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63 Cards in this Set

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______________ ______________refers to the ability of a drug to injure invading microbes w/o injuring cells of the host
selective toxicity
Narrow spectrum antibiotics are active against ____________________________________ whereas broad spectrum antibiotics are __________________________________.
Narrow only a few microbes, whereas broad wide array.
Bacteria acquire resistance via _____________ a process in which what type of coding for drug resistance is transferred from what to what?
Conjugation, DNA coding transferred from one bacterium to another.
Which one promotes the emergence of drug resistance more- broad or narrow spectrum?
Broad
In the hospital we can delay the emrgence of antibiotic resistance in 4 ways what are they?
1-prevent infection 2-dx and tx infection effectively 3-use antibiotics wisely 4-prevent pt to pt transmission
The use of antibiotics where/for what is a major force for promoting emergence of resistance.
Promoting growth in livestock.
What is MIC stand for and what does it mean?
Minimum inhibitory concentration of an antibiotic means the lowest concentration needed to completely suppress bacterial growth.
Host factors that are the MOST important when an antimicrobial med is prescribed?
Competent immune function
What is MBC stand for and what does it mean?
Minimum bacterial concentration-lowest concentration of a drug that produces a 99.9% decline in # of bacterial colonies (indicating bacterial kill).
Which test is most widely used method for assessing drug sensitivity? A-MIC b-MBC c-broth dilution d-disk diffusion?
D disk diffusion
Up to what % of all hospitialized pt receive antimicrobials?
30
What ways to antibiotics act to kill/stop growth of microbes? 4 possible ways…
1-interferes w/ cell wall 2-interferes w/ protein synthesis 3-interferes w/ dna replication 4-interferes w/critical metabolic reactions.
Antibiotics must be present where? And for how long?
At site of infection and for a sufficient amount of time.
Use combo antibiotics for reasons such as:
mixed infections, prevention of resistance, decreased toxicity, and enhanced bacterial action.
Prophylactic use of antibiotics include:
surgery/bone, bacterial endocarditis, neutropenia, STD exposure, recurrent UTI’s, TB
What are the clinical indicator of successful antibiotic tx?
Reduction of: fever, a decrease in WBC, reduction of redness, inflammation, drainage and pain.
Penicillians work by doing what?
Weaken cell wall causing lysis and death
Some bacteria produce resist pen by producing what?
Penicillinases (aka beta-lactamases)
Gram ____________ bacteria are resistant to penicillins that cannot penetrate the ?
negative, cell envelope.
The most common adverse effect of pen is what?
Allergic reaction
What is the percent chance that a person allergic to pen is also allergic to cephalosporins?
1%
If a person is allergic to pen what can they more than likely be safe taking?
Vanco, erythro, and clindamycin
The main difference among the penicillins relate to what?
Spectrum, stability in stomach acid and duration of action.
Pen G vs Pen V which can be taken orally?
penV, penG is IV only
Pens work well on which? Gram – or +?
Gram+
What are the enzymes that render penicillin inactive?
Beta-lactamases
What is the biggest adverse effect for pens (not allergy).
GI upset
Pen allergy can be immediate, accelerated or late. What is the time frame for each? Pen allergies are usually which?
Immed-2-30min. accelerated-1-72hrs, late-days or weeks. Immed or late.
Anaphylaxis involves _________edema, broncho______ and severe ____-tension.
Laryngeal edema, bronchoconstriction, severe hypotension
Beta-lactamase inhibitors extend the antimicrobial spectrum w/ penicillinase-sensitive antibiotics. What is the name of the one in augmentin?
Clavulanic acid
Pen G/V used for what? Narrow or broad?
Streptococcus-meningitis, pneumonia, gas gangerene, anthrax, syphilis. Phyrophylasis of bacterial endocarditis. Narrow
Amoxiciliian used for what? Narrow or broad?
Used for e coli, salmonella and shigella. Broad spectrum. Most common adverse effects are rash and diarrhea
Pen can not be combined w/ what in same IV solution?
Aminoglycosides
Pen patient edu is what?
Take wi/ full glass of water . complete course even if feeling better.
What to monitor for pen?
Kidney function. Measuring intake/output.
Cephalosporins act by doing what?
Weaken bacterial cell wall causing lysis and death.
The major cause of cephalosporin resistance is from production of what?
Beta-lactamases
As the cephalosporin generation go from 1 to 4 they increase in activity agains gram ? bacteria, they increase resistance to destruction by ____________ and they have increased ability to reach what?
Gram -, betalactamases, CSF.
Most common adverse effects of cephalosporins are what?
Allergic reactions.
Cefeotetan can cause ____________ and _______like reaction.
Bleeding, disulfiram
Ceftriaxone is the only cephalosporin not eliminated by the ____________.
Kidneys
Ceftriaxone can not be given with what?
Calcium
Vancomycin works by doing inhibiting cell ______ _______
wall synthesis
Vanco is used in severe infections only like
MRSA, c-diff, those allergic to pen
The route for vanco is what?
IV, except when for c-diff
Common vanco adverse effects include:
redman, ototoxicity, thrombophlebitis, thrombocytopenia, allergy.
What antibiotic is it important to get peak and trough levels on?
vanco
Resistance to pen has 3 factors:
1-inability of pen to reach its target, inactivation of pen by bacterial enzymes 3- production of pen binding proteins PBPs that have a low affinity for pen (MRSA)
Tetracyclines- narrow or broad? Work by what action on the bacterium?
Broad, inhibits protein synthesis.
Tetrachycline uses include-rickettsial disease, cholera, lyme disease,periodontal disease, what skin disease??, what bioterror threat?
Acne, anthrax
Routes for tetracycline?
Oral, parenteral
Pt edu for tetracycline? What can’t u take w/ it?? Why?
Take w/ water, empty stomach, take full course. Can’t take w/ milk, calcium, iron, magnesium laxatives, antacids. It decreases the absorption
Adverse effects of tetracycline include-GI irritation, effects on _________ and _______, suprainfection, toxicity to what organs? Photosensitivity.
Bones/teeth so no to pg women. Liver, kidneys
Macrolides (erythromycin-EES) is used for respitory infections, whooping cough, diphtheria, chancroid, what std? and is substitute for which pen if allergy?
Chylamydia, penG
Erythromycin should be avoided in who?
Pt w/ qt prolongation and those taking inhibitiors of CYP3A4.
Routes for erthyromycin. Most commone s/e?
oral, IV. GI upset
Erythromycin works on bacteria by what action?
Inhibits protein synthesis.
Erythromycin-bacteriocidal or static?
Mostly static
Aminoglycocides –gentamicin. Routes? Narrow or broad?
IM/IV. Narrow
Gnetamicin is used on aerobic or anerobic? Gram+ or gram-?
Aerobic gram-
Gentamicin is not absorbed by the _______ but can cause s/e here.
GI
Adverse effects of gentamicin include what toxicities? And blood dyscrasias.
Ototox, nephrotox,
What antibiotic is given in single dose or 2 or 3 doses?
Gentimician.