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Antibiotic Prescribing dr shabeel pn www.hi-dentfinishingschool.blogspot.com
The Antibiotic Resistance Spiral Adapted from: J. Carlet. resistance RESISTANCE CONCERN SELECTION BROAD-SPECTRUM EMPIRIC THERAPY cross- transmission dosage duration new antibiotics (promotion from pharmaceutical industry)
Today’s presentation ,[object Object],[object Object],[object Object],[object Object],[object Object]
AIR Program - JHH ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Restricted Anti-infectives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
 
“ Other ” – Don’t put “registrar wants it!”
Write number on medication chart
Restricted antibiotic indications ,[object Object],[object Object],[object Object]
 
 
Ceftriaxone ,[object Object],[object Object],[object Object]
Aminoglycosides Gentamicin Tobramycin Amikacin
Aminoglycosides ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dosing ,[object Object],[object Object],[object Object],[object Object],[object Object],Doses should be based on  ideal body weight  in obese patients Starting doses generally safe even in renal impairment 2mg/kg/single dose Surgical prophylaxis 7mg/kg/day Septic shock Pseudomonas aeruginosa sepsis 5mg/kg/day Intra-abdominal sepsis, urosepsis, severe pneumonia, neutropenia Starting dose Clinical condition
Once daily dosing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Aminoglycoside action: MIC= minimal inhibitory concentration PAE= post-antibiotic effect PALE= post-antibiotic leucocyte enhancement effect Protects against bacterial regrowth when serum concs fall below MIC Bacteria are more susceptible to intracellular killing or to phagocytosis by leukocytes
Monitoring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dose adjustments ,[object Object],[object Object],= (2.7/5.4) x  5 mg/kg = 2.5 mg/kg Next dose =  (target concentration/actual concentration) x initial dose  2.7mg/L Target concentration, calculated from the midpoint of the two lines  5.4mg/L Actual concentration at 9 hours on day 3 5mg/kg Dose of aminoglycoside
What if the level is sub-therapeutic?? ,[object Object],[object Object],[object Object],[object Object]
Toxicity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cystic Fibrosis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Vancomycin
Vancomycin ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PK and PD ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dosing  (See Therapeutic Guidelines: Antibiotic) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Monitoring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Toxicity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Bacterial Resistance Mechanisms ,[object Object],[object Object],[object Object],[object Object]
mecA Encodes penicillin binding protein 2a with low affinity for beta-lactam antibiotics Cell -wall active antibiotics - Beta-lactams - Glycopeptides (vancomycin)
Emergence of resistance in Staph. and other Gram positive bacteria 1988 – VRE 1996 – VISA 2002 - VRSA 1960 (Pen, streptom, tetrac, eryth) 1946 First Resistance 1965 1959 1942 Introduction Vancomycin Methicillin Penicillin Drug
Vancomycin-resistant Enterococcal types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
VRE epidemiology in Australia ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
CAP/HAP & Surgical Prophylaxis ,[object Object],[object Object]
Surgical Prophylaxis
Any questions?

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Antibiotic Prescribing

  • 1. Antibiotic Prescribing dr shabeel pn www.hi-dentfinishingschool.blogspot.com
  • 2. The Antibiotic Resistance Spiral Adapted from: J. Carlet. resistance RESISTANCE CONCERN SELECTION BROAD-SPECTRUM EMPIRIC THERAPY cross- transmission dosage duration new antibiotics (promotion from pharmaceutical industry)
  • 3.
  • 4.
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  • 6.  
  • 7.  
  • 8. “ Other ” – Don’t put “registrar wants it!”
  • 9. Write number on medication chart
  • 10.
  • 11.  
  • 12.  
  • 13.
  • 15.
  • 16.
  • 17.
  • 18. Aminoglycoside action: MIC= minimal inhibitory concentration PAE= post-antibiotic effect PALE= post-antibiotic leucocyte enhancement effect Protects against bacterial regrowth when serum concs fall below MIC Bacteria are more susceptible to intracellular killing or to phagocytosis by leukocytes
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29.
  • 30.
  • 31. mecA Encodes penicillin binding protein 2a with low affinity for beta-lactam antibiotics Cell -wall active antibiotics - Beta-lactams - Glycopeptides (vancomycin)
  • 32. Emergence of resistance in Staph. and other Gram positive bacteria 1988 – VRE 1996 – VISA 2002 - VRSA 1960 (Pen, streptom, tetrac, eryth) 1946 First Resistance 1965 1959 1942 Introduction Vancomycin Methicillin Penicillin Drug
  • 33.
  • 34.
  • 35.

Editor's Notes

  1. PALE: bacteria in the post-antibiotic phase are more susceptible to intracellular killing or to phagocytosis by leukocytes Sub MIC effects: at this concentration antibiotics are known to slow growth and produce morphological changes. Sub MIC concentrations can also prolong the duration of the PAE PAE: the persistent suppression of bacterial growth following exposure to an antimicrobial
  2. Risk factors: Concurrent use of other nephrotoxic agents Prolonged therapy Continually elevated trough levels
  3. 16