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Treatment of extremely drug resistant
gram-negative organisms
Paul Ananth Tambyah With thanks to
Dr Hsu Li Yang
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An unfortunate young man
• 7 year old boy with AML M2,
finishing chemotherapy in
remission
• Admitted with neutropenic
sepsis
• Stool C.diff toxin positive
• Blood culture positive
• Hickmann removed
• Abdominal pain
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An unfortunate young man
• Developed blisters in groin
• Blood cultures persistently
positive
• Debrided in ICU
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First ESBL SSI - 1992
• “One new strain of Klebsiella spp. which ifrst
appeared in February 1990 which was resistant to
ampicillin, piperacillin, augmentin, unasyn,
aztreonam, co-trimoxazole, amikacin, gentamicin,
cephalexin, cefotaxime, ceftriaxone, cefoperazone
and ceftazidime”
– Esuvaranathan K, Kuan YF, Kumarasinghe G, Bassett
DCJ, Rauff A. J Hosp Infect 1992;21:231-40
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ESBL production in
Gram-negative bacilli causing
Surgical site infections
0
50
100
150
200
250
ESBL producers
Non-producers
Kumarasinghe, Tambyah, Chow, Liew, 1st APSIC 1999
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Singapore
Data
Koh TH
Ann Acad Med Sing
2008;37:847-54
Not just NUH All across Singapore
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High rates in SG, CN, SA
Big regional differences
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A lot of recent Media hype about NDM-1
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Even reached Singapore!
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International dissemination of Klebsiella pneumoniae carbapenemase (KPC)–producing Enterobacteriaceae.
Gupta N et al. Clin Infect Dis. 2011;53:60-67
Published by Oxford University Press on behalf of the Infectious Diseases Society of America 2011.
Its not just NDM-1 but also KPC
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Even in SG
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Know Your Local Bugs
Antibiotics
Gen Ward
(379)
ICU (38)
Blood Cultu
re ( 210)
Gen Ward
(113)
ICU (22)
Gen Ward
(294)ICU
(47)
Blood Cultu
re (148 )
Gen Ward
(229)ICU
( 56)Gen W
ard (55)
ICU (6)
Blood Cultu
re ( 28)
Gen Ward
(15)
ICU (8)
Gen Ward
(75)
ICU (11)
Blood Cultu
re (82)
Gen Ward
(225)
ICU (90)
Gen Ward
(128)
ICU (16)
Blood Cultu
re (49)
Gen Ward
(510)
ICU (91)
Ampicillin 30 26 34 31 23 0 0 1 0 0 33 83 18 40 25 0 0 0 0 0
Amp/sulbactam 39 39 51 38 35 23 11 48 54 36 48100 31 50 57 24 9 37 19 9
Amox/clavulanate 39 39 51 38 23 23 11 48 60 46 48100 31 46 43 0 0 2
Gentamicin 78 71 85 67 62 38 26 65 63 46 44 80 29 50 29 13 9 32 26 18 39 63 59 69 62
Amikacin 93 97 97 90 89 91 89 93 95 92 80100 56 86 86 51 36 51 59 56 42 69 62 74 70
Cephazolin 68 60 22 11 44100 0 0
Cefuroxime 62 60 62 50 20 11 47 24 46100 50 25 0 0 0 0 0
Ceftriaxone 74 71 82 65 59 28 11 54 61 46 87100 68 71 75 0 0 0 0 0
Cefotaxime
Ceftazidime 71 68 80 59 52 25 11 50 58 53 49100 38 43 38 7 9 21 21 19 42 56 55 69 55
Imipenem 100 100 100100100100100 100 100100 40100 33 31 43 7 9 24 25 18 61 85 64 78 67
Meropenem 100 100 100100100 99100 100 100100100100 100 100 100 8 9 24 24 18 56 92 68 79 68
Ciprofloxacin 54 53 69 65 67 24 15 57 62 48 36 80 28 50 57 7 9 35 25 16 38 62 55 69 65
Co-trimoxazole 53 43 54 48 27 32 18 58 61 48 38 80 29 40 29 25 9 28 40 20
Nitrofurantoin 90 89 20 23 0 0 0 0
Aztreonam 89 69 79 60 62 22 7 36 59 57 92 67 84 50 63 1 0 1 16 14 29 38 42 56 38
E coli
Urine Non-Urine
Proteus spp
Urine Non Urine Urine Non Urine
Klebsiella spp
Urine
Acinetobacter spp
Non Urine Urine
Ps aeruginosa
Non Urine
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MDR GNR infx Independent risk fx For increased cost
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MRSA
as well
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ECDC definitions
• MDR
– – not susceptible to three classes of antibiotics that the
organism is usually susceptible to
• XDR
– only susceptible to 1 or 2 classes of antibiotics
• PDR
– resistant to all classes of antibiotics
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Targeted therapy
not empiric therapy
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Inappropriate Antimicrobial Therapy:
Impact on Mortality
Source: Kollef M,et al: Chest 1999;115:462-74
12 Steps to Prevent Antimicrobial Resistance: Hospitalized Adults
Step 3: Target the pathogen
0
100
200
300
400
500
600
Inappropriate Appropriate Therapy Therapy
42.0% mortality
17.7% mortality Relative Risk = 2.37 (95% C.I. 1.83-3.08; p < .001)
# Deaths
# Survivors
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Kollef et al Chest 1999;115:462-474
Inappropriate? Viruses and fungi covered routinely??
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Clin Infect Dis 2007;45:329-37
There are methodological issues
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Impact of inappropriate treatment
RGNB Infection
Impact -Clinical Impact
0.0
00
.25
0.5
00
.75
1.0
0
0 100 200 300Length of stay(days)
Appropriate treatment Inappropriate treatment
Hospital mortality: RGNB infection
Kaplan-Meier survival estimates
0.0
00
.25
0.5
00
.75
1.0
0
0 50 100 150Length of stay(days)
Appropriate treatment Inappropriate treatment
inICU mortality: RGNB infection
Kaplan-Meier survival estimates
P: 0.08 P: 0.77
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De-escalation is risky
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New technologies are critical
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Back to my patient
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Polymyxins now Recommended???
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Experience with polymyxins growing
Kwa et al Ann Acad Med Sing 2008;37:870-3
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Polymyxin Problems
• Nephrotoxicity, neurotoxicity, dermatotoxicity
• Hetero-resistance has emerged as well as
complete resistance
• Efficacy might not be as high
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Outcome among patients with CRAb BSI according to PB treatment
Treated with PB
Not treated
p value
Outcome
Documented microbiological clearance
6/ 7 (85.7%)
10/12 (83.3%)
0.70
All-cause mortality 8/16 (50.0%)
5/10 (50.0%)
0.66
PB: polymyxin B
Chai et al ICAAC 2004
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Carbapenems
• MIC varies: EUCAST vs CLSI
• For sensitive species with low MIC values
• Prolonged infusion time ?
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Ceftazidime Use and Resistance in
Acinetobacter spp
0
10
20
30
40
50
60
0 5 10 15 20 25
%Resistant
Tambyah et al SHEA 2000
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Ciprofloxacin Use and Resistance in
Acinetobacter spp
0
10
20
30
40
50
60
70
0 2 4 6 8 10
%Resistant
Tambyah et al SHEA 2000
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Amikacin Use and Resistance in
Acinetobacter spp
0
10
20
30
40
50
60
012345678
DDD/1000 pt days
% r
esi
sta
nt
Tambyah et al SHEA 2000
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Combination therapy
• Works well for HIV, TB
• Never been adequately studied in GNR infections
in RCTs
• Concerns re: increased toxicity and greater
change in microbial ecology leading to a
paradoxical increase in resistance
Paul Ananth Tambyah
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Does combination therapy work?
Safdar N, Handelsman J, Maki DG. Lancet Infect Dis. 2004;4:519-27.
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Does combination therapy work?
Safdar N, Handelsman J, Maki DG. Lancet Infect Dis. 2004;4:519-27.
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Read the fine print
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MICs are important
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1.More data dissemination 2.Support for Stewardship/Novel technologies 3.Infection Control 4.One health approach
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National
Surveillance
in SG
Hsu LY et al,
Emerg Infect Dis
2007;13:1944-7
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Hsu LY et al, Emerg Infect Dis 2007;13:1944-7
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Correlation not so clear cut
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We have to go outside the hospital
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There are problems locally
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Main issues are economic
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Antimicrobial Stewardship was safe in SG
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It is a bit complex
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It does work
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Ecological impact of antibiotics
0
10
20
30
40
50
60
<7d,no abx <7d, +abx >7d no abx >7d +abx
Ps Aer
Ac Baum
MRSA
Trouillet JL et al. Am J Resp Crit Care Med 1998;157:531-9
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Effect of Hand Hygiene on Resistant
Organisms Year Author Setting Impact on organisms
1982 Maki adult ICU decreased
1984 Massanari adult ICU decreased
1990 Simmons adult ICU no effect
1992 Doebbeling adult ICU decreased with one versus another hand hygiene product
1994 Webster NICU MRSA eliminated
1999 Pittet hospital MRSA decreased ICU = intensive care unit; NICU = neonatal ICU
MRSA = methicillin-resistant Staphylococcus aureus
Link to: Improving hand hygiene
12 Steps to Prevent Antimicrobial Resistance: Hospitalized Adults
Step 12: Break the chain of contagion
Source: Pittet D: Emerg Infect Dis 2001;7:234-240
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Infection Control in a nutshell
Everything I needed to know about infection control,
I learned in kindergarten
– Julie Gerberding, former Director US CDC
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Always clean your hands
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Cover your mouth when you cough
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Don’t go to work when you are sick
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