7.5 Intro to Antimicrobials Flashcards Preview

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Flashcards in 7.5 Intro to Antimicrobials Deck (15)

What is selective toxicity?

-Microbes can have structures and or processes that human cells do not have.
-Anti-mictobial "selective toxicity" refers to the ability of these drugs to kill or inhibit the growth of microbes, leaving the human host unharmed.


What is pharmacodynamic bactericidal principles used for?

-Used for antibacterial dosage regimen design


What is a concentration dependent killer?

Peak/MIC best activity when the peak drug level exceeds the MIC by a certain magnitude.


What is a time dependent killer?

Time is greater than MIC, best activity when the drug level stays above MIC


Explain the post antibiotic effect?

Both time dependent killer and concentration dependent killer can include post antibiotic effect when bacterial growth is inhibited for a time after the drug levels drop below the MIC of the organism


How can the post antibiotic affect antibacterial dosing?

Can allow for a longer interval between drug doses


What is Antibiotic Effectiveness?

1) Must reach its target in an active form
2) Bind to the target
3) Interfere with its function


What are mechanisms of Antibiotic Resistance?

1) The drug does not reach its target
2) the drug is inactivated
3) The target or biochemical pathways is altered so drug cannot bin and or act
4) Altered target site decreased up take, decreased penetration, increased efflux, enzymatic inactivation or modification, and bypass pathways.


What are some antibiotic resistance concerns?

1) some bacteria are able to survive every modern antibiotic.
2) Antimicrobial resistance is a problem so serious that it threatens the achievements of modern medicine. A post antibiotic era is which common infections and minor injuries can kill- far from being an apocalyptic fantasy is instead a very real possibility for the 21st century.


Where does research show antimicrobial resistance is stemming from?

It may be coming from antibiotics used in agriculture.


What are some ways to improve antibiotic utilization?

1) Formulary restriction and preauthorization.
2) Prospective audit with intervention and feedback.
3) Standardized order sets and clinical pathways (Foster evidence based prescribing.
4) Antimicrobial order forms
5) De-escalation of therapy (review culture and sensitive results)
6) Dose optimization
7) Intravenous to oral dose conversion


What is MIC?

Minimum inhibitory concentration


What is De-escalation of antimicrobial therapy?

-Review culture and sensitivity (C&S) results; on going review of therapy.
-Discontinue antimicrobials
-Switch to more focused therapy based on culture/sensitivity results
-Change to oral antimicrobials


What is an antibiogram?

It is a local summary of selected antibiotic activity versus common bacterial isolates; it is used for drug formulary decision and to guide empiric treatment.


In the culture and sensitivity reports what does S, R, and I stand for?

R= Resistant