Implantation/ or Transcatheter Aortic Valve Replacement/ or 80730 (((aort* or valve*) adj3 (implant* or replac* or graft*)) or AVR or AVRs or mini-AVR* or "surgical AVR*" or SAVR or SAVRs or "bioprosthe* AVR*" or "bio-prosthe* AVR*" or "biologic* AVR*" or bAVR* or TAVI* or TAVR* or PAVR* or ((transcatheter* or trans-catheter* or transfemoral* or trans-femoral* or transapical* or trans-apical* or transaxillar* or trans-axillar* or transvascular* or trans-vascular* or percutaneous* or bioprosthet* or bio-prosthet* or biologic*) adj3 (implant* or placement* or replac* or graft*))).tw,kf. 2 aortic valve/ or (aort* or answer or "Anticoagulation Treatment Influence on Postoperative Patients" or 998641 action).tw,kf. 3 bioprosthesis/ or (bioprosthe* or bio-prosthe* or ((biologic* or tissue* or prosthe*) adj3 (aort* or valv* or graft*)) or 512785 bovine* or porcine* or equine* or xenograft* or xenogen* or heterograft* or xenobioprosthe* or 3F* or ACURATE- TA* or Biocor* or Carpentier-Edwards* or COLIBRI* or CoreValve* or Crown PRT* or DOKIMOS* or Engager* or EPIC* or Freestyle* or FS or HANCOCK* or INSPIRIS* or J-Valve* or JENAVALVE* or MITROFLOW* or MOSAIC* or MYVAL* or Perceval* or Perimount* or Sapien* or SOLO or TLPB* or TRIFECTA*).tw,kf.
    [Show full text]
  • Summary of Product Characteristics
    SUMMARY OF PRODUCT CHARACTERISTICS 4 1. NAME OF THE MEDICINAL PRODUCT Revasc 2. QUALITATIVE AND QUANTITATIVE COMPOSITION One vial of Revasc contains 15 mg desirudin (INN) corresponding to approximately 270 000 antithrombin units (ATU) or 18 000 ATU per mg of desirudin with reference to the WHO Second International Standard for α-thrombin. Desirudin is a recombinant DNA product derived from yeast cells. Desirudin is a single chain polypeptide consisting of 65 amino acid residues and 3 disulphide bridges. Vials of desirudin are supplied with solvent ampoules containing pyrogen-free Mannitol Ph. Eur. in Water for injections Ph. Eur. 3. PHARMACEUTICAL FORM Powder for injection to be reconstituted prior to subcutaneous injection with 0.5 ml mannitol solvent for solution (3%) which is supplied with the product. 4. CLINICAL PARTICULARS 4.1 THERAPEUTIC INDICATIONS Prevention of deep venous thrombosis in patients undergoing elective hip and knee replacement surgery. 4.2 POSOLOGY AND METHOD OF ADMINISTRATION Adult and elderly patients The recommended dose is 15 mg twice daily. The first injection should be initiated 5 to 15 minutes before surgery but after induction of regional block anaesthesia, if used. Treatment with desirudin is then continued twice daily post-operatively for 9 to a maximum of 12 days or until the patient is fully ambulant, whichever occurs first. Currently, there is no clinical experience to support the use of desirudin beyond 12 days. Administration is by subcutaneous injection, preferably at an abdominal site. Injections should be rotated between at least four different sites. Children There is no clinical experience with desirudin in children.
    [Show full text]
  • Evidence-Based Practice Center Systematic Review Protocol
    Evidence-based Practice Center Systematic Review Protocol Project Title: Comparative Effectiveness of Pharmacologic and Mechanical Prophylaxis of Venous Thromboembolism Among Special Populations Background Prevalence of Venous Thromboembolism Pulmonary embolism (PE) resulting from deep vein thrombosis (DVT), collectively known as venous thromboembolism (VTE), affects an estimated 900,000 Americans each year and results in significant morbidity and mortality.1,2 The average annual incidence of DVT in the United States ranges from 48 to 122 per 100,000.1,2 With the ageing U.S. population, the number of cases of VTE is likely to rise. Adverse Consequences of Venous Thromboembolism There are significant adverse consequences of DVT and PE.1 Two-thirds of all VTE cases are nonfatal and result in hundreds of thousands of hospitalizations, whereas approximately one-third of these cases are fatal and result in an estimated 300,000 deaths each year.1,2 The cost of hospitalization for another medical condition has been shown to increase with the diagnosis of DVT (approximately $10,000) or PE ($20,000).3 Thus VTE is an important patient safety issue that results in significant morbidity, mortality, and health care cost.4 Accordingly, the comparative effectiveness and safety of interventions for the prevention and treatment of VTE are among the national priorities for comparative effectiveness research.5 Pharmacologic Agents and Medical Devices Used for Thromboprophylaxis There are a number of antithrombotic drugs and antithrombotic mechanical devices that are approved by the U.S. Food and Drug Administration (FDA) for various indications. A small proportion of these are approved for primary prophylaxis of VTE, but others may be considered or used off label for this purpose (Table 1).
    [Show full text]
  • Warfarin: from Rat Poison to Clinical
    MILESTONES Alumni Research Foundation (WARF), who were awarded the patent for dicoumarol in 1941. In 1945, Link considered using a coumarin derivative as a rodenticide. Dicoumarol acted too slowly to be a practical poison. Link and colleagues worked through a list of 150 varia- imageBROKER / Alamy Stock Photo Stock Alamy / imageBROKER tions of coumarin, and number 42 was found to be particularly potent. The compound was named ‘warfarin’ after the funding agency, and was successfully marketed in 1948 as a rodenticide. In 1951, a US Army inductee attempted suicide with multiple doses of warfarin in rodenticide, but fully recovered after being treated with vitamin K in hospital. Studies then began on the use of warfarin as a therapeutic anticoagulant. Clinical anticoagulants were available at this time, but heparin required parenteral MILESTONE 2 administration, and dicoumarol had a long lag period before onset of a therapeutic effect. The main Warfarin: from rat poison advantages of warfarin were high oral bioavailability and high water solubility; it was more potent than to clinical use dicoumarol, but its effect could still be reversed by vitamin K. Therefore, The anticoagulant drug warfarin fresh blood into the bleeding animal. warfarin transitioned into clinical is widely used to prevent and treat Roderick referred to the acquired use under the trade name Coumadin, deep-vein thrombosis and pul- coagulation disorder as a ‘plasma Warfarin and was approved for use in humans monary embolism, and to prevent prothrombin defect’. transitioned in 1954. stroke in patients who have atrial Despite recommendations not to into clinical An early recipient of warfarin was fibrillation, valvular heart disease, or feed mouldy hay to their cattle, many US president Dwight D.
    [Show full text]
  • The 50-Year Quest to Replace Warfarin Jeffrey Weitz
    The 50-year quest to replace warfarin Jeffrey Weitz Anticoagulants are used for the prevention and treatment of venous and arterial to check that the appropriate level of anticoagulation is reached and maintained in thrombosis, the leading cause of morbidity and mortality in the Western world. patients receiving warfarin. Consequently, warfarin is underused, and the level of Warfarin — the prototype oral anticoagulant — is a vitamin K antagonist that has been anticoagulation is often suboptimal even when it is administered. These drawbacks in clinical use since the 1950s. Although they are effective, vitamin K antagonists have highlight the need for new oral anticoagulants. The first drug to be approved — in 2010 DRUG several drawbacks, the most notable of which is the propensity to cause bleeding. — as an alternative to warfarin was dabigatran, a direct thrombin inhibitor. Clinical Other limitations include a slow onset of action, interactions with multiple other drugs studies of the direct factor Xa inhibitors rivaroxaban and apixaban have been DISCOVERY and interpatient variability in drug response. As a result, regular monitoring is required completed and could form the basis for regulatory approval as alternatives to warfarin. Comparative pharmacology of new oral anticoagulants compared to warfarin Venous and arterial thrombosis 'PFQVJGNKWO 8GUUGNYCNN Thrombotic disorders The coagulation cascade Warfarin Dabigatran Rivaroxaban Apixaban Edoxaban Arterial thrombosis. The primary trigger of Prodrug No Yes No No No (KDTKP Pulmonary This is classically divided into three pathways. The extrinsic pathway (also known as the Bioavailability Over 90% 6% 80% 60% 50% this is rupture of an atherosclerotic plaque, embolism ▶ tissue factor pathway) initiates coagulation.
    [Show full text]