Meningitis in cochlear implant recipients: the North American experience.
BACKGROUND
Until recently, postimplant meningitis was infrequently reported and felt to be uncommon. However, in the spring of 2002, there was a sudden increase in the number of reported cases of postimplantation meningitis in both Europe and North America.


OBJECTIVE
Because complications of surgery often tend to be underreported, we decided to survey all cochlear implant centers in North America to determine the true incidence of postimplant meningitis and to learn more about the demographics and risk factors.


METHODS
We conducted a prospective study. A survey instrument was designed asking surgeons the number of implants performed and whether they had seen any cases of meningitis after implantation. If the answer was affirmative, they were asked to respond to a 20-point questionnaire. This instrument was sent to all 401 cochlear implant centers in North America.


METHODS
Tertiary care referral centers.


METHODS
We studied all patients having received cochlear implants in North America.


METHODS
Number of cases of postimplant meningitis, age of patients, device used, cochlear and temporal bone abnormalities, treatment, and outcomes.


RESULTS
Meningitis is more common than previously thought. Risk factors included young age, cochlear dysplasia, temporal bone abnormalities, and the use of a two-part electrode system. This survey led to the involvement by the U.S. Food and Drug Administration and the Centers for Disease Control and Prevention in a much more intensive analysis of a subset of the cases.


CONCLUSIONS
Postimplant meningitis is related to patient, surgical, and device factors. By being aware of the risk factors involved, adhering to sound surgical principles such as packing of the cochleostomy with soft tissue, appropriately vaccinating patients, and eliminating any potentially traumatic electrode arrays, the incidence of meningitis should be significantly diminished.
Cohen
Noel L
NL
Department of Otolaryngology, NYU School of Medicine, New York, NY 10016, USA. Noel.cohen@med.nyu.edu
Roland
J Thomas
JT
Marrinan
Michelle
M
D000367:Age Factors; D016022:Case-Control Studies; D003051:Cochlea / Q000473:pathology; D019929:Cochlear Implantation / Q000009:adverse effects* / Q000379:methods; D003054:Cochlear Implants / Q000009:adverse effects*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008581:Meningitis / Q000453:epidemiology / Q000209:etiology*; D009656:North America / Q000453:epidemiology; D011183:Postoperative Complications / Q000453:epidemiology / Q000209:etiology*; D011446:Prospective Studies; D012307:Risk Factors; D011795:Surveys and Questionnaires; D013701:Temporal Bone / Q000473:pathology