7 results on '"E Boga"'
Search Results
2. Stapes piston insertion depth and clinical correlations
- Author
-
Katharina Wilms, Holger Sudhoff, Philipp Mittmann, Sang Gil Mun, S Müller, Ingo Todt, Hans Björn Gehl, Sven Mutze, E Boga, Evgenia Scheffner, and Grit Rademacher
- Subjects
Orthodontics ,Male ,Materials science ,General Medicine ,Stapes Surgery ,Insertion depth ,medicine.disease ,Prosthesis Design ,law.invention ,Radiography ,Piston ,Ossicular Prosthesis ,Otosclerosis ,Treatment Outcome ,Otorhinolaryngology ,law ,Vestibule ,medicine ,Humans ,Female ,Dislocation ,Stapes ,Retrospective Studies - Abstract
Background: The insertion of the stapes piston within the vestibule provides the physical basis for a successful stapedotomy. An insertion depth of 0.5 mm is recommended to avoid the dislocation of...
- Published
- 2019
3. 3T MRI-based estimation of scalar cochlear implant electrode position
- Author
-
D Seitz, Ingo Todt, Lars-Uwe Scholtz, S Müller, E Boga, Holger Sudhoff, F Tek, and HB Gehl
- Subjects
Otology ,03 medical and health sciences ,0302 clinical medicine ,mental disorders ,Humans ,Medicine ,Prospective Studies ,Cochlear implant ,030223 otorhinolaryngology ,business.industry ,Scala Tympani ,Cochlear Implantation ,Magnetic Resonance Imaging ,Electrode position ,Cochlea ,Electrodes, Implanted ,Cochlear Implants ,General Energy ,Otorhinolaryngology ,030220 oncology & carcinogenesis ,Posizionamento dell’elettrodo ,business ,Nuclear medicine ,Impianto cocleare ,psychological phenomena and processes ,MRI - Abstract
Valutazione con RMN 3-T della posizione degli elettrodi degli impianti cocleari nella scala cocleare.La valutazione del posizionamento dell’elettrodo di un impianto cocleare avviene generalmente mediante tecniche che utilizzano radiazioni ionizzanti come la tomografia computerizzata multi-slice (MSCT), la tomografia a volume digitale (DVT) o la tomografia flat-panel (FPT). Recenti sviluppi nella gestione degli artefatti in risonanza magnetica (MRI) e la possibilità di eseguire MRI senza arrecare comorbidità al paziente impiantato, hanno dimostrato che l’applicazione della MRI a 1,5 T è possibile per stimare il posizionamento dell’elettrodo di un impianto cocleare. Lo scopo dello studio è indagare il posizionamento scalare di un elettrodo a parete per mezzo di MRI a 3 T. In questo studio prospettico sono stati arruolati 10 pazienti sottoposti ad impianto cocleare dotato di magnete bipolare, con elettrodo posizionato a livello intrascalare a parete. I pazienti sono stati valutati con MRI a 3 T, in sequenze T2-pesate con risoluzione di 0,8 mm, assiali e coronali. La posizione intracocleare dell’elettrodo osservata nelle sequenze MRI è stata comparata con quella ottenuta in DVT, eseguita routinariamente nel periodo postoperatorio. In tutti i casi la posizione scalare dell’elettrodo stimata in MRI era sovrapponibile a quella evidenziata in DVT. In tutti i casi è l’elettrodo è stato osservato nella scala timpanica. La posizione dell’elettrodo è stata valutata in modo affidabile a livello del giro basale della coclea, al contrario, la visualizzazione dell’elettrodo nei giri cocleari successivi è risultata difficoltosa. La valutazione con tecniche di MRI a 3 T del posizionamento dell’elettrodo a parete è possibile per il giro basale della coclea. La tipologia di elettrodo gioca un ruolo fondamentale nella stima visiva.Common techniques to evaluate intracochlear electrode position include ionised radiation by multi-slice computer tomography, digital volume tomography (MSCT, DVT) and flat panel tomography (FPT). Recent advances in the knowledge about handling MRI artefacts and the pain-free performance of MRI scans in cochlear implantees showed that estimation of the intracochlear electrode position is possible at 1.5 T with perimodiolar or midmodiolar arrays. The aim of the present study is to evaluate the assessment of the ipsilateral scalar position of a cochlear implant lateral wall electrode by MRI sequences at 3T. In a prospective study we evaluated 10 patients implanted with a diametrically bipolar implant magnet system with a lateral wall electrode in the intrascalar electrode position in an axial and coronal position and a T2 weighted sequence at 3T and a resolution of 0.8 mm. We compared the intracochlear position with routine postoperative DVT scan. In all cases, the MRT-estimated scalar position corresponded with that estimated by DVT scan. In all cases, a scala tympani position was present. While the position in the basal turn is reliably localisable, the first-turn visual assessment is difficult. Estimation of the intracochlear position of lateral wall cochlear implant electrodes by 3T MRI is possible for the basal turn. Electrode design plays a major role in visual assessment.
- Published
- 2019
4. Stapes piston insertion depth and clinical correlations.
- Author
-
Gil Mun S, Scheffner E, Müller S, Mittmann P, Rademacher G, Mutze S, Wilms K, Boga E, Björn Gehl H, Sudhoff H, and Todt I
- Subjects
- Female, Humans, Male, Otosclerosis diagnostic imaging, Prosthesis Design, Radiography, Retrospective Studies, Treatment Outcome, Ossicular Prosthesis, Otosclerosis surgery, Stapes Surgery
- Abstract
Background: The insertion of the stapes piston within the vestibule provides the physical basis for a successful stapedotomy. An insertion depth of 0.5 mm is recommended to avoid the dislocation of the stapes prosthesis (e.g. sneezing). Aims: The objective of this study is to analyze the depth of stapes prosthesis insertion and its correlation with clinical outcome. Material and methods: We observed in a retrospective case series 39 otosclerosis patients after a stapedotomy and a postoperative performed flat panel tomography/cone beam CT. The evaluation included the radiologically found depth of prosthesis insertion within the vestibule, the vestibule depth, and the correlation with the bone conduction (BC) threshold, vertigo, and tinnitus. Results: Insertion depth varied between 0.2 and 1.6 mm (mean 0.74 mm). The ratio of insertion depth versus the vestibule depth was between 8% and 59% (mean 26.6%). We observed no correlation between the insertion depth, the length of the prosthesis, the ratio of insertion depth/vestibule depth, postoperative BC, appearance of vertigo, or tinnitus. Conclusions and significance: In our group, we observed no significant relation between insertion depth of the stapes piston, postoperative vertigo, tinnitus, or decrease of the BC.
- Published
- 2019
- Full Text
- View/download PDF
5. 3T MRI-based estimation of scalar cochlear implant electrode position.
- Author
-
Tek F, MüLler S, Boga E, Gehl HB, Seitz D, Scholtz LU, Sudhoff H, and Todt I
- Subjects
- Cochlea diagnostic imaging, Cochlea surgery, Cochlear Implantation instrumentation, Humans, Prospective Studies, Scala Tympani diagnostic imaging, Cochlear Implantation methods, Cochlear Implants, Electrodes, Implanted, Magnetic Resonance Imaging methods
- Published
- 2019
- Full Text
- View/download PDF
6. Stapes Prosthesis Length: One Size Fits All?
- Author
-
Sudhoff H, Gehl HB, Boga E, Müller S, Wilms K, Mutze S, and Todt I
- Subjects
- Female, Humans, Imaging, Three-Dimensional, Incus diagnostic imaging, Male, Retrospective Studies, Tomography, X-Ray Computed, Ossicular Prosthesis, Otosclerosis surgery, Stapes diagnostic imaging, Stapes Surgery methods, Vestibule, Labyrinth diagnostic imaging
- Abstract
Background: The insertion of the stapes piston into the vestibule provides the physical basis for a successful stapedotomy. In routine clinical practice, two different ways to handle prosthesis length are performed: (1) an individualized measurement of the stapes prosthesis length or (2) a standard prosthesis length for all cases., Objective: The objective of this study was to compare both ways of handling prosthesis length and the effect of these methods on insertional prosthesis depth., Material and Method: We retrospectively evaluated 39 patients after performing a stapedotomy for radiologically estimated vestibular stapes prosthesis insertion depth. The individual measured length data were hypothetically changed to a standard length of 4.75, 5, 5.25, and 5.5 mm, and the insertion depths were compared., Results: The individually measured prosthesis lengths led to an insertion depth between 0.2 and 1.6 mm (mean 0.74 mm). The ratio of insertion depth/vestibular depth was between 8 and 59.1% (mean 26.6%). The different assumed standard lengths led to different rates of the vestibulum positions and possible bony contacts at the vestibulum floor., Conclusion: The individual measurement led to a zero rate of the vestibulum positions of stapes prosthesis pistons with a low insertion depth/vestibular depth ratio., (© 2019 S. Karger AG, Basel.)
- Published
- 2019
- Full Text
- View/download PDF
7. Repeated bile acid therapy for the long-term management of cholesterol gallstones.
- Author
-
Petroni ML, Jazrawi RP, Lanzini A, Zuin M, Pazzi P, Fracchia M, Boga E, Facchinetti D, Alvisi V, Galatola G, Bland JM, Heaton KW, Podda M, and Northfield TC
- Subjects
- Adolescent, Adult, Aged, Chi-Square Distribution, Cholelithiasis metabolism, Female, Follow-Up Studies, Humans, Male, Middle Aged, Prospective Studies, Recurrence, Retreatment, Statistics, Nonparametric, Time Factors, Treatment Outcome, Bile Acids and Salts therapeutic use, Cholelithiasis drug therapy, Cholesterol metabolism, Lithotripsy
- Abstract
Background/aims: Following non-surgical treatment, cholesterol gallstones recur in a high proportion of patients, and recurrence cannot be predicted nor effectively prevented. Our aim was to test prospectively the viability and the efficacy of repeated bile acid therapy, in which recurrent stones are diagnosed at an early stage by regular ultrasound monitoring and promptly retreated, as a strategy for the management of these patients in clinical practice., Methods: One hundred and seventy-two consecutive patients were recruited upon achieving complete gallstone dissolution using non-surgical therapy (bile acids or lithotripsy plus bile acids), and followed up at 6-monthly intervals by ultrasound scan. Gallstone recurrence was promptly treated by a combination of ursodeoxycholic acid plus chenodeoxycholic acid (5 mg/kg per day each) for a period of 2 years, or less if complete redissolution was achieved. Median follow-up period was 34 months (range 6-70)., Results: Forty-five patients had gallstone recurrence; of these, 39 underwent one or more repeated courses of bile acid therapy (follow-up data available in 27). Gallstone recurrence rate was 15% at 1 year and 47% at 5 years. Average annual redissolution rate of recurrent gallstones (intention to treat) was 41%. The proportion of gallstone-free patients in the whole population was 88%, 84%, 77%, 78%, 75% at 1-5 years, respectively, and rose to > 90% at 3 years onwards in patients with single primary stones., Conclusions: We conclude that repeated bile acid therapy maintains the majority of patients gallstone free, and is therefore an effective long-term management strategy, especially in patients with primary single gallstones.
- Published
- 1996
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.