Anticalciques Flashcards

1
Q

Role du calcium

A

entre par LTCC voltage-dependant -> fuzzy space du RS -> RYR: laisse sortir du Ca -> troponine C -> contraction musculaire

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2
Q

Caracteristiques du LTCC

A
  • pore de specificite
  • ouvert/inactive/ferme
  • isoformes differents (genes differents, epissage alternatif)
  • cinetique propre
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3
Q

Classes d’anticalciques et cibles

A
  • phenylalkylamines: Verapamil -> MSC
  • benzodiazepines: Diltiazem -> MSC
  • dihydropyridines: Amlodipine, Nifedipine, …-ine -> ML (vasodilatation)
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4
Q

Vasodilatation (es)

A
  • arterielle >< veineuse
  • induit hypotension (recherchee)
    ! si trop brusque: activation orthosympathique reflexe + augmentation des besoins en O2 du myocarde (par VD)
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5
Q

Effets cardiaques

A
  • LTCC-bloqueur < non-DHP
  • inotrope - (negligable, augmentation du DC par diminution des RPT)
  • chronotrope -
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6
Q

Anticalcique pour anomalie du rythme (lequel pour laquelle)

A

Verapamil pour TSV (chronotrope -)

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7
Q

Indications d’AC

A

HTA systolique non-adrenergique a renine basse: association avec b-bloquants ou IEC (synergie)

Angor: DHP (VD) + b-bloquant (contre OS reflexe)

  • CMHO
  • syndrome de Raynaud
  • vasospasme cerebral (nimodipine)
  • TSV
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8
Q

Associations contre-indiquees

A
  • verapamil + b-bloquant complet: BAV complet ou bradycardie
  • verapamil potentialise digitale
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9
Q

Effets secondaires

A
  • hypotension
  • cephalees
  • oedemes (vasodilatation arterioles pre-capillaires augmente la pression hydrostatique dans les capillaires)
  • nausees
  • bouffees de chaleur
  • troubles du rythme
    ! IC
  • constipation
  • crampes musculaires
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10
Q

Nifedipine

A

VD arterielle

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11
Q

Nicardipine

A

selectivite vasculaire ++ (coronaire), moins inotrope -

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12
Q

Amlodipine

A

VD arterielle amortie >< tachy reflexe

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13
Q

Felodipine

A

selectivite vasculaire sans effet inotrope -, tachy reflexe

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