Antibiotics Flashcards
MRSA
Methicillin Resistant Staphylococcus Aereus
VRE
Vancomycin Resistant Enterococcus
ESBL
Extended-Spectrum Beta-lactamases
KPC
Klebsiella Pnuemonia Carbapenemase
trough 1 hr before dose
peak 1 hr after dose
Vancomycin
Temp above 101 degrees or 38 degrees C with chills and malaise are indicators of a systemic infection
-fever may occur without infection
-Infection can be present without fever
-Older adults whose baseline temp is 1-2 degrees lower, may have a fever at 98.6/37
-Hyperthermia is normal immune response that can help destroy the pathogen.
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Infection
Acetaminophen and Ibuprofen are common.
- These drugs mask fever and make monitoring the course of the illness difficult
- Give if uncomfortable or if fever presents risk (102/38.9)
- heart failure, febrile seizures or head injury.
- Side effects; sweating, drop in BP, return of fever.
- Increase fluid intake and regularly schedule meds.
Anti-pyretics for infection
Cover patient with sheet only. Tepid sponge bath Encourage PO fluids/IV fluids *hyperdynamic state-dehydrate only *monitor for decrease skin turgor, dry mucous membranes, confusion, and increased thirst. Hypothermia blanket; monitor closely *shivering increases temp *setting of blanket? -No fans; disperse airborne/droplet pathogens
Fever Treatment/infection
Risk for social isolation
- The pathogen, not the patient, requires precaution!
- Explain disease/transmission/treatment plan
- Precautions in the home
- Wear gloves when changing dressing
- Wash soiled clothing with disinfectant/bleach
- Complete entire course of antimicrobial drug therapy
- When to call the Dr.
- use another form of birth control when using ABX
Health teaching for infection
- Inhibit cell wall synthesis
- inhibit protein synthesis
- disrupt cell membranes (alter membrane permeability)
- interfere with nucleic acid synthesis/cellular metabolism
- prevent synthesis of folic acid (need folic acid to replicate and grow)
5 Major Mechanisms of activity of Antimicrobials
Bacteriostatic
*antimicrobial drug inhibits the growth of the organism
*leaves host immune system to destroy it
Examples: Tetracyclines, erythromycin
Bactericidal
*antimicrobial drug directly kills the organism
*Immune system is not involved
Examples: Penicillins, cephalosporins aminoglycosides
Antimicrobial drugs classifications
- Microbial resistance; MDRO’s
- Identification of causative organism
- Site of infection
- Interaction with other drugs
- clinical status and behavior of the patient
- Pharmacological properties of the drug
- Superinfections
- Vaginal yeast infection
- Pseudomembraneous colitis, Clostridium Difficile
Factors that affect the Outcome of Antimicrobial Therapy
Assess drug allergies; renal, liver and cardiac function, and other labs.
- Obtain thorough patient health history, including immune status
- Assess for conditions that may be contraindications or indicate cautious use.
- G6PD Deficiency; (glucose-6-phosphate dehydrogenase)-may cause hemolysis
- Slow Acetylation; metabolize some drugs slowly
- Assess for potential food and drug interactions.
- Instruct patients to take abx exactly as prescribed and for the length of time prescribed; they should not stop taking the medication early when they feel better.
- Assess for s/s of superinfection: fever, perineal itching, cough, lethargy, or any unusual discharge.
- Ea. class of Abx has specific adverse effects & drug interactions that must be carefully assessed and monitored.
- The most common Adverse effects of ABX:
- nausea
- vomiting
- diarrhea
- All oral Abx are absorbed better if taken with at least 6 to 8 oz. of h2o.
- If on birth control use back up method.
Nursing Implications:
What to know before giving ABX’s??
Empiric therapy:
- Get cultures if possible prior to med delivery
- Usually broad spectrum ATB; Use EVB to determine which drug to start first.
Pharmacology Overview:
Empiric therapy
Definitive therapy:
*Tailored to results of cultures; specific drug.
Pharmacology Overview:
Definitive therapy
Prophylactic therapy:
- Preventative infection
- National Performance Improvement Project
- SCIP Surgical Care Improvement Project
- Administration of ABX 30 mins prior to surgical incision.
Pharmacology Overview:
Prophylactic Therapy
- Broad class of AB four subclasses: penicillins, cephalosporins, carbapenems and monobactams.
- Named because of beta-lactam ring that is part of chemical structure
- Subclasses share common structure and mechanism of action-they inhibit synthesis of bacterial peptidoglycan cell wall
- Bacterial strains produce the enzyme beta-lactamas
- provides a mechanism of bacterial resistance to antibiotics and breaks down Carbon & Nitrogen in structure of beta-lactam ring
- all beta-lactam drugs then lose antibacterial efficacy so beta-lactamase inhibitors are added to several penicillins abx to make the drug more powerful against Beta-lactamase producing strains.
beta-lactam antibiotic
Natural Penicillin; only ones in clinical use
- penicillin G; inj, IV
- penicillin V; PO (tab, liquid)
Penicillin:
Natural Penicillin
Penicillinase; resistant drugs; stable against hydrolysis by most staphylococcal penicillinase
- cloxacillin
- dicloxacillin
- nafcillin
- oxacillin
Penicillin:
Penicillinase
Aminopenicillin; work better on gram (-) bacteria;
- amoxicillin
- ampicillin
Penicillin:
Aminopenicillin
Extended spectrum drugs; wider spectrum, gram (+), gram (-), anerobic. Used to treat hospital acquired infections like pneumonia and sepsis.
- piperacillin
- ticeracillin
- carbenicillin
- piperacillin/tazobactam
Penicillin:
Extended spectrum drugs
Action: Inhibits bacteria cell wall synthesis. Able to penetrate cell wall to breakdown the cell.
Use: Prevention and treatment of gram (+) bugs.
ie. *streptococcus
*enterococcus
*staphylococcus
Note; little if any ability to kill gram (-)/not all penicillin meds end in -cillin
Adverse Effects: urticarial (hives) Pruitus (itching) Angioedema Steven Johnson's syndrome Severe reaction with IM or IV
Drug Interactions:
- Warfarin-decrease Vitamin K, enhanced anticoagulant effects.
- methotrexate-decreased renal elimination of methotrexate, increasing levels in blood.
- NSAIDS; competes for protein binding, possible toxicity levels.
- Oral contraceptives-decreases effectiveness
Route: PO, IM, IV
Duration of action: 4 to 8 hours depending on route
Dose-dependent on weight and route
Penicillin
- Carbapenems*
- must be infused over 60 mins
- used for UTI, intra-abdominal bacterial infections, pneumonia, pelvic infections, pyelonephritis
- unlike many of the penicillins and cephalosporins, imipenem/Cilastatin is very resistant to antibiotic-inhibiting actions of betalactamases.
ie. Imipenem-Cilastatin (primaxin)
Carbapenems
**Therapeutic class: Anti-infectives
**Pharm class: carbapenems
**Action: binds to penicillin-binding proteins against bacteria. Used against gram pos and neg aerobic and anaerobic bacteria.
**Route/frequency/dose: IV 250-500 mg q 6-8hr. IM 500-750 mg q12
**Side effects: seizures, diarrhea, nausea, vomiting, rash, pseudomembranous colitis
**Contraindications: Cross-sensitivity may occur with penicillins and cephalosporins. Use cautiously in renal impairment, older patients, patients pregnant or breast feeding.
**Nursing Implications: Labs; BUN, AST, ALT, LDH, serum alkaline phosphatase, bilirubin, and Creatinine may be transiently increased.
-H & H concentrations may be decreased.
-Assess patient for infection (VS, appearance of wound, sputum, urine, and stool; WBC) at beginning of and throughout therapy.
Obtain a hx before initiating therapy to determine previous use of and reactions to penicillins. Persons with a neg. hx of penicillin sensitivity may still have an allergic reaction.
-Obtain specimen of cultures and sensitivity before initiating therapy. First dose may be given before receiving results
Carbapenems
Therap. class; anti-infectives
Pharm class: carbapenems
Action: only Carbapenem used to treat against bacterial meningitis. Somewhat less active against gram pos and more active against gram neg, equally with p. aeruginosa. Binds to bacterial cell wall, resulting in cell death. Meropenem resists the actions of many enzymes that degrade most other penicillins and penicillin-like anti-infectives.
Meropenem (merrem)
Route IV
Rapid onset
end of infusion 8hr duration
**Side effects: Seizures, apnea, pseudomembranous colitis, diarrhea, glossitis, (increase in children), nausea, thrush (increase in children), vomiting
**Contraindications: Use cautiously in renal impairment, older patients, patients pregnant or breast feeding
**nursing Implications: Assess for infection, (VS, appearance of wound, sputum, urine and stool; WBC) at beginning of and throughout therapy. Obtain a hx before initiating therapy to determine previous use of and reactions to penicillins. Persons with a negative hx of penicillin sensitivity may still have an allergic response.
-Obtain specimens for culture and sensitivity prior to initiation therapy.
-First dose my be given before receiving results. observe for signs of anaphylaxis!
-Assess injection site for phlebitis, pain and swelling periodically during administration.
-Labs to consider: Monitor hematologic, hepatic, and renal functions periodically. BUN, AST, ALT, LDH, serum alkaline phosphatase, bilirubin, and creatinine. (increase)
H & H concentrations may be decreased.
Meropenem (merrem)
- Aminoglycosides should be taken exactly as prescribed with adequate hydration.
- Encourage fluid intake up to 3000ml/daily
- Report changes in hearing, tinnitus
- Report persistent nausea, vomiting and vertigo
Patient Teaching
Aminoglycosides
- Nephrotoxicity
2. Ototoxicity
Side effects of Aminoglycosides
- Renal function during therapy
- BUN and creatinine
- Perform baseline hearing test
- Assess vestibular function test
Assess; Aminoglycosides
Shorter duration of action 8-12 hrs.
Used for Gentamycin or neomycin resistance.
Amikacin (Aminoglycosides)