Chapter 12 Flashcards
What is an infection?
caused by microorganisms
Symptoms of infection
fever, elevated white blood cell count, high pulse, high respiratory rate
5 things needed to transmit an infection
reservoir, susceptible victim, portal of exit, mode of transmission, portal of entry
Difference between gram-positive and gram-negative
gram-positive has a thick layer of peptidoglycan while gram-negative has a thin layer
Example of gram-positive
streptococcus and staphylococcus
Example of gram-negative
E.coli
What is the difference between bactericidal and bacteriostatic?
bactericidal - bacteria killing
bacteriostatic - bacteria growth inhibiting
Considerations for antibiotic selection
disease location, severity, microorganism, patient allergies, renal or hepatic function, pharmokinectics, pharmacodynamics, local resistance patterns
Penicillin Examples
amoxicillin and piperacillin
Penicillin mechanism of action
interfere with the synthesis of peptidoglycan
Penicillin cidal or static
both
Penicillin major adverse effects
hypersensitivity, rash, diarrhea
Penicillin contraindications
allergy and dosage adjustments in renal disease
Cephalosporins examples
cefazolin, cefoxitin, cefdinir
Cephalosporins mechanism of action
inhibits peptidoglycan
Cephalosporins cidal or static
cidal
Sulfonamides examples
TMP/SMZ
Sulfonamides mechanism of action
inhibit bacterial folic acid synthesis
Sulfonamides cidal or static
static
Sulfonamides major adverse effects
diarrhea, sun sensitivity, kidney stones
Sulfonamides contraindications
hypersensitivity, pregnancy, interacts with warfarin
Aminoglycosides examples
gentamicin
Aminoglycosides mechanism of action
disrupts bacterial protein synthesis
Aminoglycosides cidal or static
cidal
Aminoglycosides major adverse effects
ototoxicity, nephrotoxicity, requires careful blood level monitoring
Aminoglycosides contraindications
pregnancy
Macrolides examples
azithromycin or clarithromycin
Macrolides mechanism of action
inhibit bacterial protein synthesis
Macrolides cidal or static
static at lower doses and cidal at higher doses
Macrolides major adverse effects
GI - nausea, vomiting, diarrhea
Macrolides contraindications
hypersensitivity
Fluoroquinolones examples
ciprofloxacin or levofloxacin
Fluoroquinolones mechanism of action
interferes with bacterial DNA synthesis
Fluoroquinolones cidal or static
cidal
Fluoroquinolones major adverse effects
GI - N/V/D, skin rash, photosensitivity, nephrotoxicity
Fluoroquinolones contraindications
children <18 years old, pregnancy
Tetracyclines examples
doxycycline or minocycline
Tetracyclines mechanism of action
prevents bacterial protein synthesis
Tetracyclines cidal or static
static
Tetracyclines major adverse effects
GI - N/V/D, photosensitivity, discoloration of teeth in children
Tetracyclines contraindications
hypersensitivity, liver disease, children < 8 years old
Clindamycin mechanism of action
inhibits protein synthesis
Clindamycin cidal or static
static
Clindamycin major adverse effects
GI - N/V/D, colitis
Clindamycin contraindications
hypersensitivity, impaired liver function, newborns
Linezolid mechanism of action
inhibits protein synthesis
Linezolid cidal or static
static
Linezolid major adverse effects
GI - N/V/D, leukopenia
Linezolid contracindication
hypersensitivity, adrenergic drugs, tyramine-containing foods
Vancomycin mechanism of action
suppresses cell wall synthesis
Vancomycin cidal or static
cidal
Vancomycin major adverse effects
ototoxicity, nephrotoxicity, red man’s syndrome
blood level monitoring is required
Difference between four classes of penicillins
natural penicillins - not used
PRP - mostly gram - positive
amino - mostly gram - positive and some negative
ESP - high gram - positive and high gram - negative
1st generation cephalosporins
high gram positive, low gram-negative
2nd generation cephalosporins
high gram positive, low gram negative
3rd generation cephalosporins
low gram-positive. high gram-negative
4th generation cephalosporins
low gram-positive, high gram negative
5th generation cephalosporins
high gram-positive, low gram-negative
Red Man’s Syndrome
is a reaction to the drug vancomycin. Patients typically develop symptoms within 5 or 10 minutes of receiving the drug, and they experience itching and flushing of the face, neck, & torso.
What are the drugs used to treat tuberculosis
isoniazid, rifampin, pyrazinamide, ethambutol
Isoniazid major side effects
insomnia, convulsion, psychoses, fatal hepatitis
Rifampin major side effects
fatigue, drowsiness, headache, dizziness, N/V, skin rashes, renal insufficiency
Pyrazinamide side effects
hepatotoxicity, myalgia, rash
Ethambutol side effects
optic neuritis, N/V, fever, hallucinations, regular eye exams to monitor optic neuritis
Commonly used antivirals
end in -vir