Pre-4: Qualitative Disorders of Platelets Flashcards

1
Q

Optical Platelet Aggregometry

Sample:

A

PRP

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2
Q

Optical Platelet Aggregometry

Principle

A

Light Transmittance

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3
Q

Whole Blood Aggregometry:

Sample

A

Whole blood

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4
Q

Whole Blood Aggregometry:

Principle

A

Electrical impedance

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5
Q

Platelet Lumi Aggregometry:

Sample

A

Both WB & PRP

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6
Q

Platelet Lumi Aggregometry:

Principle

A

Chemiluminescence

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7
Q

As platelets aggregates form, more light passes through the PRP and the tracing begins to move toward 100% light transmittance.

A

Optical Platelet Aggregometry

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8
Q

As Platelet aggregate, platelets collect on the electrodes impeding the current. The change is amplified and recorded.

A

Whole Blood Aggregometry

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9
Q

Reagent added in Platelet Lumi Aggregometry

A

Luciferin-luciferase enzyme

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10
Q

Biphasic Curve agonists:

A

Thrombin
ADP
Epinephrine

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11
Q

Monophasic Curve agonists:

A

Collagen
Arachidonic acid
Ristocetin

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12
Q

RECEPTORS of Thrombin

A

PAR-1, PAR4;
GPIba & GPVI

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13
Q

Receptors of ADP

A

P2Y1 & P2Y12

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14
Q

Receptors of Epinephrine

A

A2- Adrenergic receptor

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15
Q

Receptors of Collagen

A

GPIa/GPIIa & GPVI

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16
Q

Receptors of Arachidonic acid

A

TPa and TPb

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17
Q

Receptors of Ristocetin

A

GPIb/IX/V with vWF

18
Q

GP Ib/IX/V complex is missing ‘

A

Bernard-Soulier Syndrome (Giant Platelet Syndrome)

19
Q

Inability to bind to vWF accounts for the inability of platelet to adhere to exposed sub endothelium and results to the bleeding characteristics

A

Bernard-Soulier Syndrome (Giant Platelet Syndrome)

20
Q

Laboratory feature: Giant Platelets

A

Bernard-Soulier Syndrome (Giant Platelet Syndrome)

21
Q

Aggregometry: No aggregation to Ristocetin

A

Bernard-Soulier Syndrome (Giant Platelet Syndrome)

22
Q

Deficiency/abnormality of GPIIb/IIIa

A

Glanzmann Thrombasthenia

23
Q

Dense Granule Deficiency

A
  1. Hermansky-Pudlak Syndrome
  2. Chediak-Higashi Syndrome
  3. Wiskot-Aldrich Syndrome
  4. Thrombocytopenia Absent Radius (TAR) Syndrome
24
Q

Alpha Granule Deficiency

A

Gray Platelet Syndrome

25
Chromosome 19 mutation
Hermansky-Pudlak Syndrome
26
Hallmark: Swiss-chess platelets (marked dilation)
Hermansky-Pudlak Syndrome
27
Mutations in Chromosome 1
Chediak-Higashi Syndrome
28
Giant lysosomal granules
Chediak-Higashi Syndrome
29
X-linked disease
Wiskot-Aldrich Syndrome
30
Mutations in the WAS gene on the short arm of the X chromosome (Xp11.23)
Wiskot-Aldrich Syndrome
31
Hallmark: TORCH infections
Wiskot-Aldrich Syndrome
32
Congenital absence of radial bones
Thrombocytopenia with Absent Radius Syndrome (TAR)
33
Cardiac and skeletal abnormalities
Thrombocytopenia with Absent Radius Syndrome (TAR)
34
Structural defects of platelet dense granules
Thrombocytopenia with Absent Radius Syndrome (TAR)
35
Gray appearance in platelets in Wright’s stain
GRAY PLATELET SYNDROME
36
Characterized by: Large platelets
GRAY PLATELET SYNDROME
37
Mutations in the NBEAL2 gene (614169) on chromosome 3p21
GRAY PLATELET SYNDROME
38
The specific absence of morphologically recognizable alpha granules
GRAY PLATELET SYNDROME
39
Increased levels of Platelet factor 4 and B-thromboglobulin in the plasma
GRAY PLATELET SYNDROME
40
A rare disorder in which both alpha and dense granules are deficient
Alpha-Dense Storage Pool Deficiency
41
Autosomal dominant bleeding disorder which results to a deficiency in multimerin
Quebec Platelet Disorder
42
a multimeric protein that is stored complexed with factor V in the alpha granules of platelets
Multimerin