|Year : 2014 | Volume
| Issue : 5 | Page : 235-237
An outbreak of trimethoprim/sulfamethoxazole-resistant Stenotrophomonas maltophilia meningitis associated with neuroendoscopy
Ching-Hsun Wang1, Shih-Wei Hsu2, Tung-Han Tsai2, Ning-Chi Wang1
1 Division of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
2 Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
|Date of Submission||13-Mar-2014|
|Date of Decision||02-May-2014|
|Date of Acceptance||14-May-2014|
|Date of Web Publication||30-Oct-2014|
Dr. Ning-Chi Wang
Department of Internal Medicine, Division of Infectious Diseases and Tropical Medicine, Tri-Service General Hospital, National Defense Medical Center, No. 325, Sec. 2, Cheng-Kung Road, Taipei 114, Taiwan
Republic of China
Source of Support: None, Conflict of Interest: None
Stereotactic aspiration by neuroendoscopy for treatment of deep-seated intracranial hematomas is widely accepted because this procedure is minimally invasive and thereby reduces the probability of iatrogenic brain damage. Herein, we describe an outbreak of trimethoprim/sulfamethoxazole (TMP/SXT)-resistant Stenotrophomonas maltophilia meningitis, possibly from a contaminated neuroendoscopy, and review the previous use of antimicrobial therapies for this condition without TMP/SXT. This is the first reported outbreak of TMP/SXT-resistant S. maltophilia meningitis. The discussion emphasizes the importance of adequate disinfection processes before and after endoscopic neurosurgery and the use of therapeutic options other than TMP/SXT when encountering S. maltophilia meningitis.
Keywords: Trimethoprim/sulfamethoxazole resistance, meningitis, Stenotrophomonas maltophilia, neuroendoscopy
|How to cite this article:|
Wang CH, Hsu SW, Tsai TH, Wang NC. An outbreak of trimethoprim/sulfamethoxazole-resistant Stenotrophomonas maltophilia meningitis associated with neuroendoscopy. J Med Sci 2014;34:235-7
|How to cite this URL:|
Wang CH, Hsu SW, Tsai TH, Wang NC. An outbreak of trimethoprim/sulfamethoxazole-resistant Stenotrophomonas maltophilia meningitis associated with neuroendoscopy. J Med Sci [serial online] 2014 [cited 2019 Jun 16];34:235-7. Available from: http://www.jmedscindmc.com/text.asp?2014/34/5/235/143653
| Introduction|| |
Stereotactic aspiration of an intracranial hematoma with a neuroendoscope is a feasible and effective method to prevent further brain damage.  Although outbreaks of nosocomial infections and pseudoinfections have been linked to contaminated endoscopy, outbreaks associated with contaminated neuroendoscopy have not been reported.  Herein, we report an outbreak of trimethoprim/sulfamethoxazole (TMP/SXT)-resistant Stenotrophomonas maltophilia meningitis. Our investigation concluded that this outbreak resulted from inadequate neuroendoscopic decontamination procedures and identified the most suitable treatment options for TMP/SXT-resistant S. maltophilia meningitis.
| Case Report|| |
A 73-year-old man was sent to our Emergency Department by ambulance following an acute onset of altered consciousness while at home. Upon arrival, the patient was unconscious, his pupils were anisocoric, and he was unresponsive to painful stimulation. Computed tomography of the brain indicated an intracranial hemorrhage in the left basal ganglion, with perifocal edema and uncal herniation. The patient underwent stereotactic aspiration of the hematoma in the left frontal lobe in combination with neuronavigation and drainage of the cerebrospinal fluid (CSF) by use of an external ventricular drain. The intracranial pressure was simultaneously monitored, and he was admitted to the Neuro intensive care unit (NICU) for further treatment.
Five days after admission, the patient had a fever of 38.9°C and laboratory findings indicated a white blood cell count (WBC) of 14,620/μL, hemoglobin of 12.6 g/dL, platelet count of 135,000/μL, and C-reactive protein of 26.32 mg/dL. Analysis of a CSF sample showed a WBC of 156 cells/μL (87% neutrophils, 9% lymphocytes), glucose of 25 mg/dL, protein of 87 mg/dL, and the presence of Gram-negative bacilli. Intravenous vancomycin (2 g/day) and meropenem (6 g/day) were administered empirically. The patient remained febrile despite use of these broad-spectrum antibiotics. Ten days after admission, S. maltophilia was identified in the CSF. The isolate was highly drug-resistant and only susceptible to ceftazidime.
Two days after admission of this first case, a second meningitis case occurred in the same intensive care unit. The second case, a 61-year-old male, was admitted for a spontaneous intracranial hemorrhage in the left thalamus. He received stereotactic neuroendoscopy for a hematoma aspiration that employed the same neuroendoscopy and the same operation room. One week after surgery, this second patient developed a fever of 39.1°C. Analysis of his CSF showed a leukocyte count of 439 cells/μL (71% neutrophils, 29% lymphocytes), glucose of 35 mg/dL, and protein of 284 mg/dL. Twelve days after this second surgery, S. maltophilia was isolated from the CSF. This second isolate had the same antibiogram as the first isolate, and was resistant to TMP/SXT, but susceptible to ceftazidime only.
We were able to isolate S. maltophilia from the neuroendoscopy, but not from other environmental specimens in NICU or the operation room. A review of all medical records during one month before the first case indicated no other cases that were positive for S. maltophilia in the NICU, which we considered a possible source of the infection. Analysis of the records indicated that the neuroendoscopy was reprocessed using a glutaraldehyde disinfectant for sterilization, but the immersion time (1 h) was not long enough to achieve sterilization (3-10 h). Thus, after the second case, we implemented a hydrogen peroxide gas plasma sterilization procedure for neuroendoscopic instruments. In both cases, we adjusted the antimicrobial therapy to ceftazidime 6 g/day, based on the identical antibiograms.
The fever of the first case subsided gradually and after 3-week of intravenous ceftazidime treatment (6 g/day), a follow-up lumbar puncture showed acellular CSF with normal biochemistry and negative culture results. This patient was discharged from the hospital after 3-week ceftazidime treatment. The second case also resolved and was also discharged after 3 weeks of ceftazidime therapy. After switching the disinfection process, there was no new case of S. maltophilia meningitis at our institution.
| Discussion|| |
Meningitis due to S. maltophilia is rarely encountered. Nosocomial S. maltophilia meningitis usually occurs after neurosurgical procedures.  Clinicians should consider the possibility of S. maltophilia infection in patients who present with meningitis after neurosurgery, particularly in those who respond poorly to broad-spectrum antibiotics and who have Gram-negative bacilli in the CSF. There were very few previous cases of S. maltophilia meningitis in our institute, with only four TMP/SXT-susceptible S. maltophilia meningitis in the past 5 years. The two isolates of S. maltophilia meningitis described here were both TMP/SXT-resistant and had identical antibiogram with susceptibility to ceftazidime and ciprofloxacin, prompting an outbreak investigation.
We found that the sterilization procedures used for the neuroendoscope in these two cases did not adhere to decontamination guidelines.  Use of an inadequate disinfectant immersion period may result in persistent S. maltophilia colonization on the surface of a neuroendoscope, and transmission to subsequent cases. Although our investigation was unable to identify the initial contaminated source, we believe that the use of an inappropriate disinfection process is the likely reason for this outbreak. With the widespread use of endoscopic neurosurgery, it is important to use adequate sterilization processes for neuroendoscopic instruments. Unlike other endoscopes, neuroendocopes should be sterilized because they enter sterile tissue. Glutaraldehyde has been most commonly used as a high-level chemical disinfectant, if medical instruments were immersed for 30 min and may function as a chemical sterilant if prolonged immersion of medical instruments with Glutaraldehyde (3-12 h). However, a previous study indicated that even with the use of valid endoscope reprocessing protocols, microbial accumulation can lead to the development of a mature biofilm inside endoscope channels, resulting in subsequent infections.  More effective sterilization processes, as provided by hydrogen peroxide gas plasma, is probably better for neuroendoscopy sterilization. 
Currently, TMP/SXT is recommended for the treatment of S. maltophilia meningitis.  The recent emergence of TMP/SXT-resistant S. maltophilia isolates presents a therapeutic dilemma for clinicians, because there has been minimal testing of the few available cases. , Recent literature on the treatment of S. maltophilia infections suggests that a fluoroquinolone is indicated when there is documentation of resistance or allergy to TMP/SXT.  A review of previous S. maltophilia meningitis cases who required treatment other than TMP/SXT indicated that ciprofloxacin and ceftazidime were used most cases, and that the clinical success rates were 100% [Table 1]. Despite of the in vitro activity of quinolones and ceftazidime to S. maltophilia and above clinical reports, ciprofloxacin use should be cautious because some studies revealed that brain distribution of several quinolones is restricted by the operation of multiple efflux transporters of the brain and may limit its therapeutic effect in treating CNS infection  In contrast, ceftazidime, a 3 rd generation of cephalosporin, may be the drug of choice in such cases for its good penetration into the CSF and had recommended in treating bacterial meningitis, especially in patient after neurosurgery. ,
|Table 1: Cases of S. maltophilia meningitis treated with regimen other than trimethoprim-sulfamethoxazole|
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The present report emphasizes the importance of proper sterilization procedures for neuroendoscopes and our review of the limited number of clinical reports indicate that ciprofloxacin and ceftazidime (alone or in combination with other antibiotics) may be considered as alternatives to TMP/SXT for treatment of S. maltophilia meningitis. Additional published cases and clinical trials are required to formulate a more evidence-based approach for the treatment of patients with S. maltophilia meningitis when TMP/SXT cannot be used.
| Disclosure|| |
The authors declare this study has no conflict of interest.
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