Cochlear implant electrode array misplacement: a cautionary case report. 2012

E Muzzi, and P Boscolo-Rizzo, and R Santarelli, and M A Beltrame
Audiology and Phoniatrics Service, Department of Medical and Surgical Specialties, University of Padua School of Medicine, Treviso Regional Hospital, Treviso, Italy. enrico.muzzi@unipd.it

OBJECTIVE To report a series of pitfalls and complications in a case of cochlear implantation. METHODS Case report. RESULTS An 11-year-old boy affected by auditory neuropathy underwent cochlear implantation. Intra-operative assessment was apparently consistent with correct insertion of the electrode array into the cochlea. However, subsequent high resolution computed tomography revealed that the entire electrode array was curled up within the vestibule. Revision surgery was complicated by cerebrospinal fluid leakage. A straight probe was repeatedly inserted into the internal auditory canal, before conversion to a canal wall down procedure and appropriate positioning of the electrode array. CONCLUSIONS In this case, mild anteriorisation of the facial nerve created an awkward insertion angle for the electrode array via the retro-facial route, which may have triggered the described series of adverse events.

UI MeSH Term Description Entries
D007430 Intraoperative Care Patient care procedures performed during the operation that are ancillary to the actual surgery. It includes monitoring, fluid therapy, medication, transfusion, anesthesia, radiography, and laboratory tests. Care, Intraoperative
D007758 Ear, Inner The essential part of the hearing organ consists of two labyrinthine compartments: the bony labyrinthine and the membranous labyrinth. The bony labyrinth is a complex of three interconnecting cavities or spaces (COCHLEA; VESTIBULAR LABYRINTH; and SEMICIRCULAR CANALS) in the TEMPORAL BONE. Within the bony labyrinth lies the membranous labyrinth which is a complex of sacs and tubules (COCHLEAR DUCT; SACCULE AND UTRICLE; and SEMICIRCULAR DUCTS) forming a continuous space enclosed by EPITHELIUM and connective tissue. These spaces are filled with LABYRINTHINE FLUIDS of various compositions. Labyrinth,Bony Labyrinth,Ear, Internal,Inner Ear,Membranous Labyrinth,Bony Labyrinths,Ears, Inner,Ears, Internal,Inner Ears,Internal Ear,Internal Ears,Labyrinth, Bony,Labyrinth, Membranous,Labyrinths,Labyrinths, Bony,Labyrinths, Membranous,Membranous Labyrinths
D008297 Male Males
D008416 Mastoid The posterior part of the temporal bone. It is a projection of the petrous bone. Mastoid Foramen,Mastoid Bone,Mastoid Process,Bone, Mastoid,Foramen, Mastoid,Mastoid Bones,Mastoid Processes,Mastoids,Process, Mastoid
D012086 Reoperation A repeat operation for the same condition in the same patient due to disease progression or recurrence, or as followup to failed previous surgery. Revision, Joint,Revision, Surgical,Surgery, Repeat,Surgical Revision,Repeat Surgery,Revision Surgery,Joint Revision,Revision Surgeries,Surgery, Revision
D002558 Cerebrospinal Fluid Otorrhea Discharge of cerebrospinal fluid through the external auditory meatus or through the eustachian tube into the nasopharynx. This is usually associated with CRANIOCEREBRAL TRAUMA (e.g., SKULL FRACTURE involving the TEMPORAL BONE;), NEUROSURGICAL PROCEDURES; or other conditions, but may rarely occur spontaneously. (From Am J Otol 1995 Nov;16(6):765-71) Cerebrospinal Otorrhea,Cerebrospinal Fluid Otorrhea, Post-Traumatic,Cerebrospinal Fluid Otorrhea, Spontaneous,Cerebrospinal Fluid Otorrhea, Traumatic,Otorrhea, Cerebrospinal Fluid, Post-Traumatic,Otorrhea, Cerebrospinal Fluid, Spontaneous,Otorrhea, Cerebrospinal Fluid, Traumatic,Otorrhea, Post-Traumatic, Cerebrospinal Fluid,Otorrhea, Spontaneous, Cerebrospinal Fluid,Otorrhea, Traumatic Cerebrospinal Fluid,Post-Traumatic Cerebrospinal Fluid Otorrhea,Post-Traumatic Otorrhea, Cerebrospinal Fluid,Spontaneous Cerebrospinal Fluid Otorrhea,Spontaneous Otorrhea, Cerebrospinal Fluid,Traumatic Cerebrospinal Fluid Otorrhea,Traumatic Otorrhea, Cerebrospinal Fluid,Cerebrospinal Fluid Otorrhea, Post Traumatic,Cerebrospinal Fluid Otorrheas,Otorrhea, Cerebrospinal,Otorrhea, Cerebrospinal Fluid,Post Traumatic Cerebrospinal Fluid Otorrhea,Post Traumatic Otorrhea, Cerebrospinal Fluid
D002648 Child A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL. Children
D003054 Cochlear Implants Electronic hearing devices typically used for patients with normal outer and middle ear function, but defective inner ear function. In the COCHLEA, the hair cells (HAIR CELLS, VESTIBULAR) may be absent or damaged but there are residual nerve fibers. The device electrically stimulates the COCHLEAR NERVE to create sound sensation. Auditory Prosthesis,Cochlear Prosthesis,Implants, Cochlear,Auditory Prostheses,Cochlear Implant,Cochlear Prostheses,Implant, Cochlear,Prostheses, Auditory,Prostheses, Cochlear,Prosthesis, Auditory,Prosthesis, Cochlear
D005154 Facial Nerve The 7th cranial nerve. The facial nerve has two parts, the larger motor root which may be called the facial nerve proper, and the smaller intermediate or sensory root. Together they provide efferent innervation to the muscles of facial expression and to the lacrimal and SALIVARY GLANDS, and convey afferent information for TASTE from the anterior two-thirds of the TONGUE and for TOUCH from the EXTERNAL EAR. Cranial Nerve VII,Marginal Mandibular Branch,Marginal Mandibular Nerve,Seventh Cranial Nerve,Nerve VII,Nerve of Wrisberg,Nervus Facialis,Nervus Intermedius,Nervus Intermedius of Wrisberg,Cranial Nerve VIIs,Cranial Nerve, Seventh,Facial Nerves,Mandibular Nerve, Marginal,Mandibular Nerves, Marginal,Marginal Mandibular Nerves,Nerve VIIs,Nerve, Facial,Nerve, Marginal Mandibular,Nerve, Seventh Cranial,Nerves, Marginal Mandibular,Nervus Faciali,Seventh Cranial Nerves,Wrisberg Nerve,Wrisberg Nervus Intermedius
D005471 Fluoroscopy Production of an image when x-rays strike a fluorescent screen. Fluoroscopies

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