Amaç:
Acineobacter
baumannii (A.
baumannii) suşları pekçok antibiyotik grubuna karşı direnç geliştirebilen
nozokomiyal infeksiyon etkenleridir. A. baumannii
suşlarında karbapenem grubu anibiyotiklere karşı direnç mekanizmalarından
birisi de meallo-beta-laktamaz enzimi üretimidir. Metallo-beta-laktamaz enzimleri (VIM, IMP
vb.) aztreonam dışındaki tüm beta-laktamazları inhibe eden, çinko iyonuna
gereksinim duyan enzimlerdir. Bu
çalışmanın amacı, karbapeneme dirençli A.
baumannni suşlarında metallo-beta-laktamaz varlığının iki farklı fenoipik yöntemle araştırılmasıdır.
Gereç
ve Yöntem: Çalışmaya çeşitli klinik örnekleden
izole edilen karbapeneme dirençli 82 A. baumannii
suşu dahil edildi. Bakteri identifikasyonu konvansiyonel yönemler ve BD Phoenix
(Becton Dickinson, USA) otomatize sistemi ile gerçekleştirildi. Antibiyotik
duyarlılık testleri EUCAST önerileri doğrulusunda disk difüzyon yöntemiyle
belirlendi. MBL varlığı kombine disk yöntemi ve modifiye Hodge testi ile araştırıldı.
Bulgular:
Karbepeneme dirençli 82 A. baumannii
suşunun 3’ünde (% 3.7), kombine disk yöntemiyle MBL enzimi saptanırken,
Modifiye Hodge testi çalışılan 70 A. baumannii
suşunun 27 (%39)’sinde MBL üretimi saptandı.
Sonuç: Hastanemizde karbapeneme dirençli A.baumannii suşlarında kombine disk
yöntemiyle MBL enzimi pozitifliği düşük oranda saptanırken, modifiye Hodge
testi ile yüksek oranda saptanmıştır. İki yöntem arasında korelasyon
saptanmamıştır. Sonuç olarak, MBL enzim varlığının referans
yöntem olan moleküler yöntemlerle belirlenerek iki fenotipik yöntemden
hangisinin daha uygun olduğunun belirlenmesi uygun bir yaklaşım olacaktır.
Aim:
Acinobacter baumannii strains are nosocomial infections that can develop
resistance to many antibiotic strains. One of the mechanisms of resistance of
the carbapenem group to anobiotics in A.baumannii strains is the production of
meallo-beta-lactamase enzyme. Metallo-beta-lactamase enzymes (VIM, IMP, etc.)
are enzymes that inhibit all beta- lactamases outside of aztreonam and require
zinc ions. The aim of this study is to investigate the presence of
metallo-beta-lactamase in carbapenem resistant A. baumannii strains by two
different phenotypic methods.
Material
and Method: The study included 82 A. baumannii
strains isolated in various clinical specimens resistant to carbapenem.
Bacteria identification was performed using conventional manners and an
automated system from BD Phoenix (Becton Dickinson, USA). Antibiotic
susceptibility tests were determined by disc diffusion method in accordance
with the EUCAST recommendation. MBL presence was investigated by the combined
disc method and the modified Hodge test.
Results:
MBL enzyme was detected by combined disc method in 3 of carbobehim resistant 82
A.baumannii strains (3.7%), whereas unde MBL production was detected in 27 of
70 A. baumannii strains tested
(Modifiye Hodge test)
Conclusion:
In our hospital, MBL enzyme positivity was detected at low rate by combination
disc method in carbapenem resistant A. baumannii
strains, but it was detected high with the modified Hodge test. No correlation
was found between the two methods. In conclusion, it would be appropriate to
identify the presence of MBL enzyme by molecular methods which are the
reference methods and to determine which of the two phenotypic methods is more appropriate.
Primary Language | Turkish |
---|---|
Subjects | Health Care Administration |
Journal Section | Original Article |
Authors | |
Publication Date | April 5, 2018 |
Published in Issue | Year 2018 Volume: 1 Issue: 1 |
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Assoc. Prof. Alpaslan TANOĞLU (MD)
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