Infectious Disease Flashcards
amoxicillin coverage
HELPS H.influ E.coli Listeria Proteus Salmonella
amoxicillin best initial tx for:
- otitis media
- dental infection and endocarditis prophylaxis
- lyme disease
- UTI in prego
- listeria
- entercoccal infections
penicillinase resistant pencillins
oxacillin
cloxacillin
dicloxacillin
nafcillin
penicillinase resistant pencillins best intial tx for:
- skin infections
- staph: endocarditis, meningitis, bacteremia
- osteomyelitis and septic arthritis (only when organism proven sensitive)
methicillin ever the right answer
nooooooo
piperacillin, ticarcillin, azclocillin, mezlocillin best initial tx for
- cholecystitis
- ascending cholangitis
- pyelonephritis
- bacteremia
- HAP and VAP
- neutropenia and fever
only cephalosporin that covers MRSA
CEFTAROLINE
rash to pencillin, give….
cephalosporins
anaphylaxis to penicllin, give….
nON-beta lactam
first gen cephs 2 additional
cephadrine
cefadroxyl
first gen cephs for…
- osteomyelitis
- septic arthritis
- cellulitis
- endocarditis
2 second gen cephs which cover anaerobes
cefotetan
cefoxitin
second gen cephs, 3 additional
cefotetan
cefprozil
loracarbef
cefotetan
cefoxitin best initial tx for…
PID + doxycycline
side effects of:
cefotetan
cefoxitin
BLEEDING
DISULFIRAM like reaction
cefurozime, loracarbef, cefprozil, cefaclor tx for
RESPIRATORY infections
- bronchitis
- otitis media
- sinusitis
ceftriaxone first line tx for
- meningitis
- CAP with macrocodes
- gonorrhea
- lyme disease
who to avoid ceftriaxone with…
NEONATES–impairs biliary metabolism
cefotaxime
instead of ceftriaxone in neonates
SBP
cefepime for:
- neutropenia and fever
- VAP
carbapenems for…
- neutropenia and fever
all carbapenems cover…. except….
PSEUDOMONAS, except ERTRAPENEM
morgonella and citrobacter
gram negative bacilli
fluoroquinolones for
- best tx CAP
- cipro- cystitis and pyelonephritis
- diverticulitis and GI infections
what do fluoroquinolones have to be added with for GI infections
METRO
the one fluoroquinolone which can be a single agent in diverticulitis
MOXIFLOXACIN
aminoglycosides
- NO EFFECT ON ANAEROBES
gatifloxacin
REMOVED– because caused GLUCOSE problems
doxycycline used for
- chlamydia
- lyme disease
- rickettsia
- MRSA of skin and soft tissue
- primary and secondary syphilis second line
- borrelia, ehrlichia, mycoplasma
TMP/SMX used for
- cystitis
- pneumocystitis pneumonia both tx and pro
- MRSA cellulitis
first choice for mouth and GI abscess
beta lactam+ beta lactamse – since cover anaerobes
MRSA drugs
- VANCIN: telavancin, dalbavancin, oritavancin
- tedizolid
- vanocmycin
- linezolid
- daptomycin: elevates CPK
- tigecycline
- ceftaroline
minor MRSA skin infections
- TMP/SMX
- clindamycin
- doxy
- linezolid
anaerobes above the diaphragm
- penicillins
- clindamycin
anaerobes below the diaphragm
- metro
- beta lactam/lactamase combinations
general anaerobe coverage
- piperacillin
- carbapenems
- second gen cephalosporins
head CT first in meningitis if….
- papilledema
- seizures
- focal neuro bsnormalities
- confusion interfering with neurological exam
latex agglutination test
similar to gram stain
POSITIVE– very specific
NEGATIVE– chance they could still have it
using protein and glucose levels to guide tx decision
NEVER NEVER too nonspecific
tx meningitis
ceftriaxone, vancomycin, steroids
tx meningitis with listeria
ADD ampicillin
who is at risk for listeria meningitis
- extremes of age: elderly and neonates
- IMMUNOcompromised: steroids/HIV/alcoholic/pregnant
first step for PC encephalitis
head CT first– because of the confusion
most accurate test for herpes encephalitis
PCR of CSF (more beneficial than brain biopsy)
if acyclovir fails in herpes encephalitis….
FOSCARNET
if patients creatinine elevates after tx with acyclovir
REDUCE dose of acyclovir and hydrate
since acyclovir is less nephrotoxic than foscarnet
most sensitive finding for otitis media
IMMOBILE TYMPANIC MEMBRANE
if have a mobile tympanic membrane will EXCLUDE otitis media
multiple recurrent otitis media, next best step….
tympanocentesis
tx of otitis media and sinusitis
- amoxicillin (or oc-amox)
- doxy
- TMP/SMX
most accurate test for sinusitis
sinus biopsy or aspirate
culture nasal discharge for sinusitis?
NOOOOO WRONG WRONG WRONG
biopsy of sinusitis only needed if…
- recurrent
- FAILED response to empiric tx
obvi PC of sinusitis… what next…
TREAT THEM! with co-amox + decongestant
pharyngitis with small vesicles
HSV– anterior pharynx
pharyngitis with ulcers
herpangina– posterior pharynx
anterior palatal petechiae
EBV
best initial test with strep throat
rapid strep test
tx of strep throat
- amoxicillin best initial
- cephalexin if rash allergy
clindamycin or macrolide if anaphylaxis allergy
within 48hrs of influenza symptoms
- oseltamivir
- zanamivir
(shorten the duration of influenza A and B symptoms)
diarrhea with shellfish and cruise ships
vibrio parahaemolyticus
diarrhea with shellfish, LIVER disease, SKIN lesions
vibrio vulnificus
diarrhea with HFE, blood transfusions
yersinia
best initial test for infectious diarrhea
blood and or/fecal leukocytes
what is better in dx of infectious diarrhea
FECAL LACTOFERRIN better than fecal leukocytes
most accurate test for infectious disease
stool culture
no blood or WBC’s in stool
- viral
- giardia
- crypto
- bacillius cereus
- staph
wheezing, flushing, RAPIDLY rash after eating fish
scromboid poisoning
tx of scromboid poisoning
ANTIHISTAMINES
tx mild diarrhea
oral fluid replacement
severe diarrhea
- hypotensive
- tachycardic
- fever
- abdo pain
- bloody diarrhea
- metabolic acidosis
tx of severe diarrhea
fluid replacement and cipro
most accurate finding cause of infectious diarrhea
BLOOD IN STOOL= invasive pathogen
tx of viral, bacillus, staph diarrhea
fluid support as needed
hep C and acute presentation….
RARELY OCCURS
hepE is worst in….
PREGNANCY
rare complication of acute hepatitis
aplastic anaemia
highest likelihood of mortality with hepatitis…
INCREASE PT (Since more likely to go onto hepatic failure)
first serology parameter to be abnormal in hep B
hepB surface antigen
if patient doesn’t have with HepB serology= NO LONGER AT RISK OF TRANSMITTING
hepB surface antigen
(since transmissibility only stops when the DNA polymerase is gone, which can still be there when surface and e antigen antibodies appear)
HepB serology= active viral replication
hepE antigen