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2016年12月6日 星期二

[醫如往常] Senior Clerkship Day 101: Lab Medicine: CBC

醫師 CBC
第一屆公費生, 台大第二屆CP
住院醫師時沈明鏡教授叫他到腫瘤科Run.
早上六點半上班 晚上十二點半回家
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Doctors' doctor
AP, CP 各四年
美國都是雙專科
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PRC叫檢驗醫師
台灣以前叫實驗診斷科
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衛福部只能登記兩個專科
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Anemia workup
Blood smear
RPI

Beta thalassemia
  • HbA2 >3.5%
  • RBC count
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IDA
常合併Thrombocytosis
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Reticulocyte
會有Polychromatosis
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Evans syndrome; Immunopancytopenia
  • Thrombocytopenia
  • Retuiculative giant platelet

Evans syndrome is an autoimmune disease in which an individual's antibodies attack their own red blood cells and platelets.[1] Both of these events may occur simultaneously or one may follow on from the other.[2]

The diagnosis is made upon blood tests to confirm not only hemolytic anemia and immune thrombocytopenic purpura, but also a positive direct antiglobulin test (DAT) and an absence of any known underlying cause.[2]
Other antibodies may occur directed against neutrophils and lymphocytes,[7] and "immunopancytopenia" has been suggested as a better term for this syndrome.[8]


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MCHC
Hb/Hct
Hemolysis也會高(Hct)
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Intracellular hemolysis
Pseudo hyper Hb
Hb 12.5 很喘
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Spherocytosis
  • Microcytic, immune, life-threatening
  • Macrocytic, hereditary
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Fragmented RBC
Pseudo thrombocytosis 有些儀器無法區分
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Cold agglutinin
拿一滴血在玻片加冰塊
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NRBC
  • 現在不用校正WBC
  • 常用在Newborn
  • Cancer, bone cancer, bone metastasis
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Giant platelet
  • 看MPV大小
  • Platelet count fluctuates
  • PDW不是很準
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Plt clumping
  • Pseudothrombocytopenia, 不要直接切spleen,先想原因:EDTA-Induced, Poor sampling, Macrothrombocytopenia( Giant platelet, hereditary disease)
  • Hit; heparin-induced thrombocypenia
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APL會DIC要緊急輸血
其他情況沒有出血不要急著輸血,先找underlying
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沒有好的檢查
可以Experience therapeutic trial
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Band現在證實跟infection無關
Neonatal infection才看immature/segmented ratio
Rheumatologist用ESR, 因為藥物會影響CRP
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PFA-100美國用在vWD screening
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Bleeding, closure time
100,000以下做一定長,不用做
常受到Alcohol, chocolate, flu drug,感冒藥影響
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VeryfyNow monitor of anti-platelet

Thromb J. 2009; 7: 4.
Published online 2009 May 6. doi:  10.1186/1477-9560-7-4
PMCID: PMC2683811
Comparison of VerifyNow-P2Y12 test and Flow Cytometry for monitoring individual platelet response to clopidogrel. What is the cut-off value for identifying patients who are low responders to clopidogrel therapy?
Conclusion
In conclusion our findings show that a cut-off value of 15% inhibition or > 213 PRU in the VerifyNow-P2Y12 test may provide the best accuracy for the identification of patients with LR.
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Plavix resistance (PlavixProdrug)
做完心導管restenosis
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PT, aPTT檢查管要上下搖六下,共12下
Insensitive

千萬不要用在early DIC診斷.   Tertiary hemostasis
Check liver reserve
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TMA; Thrombotic microangiopathy
  • TTP 1982 B61-09 Han-Mou Tsai蔡漢謀學長發現ADAMTS13
Physician, Professor of Medicine and Pathology, M. Elaine Eyster Professor of Hematology
  • HUS
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DICKidney, lung capillary最受影響
  • Acidosis
  • TPR
  • 做blood smear

High sensitive D dimer 配合pretest clinical 才能 rule out
Well's score只能用在門急診,住院、手術後不能使用
減少sono, CT 支出
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Antiphosphatase syndrome
(repeated 12 weeks ACA, anti-Beta2 )
Lupus anticoagulant.  DRVVT, with LA-sensitive aPTT test (較少的phosphalipid)
Prolong thrombin time

  • Thrombosis
  • Recurrent abortion
  • IUFD
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Factor XII deficiency
  • aPTT prolong but thrombosis
  • Paradoxical finding
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NOAC比較安全
Antidote會慢慢上市
告誡病人不要過量,忘記吃千萬不要補吃
緊急時打Prothrombin complex concentrate (PCC, trade names Beriplex, Octaplex,[1] Kcentra, Cofact, among others) is a combination of blood clotting factors II, VII, IX and X, as well as protein C and S,[1] prepared from fresh-frozen human blood plasma. It is used to reverse the effects of oral anticoagulation therapy when bleeding occurs (e.g. in the brain or gut) requiring rapid action to accelerate coagulation.[2][3] PCC is effective but expensive.[vague] In the UK, it is prescribed in discussion with a haematologist. It is available as a powder and solvent for solution for injection.[2]
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Warfarin 老鼠藥的親戚
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High sensitive CRP 用在評估血管功能
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INR 受飲食習慣影響

確認實驗室aPTT的治療時間對應: heparin level 0.3-0.7
最好搭配anti-Xa activity檢查
Heparin resistance受到antithrombin影響

Low molecule heparin 要用Xa monitor
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Fibrinogen
Monitor tPA therapy
Target 在 100-200
補充cryoprecipitate, or fibrinogen concentrate
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Protein S
C4b complex binding
Pregnancy(ProteinS增加), nephrotic syndrome
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NOAC; Anti-coagulation guideline 由胸腔科制定
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