Biphosphonates Flashcards

1
Q

Propriétés MDP

A

Accumulation osseuse: 45-55% à 3h
Élimination urinaire: 59% à 3h
Bon rapport os/tissus mous
Bon rapport lésion/os normal

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2
Q

Bisphosphonates hydrolysés ou non par phosphatases alcalines?

A

Non

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3
Q

Administration MDP

A

IV

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4
Q

Pharmacocinétique

A
Libre ds plasma
Diffuse ds LEC
Filtré par glomérule
Fixation osseuse au CA2+
Faible fixation sur matrice collagène
Fixation importante sur cristaux d'hydroxyapatite en formation
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5
Q

Fixation squelettique dépend de

A

DSR
Activité ostéoblastique
Volume LEC
Vitamine D

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6
Q

Élimination = visualisation

A

Reins
Vessie
Tissus mous

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7
Q

Utilisation du MDP

A

Scinti osseuse et articulaire

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8
Q

Méthode de marquage

A

Synthèse chimique directe

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9
Q

Réduction Tc

A

IV

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10
Q

Complexe moléculaire MDP

A

2 molécules de biphosphonates entourant Tc

Liaison coordinence très stable

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11
Q

Péremption MDP

A

6-12 post reconstitution

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12
Q

Antioxydants dans MDP

A

PABA

Acide ascorbique

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13
Q

Présence antioxydants?

A

Empêche oxygène réagir avec agent réducteur

Empêche réoxydation du Tc qui briserait liaison avec ligand=plus grande période de péremption

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