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