changing epidemiology of bacteraemia in infants aged 1 week to 3months mekhala ayya sch journal club...
TRANSCRIPT
![Page 1: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/1.jpg)
Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months
Mekhala Ayya SCH Journal Club 3rd April 2014
TL Greenhow, Yun-Yi Hung, Arnd M Herz
![Page 2: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/2.jpg)
Aims
• To determine if GBS is still one of the main causes of neonatal infection
• To identify other pathogens that can cause neonatal infection
![Page 3: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/3.jpg)
Objectives
• Select an appropriate paper from the literature• Discuss the paper’s methodology and findings• Look at what this paper adds to our knowledge• Should we change our practice?
![Page 4: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/4.jpg)
Case
• 11 day old baby • Born at Term ( 40+4)• Birth weight of 3.65kg • Not gaining weight • Good oral intake but mum felt that he was generally
more grizzly than usual ( for 3 days)• Non Specific symptoms • CRP> 200 • Received full septic screen, blood cultures negative
![Page 5: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/5.jpg)
The Clinical Question
![Page 6: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/6.jpg)
Literature Search
• Late onset neonatal sepsis• Bacteraemia • Septic screen
• Limited search to Neonates and Infant aged < 23 3months
• Searched Medline, EMBASE and Trip Database• Limited to English Language
![Page 7: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/7.jpg)
Search Results and Article Selection
• Multiple articles – mainly regarding the management and diagnostic techniques in infants < 3mths with suspected infection
• Article selected as:– Most recent– From presentation– In keeping with my case and clinical question regarding
pathogens
![Page 8: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/8.jpg)
Current Practice
• In infants < 3 mths • Clinical suspicion of infection • Low threshold for performing a full septic screen
![Page 9: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/9.jpg)
Methodology
• Cohort Study• Retrospective identification of positive blood culture in
infants ages between 1 week to < 3mths of age• Full Term infants ( >37 weeks gestation)• January 1st 2005 – December 31st 2009• Diagnosis of bacteraemia ( likely pathogen)
![Page 10: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/10.jpg)
Methodology Continued
• Review of computerised medical records database • Contained all blood cultures results of infants ( 1 week-
3mths ) born in study period• Term infants > 37 week gestation • Baseline characteristics of infants and mothers available• Exclusions:• those infants with underlying medical conditions• Duplicated blood cultures performed within 3 days and
not identifying a new pathogen
![Page 11: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/11.jpg)
• Identified all positive blood cultures • Samples collected from OPD, ED and in patient setting• Positive blood cultures classified as “likely contaminant”
and “potential pathogen”• Excluding all blood cutlures from infants with underlying
medical conditions • Excluded duplicates results from within 3 days of positive
result• Urine and CSF analysis included if performed within 2
days of blood culture acquisition (only positive results)
Event Title If Required (Change Text in Footer)
![Page 12: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/12.jpg)
Outcomes
• Common pathogens in study period attributing to infant infection with a positive blood culture
• E.Coli, GBS and Staph Aureus
• Overall Incidence of bacteraemia in infants ( 92/160,818 or 0.57 per 1000 full term births)
• E. Coli sepsis – more evenly spread incidence through 3 mhs
• GBS – greater incidence initially • Incidence rates compared by age, sex, race
![Page 13: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/13.jpg)
Outcomes Continued• No cases of Listeria or Neisseria recorded • Only infants with E.Coli, GBS or Strep Pneum
bacteraemia had concomitant meningitis
Event Title If Required (Change Text in Footer)
![Page 14: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/14.jpg)
![Page 15: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/15.jpg)
![Page 16: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/16.jpg)
![Page 17: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/17.jpg)
Are the results of the study valid?
1. Did the study address a clearly focused issue?
Yes
Cleary defined population
Outcomes clear
2. Did the authors use an appropriate method to answer their question?
Yes
Cohort study was an appropriate study
![Page 18: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/18.jpg)
Detailed Questions
3. Was the cohort recruited in an acceptable way?
Yes
4. Was the exposure accurately measured to minimise bias?
Yes
![Page 19: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/19.jpg)
Detailed questions continued
5. Was the outcome accurately measured to minimise bias?Can’t TellObjective measurement (+/-)Excluded some positive blood cultures ( ie. CONS) which may affected end result
6. A. Have the authors identified all important confounding factors? Yes
7. B. Have they taken account of the confounding factors in the design and/or analysis?
YesComorbidity and illness severity considered, age/gender/time
of presentation not found to influence outcome
![Page 20: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/20.jpg)
Detailed questions continued
7. A. Was the follow up of subjects complete enough?
Unclear
6. B. Was the follow up of subjects long enough? Unclear
To answer their outcomes follow-up adequate
Longer term morbidity not considered- especially those with bacteraemia, UTI and meningitis
![Page 21: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/21.jpg)
• 8. What are the results of the study?E.Coli bacteraemia > GBS in this study
Infants with E.Coli bacteraemia had higher WCC than controls
9. How precise are the results?
IQR provided
Overall incidence clearly provided
Generally precise
Event Title If Required (Change Text in Footer)
![Page 22: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/22.jpg)
Results questions
10. Do you believe the results?
Yes
11. Can the results be applied locally?
Yes
Very similar population to that of study
12. Do the results of the study fit with other available evidence?
Yes
![Page 23: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/23.jpg)
Will the results help us at SCH?
What are the implications for further practice?
1)Given the low incidence of bacteraemia in this study, is it possible that we use observation as a tool before we do a full septic workup for infants <3mths
1)Do we need to be more proactive with identifying E.Coli as we are with GBS?
![Page 24: Changing Epidemiology of Bacteraemia in Infants aged 1 week to 3months Mekhala Ayya SCH Journal Club 3 rd April 2014 TL Greenhow, Yun-Yi Hung, Arnd M Herz](https://reader035.vdocuments.site/reader035/viewer/2022081603/56649f285503460f94c40334/html5/thumbnails/24.jpg)
Summary and Conclusions
• GBS isn’t the only organism worth considering when seeing infants < 3 mths with possible infection
• Overall incidence of bacteraemia in this study is low.