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D002 CT coding strategy for cochlear implant surgery
International Journal of Pediatric Otorhinolaryngology 75 (2011) S1, 58–60
Contents lists available at ScienceDirect
International Journal of Pediatric Otorhinolaryngology journal homepage: www.elsevier.com/locate/ijporl
D – Radiology and Imaging D001 1.5 and 3T magnetic resonance imaging with the Digisonic® SP Neurelec cochlear implant C. Vincent1 , F.M. Vaneecloo1 , I. Ruzza1 , F. Dubrulle2 . 1 Otology and Neurotology Department, CHRU de Lille, Hˆ opital Salengro, Lille, France; 2 Radiological Department, CHRU de Lille, Lille, France Aim: The goal of this study was to evaluate the 1.5 and 3T MRI compatibility of the Neurelec Digisonic® SP cochlear implant by performing in vitro and in vivo tests. Material and Methods: Torque and force were measured to observe a potential displacement of the internal receiver and demagnetization of the internal magnet was monitored. Potentialinduced voltage on electrodes and heating around the internal receiver were measured in vitro. In vivo MR imaging (brain and posterior fossa MRI) was performed to evaluate the induced signal void and geometrical distortion. Results: In vivo MRI scans demonstrated an image distortion for spin echo sequences of 7 cm maximum at 1.5 T around the internal magnet. Conclusions: Magnetic resonance imaging with the Neurelec Digisonic® SP cochlear implant is possible at 1.5 T with no measurable adverse effects for either the patient or the device. More tests are needed to evaluate 3 T compatibility. D002 CT coding strategy for cochlear implant surgery M.M. Puthiyaparambil1 , S. Vaid2 , N. Vaid3 . 1 ENT Surgeon, MESIARC, Calicut, India; 2 Radiologist, Ruby Memorial Hospital, Pune, India; 3 ENT Surgeon, King Edward Memorial Hospital, Pune, India Aim: As very young infants, children with abnormal inner ears and difficult cases like ossification and cochlear rotation are implanted now, it is vital for a cochlear implant team to have a good preoperative idea of the difficulty level in cochlear implantation though a structures study of the CT scan of the temporal bone. Material and Methods: From two of India’s busiest cochlear implant centers, we have devised a simple system based on Axial HRCT CT studies of the temporal bone to quickly grade the difficulty level in cochlear implant surgery. Results: After validating the grading system in 20 patients, we have found that there is a direct correlation between the grades and difficulty level is surgery Conclusions: Since the grading system has been found to be very useful, we propose this be called the manikoth-vaid classification system D003 Cochlear implantation decision in acute meningitis cases: MRI makes the difference P. Merkus, C.F. Smit, C. Smits, T.S. Goverts, E.F. Hensen. Cochlear Implant Center Amsterdam VUmc, VU University Medical Center, Amsterdam, The Netherlands Aim: To describe cochlear implantation decision making in children with acute meningitis, with a focus on MR imaging. 0165-5876/$ – see front matter © 2011 Elsevier Ireland Ltd. All rights reserved.
Material and Methods: A retrospective case study of MR imaging directly after meningitis in children. In line with the Dutch Consensus [Merkus, Free, Mylanus, et al. Otol Neurotol 2010;31:1281–86], all children with >30 dB hearing loss received contrast enhanced MRI. MR findings were correlated with postmeningitis hearing and cochlear obliteration. Results: Contrast enhanced MRI shows uptake in the cochlea in case of active inflammation. This finding is therefore a precursor for hearing loss and often obliteration. In addition, no enhancement on MRI and normal hearing predicts a normal outcome. Conclusions:Contrast enhanced MRI of the cochlea in children directly after acute meningitis has a predictive value for hearing deterioration and cochlear obliteration, and is crucial in decision making for cochlear implantation. D004 Prognostic value of magnetic resonance imaging in the evaluation of cochlear implant paediatric age group candidates M.N. Calmels, S. Alshehri, A. Sevely, N. Cochard, O. Deguine, B. Fraysse. Department of Otology and Neurotology, Purpan Hospital, Toulouse, France Aim: Classify anomalies found in the cerebral MRI done in the preimplantation workup and search a relation between these findings with implanted children’s performances. Material and Methods: Retrospective study. We classified our population into a normal MRI group and an abnormal one. We compared speech production and perception performances three years after implantation in each group. Results: 138 implanted children underwent MRI study. 55 of them have abnormal MRI finding: 11 cases of anomalies related to infectious pathology, 6 cases of post anoxia pathology, 6 inner ear malformations and 32 cases of unspecific anomalies. Excluding poly-handicapped children, we did not find a difference between the performances of our two major group study. Conclusion: We found a significant proportion of MRI cerebral anomalies in our children cochlear implanted population. These anomalies could be informative for the etiologic research of the deafness but seems not to be predictive of the cochlear implant results. D005 Intra-operative fluoroscopy assisted cochlear implantation in children with inner ear malformations R. Perez1 , J.Y. Sichel1 , J.Th. Roland Jr.2 . 1 Department of Otolaryngology-Head and Neck Surgery, Shaare Zedek Medical Center, Jerusalem, Israel; 2 Department of Otolaryngology-Head and neck Surgery, New York University Langone Medical Center, New-York, NY, USA Aim: To describe the use of real time intra-operative fluoroscopy for cochlear implantation in complex cases. Methods: Five ears (4 patients) were implanted using intraoperative fluoroscopy. Three ears with a common cavity malformation, one with a deformed hypoplastic cochlea and one was a non-user due to non-auditory stimulation. In three ears a
Contents lists available at ScienceDirect
International Journal of Pediatric Otorhinolaryngology journal homepage: www.elsevier.com/locate/ijporl
D – Radiology and Imaging D001 1.5 and 3T magnetic resonance imaging with the Digisonic® SP Neurelec cochlear implant C. Vincent1 , F.M. Vaneecloo1 , I. Ruzza1 , F. Dubrulle2 . 1 Otology and Neurotology Department, CHRU de Lille, Hˆ opital Salengro, Lille, France; 2 Radiological Department, CHRU de Lille, Lille, France Aim: The goal of this study was to evaluate the 1.5 and 3T MRI compatibility of the Neurelec Digisonic® SP cochlear implant by performing in vitro and in vivo tests. Material and Methods: Torque and force were measured to observe a potential displacement of the internal receiver and demagnetization of the internal magnet was monitored. Potentialinduced voltage on electrodes and heating around the internal receiver were measured in vitro. In vivo MR imaging (brain and posterior fossa MRI) was performed to evaluate the induced signal void and geometrical distortion. Results: In vivo MRI scans demonstrated an image distortion for spin echo sequences of 7 cm maximum at 1.5 T around the internal magnet. Conclusions: Magnetic resonance imaging with the Neurelec Digisonic® SP cochlear implant is possible at 1.5 T with no measurable adverse effects for either the patient or the device. More tests are needed to evaluate 3 T compatibility. D002 CT coding strategy for cochlear implant surgery M.M. Puthiyaparambil1 , S. Vaid2 , N. Vaid3 . 1 ENT Surgeon, MESIARC, Calicut, India; 2 Radiologist, Ruby Memorial Hospital, Pune, India; 3 ENT Surgeon, King Edward Memorial Hospital, Pune, India Aim: As very young infants, children with abnormal inner ears and difficult cases like ossification and cochlear rotation are implanted now, it is vital for a cochlear implant team to have a good preoperative idea of the difficulty level in cochlear implantation though a structures study of the CT scan of the temporal bone. Material and Methods: From two of India’s busiest cochlear implant centers, we have devised a simple system based on Axial HRCT CT studies of the temporal bone to quickly grade the difficulty level in cochlear implant surgery. Results: After validating the grading system in 20 patients, we have found that there is a direct correlation between the grades and difficulty level is surgery Conclusions: Since the grading system has been found to be very useful, we propose this be called the manikoth-vaid classification system D003 Cochlear implantation decision in acute meningitis cases: MRI makes the difference P. Merkus, C.F. Smit, C. Smits, T.S. Goverts, E.F. Hensen. Cochlear Implant Center Amsterdam VUmc, VU University Medical Center, Amsterdam, The Netherlands Aim: To describe cochlear implantation decision making in children with acute meningitis, with a focus on MR imaging. 0165-5876/$ – see front matter © 2011 Elsevier Ireland Ltd. All rights reserved.
Material and Methods: A retrospective case study of MR imaging directly after meningitis in children. In line with the Dutch Consensus [Merkus, Free, Mylanus, et al. Otol Neurotol 2010;31:1281–86], all children with >30 dB hearing loss received contrast enhanced MRI. MR findings were correlated with postmeningitis hearing and cochlear obliteration. Results: Contrast enhanced MRI shows uptake in the cochlea in case of active inflammation. This finding is therefore a precursor for hearing loss and often obliteration. In addition, no enhancement on MRI and normal hearing predicts a normal outcome. Conclusions:Contrast enhanced MRI of the cochlea in children directly after acute meningitis has a predictive value for hearing deterioration and cochlear obliteration, and is crucial in decision making for cochlear implantation. D004 Prognostic value of magnetic resonance imaging in the evaluation of cochlear implant paediatric age group candidates M.N. Calmels, S. Alshehri, A. Sevely, N. Cochard, O. Deguine, B. Fraysse. Department of Otology and Neurotology, Purpan Hospital, Toulouse, France Aim: Classify anomalies found in the cerebral MRI done in the preimplantation workup and search a relation between these findings with implanted children’s performances. Material and Methods: Retrospective study. We classified our population into a normal MRI group and an abnormal one. We compared speech production and perception performances three years after implantation in each group. Results: 138 implanted children underwent MRI study. 55 of them have abnormal MRI finding: 11 cases of anomalies related to infectious pathology, 6 cases of post anoxia pathology, 6 inner ear malformations and 32 cases of unspecific anomalies. Excluding poly-handicapped children, we did not find a difference between the performances of our two major group study. Conclusion: We found a significant proportion of MRI cerebral anomalies in our children cochlear implanted population. These anomalies could be informative for the etiologic research of the deafness but seems not to be predictive of the cochlear implant results. D005 Intra-operative fluoroscopy assisted cochlear implantation in children with inner ear malformations R. Perez1 , J.Y. Sichel1 , J.Th. Roland Jr.2 . 1 Department of Otolaryngology-Head and Neck Surgery, Shaare Zedek Medical Center, Jerusalem, Israel; 2 Department of Otolaryngology-Head and neck Surgery, New York University Langone Medical Center, New-York, NY, USA Aim: To describe the use of real time intra-operative fluoroscopy for cochlear implantation in complex cases. Methods: Five ears (4 patients) were implanted using intraoperative fluoroscopy. Three ears with a common cavity malformation, one with a deformed hypoplastic cochlea and one was a non-user due to non-auditory stimulation. In three ears a