Inherited Diseases of Coagulation Flashcards
Importance of evaluating bleeding episodes in a patient’s history when a bleeding disorder is suspected
Is the bleeding out of proportion to the challenge/injury?
Importance of a physical examination in a patient’s history when a bleeding disorder is suspected
?
Importance of evaluating family history in a patient’s history when a bleeding disorder is suspected
Sex-linked vs. autosomal
Importance of evaluating drug history in a patient’s history when a bleeding disorder is suspected
?
Importance of evaluating the presence of existing diseases in a patient’s history when a bleeding disorder is suspected
?
Six types of coagulation disorders which may have normal screening tests
- von Willebrand disease (many variations)
- Mild hereditary factor deficiencies
- Factor XIII deficiency
- Dysfibrinogenemia
- Mild qualitative platelet disorders
- Mild acquired inhibitors
Factor VIII deficiency (Hemophilia A)
- How is it inherited?
Sex-linked recessive
Factor VIII deficiency (Hemophilia A)
- Treatment
- Factor VIII concentrate
- DDAVP (vasopressin than stimulates teh production of VIII:C and VIII:vWF)
Factor IX deficiency (Hemophilia B)
- How is it inherited?
Sex-linked recessive
Factor IX deficiency (Hemophilia B)
- Treatment
- Factor IX concentrates
von Willebrand disease
- How is it inherited?
- Autosomal dominant
- Autosomal recessive
von Willebrand disease
- Bleeding episodes
- Mucus membrane bleeding
- Superficial wound bleeding
- Bleeding w/ other hemostatic chanllenges (surgery, childbirth)
- Menorrhagia
von Willebrand disease
- Coagulation test results
- PLT: normal
- BT: prolonged
- PLT aggregation studies: absent w/ ristocetin, normal w/ other agonists
- PT: normal
- APTT: prolonged (usually)
- VIII assay: decreased (usually)
- VIII: vWF Ag decreased
von Willebrand disease
- Treatment
- Humate
- DDAVP
- AMICAR
Hemophilia A vs. von Willebrand disease
- APTT
- Hemophilia A: prolonged
- von Willebrand disease: prolonged (usually)
Hemophilia A vs. von Willebrand disease
- Bleeding time
- Hemophilia A: normal
- von Willebrand disease: prolonged
Hemophilia A vs. von Willebrand disease
- Factor VIII activity
- Hemophilia A: decreased
- von Willebrand disease: decreased (usually)
Hemophilia A vs. von Willebrand disease
- VIII: vWF Ag
- Hemophlia A: ??
- von Willebrand disease: decreased
Hemophilia A vs. von Willebrand disease
- Platelet aggregation
- Hemophilia A: ??
- von Willebrand disease: absent w/ ristocetin, normal w/ other agonists
Hemophilia A vs. von Willebrand disease
- PT
- Hemophilia A:
- von Willebrand disease: normal
Congenital Afibrinogenemia
- Bleeding episodes
Bleeding w/ every hemostatic challenge
Congenital Afibrinogenemia
- Coagulation test results
- PT: increased
- APTT: increased
- TCT: increased
- Fibrinogen: absent
- BT: increased
- PLT aggregation: None (WHY??)
Congenital Afibrinogenemia
- Treatment
Cryoprecipitate
Congenital Hypofibrinogenemia
- Bleeding episodes
Mild to absent bleeding episodes
Congenital Hypofibrinogenemia
- Coagulation test results (PT, APTT, TCT, fibrinogen)
- PT: increased
- APTT: increased
- TCT: increased
- Fibrinogen: low (< 100 mg/dL)
Congenital Hypofibrinogenemia
- Treatment
Cryoprecipitate
Congenital Dysfibrinogenemia
- Bleeding episodes
Asymptomatic to mild bleeding episodes