Bacterial Infection - Chapter 29 Flashcards
Infectious Disease
Can be:
- Bacterial
- Fungal
- Viral
- Protozoal
- Parasites
The risk for Infectious Diseases is Increased by:
- Poverty
- Malnutrition
- Lack of clean water
- Poor sanitation
- Inadequate housing
Antimicrobial
A drug used to treat a microbial infection
-Microbes include: bacteria, viruses, fungi, and protozoa
Antibiotic
- A naturally occurring substance produced by one organism that is capable of destroying or inhibiting the growth of bacteria.
- May improve the survival of individuals with bacterial infections
Bactericidal vs. Bacteriostatic
- Bactericidal: Kills Bacteria
- Bacteriostatic: Slows the growth of bacteria enough for the immune system to destroy it
Broad Spectrum Antibacterials
Effective against a wide range of bacteria
Microbial Resistance
The ability of bacteria to adapt to overcome or withstand the effects of an antibacterial
Mechanisms of Antibacterial Action:
1) Inhibit Bacterial Cell Wall Synthesis
- Many bacteria have a cell wall and human cells do not.
- Antibacterial agents target the cell wall and damage the bacteria without harming the host
- B-Lactam antibiotics inhibit cell wall synthesis
Mechanisms of Antibacterial Action:
2) Inhibit Bacterial Cell Wall Function
-Antibiotic produces a detergent-like action that increases cell membrane permeability and causes essential cell contents to leak out.
Mechanisms of Antibacterial Action:
3) Inhibit Protein Synthesis
Antibacterial agents interfere with the bacteria’s ability to replicate
-eg.) aminoglycosides, macrolides, tetracyclines, and oxazolidinones
Mechanisms of Antibacterial Action:
4) Inhibit Bacterial DNA and RNA Synthesis
Blocks bacteria’s ability to replicate and spread
Mechanisms of Antibacterial Action:
5) Antifolates
- Folic acid is needed for bacterial synthesis of DNA
- Antifolate agents and dihydrofolate reductase inhibitors block the bacterial synthesis of folic acid.
Classification of Antibacterials
- Aminoglycosides
- Penicillins
- Cephalosporins
- Fluoroquinolones
- Macrolides
- Oxazolidinones
- Carbapenems
- Sulfonamides
- Tetracyclines
- Misc.
Aminoglycosides
-Common ending: “mycin” (but other antibiotics can end this way)
USE:
-Reserved for serious infections
-Topical treatment of blepharitis, conjunctivitis, and minor skin infections
-Bowel sterilization prior to bowel surgery
-Use is linked to hearing loss (Ototoxicity) and kidney damage (Nephrotoxicity)
Generic: gentamicin
Cidomycin
-aminoglycoside
Generic: neomycin
Neomycin
-aminoglycoside
Generic: streptomycin
Streptomycin
-aminoglycoside
Generic: tobramycin
Tobi, Tobrex
-aminoglycoside
Penicillins
- Common ending: “cillin.”
- inhibit bacterial cell wall synthesis
Generic: penicillin G benzathine
Bicillin LA
-im
-Penicillin
Warning Labels: REFRIGERATE; DO NOT FREEZE
Generic: penicillin V
Penicillin V
-tablets or suspension
-penicillin
Generic: cloxacillin
Cloxacillin
-capsules or suspension
-Penicillin
Warning Labels: TAKE ON EMPTY STOMACH
Generic: ampicillin
Ampicillin
-capsules, iv, or suspension
-Penicillin
Warning Labels: TAKE ON EMPTY STOMACH
Generic: piperacillin
Piperacillin
-iv
-Penicillin
Generic: amoxicillin
Amoxicillin
-capsules, chewable tablets, suspension
-penicillin
Generic: amoxicillin/clavulanate
Clavulin
-tabs or suspension
-Penicillin
Warning Labels: TAKE WITH FOOD
Generic: piperacillin/tazobactam
piperacillin/tazobactam
-iv
-Penicillin
Penicillin ADR’s
- Nausea and vomiting (minor)
- Diahrrea
- Yeast infection (women)
Penicillin Warning Labels
- COMPLETE FULL COURSE OF THERAPY
- MAY DECREASE EFFECTIVENESS OF ORAL CONTRACEPTIVES
Cephalosporins
- Common beginning: “ceph” or “cef”
- B-Lactam ring structure
- Inhibit the third and final stage of bacterial wall synthesis
- May be classified as first, second, third, or fourth generation
First Generation Cephalosporins
- Most effective against gram (+), aerobic bacteria
- Used for treatment of staphylococcal and streptococcal infections of the skin and soft tissue
- cefazolin
- cefadroxil
- cephalexin
Second Generation Cephalosporins
- Effective against gram (+) and gram (-) bacteria
- Used for treatment of upper respiratory infections
- cefprozil
- cefoxitin
- cefuroxime
Third Generation Cephalosporins
- Most effective against gram (-), anaerobic bacteria
- Used for treatment of bacterial meningitis, gonorrhea, intra-abdominal infections, and bone and joint infections
- cefotaxime
- ceftazidime
- ceftriaxone
- cefixime
Fourth Generation Cephalosporins
- Used for treatment of multidrug resistant infections or severe hospital acquired pneumonia
- cefepime
Generic: cefazolin
cefazolin
-First generation cephalosporin
Generic: cefadroxil
cefadroxil
- first generation cephalosporin
- Warning Labels: TAKE WITH FOOD
Generic: cephalexin
Keflex
- First generation cephalosporin
- Warning Labels: REFRIGERATE. SHAKE WELL AND DISCARD AFTER 14 DAYS
Generic: cefprozil
Cefzil
- second generation cephalosporin
- Warning Labels: REFRIGERATE. SHAKE WELL AND DISCARD AFTER 14 DAYS
Generic: cefoxitin
cefoxitin
-Second generation cephalosporin
Generic: cefuroxime
Ceftin
-Second generation cephalosporin
- Warning Labels: TAKE WITH FOOD
- REFIGERATE, SHAKE WELL AND DISCARD AFTER 10 DAYS