Antibiograma Flashcards

1
Q

Ce inseamna CMI?

A

Concentratie minima inhibitorie

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2
Q

Definitia CMI.

A

Cea mai mica concentratie a unui ATB care va inhiba dezvoltarea bacteriana

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3
Q

Cand se realizeaza antibiograma?

A

Dupa stabilirea diagnosticului etiologic
-prin izolarea in cultura pura
-prin identificarea agentului patogen

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4
Q

Susceptibilitate clinica(ATB eficient)

A

Doza de ATB din organism trebuie sa atinga conc. de 2/4 x mai mari decat CMI
(doze obisnuite de atb si fara efecte secundare apreciaile)

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5
Q

Rezistent:

A

Concentratia ATB din organsim < CMI.

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6
Q

Cum se calculeaza conc sigura de ATB?

A

-pe baza farmacocineticii ATB
-pe baza toxicitatii ATB

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7
Q

Metode CALITATIVE

A
  1. Metoda difuziometrica(Kirby-Bauer)
    2.ATB in mediu semisolid (ATB biomerieux)
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8
Q

Metode CANTITATIVE

A

1.Metoda dilutiilor(mediu lichid)
2. E-Test

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9
Q

Metoda DIFUZIOMETRIEI:

A

Avem nevoie de: placi Muller Hinton
1)Se insamanteaza cultura bacteriana(3 directii de insamantare)
2)Se plaseaza discurile de hartie impregnate cu ATB pe suprafata placii inoculate
3)Se incubeaza
4)Dupa incubare apar zone libere

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10
Q

Interpretare:

A

1) Marimea zonei de inhibitie masoara sensibilitatea bacteriei la un anumit ATB
Diametrul zonei libere este d.p. cu susceptibilitatea pentru acel ATB
2) Diametrul se masoara si se consulta cu ajutorul tabelului EUKAST
3) Diametrul apartine unei tulpini “S”(sensibil la acel atb) sau “R”(rezistent)

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11
Q

Metoda dilutiilor SCOP:

A

Determinarea CMI

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12
Q

Metoda dilutiilor PRINCIPIU:

A

1) Medii de cultura lichide
2) Godeuri care contin volume identice de bulion si dilutii secventiat injumatatite ale unui ATB
3) Se adauga volume egale dintr o suspensie ale microorganismului care urmeaza sa fie testat in fiecare godeu
4) Se incubeaza peste noapte
! Se utilizeaza un godeu de control fara ATB !

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13
Q

INTERPRETARE:

A

1) Daca conc de AB <CMI => lichid tulbure (cresterea bact. nu este impiedicata de AB)
2) Daca conc AB>=CMI => lichid clar (cresterea bacteriana este impiedicata de AB) !AB efect bacteriostatic!

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14
Q

Scop E-Test:

A

Este o metoda de difuzie cantitativa pt determinarea susceptibilitatii antimicrobiene a bacteriilor.

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15
Q

METODA E-Test:

A

1) Se fol. medii de cultura solide
2)Benzi impregnate cu ATB pt a determina CMI in miug/mL
!LOCUL IN CARE ZONA DE INHIBITIE INTALNESTE BANDA=CMI!

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