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Bleeding Disorders of Importance in Dental Care and Related Patient Management

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Bleeding Disorders of Importance in Dental Care and Related Patient Management Clinical P RACTIC E Bleeding Disorders of Importance in Dental Care and Related Patient Management Contact Author Anurag Gupta, BDS; Joel B. Epstein, DMD, MSD, FRCD(C); Robert J. Cabay, MD, DDS Dr. Epstein Email: [email protected] ABSTRACT Oral care providers must be aware of the impact of bleeding disorders on the manage- ment of dental patients. Initial recognition of a bleeding disorder, which may indicate the presence of a systemic pathologic process, may occur in dental practice. Furthermore, prophylactic, restorative and surgical dental care of patients with bleeding disorders is best accomplished by practitioners who are knowledgeable about the pathology, com- plications and treatment options associated with these conditions. The purpose of this paper is to review common bleeding disorders and their effects on the delivery of oral health care. For citation purposes, the electronic version MeSH Key Words: blood coagulation/physiology blood coagulation disorders/complications dental care is the definitive version of this article: www.cda-adc.ca/jcda/vol-73/issue-1/77.html entists must be aware of the impact of The patient should be asked for any history bleeding disorders on the management of significant and prolonged bleeding after Dof their patients. Proper dental and med- dental extraction or bleeding from gingivae. ical evaluation of patients is therefore neces- A history of nasal or oral bleeding should sary before treatment, especially if an invasive be noted. Many bleeding disorders, such as dental procedure is planned. Patient evalua- hemophilia and von Willebrand’s disease, tion and history should begin with standard run in families; therefore, a family history medical questionnaires. Patients should be of bleeding disorders should be carefully queried about any previous unusual bleeding elicited. episode after surgery or injury, spontaneous A complete drug history is important. If a bleeding and easy or frequent bruising. For patient is taking anticoagulant drugs, it will the purpose of history-taking, a clinically sig- be important to consult his or her physician nificant bleeding episode1 is one that: before any major surgical procedure. In addi- tion, a number of medications may interfere • continues beyond 12 hours with hemostasis and prolong bleeding. Drugs • causes the patient to call or return to the of abuse, such as alcohol or heroin, may also dental practitioner or to seek medical cause excess bleeding2 by causing liver damage treatment or emergency care resulting in altered production of coagulation • results in the development of hematoma or factors. Illicit injection drug use carries an in- ecchymosis within the soft tissues or creased risk of transmission of viral pathogens • requires blood product support. that may lead to viral hepatitis and altered Most reported bleeding episodes are minor liver function. and do not require a visit to the dentist or A general examination of the patient might the emergency department and do not affect indicate a tendency to bleed. Multiple pur- dental treatment significantly. purae of the skin, bleeding wounds, evident ���JCDA • www.cda-adc.ca/jcda • February 2007, Vol. 73, No. 1 • 77 ––– Epstein ––– Table Common bleeding disorders • activated partial thromboplastin time to evaluate the intrinsic coagulation Coagulation factor Congenital pathway (normal range: 25 ± 10 seconds) deficiencies Hemophilia A and B • international normalized ratio to von Willebrand’s disease measure the extrinsic pathway (normal Other factor deficiencies (rare) range: 1.0) Acquired • platelet count to quantify platelet function Liver disease (normal range: 150,000–450,000/µL). Vitamin K deficiency, warfarin use Disseminated intravascular coagulation Types of Bleeding Disorders Platelet disorders Quantitative disorder (thrombocytopenia) Bleeding disorders can be classified as Immune-mediated coagulation factor deficiencies, platelet dis- Idiopathic orders, vascular disorders or fibrinolytic de- Drug-induced fects (Table 1).3,4 Collagen vascular disease Among the congenital coagula- Sarcoidosis tion defects, hemophilia A, hemophilia B Non-immune-mediated (Christmas disease) and von Willebrand’s Disseminated intravascular coagulation disease are the most common. Hemophilia Microangiopathic hemolytic anemia A is due to a deficiency of clotting factor Leukemia VIII or antihemophilic factor. It is an inher- Myelofibrosis ited X-linked recessive trait found in males. Qualitative disorder Symptoms may include delayed bleeding, Congenital ecchymosis, deep hematomas, epistaxis, Glanzmann thrombasthenia spontaneous gingival bleeding and hemar- von Willebrand’s disease throsis. A factor VIII level of 6% to 50% of Acquired normal factor activity (mild hemophilia) is Drug-induced associated with bleeding during surgery or Liver disease trauma; 1% to 5% with bleeding after mild Alcoholism injury; and < 1% (severe hemophilia) with Vascular disorders Scurvy spontaneous bleeding.3 Purpura Management of hemophilia A among Hereditary hemorrhagic telangiectasia patients undergoing dental surgery con- Cushing syndrome sists of2 increasing factor VIII levels, Ehlers-Danlos syndrome replacing factor VIII and inhibiting fib- Fibrinolytic defects Streptokinase therapy rinolysis (Table 2). Desmopressin (DDAVP) Disseminated intravascular coagulation is used to achieve a transient increase in factor VIII level through the release of en- dogenous factor VIII in patients with hemophilia A and hematomas or swollen joints may be evident in patients von Willebrand’s disease. It may be sufficient to achieve with severe bleeding defects. In addition, patients may hemostasis in mild forms of these diseases. DDAVP may show signs of underlying systemic disease. Patients with be combined with antifibrinolytic agents to increase its 2 liver disease may have jaundice, spider nevi, ascites and effectiveness. other signs of impaired hepatic function. A cardiac pa- Options for factor VIII replacement are factor VIII tient can show tachycardia or hypertension, which may concentrates, fresh frozen plasma and cryoprecipitate. make hemostasis more difficult to achieve. Evidence of Highly purified forms of factor VIII concentrates, manu- petechiae, ecchymoses, hematomas or excessive gingival factured using recombinant or monoclonal antibody purification techniques, are preferred because of their bleeding should direct the practitioner’s attention toward greater viral safety.5,6 New generations of recombinant a possible underlying bleeding disorder. When a bleeding factor VIII are being developed that are free from human disorder is suspected, laboratory investigations, including and animal proteins, in an attempt to further improve blood counts and clotting studies, should be carried out. 7 1,2 their safety. In patients who produce antibodies to factor Preoperative laboratory tests of the hemostatic system VIII, a higher dose of concentrated factors can be consid- are: ered, but a focus on local measures is critical. • bleeding time to determine platelet function (normal Antifibrinolytic therapy can be used postoperatively range: 2–7 minutes) to protect the formed blood clot. Epsilon-aminocaproic 78 JCDA • www.cda-adc.ca/jcda • February 2007, Vol. 73, No. 1 • ––– Patients with Bleeding Disorders ––– Table 2 Presurgery treatment for hemophilia A4 �ondition Treatment and dose Potential complications Mild bleeding Dose: 15 U/kg factor VIII every 8–12 hours Hemarthrosis, oropharyngeal or dental bleeding, for 1–2 days epistaxis, hematuria Target: 30% of normal level Major bleeding Dose: 50 U/kg factor VIII every 8–12 hours Same potential complications as for mild bleeding, for 7–14 days as well as central nervous system hemorrhage, Target: 80% to 100% of normal level retroperitoneal hemorrhage, gastrointestinal bleeding Adjunctive therapy Desmopressin, tranexamic acid or epsilon- aminocaproic acid (for mild disease) Table Systemic diseases causing coagulopathies1 �isease �ommon causes Resulting coagulation defect Renal failure and uremia Diabetes mellitus Inhibition of adhesion and primary aggregation Glomerulonephritis of platelets from glycoprotein IIb–IIIa deficit Pyelonephritis Hypertension Hepatic failure Alcohol abuse Obstructive jaundice: deficiency of vitamin Hepatitis B and C K-dependent factors II, VII, IX and X Cancer (e.g., hepatocellular Loss of liver tissue and all clotting factors except carcinoma) VIII and von Willebrand’s factor Bone marrow failure Alcohol abuse Reduced number of functioning platelets Cancer (e.g., leukemia) Anemia from bone marrow suppression Myelosuppressive medications (e.g., chemotherapy for cancer) Uremia from renal failure acid and tranexamic acid are the common agents used. Other than congenital diseases, coagulation de- Tranexamic acid in an oral rinse helps prevent postopera- fects may be acquired and from a variety of sources tive bleeding from surgical wounds. Postoperative use of (Table 3). In liver diseases, the synthesis of clotting factors epsilon-aminocaproic acid can considerably reduce the may be reduced due to parenchymal damage or obstruc- 11 level of factor required to control bleeding when used tion. These patients may have a variety of bleeding dis- in conjunction with presurgical infusion of factor VIII orders depending on the extent of their liver disease. concentrate.8–10 Management options for hemostatic defects in liver disease5 include vitamin K and fresh frozen plasma Hemophilia B is the result of factor IX deficiency. It infusion (immediate but temporary effect) for
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