51 hémostase primaire Flashcards

1
Q

Quel contenu des plaquettes?

A

ya dns la memebrane

  • acide arachidonique
  • GP1b GP2b GP3a
  • rc comme celui adp -> P2Y12
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2
Q

Qu’est ce qu’il y a dimportant dns la paroi vx?

A
  • prostacyclines dans l endothelium
  • collegene et TF dans le sous endothelium
  • intima -> contraction
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3
Q

Cite les titres des etapes?

A
  • adhesions
  • activation (FMG)
  • Aggregation
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4
Q

Exploration

A
  • taux de plaquettes
  • *eliminer fausse thrombopenie, aggregation plaquettaire sur frottis /prelevement sur tube citraté
  • Temps de Saignement plus que 10MIN (methode d’IVY)
  • plaquettes
  • *agregabilité (agregometrie)
  • *contenu en glycoproteines (cytometrie en flux)
  • *duree de vie (marquage)
  • dosage fibronogène
  • dosage vwF
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5
Q

facteurs de coagulation n etant pas secretes au niv du foie?

A

vWF et F8

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6
Q

vitk dependants?

A

10 9 7 2 (1097)2

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7
Q

types des facteurs de coag

A

-cofacteurs (LaVa) + (KHPM)
zymogenes
substrat: fibrinogene
recepteurs; FT

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8
Q

3 phases de coagulation, resultat dechacune?

A

Initiation -> small quantityof fibrine
Amplification -> DIESEL et LAVA
ofc propagation

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9
Q

3 elements de regulation de coag

A

-sys protc / protS
ANtithrombine (anti2)
TFPathwayInhibitor TFPI

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10
Q

comment se fait exploration coag?

A
  • dosage des facteurs specifiques
  • voie extrinseque (majoritaire)
  • *temps d quick : tmps de coag à 37% PPP + ca2+ + TF
  • *taux de prothrombine (t de Q en %)
  • *INR = tdq malade/ tdq temoin
  • voie intrinseque
  • *TCA: taux de cephaline activée -> PPP + ca2+ + caphaline + activateur de la phase contact
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11
Q

quelle voie de coag est majoritaire

A

-exstrinseque

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12
Q

element indispensable à la coagulation et à son exploration?

A

-ca2+

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13
Q

vwF, f8 et fibrinogène, f3 synthétisés ou?

A

-f3 se trouve en sous endothelial secrete par le clls adventicielles
vwf+ f8 cell endothelial et megacaryocytes
fibrinogene foie

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14
Q

f2/f2a app?

A

-prothrombine . thrombine

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15
Q

f1, f1a app?

A

-fibrinogene, fibrine

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16
Q

what keeps coagulation from propagation to other partsof the body?

A

-proteine c (vitk dep) en presence de prot S, activée par 2a thrombine, desactive LaVa

17
Q

fun fact coag?

A

-

18
Q

Belle et diesel appelation?

A
BOF= 9a 8a complexe tenase (10ase) intrinseque
DIESEL= complexe prothrombinase
19
Q

Inhibiteurs du systeme plamsinogene?

A

-TAFI / PAI1 et2 / alpha2 antiplasmine et alpha 2 macroglobuline

20
Q

exploration systeme plasminogene?

A

DIRECT= temps de lyse d’un cailot
INDIRECT =
*dosage PDF nons specifique
*Dosage DDIMERES specifuqe ave valeur NEGATIVE 98% maladie atheromateuse
*Dosage fibrinogne (car detruit par la plasmine) ave le FIa
TESTS ANALYTIQUE
Tpa pr le +
PAI1 et alpha2 AP pr -
Plasminogene la source la MATIERE PREMIERE