|Year : 2014 | Volume
| Issue : 3 | Page : 435-437
Emergence of multi drug resistant bacteria in diabetic patients with lower limb wounds
Wilbin Xavier1, Mangalanandan T Sukumaran2, Ajit Kumar Varma2, Harish Kumar2, Gopi Chellan3
1 Clinical Research Division, Amrita Institute of Medical Sciences & Research Center, Kochi, India
2 Department of Endocrinology Diabetes & Podiatric Surgery, Amrita Institute of Medical Sciences & Research Center, Kochi, India
3 Amrita Center for Nano Sciences & Molecular Medicine Amrita Institute of Medical Sciences & Research Center, Kochi, India
|Date of Web Publication||1-Nov-2014|
Amrita Center for Nano Sciences & Molecular Medicine Amrita Institute of Medical Sciences & Research Center, Kochi
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Xavier W, Sukumaran MT, Varma AK, Kumar H, Chellan G. Emergence of multi drug resistant bacteria in diabetic patients with lower limb wounds. Indian J Med Res 2014;140:435-7
|How to cite this URL:|
Xavier W, Sukumaran MT, Varma AK, Kumar H, Chellan G. Emergence of multi drug resistant bacteria in diabetic patients with lower limb wounds. Indian J Med Res [serial online] 2014 [cited 2020 Apr 2];140:435-7. Available from: http://www.ijmr.org.in/text.asp?2014/140/3/435/143799
Lower limb infections are the largest non-traumatic cause of lower extremity amputations in diabetic patients, accounting for almost 90,000 amputations per year , . Polymicrobial infections are associated with an increased risk of amputations, prolonged hospital stay, increased expenses and higher infection-related mortality  . Ramakant et al reported 66 per cent cultures as polymicrobial and 23 per cent monomicrobial in diabetic wounds. Predominant bacterial isolates were Enterococcus faecalis, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli,. Culture specific antimicrobial therapy coupled with aggressive surgical excision of the necrotic tissue remains the gold standard for managing infections  . Yet, the wound healing, recurrence of infection and lower extremity amputation rates are increasing remarkably among diabetic patients  . Widespread use of antibiotics along with the natural evolution of bacteria has led to a number of multi-drug resistant bacteria (MDRB) , . Acquisition of resistance has become one of the major causes of treatment failure. In contrast, none of the antibacterial agents used in clinical trials possessed sufficiently novel modes of action to circumvent extant antibiotic resistance mechanisms  .
The emergence of MDRBs in diabetic wounds is less studied in Indian population. We, therefore, enrolled 591 consecutive diabetic patients with lower limb wounds who were hospitalized from January to December 2012 at the Podiatry Center, Amrita Institute of Medical Sciences and Research Center, Kochi, Kerala, India. Deep tissue was collected from the wound bed under sterile precaution in the operation theater; and bacterial culture was tested against 40 antibiotics (e.g. colistin, tigecycline, teicoplanin, clindamycin, meropenem, amoxicillin ciprofloxacin) as per the Clinical and Laboratory Standards Institute (CLSI) guidelines  . Bacterial culture and sensitivity were not done for 47 patients as they were hospitalized for correcting their foot deformities (e.g. Charcot foot, Hallux valgus, Equinus deformity). Of the remaining 544 patients, 416 (76.5%) were males and 128 (23.5%) were females. The mean age of the patients was 61.24±10.38 years, HbA1c:9.39±2.27%, platelet count:3.54±1.48×10  /μl and neutrophils:68.1±24.3%.Bacterial infections were found in 448 (82.3%) patients and the remaining 96 (17.7%) patients had no bacterial growth. Predominant bacteria isolated from wounds were E. coli (73/448, 16.3%), P. aeruginosa (48/448, 10.7%), E. faecalis (42/448, 9.4%), Klebsiella pneumoniae (40/448, 8.9%),
S. aureus (40/448, 8.9%) and Coagulase negative Staphylococcus (36/448, 8.0%), Acinetobacter baumannii (23/448, 5.1%), Enterobacter sp. (22/448, 4.9%), Proteus mirabilis (15/448, 3.3%), and Streptococcus sp. (14/448, 3.1%). Common surgical interventions done were wound debridement: (200/591, 34%), toe amputation: (118/591, 20%), below knee amputation: (60/591, 10.2%), mid-foot amputation: (49/591, 8.3%) and above knee amputations: (18/591, 3.0%) and other minor surgeries (146/591, 24%). E.coli , K. pneumoniae, E. faecalis, P. mirabilis, A. baumannii and S. auricularis were predominant bacterial isolates found in patients who underwent above or below knee amputations. The [Figure 1] shows the per cent of MDRBs in diabetic lower limb wounds.
|Figure 1: Most predominant multi drug resistant bacteria (MDRBs) isolated from lower limb wound of patients with diabetes and their antimicrobial resistance. EC, Escherichia coli; PA, Pseudomonas aeruginosa; EF, Enterococcus faecalis; KP, Klebsiella pneumoniae; SA, Staphylococcus aureus; CNS, coagulase negative staphylococci; AB, Acinobacter baumanii; ES, Enterobacter sp; PM, Proteus mirabilis; Strept, Streptococcus sp; CF, Citrobacter freundii; mRSA, methicillin resistant Staphylococcus aureus.|
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E. coli was susceptible to tigecycline and colistin; P.aeruginosa and K. pneumoniae to colistin; E. faecalis to vancomycin, tigecycline and linezolid. E. coli was resistant to beta lactam group (BLG), fluoroquinolones (FQ) and macrolides. P. aeruginosa was resistant to FQ and sensitive to colistin and carbapenem. E. faecalis showed resistance to penicillins and macrolides and susceptibility to vancomycin, tigecycline and linezolid. K. pneumoniae was resistant to BLG and FQ; and susceptible to macrolides and tigecycline. S. aureus was resistant to macrolides and penicillin; and sensitive to FQ and co-trimoxazole.
The study protocol was approved by the ethics committee of the institute. About a decade earlier, only the MRSA (15-30%) and MDR P. aeruginosa (44%) had been reported to be predominant in diabetic wounds , . We observed an increase in many other MDRBs in diabetic patients with lower limb wounds. Goldstein
et al showed that patients who had previously received oral antibiotics were more likely to have MRSA, enterococci, and P. aeruginosa and less likely to have members of Enterobacteriacea and anaerobes isolated from their wounds. With the current expansion of the reservoir of resistant organisms, obtaining reliable deep cultures can help focus antimicrobial therapy against the dominant pathogens  . It is reported that while initiating antimicrobial therapy, vascular status of the lower limb, depth and severity of infection should be considered. When the diabetic wound is ischaemic, the concentration of antibiotics at the wound site may be insufficient to act against the bacteria. Hence the microbe may become resistant to the specific antibiotics  . On the other hand, it is practically difficult to administer higher doses of antibiotics when liver and kidney functions are compromised. Drug and dose related adverse events are the other limiting factors.
The population genetics of pathogenic bacteria has been extensively studied to understand the spread of disease and the evolution of virulence and drug resistance. However, little attention has been paid to bacterial carriage populations, which inhabit hosts without producing disease. Perron et al have found that asymptomatic swine from livestock productions frequently carry populations of Salmonella enterica with a broad range of drug-resistant strains and genetic diversity greatly exceeding from that previously described.
Another major mechanism for bacterial resistance to antibiotics is through the acquisition of a plasmid coding for resistance-mediating proteins.Many of the bacteria become resistant to antibiotics through the process of lateral gene transfer, with the newly acquired genes encoding a variety of resistance-mediating proteins  . This plasmid-encoded resistance has been observed for virtually all classes of antibiotics and in a wide variety of Gram-positive and Gram-negative organisms; many antibiotics are no longer effective due to such plasmid-encoded resistance  . The systematic removal of these resistance-mediating plasmids from the bacteria would re-sensitize bacteria to standard antibiotics  . Intravenous human immunoglobulin therapy was reported to augment opsonic activity against various drug-resistant bacteria, and being tried for treating severe bacterial infections in immunocompromised patients with impaired serum opsonic capacity  .
To conclude, an emergence of MDRBs was observed in lower limb wounds of patients with diabetes. Bacteria isolated from wounds were resistant to most of the antibiotics except colistin, vancomycin, linezolid and tegecycline. Further studies are warranted to understand the reasons for antimicrobial resistance; and for reducing the morbidity and mortality related to wound infections caused by MDRBs.
| Acknowledgment|| |
Authors acknowledge the Amrita Vishwa Vidya Peetham University, Kochi for granting permission to conduct the study at Amrita Institute of Medical Sciences and Research Center.
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