Haemostasis- Conditions Flashcards

1
Q

What is DIC?

A

Disseminated intravascular coagulation

Excessive and inappropriate activation of the haemostatic system

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2
Q

What causes DIC?

A

Multiple Clotting Factor Deficiency

  • sepsis
  • obstetric emergencies
  • malignancy
  • hypovolaemic shock

Microvascular thrombus formation - end organ failure
Clotting factor consumption - bruising, purpura, generalised bleeding

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3
Q

Presentation of DIC

A

Acute illness and shock

Ranges from no bleeding to profound haemorrhage

- Bleeding may occur from the mouth, nose and venepuncture sites, and there may be widespread ecchymoses - Thrombotic events - any organ may be involved but the skin, brain and kidneys are most often affected
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4
Q

Investigations for DIC

A

Bloods-

PT, APTT, TT very prolonged
Fibrinogen levels reduced

High D-dimer (intense fibrinolytic activity)
Thrombocytopenia
Fragmented RBC on film

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5
Q

Management for DIC

A

Treat underlying cause

Replacement therapy-
Platelets, plasma, fibrinogen

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6
Q

What is haemophilia?

A

X-linked recessive hereditary disorder

Leads to abnormally prolonged bleeding that episodically recurs

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7
Q

What causes haemophilia?

A

Single clotting factor deficiency

Depends on type

Haemophilia A -> factor VIII deficiency
Haemophilia B -> factor IX deficiency

A is 5x more common than B

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8
Q

Pathophysiology of haemophilia

A

Primary haemostasis is normal

Common to bleed from medium and large vessels into joints

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9
Q

Presentation of haemophilia

A

In mild cases-
Bleeding after injury or surgery

Severe cases-
Recurrent haemarthroses into hinge joints, soft tissue bleeds, toddler bruising, prolonged bleeding after dental extractions, surgeries and other invasive procedures

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10
Q

Investigations for haemophilia

A

Isolated prolonged aPTT (as this tests for intrinsic pathway function)
Normal PT and TT

Coag factor assays -> factor VIII

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11
Q

How is haemophilia managed?

A

Factor replacement therapy (A8 B9)

Prophylaxis of clotting factors preventing spontaneous bleeding (common in severe)

Desmopressin stimulates vWF release
Tranexamic acid- anti-fibrinolytics

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12
Q

What is a complication of the replacement infusions?

A

Autoantibodies may be formed making it ineffective

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13
Q

What is Von WIllerbrand disease

A

Deficiency of vWF

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14
Q

What causes VW disease?

A

Autosomal dominant chromosome 12 mutation

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15
Q

What is the pathophysiology behind VWF deficiency ?

A

VWF plays role in platelet adhesion -> deficiency means defective temporary platelet plug

Also can lead to factor VIII deficiency

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16
Q

How does VW disease present?

A

Depends on severity

Can be mild bleeding after minor trauma, nosebleeds and menorrhagia, to severe bleeding for prolonged time

Tends to be more mucosal, so affects mouth (but haemophilia doesn’t)

17
Q

Investigations for VW disease

A

FBC- microcytic or low platelet

APTT may be long if factor 8 affected, but normal PT

VWF antigen test

18
Q

How is VW disease treated?

A

Conservative management

In severe cases-
Desmopressin or tranexamic acid

New but replacement therapy

19
Q

What is TTP?

A

Thrombotic thrombocytopenic purpura
Rare thrombotic microangiopathy

20
Q

What is TTP characterised by?

A

Pentad of haemoytic anaemia, thrombocytopenia, fever, renal failure, and neuro involvement

21
Q

What causes TTP?

A

Metalloproteinase ADAMTS13 deficiency

Triggered by medication, AIDS, malignancy

22
Q

Presentation of TTP

A

Pentad of:

fever
haemolytic anaemia
thrombocytopenia
acute renal failure
neurological symptoms

23
Q

How is TTP investigated?

A

Bloods consistent with haemolysis-
Schistocytes and high retic

May have elevated creatinine, LDH, and bilirubin

Urinalysis- proteinuria and haematuria

24
Q

How is TTP treated?

A

IV plasma exchange with IV methylprednisone and rituximab

Splenectomy as last resort or recurrent relapses