ID I: Background and ABX by Class Flashcards
penicillins, cephalos, carbapenems, AGs, FQs, macrolides, TTCs, SMX/TMP, Nitrofurantoin, Specific Pathogen Tx, Renal Dosing
common CNS/meningitis pathogens
s pneumo
n meningitidis
h influenzae
GBS (kids)
listeria (adults)
common URI pathogens
strep pyogenes
s pneumo
h influenzae
m cat
common lower resp tract infection pathogens
community: s pneumo, h inf, atypicals, enteric GNR
hospital: s aureus (MSSA, MRSA), pseud, acinetobacter baumannii, enteric GNR (including ESBL and MDR), s. pneumo
common endocarditis pathogens
s aureus/MRSA
s epidermidis
streptococci
enterococci
common SSTI pathogens
s aureus
s pyogenes
staph epidermidis
G+/- anaerobes, aerobes
GNR (in T2DM)
common UTI pathogens
e coli
proteus
klebsiella
staph saphrophyticus
enterococci
common bone/joint infection pathogens
s aureus
s epidermidis
streptococci
N. gonorrhoeae
GNR
what are the enteric gram - rods
proteus
e coli
klebsiella
enterobacter
serratia
G+ vs G-
G+ have a thick cell wall and stan dark purple on gram stain from crystal violet
G- have a thin cell wall and stain pink on gram stain from safranin counter stain
atypical pathogens and drugs that cover then
legionella
chlamydia
mycoplasma pnemoniae
mycobacterium
covered by TTC, macrolides, FQs and tigecycline, vibramycin
cultures show G+ cocci in clusters
what pathogen could this be
s aureus (MSSA or MRSA)
cultures show G- cocci
what pathogen could this be
neisseria spp.
cultures show G+ cocci in pairs
what pathogen could this be
strep pneumo
strep spp.
enterococcus (including VRE)
cultures show G+ spores
what pathogen could this be
anaerobes
peptostreptococcus
c diff
clostridium spp.
cultures show G- coccobacilli
what pathogen could this be
acineobacter baumannii
bordatella pertussis
moraxella cat.
cultures show G- rods (GNR)
what pathogen could this be
colonize gut = proteus mirabilis, e coli, klebsiella, serratia, enterobacter, citrobacter
curved or spiral GNR = h pylori, campylobacter spp, treponema spp.
do not colonize gut = pseud, h influenzae, providencia
what GNR do not colonize the gut
pseud, h influenzae, providencia
If a pathogen in + for ESBL, what does this mean and what are not treatment options? What are tx options?
pathogen has extended spectrum beta lactamases which makes all penicillins and most cephalosporins ineffective
tx options: carbapenems, ceftazidime/avibactam, ceftolozane/tazobactam
what are the commonly resistant bugs
SPEEAK
s aureus (MRSA)
pseug aeruginosa
e coli (ESBL, CRE)
e. faecalis, e. faccium (VRE)
acinetobacter baumannii
klebsiella (ESBL, CRE)
which abx has a BBW for c diff
clindamycin
which abx are hydrophilic and which are lipophilic? How does this affect the drug?
hydrophilic: B lactams, AGs, vanco, dapto, polymixins
inc hydrophilicity –> dec Vd –> renal elim and tox–> dec cell penetration and low F–> IV:PO not 1:1 and low activity against atypicals
lipophilic: TTC, macrolides, FQs, rifampin, linezolid
inc lipophilicity –> inc Vd –> inc cell penetration –> activity against atypicals and more 1:1 IV:PO ratios and hepatic elim
what does concentration dependent dosing mean? Which drugs use this?
goal is to have a high Cmax to inc killing while having a low trough to dec toxicity (large dose, long interval)
AGs, FQs, dapto
what does exposure-dependent dosing mean? Which drugs use this?
AUC:MIC is used to assess exposure over time in TDM
vanco, macrolides, TTC, polymixins
what does time>MIC dependent dosing mean? Which drugs use this?
goal is to maintain drug level>MIC for most of interval; uses
shorter dosing interval or extended/continuous dosing
B-lactams (penicillins, cephalosporins, carbapenems)