Anti-Infective Drugs Flashcards
Anti-infective agent: Any drug/agent effective against some type of pathogens; umbrella term
All have Sim Goal: Reduce population/amount of invading organisms to allow immune response to eliminate rest - why infections problematic in immunocompromised: anti-infectives aid to own immune sys so if not properly working drugs to treat organisms not as effective so is prob for these pats and want them to avoid infections in first place because drugs only help so much; reduce amount invading organism
Anti-infectives overview
Immune compromised problematic
All have Sim Goal: Reduce population/amount of invading organisms to allow immune response to eliminate rest - why infections problematic in immunocompromised: anti-infectives aid to own immune sys so if not properly working drugs to treat organisms not as effective so is prob for these pats and want them to avoid infections in first place because drugs only help so much; reduce amount invading organism
Drugs cause toxicity due to client status
Immune system cannot fight remaining pathogens
Immune compromised problematic
Occurs with any anti-infectives
Develops through mutation from organ - resistance occurs; when things mutate treatments not helpful or fight as well as once did - problematic because might run out of treatment options; prevention of resistance imp
Accelerated by/occur by sev diff things:
Prevention
Lot resistance already occurring - prob if new ones not created to fight infections
Anti-infective resistance
Inappropriate prescribing (e.g., antibiotic for virus) - taking med for something not have so allows for more resistance of organism
Ineffective dosing - not prescribe long-enough duration to adequately kill bacteria; if happens that gives bacterium more opportunity to mutate and change (sees antibiotic but not killed all way and learns how to evade it)
Widespread use - using lot anti-infectives in lot diff pops; overusing it in diff pops and more used more likely evade treatment options and get around them
Accelerated by/occur by sev diff things:
Appropriate prescribing - imp for HCP be educated on best anti-infective for organism grown
Adequate dosing (maintain therapeutic level) - makes sure organism effectively erradicated
Patient education: vital educate take prescription as prescribed; complete entire prescription; vital that educate patients on this; take for entire duration regardless if feel better/symps away; if end too early allows come back and more risk for resistance and mutation; do not share meds with others
Prevention
Goal: Cause bacterial cell death without causing damage to host cells - hard; kill bacteria without causing probs to other host cells; will have some AE as a result
Treat bacterial infections
Mechanism of Action (MOA)
Big concept: All antibiotics cause cell death of bacteria if effective
Antibiotics
Interfere with biosynthesis of pathogen cell wall (penicillin)
Prevent pathogen growth and reproduction division (sulfonamides)
Interfere with steps involved in protein synthesis (aminoglycosides)
Interfere with DNA synthesis in cell (fluoroquinolones)
Alter permeability of cell membrane - leak essentials (antifungal, antiprotozoal, and some antibiotics)
Mechanism of Action (MOA) - antibiotics
Effective for a wide variety of bacteria
Treat wide variety of bacteria
Based on best guess; used first in treatment - cover lot diff types organisms; not know what causing certain thing give these and feel confident start kill off some organism
Used in sepsis protocol - really sick because infections in bloodstream and need take action quickly; get cultures and once come back change course treatment based on organisms growing - where narrow-spectrum antibiotics come into play
Broad-spectrum antibiotics
Selective group of bacteria
Based on results of C&S - see which antibiotics bacteria sensitive to
Better in that help decrease resistance - not using something that treats number things
Narrow-spectrum antibiotics
Two or more drugs intitially and as infections improve d/c antibitoics over time depending on pat
May need multiple antibiotics
Combination therapy
Identify pathogen
Drug (antibiotic) most effective against pathogen involved - C&S (diff ways to get - to determine which drug most effective)
Drug that will cause least AE/complications for client
Consider patient allergy profile - past history; allergies? Comorbidities - sig renal disease - need ones less toxic
HCP considers factors:
GI effects
Skin effects
Hypersensitivity reactions - allergic rxns
Superinfections/secondary infections
Antibiotics: Common Adverse Effects
Nausea, vomiting, diarrhea (n/v/d) - pretty common on some degree for lot pats; monitor pat for these and decide severity
GI effects (Antibiotics: Common Adverse Effects)
Developing a Rash, hives (hypersensitivity rxn); monitor for both of these
Skin effects (Antibiotics: Common Adverse Effects)
Most commonly occur with very first dose; sometimes also during second dose; first and second dose most crucial for monitoring for severe rxn - but can happen at any time; taken many times risk for rxn much lower; first time watch closer
May be immediate, with next exposure, or delayed allergic (48+ hours out)
Severe cases, anaphylaxis can occur
Cross-sensitivity between classifications of antibiotics (e.g., penicillins & cephalosporins) possible - 2 diff classes and if allergic to 1 likely allergic to other higher; 10% not okay but imp know - imp to monitor closely esp if never taken
Determine what client experienced - true allergy or expected adverse effect - assess rxn; imp have correct: want make sure have availability as many antibiotics classifications as possible to treat appropriately
Hypersensitivity reactions - allergic rxns (Antibiotics: Common Adverse Effects)
EX: C. diff, yeast infections
Superinfections/secondary infections (Antibiotics: Common Adverse Effects)
Cause:
Clinical manifestations vary:
Examples:
superinfections/secondary infections
Occur because Host flora suppressed by antibiotics; Pathogenic microorganisms multiply
More likely occur with certain antibiotics than others
Opportunistic—suppressed immune system - immunocompressed more higher risk
Cause: (superinfections/secondary infections)
Diarrhea/cramping, painful urination, abnormal vaginal discharge, rash…
Clinical manifestations vary:(superinfections/secondary infections)
Clostridium difficile (C. diff) overgrowth
Candida albicans (oral or vaginal yeast)
C.diff and yeast infections more common/imp monitor for
Examples: (superinfections/secondary infections)
Toxicities more likely occur with IV because more potent; if on multiple IV antibiotics risk increases; order toxicities most to least prevalent
Acute kidney injury
Neurotoxicity
Liver toxicity
Potential toxicities with antibiotics (order of probability)
Most likely suffer from renal toxicity; when on IV antibiotics look at creatinine and BUN on reg basis to make sure kidney func not declining; not showing kidney injury; monitor urine output closely
CM: Decrease urine output, protein in urine, elevated creatinine and BUN; decreased GFR
Prevention renal toxicity: adequate hydration; do that: diluting antibiotic; not effecting the effectiveness of antibiotic - helps dilute it out; not as toxic on kidneys or hard renal tubules - may give IV fluids; outpat - stay adequately hydrated
Acute kidney injury
More likely occur for IV antibiotics
Nothing to prevent this
CM: headache, dizziness, confusion, seizures, loss of hearing (ototoxicity), vision damage
Neurotoxicity