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1 Coagulation : Case based approach 2 nd Basic hematopathology course, TMH, Mumbai Saturday, 11 th June 2011 Dr. M.B. Agarwal, MD, MNAMS Head, Dept of Haematology, Bombay Hospital Inst of Med Sc, Mumbai
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2 Bleeding disorders
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3 Case 1
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4 Jigar, 15-year old boy from Vadodara with post-traumatic nasal & oral bleeding : 2 hours No family h/o bleeding disorder
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5 Jigar : Lab. investigations TestsResultsControl Hb13.3 g/dl Haematocrit41.4 % WBC7900/cmm Platelets368,000/cmm PT11 s PTT46 s28 s
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6 Differential diagnosis
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7 Factor deficiency or Inhibitors
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8 TestResultControl PTT46 s28 s PTT mix (1:1)30 s What does this mean ?
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9 Factor deficiency
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10 TestResultControl PTT46 s28 s PTT mix (1:1)43 s What does this mean ? (46 + 28 = 74 ÷ 2 = 37)
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11 Inhibitors Factor specificLupus type
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12 Inhibitors Factor specificLupus type KCT dRVVT L1 / L2 > 1.3 Factor assay
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13 Normal coagulation cascade
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14 Intrinsic pathway defect Factor VIII deficiency including von Willebrand Disease Factor IX deficiency Factor XI deficiency (rare) Factor XII deficiency (non-bleeder)
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15 TestResultNormal Factor VIII : C9 %50 - 150 % Factor IX77 %50 - 150 % What does this mean ?
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16 Classical haemophilia A or von Willebrand Disease
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17 vWD has equal prevalence in both sexes (Autosomal)
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18 Coming back to Jigar Bleeding from nose Raised PTT Good correction on mixing studies Low factor VIII : C
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19 Jigar : Further work up TestResultNormal VIII : C9%50-150% vWF : Ag12 %60-150 % vWF : RCoF10 %50-150 %
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20 Jigar : Final diagnosis
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21 Von Willebrand Disease
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22 vWD : Primary classification SubtypesvWF Type 1Partial deficiency (AD) Type 2Qualitative defect (AD) Type 3Total deficiency (AR)
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23 vWD type 2 : sub classification SubtypesCharacteristicsDD 2A* High mol wt vWF multimers absent vWD : Type 1 & Type 2M 2B* Low and High mol wt vWF ↓ ↑ RIPA Thrombocytopenia 2M* High mol wt vWF multimers normal ↓ vWF : CB vWD : Type 2A 2N**Markedly ↓ affinity for factor VIIIHaemophilia *vWF : Ag > vWF : Rco, **AR
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24 vWD : Laboratory tests CBC, platelet count, PT : Normal PTT : often normal Factor VIII (coagulometer) vWF : RCoF (aggregometry) vWF : CB (ELISA) vWF : Ag (ELISA) RIPA : Aggregometry vWF : Multimer analysis (gel electrophoresis)
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25 Variations in vWF levels ( ) Exercise and stress (adrenaline) Infection and inflammation Liver disease Pregnancy Estrogen and progesterone therapy Hyperthyroidism
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26 Genetic variations in vWF levels Blood group O has lowest level Black race has higher level Black with non A may have double the level of a Caucasian with group O Degree of proteolysis varies ADAMTS-13 activity varies
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27 Platelet-type vWD It is not vWD A genetic platelet disorder (AD) A gain-of-function mutation affinity of platelet GP1b for vWF RIPA Thrombocytopenia Phenotype : similar to type 2B Treatment : platelet transfusion and not vWF
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28 Acquired vWD Not an uncommon disease Pts with autoimmune disorders, hypothyroidism, lymphoma, WM Antibodies are present only in a minority Excessive proteolysis or consumption (AS)
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29 Associations Angiodysplastic lesions in gut Atherosclerosis (pigs) Diagnosis may be totally missed during pregnancy and early puerperium Factor VIII level may vary within the family Role of PFA-100
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31 Case 2
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32 Case study Mr. Raj, 69y from Rajkot SC hematomas & easy bruising : 2 mths Platelet count : 3,32,000/cmm PT : 43/12 secs, INR 3.7 PTT : 56/30 secs
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33 What is the differential diagnosis ?
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34 Whenever PT & PTT both are raised ……?
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35 First, we must exclude difficult collection (partially clotted blood)
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36 We must also exclude effect of high haematocrit (polycythemia)
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37 Common pathway defect Vitamin K deficiency Chronic liver disease Consumptive coagulopathy Anticoagulant therapy
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38 Liver function : normal DIC profile : normal
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39 Raj : Mixing studies TestPTPTT Raj4356 Control1230 4 : 1 mix1535
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40 Factor I : 290 mg/dl Factor II : 87% Factor V : 78% Factor X : 1.2%
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41 What is the aetiology of selective factor X deficiency at the age of 69 years ?
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43 Amyloidosis
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44 Raj : Amyloidosis Macroglossia S. Protein electrophoresis : Faint M band present S. Immunofixation : Lambda monoclonal gammopathy Bone marrow : Plasma cells : 2-3% Bone marrow biopsy : Amyloidosis Abdominal fat pad biopsy : Amyloidosis
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45 Part 3 Pictorial quiz
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49 What is this ?
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53 Blue toe syndrome
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54 CoaguloChek
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56 Conclusion
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57 XVIIIth National CME in Haematology & Haemato-oncology on 26 th - 29 th of January 2012 (Thurs - Sun) at Bombay Hospital Inst of Med Sc, Mumbai ( Subsidised registration to participants submitting registration form today)
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58 Thank You
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59 Questions ?
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