F. Muhawas - Academia.edu (original) (raw)

Papers by F. Muhawas

Ear, nose, & throat journal, Jul 21, 2022

Objectives To study the changes in the coiled configuration of electrode excess lead in the masto... more Objectives To study the changes in the coiled configuration of electrode excess lead in the mastoid cavity in the cochlear implant recipients over time. Methods Post-operative CT scans at two different appointments of fourteen patients with cochlear implants (CI) were retrospectively analyzed using a DICOM viewer software (3D-slicer). Mastoid thickness (MT) was measured in the oblique coronal plane from the round window (RW) entrance to the mastoid edge and inter-cochlear distance (ICD) was measured in the axial plane at the fundus level between two ears. 3D segmentation of the entire inner ear of both sides and coiled electrode excess lead was performed to visually compare the changes in coiled configuration between the two CT scan time points. Result MT and ICD increased logarithmically with the patient’s age, as has been measured from both the 1st and the 2nd CT scans and a weak linear correlation between MT and ICD was observed. Growth in MT and ICT measured between the time of 1st and 2nd CT scans showed a strong linear correlation. In eight cases, changes in the electrode excess lead have been observed in the 2nd CT scan, either a change in the coiling configuration of electrode excess lead or shifted laterally toward the mastoid edge. The ICD growth between the 1st and the 2nd CT scans was >2 mm in only seven cases and all of them were children. All other six cases had no observed changes in the coiled electrode lead. In addition, the mastoid growth between the 1st and the 2nd CT scan was >2.5 mm in only 4 cases. Conclusion Coiled configuration of electrode excess lead could change when the MT and ICD increased over time.

Ear, nose, & throat journal, Jan 7, 2023

Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI)... more Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI) surgery using the OTOPLAN (otology planning software) reconstructed 3D model and to investigate the surgical distance of the retro-facial approach as a direct access to the round window. Methods Computed tomography (CT) scans of the normal temporal bone were included for analysis in this study. OTOPLAN reconstruction was used to build 3D models with specific ear structures for study analysis. Results Twenty-five scans were included; the average age at the time of CT scan was 6.8±12 years. Twelve scans (48%) were right-sided and thirteen (52%) were left-sided. The best trajectory line to the round window was identified in all scans. The retro-facial approach was the optimal approach for 52% of cases (13/25). In all scans, the safe distance from the facial nerve were in favor of the retro-facial approach (P = 0.0011). Conclusion The OTOPLAN reconstructed imaging provided a good analysis of the retro-facial approach and helped in planning the surgical trajectory line towards the round window. Additionally, calculation of the surgical distance can help the surgeon compare the retro-facial approach to the standard facial recess for preoperative planning. These findings may help in robotic surgery.

Scientific Reports, Jan 5, 2023

The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such ... more The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such as basal turn diameter (A-value) and width (B-value) are currently applied for cochleae with two and a half turns of normal development. Most of the inner ear malformation (IEM) types have either less than two and a half cochlear turns or have a cystic apex, making the current available CDL equations unsuitable for cochleae with abnormal anatomies. Therefore, this study aimed to estimate the basal turn length (BTL) from the cochlear parameters of different anatomical types, including normal anatomy; enlarged vestibular aqueduct; incomplete partition types I, II, and III; and cochlear hypoplasia. The lateral wall was manually tracked for 360° of the angular depth, along with the A and B values in the oblique coronal view for all anatomical types. A strong positive linear correlation was observed between BTL and the A-(r 2 = 0.74) and B-values (r 2 = 0.84). The multiple linear regression model to predict the BTL from the A-and B-values resulted in the following equation (estimated BTL = [A × 1.04] + [B × 1.89] − 0.92). The manually measured and estimated BTL differed by 1.12%. The proposed equation could be beneficial in adequately selecting an electrode that covers the basal turn in deformed cochleae.

Journal of Personalized Medicine, Jan 19, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Cureus, Oct 24, 2019

Background Hearing impairment is found to be the most prevalent disabling condition worldwide. Ea... more Background Hearing impairment is found to be the most prevalent disabling condition worldwide. Early diagnosis is crucial to avoid speech and language delays and to ensure the best performance results after cochlear implant (CI) surgery. Universal newborn hearing screening is a way to recognize newborns with a hearing impairment with or without risk factors. In this article, we have studied the effect of the newborn hearing screening program on early presentation to a healthcare center and, hence, early intervention in patients with congenital hearing loss, and reviewed the international numbers. Objectives The objective of this study was to determine whether neonatal hearing screening in Saudi Arabia helped prelingually deaf children to present earlier or not.

Otology & Neurotology, Dec 3, 2020

Background and Objectives: Electrode migration after cochlear implantation (CI) is a rare complic... more Background and Objectives: Electrode migration after cochlear implantation (CI) is a rare complication that accounts for 1to 15% of all revision surgery. This study is a systematic review of the literature for investigating the knowledge and approaches to the incidence of electrode migration after CI. Methods: A systematic electronic search of the literature was carried out using PubMed, Cochrane, Virtual Health Library, Scopus and Web of Science (ISI). All original articles that reported electrode migration after CI surgery were included. The Newcastle-Ottawa Scale and CARE checklist were utilized for the assessment of the risk of bias. Descriptive data analysis was performed using SPSS software. Results: A total of 26 studies including 4,316 patients were included. Out of them, 289 patients had electrode migration following CI. To diagnose electrode migration, traditional computed tomography scan was used in 13 studies, while cone-beam computed tomography was applied in three studies. In addition, electrode migration was detected during intraoperative exploration in eight studies. The most common presenting symptom was change in sound/poor performance (n = 43) followed by pain sensation (n = 15) and facial nerve stimulation (n = 10). Cholesteatoma was the most common associated pathology (n = 10) followed by infection (n = 9) and ossification of the basal turn of the cochlea (n = 8). Conclusion: Electrode migration is a major complication of CI and could be more common than previously thought. As it may occur with or without clinical complaints, long-term follow-up through routine radiological scanning is recommended. Further studies are warranted to identify the underlying mechanism of electrode extrusion and the appropriate fixation method.

Ear, nose, & throat journal, Apr 24, 2020

Objective: The objective of this study was to determine the shape of cochlear basal turn through ... more Objective: The objective of this study was to determine the shape of cochlear basal turn through basic cochlear parameters measurement. The secondary aim was to overlay an image of the precurved electrode array on top of the three-dimensional (3D) image of the cochlea to determine which shape of the cochlear basal turn gives optimal electrode-to-modiolus proximity. Materials and Methods: Computed tomography (CT) preoperative image-data sets of 117 ears were made available for the measurements of cochlear parameters retrospectively. Three-dimensional slicer was used in the visualization and measurement of cochlear parameters from both 3D and 2D (2-dimensional) images of the inner ear. Cochlear parameters including basal turn diameter (A), width of the basal turn (B), and cochlear height (H) were measured from the appropriate planes. B/A ratio was made to investigate which ratios correspond to round and elliptical shape of the cochlear basal turn. Results: The cochlear size as measured by A value ranged between 7.4 mm and 10 mm. The B value and the cochlear height (H) showed a weak positive linear relation with A value. The ratio between the B and A values anything above or below 0.75 could be an indicator for a more roundor elliptical shaped cochlear basal turn, respectively. One sized/shaped commercially available precurved electrode array would not offer a tight electrode-to-modiolus in the cochlea that has an elliptical shaped basal turn as identified by the B/A ratio of <0.75. Conclusion: Accurate measurement of cochlear parameters adds value to the overall understanding of the cochlear geometry before a cochlear implantation procedure. The shape of cochlear basal turn could have clinical implications when comes to electrode-to-modiolus proximity.

Annals of Saudi Medicine, Mar 1, 2014

Annals of Saudi Medicine, Oct 1, 2019

BACKGROUND: Congenital sensorineural hearing loss (SNHL) is a common disability in children. It c... more BACKGROUND: Congenital sensorineural hearing loss (SNHL) is a common disability in children. It can affect normal language development and educational achievement. Today, the time to cochlear implant is delayed for many children, which in turn delays intervention and impacts outcomes. Lack of knowledge and experience with congenital SNHL in the family are critical factors that can delay identification and intervention. OBJECTIVES: Compare treatment seeking behavior in families for a first and second congenitally deaf child. Design: Analytical, cross-sectional using medical record data. SETTING: Ear specialist hospital in Riyadh. SUBJECTS AND METHODS: All patients who presented to the cochlear implant committee from March 2016 to March 2018 and met criteria were included in the study. Data on when the subjects presented to hospital and were approved for cochlear implant were retrieved from the patient files and through phone calls to the family. The age of first suspicion, audiological testing, diagnosis, hearing aid fitting, and the decision for cochlear implant were compared between the first and second child in families with multiple children with congenital SNHL. MAIN OUTCOME MEASURES: The timing difference between the first and second deaf child in seeking treatment. SAMPLE SIZE: 116 (58 pairs). RESULTS: The second child was suspected to have hearing loss 13.6 months earlier than the first child and presented to the cochlear implant committee for final decision 16.7 months earlier than his\her sibling. Differences in the mean ages at suspicion of hearing loss, presentation to the hospital for audiological evaluation, hearing aid fitting, diagnosis, and decision for cochlear implant by cochlear implant committee were statistically significant (P<.001). CONCLUSION: Experience and knowledge has a major effect on early identification. We need to implement educational programs for the public to increase awareness of how to recognize a deaf child and what steps to take. LIMITATIONS: Single-centered. CONFLICT OF INTEREST: None.

Otology & Neurotology, Aug 1, 2018

Objective: To measure the time spent performing intraoperative testing during cochlear implantati... more Objective: To measure the time spent performing intraoperative testing during cochlear implantation (CI) and determine the impact on hospital charges. Study Design: Prospective study. Setting: Tertiary referral hospital. Patients: Twenty-two children (7 mo-18 yr) who underwent a total of 22 consecutive primary and/or revision CIs by a single surgeon from December 2016 to July 2017. Intervention: The time spent performing intraoperative testing, including evoked compound action potentials (ECAP) and electrical impedances (EI), was recorded for each case. The audiologist performing the testing was unaware of the time measurement and subsequent evaluations with regard to cost data. Billing information was used to determine if the testing contributed to increased operative charges to the patient. Outcome Measures: Whether intraoperative testing had an impact on operative charges to the patient. Results: The average time spent in testing (ECAPs/EIs in all cases) was 6.7 minutes (range, 2-26 min). No correlation was found between testing time and preoperative computed tomography findings, the audiologist performing testing, or the electrode type used (p > 0.05). Based on billing data, including time spent in the operating room (OR), 5/22 (23%) cases incurred greater charges than if intraoperative testing had not been performed. Conclusion: Our data suggest that intraoperative testing increases time in the OR and can contribute to increased hospital charges for CI patients. By using testing selectively, costs incurred by patients and hospitals may be reduced. This is of interest in a healthcare environment that is increasingly focused on cost, quality, and outcomes.

Cureus, Sep 17, 2019

Cochlear implants (CIs) are typically activated four weeks after the implantation surgery. This d... more Cochlear implants (CIs) are typically activated four weeks after the implantation surgery. This delay between device implantation and activation lengthens the implant process and consequently induces personal and financial burdens for some patients who travel from remote regions to receive the surgery. However, fitting the speech processor and eliminating the waiting period could decrease the indirect cost associated with cochlear implantation. The objective of this study was to assess the impact of an early CI fitting on the overall cost paid by patients and their families aiming to improve future care strategies for patients receiving CIs. Methods This retrospective study was conducted in a tertiary referral center. All patients who received any kind of CI with early fitting of the speech processor were included. The total financial benefit for the patients and their families over the standard activation visit was investigated by assessing the cost of the non-medical expense for one hospital visit. Results Our results showed that the non-medical cost for each hospital visit associated with cochlear implantation was higher for those who traveled from remote areas: 81 USD for each patient within 200 km of the implantation center and 748.56 USD for each patient farther than 200 km from the implantation center. Conclusions Using the early fitting approach, some of the financial burden associated with implantation could be alleviated.

Otology & Neurotology, Aug 1, 2019

Objective: To evaluate cochlear implantation in Vogt-Koyanagi-Harada syndrome with regard to surg... more Objective: To evaluate cochlear implantation in Vogt-Koyanagi-Harada syndrome with regard to surgical difficulties and hearing outcomes. Patients: Single case report. Intervention(s): Therapeutic complete electrode insertion during surgery despite evident intra-cochlear fibrosis. Main Outcome Measure(s): Postoperative speech audiometry, categories of auditory performance, and speech intelligibility rating. Results: Vogt-Koyanagi-Harada syndrome is a multisystem autoimmune disease that affects tissues containing melanin. It is characterized by bilateral uveitis with auditory, vestibular, and dermatologic manifestations. Standard treatment comprises aggressive administration of systemic corticosteroids. This report describes the use of bilateral cochlear implants in a 30-year-old Saudi woman who presented with uveitis and was diagnosed with Vogt-Koyanagi-Harada syndrome. She had progressive hearing loss in both ears and experienced minimal improvement with hearing aids. The patient underwent sequential cochlear implantation, which was challenging because it was difficult to insert the electrode in the right ear due to intracochlear fibrosis. After more than 5 years of follow-up, she has good hearing in both ears, despite the advancement of ocular disease and recurring visual complaints. Conclusion: This study suggests that patients with Vogt-Koyanagi-Harada syndrome could develop intra-cochlear fibrosis during cochlear implantation due to the autoimmune nature of disease. Moreover, cochlear implantation becomes more difficult with disease advancement. Therefore, it is essential that healthcare professionals consider early detection and prompt treatment of hearing loss in patients with this syndrome.

Electronics

Cochlear implantation is the common treatment for severe to profound sensorineural hearing loss i... more Cochlear implantation is the common treatment for severe to profound sensorineural hearing loss if there is no benefit from hearing aids. Measuring the electrode impedance along the electrode array at different time points after surgery is crucial in verifying the electrodes’ status, determining the compliance levels, and helping to identify the electric dynamic range. Increased impedance values without proper reprogramming can affect the patient’s performance. The prediction of acceptable levels of electrode impedance at different time points after the surgery could help clinicians during the fitting sessions through a comparison of the predicted with the measured levels. Accordingly, clinicians can decide if the measured levels are within the predicted normal range or not. In this work, we used a dataset of 80 pediatric patients who had received cochlear implants with the MED-EL FLEX 28 electrode array. We predicted the impedance of the electrode arrays in each channel at differen...

Ear, Nose & Throat Journal

Objectives: The present literature review discusses the chronological evolution of Cochlear Impla... more Objectives: The present literature review discusses the chronological evolution of Cochlear Implant (CI) activation and its definition among the relevant studies in the literature. In addition, the benefits of standardizing the early activation process in implantation centers worldwide are discussed. Methods: A comprehensive literature search was conducted in the major databases such as PubMed, Scopus, and Embase to retrieve all the relevant articles that reported early activation approaches following CI. Results: The evolution of the timing of early activation after CI has been remarkable in the past few years. Some studies reported the feasibility of early activation 1 day after the CI surgery in their users. Conclusions: Within the last decade, some studies have been published to report the feasibility and outcomes of its early activation. However, the process of early activation was not adequately defined, and no apparent guidelines could be found in the literature.

European Archives of Oto-Rhino-Laryngology

Saudi Journal of Otorhinolaryngology Head and Neck Surgery

Journal of Personalized Medicine

The effect of insertion depth and position of cochlear implant (CI) electrode arrays on speech pe... more The effect of insertion depth and position of cochlear implant (CI) electrode arrays on speech perception remains unclear. This study aimed to determine the relationship between cochlear coverage and speech performance in children with prelingual hearing loss with CI. Pure tone audiometry (PTA) and speech audiometry, including speech reception threshold (SRT) using spondee words and speech discrimination score (SDS) using phonetically balanced monosyllabic words, were tested. The Categories of Auditory Performance (CAP) and Speech Intelligibility Rating (SIR) scales were also used. Thirty-one ears were implanted with the FLEX 28 electrode array, and 54 with the FORM 24 were included in the current study. For the studied ear, the mean cochlear duct length was 30.82 ± 2.24 mm; the mean cochlear coverage was 82.78 ± 7.49%. Cochlear coverage was a significant negative predictor for the mean pure tone threshold across frequecnies of 0.5, 1, 2, and 4 kHz (PTA4) (p = 0.019). Cochlear cover...

Ear, Nose & Throat Journal

Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI)... more Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI) surgery using the OTOPLAN (otology planning software) reconstructed 3D model and to investigate the surgical distance of the retro-facial approach as a direct access to the round window. Methods Computed tomography (CT) scans of the normal temporal bone were included for analysis in this study. OTOPLAN reconstruction was used to build 3D models with specific ear structures for study analysis. Results Twenty-five scans were included; the average age at the time of CT scan was 6.8±12 years. Twelve scans (48%) were right-sided and thirteen (52%) were left-sided. The best trajectory line to the round window was identified in all scans. The retro-facial approach was the optimal approach for 52% of cases (13/25). In all scans, the safe distance from the facial nerve were in favor of the retro-facial approach (P = 0.0011). Conclusion The OTOPLAN reconstructed imaging provided a good analysis o...

Scientific Reports

The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such ... more The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such as basal turn diameter (A-value) and width (B-value) are currently applied for cochleae with two and a half turns of normal development. Most of the inner ear malformation (IEM) types have either less than two and a half cochlear turns or have a cystic apex, making the current available CDL equations unsuitable for cochleae with abnormal anatomies. Therefore, this study aimed to estimate the basal turn length (BTL) from the cochlear parameters of different anatomical types, including normal anatomy; enlarged vestibular aqueduct; incomplete partition types I, II, and III; and cochlear hypoplasia. The lateral wall was manually tracked for 360° of the angular depth, along with the A and B values in the oblique coronal view for all anatomical types. A strong positive linear correlation was observed between BTL and the A- (r2 = 0.74) and B-values (r2 = 0.84). The multiple linear regression m...

Saudi Journal of Otorhinolaryngology Head and Neck Surgery

Ear, nose, & throat journal, Jul 21, 2022

Objectives To study the changes in the coiled configuration of electrode excess lead in the masto... more Objectives To study the changes in the coiled configuration of electrode excess lead in the mastoid cavity in the cochlear implant recipients over time. Methods Post-operative CT scans at two different appointments of fourteen patients with cochlear implants (CI) were retrospectively analyzed using a DICOM viewer software (3D-slicer). Mastoid thickness (MT) was measured in the oblique coronal plane from the round window (RW) entrance to the mastoid edge and inter-cochlear distance (ICD) was measured in the axial plane at the fundus level between two ears. 3D segmentation of the entire inner ear of both sides and coiled electrode excess lead was performed to visually compare the changes in coiled configuration between the two CT scan time points. Result MT and ICD increased logarithmically with the patient’s age, as has been measured from both the 1st and the 2nd CT scans and a weak linear correlation between MT and ICD was observed. Growth in MT and ICT measured between the time of 1st and 2nd CT scans showed a strong linear correlation. In eight cases, changes in the electrode excess lead have been observed in the 2nd CT scan, either a change in the coiling configuration of electrode excess lead or shifted laterally toward the mastoid edge. The ICD growth between the 1st and the 2nd CT scans was &gt;2 mm in only seven cases and all of them were children. All other six cases had no observed changes in the coiled electrode lead. In addition, the mastoid growth between the 1st and the 2nd CT scan was &gt;2.5 mm in only 4 cases. Conclusion Coiled configuration of electrode excess lead could change when the MT and ICD increased over time.

Ear, nose, & throat journal, Jan 7, 2023

Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI)... more Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI) surgery using the OTOPLAN (otology planning software) reconstructed 3D model and to investigate the surgical distance of the retro-facial approach as a direct access to the round window. Methods Computed tomography (CT) scans of the normal temporal bone were included for analysis in this study. OTOPLAN reconstruction was used to build 3D models with specific ear structures for study analysis. Results Twenty-five scans were included; the average age at the time of CT scan was 6.8±12 years. Twelve scans (48%) were right-sided and thirteen (52%) were left-sided. The best trajectory line to the round window was identified in all scans. The retro-facial approach was the optimal approach for 52% of cases (13/25). In all scans, the safe distance from the facial nerve were in favor of the retro-facial approach (P = 0.0011). Conclusion The OTOPLAN reconstructed imaging provided a good analysis of the retro-facial approach and helped in planning the surgical trajectory line towards the round window. Additionally, calculation of the surgical distance can help the surgeon compare the retro-facial approach to the standard facial recess for preoperative planning. These findings may help in robotic surgery.

Scientific Reports, Jan 5, 2023

The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such ... more The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such as basal turn diameter (A-value) and width (B-value) are currently applied for cochleae with two and a half turns of normal development. Most of the inner ear malformation (IEM) types have either less than two and a half cochlear turns or have a cystic apex, making the current available CDL equations unsuitable for cochleae with abnormal anatomies. Therefore, this study aimed to estimate the basal turn length (BTL) from the cochlear parameters of different anatomical types, including normal anatomy; enlarged vestibular aqueduct; incomplete partition types I, II, and III; and cochlear hypoplasia. The lateral wall was manually tracked for 360° of the angular depth, along with the A and B values in the oblique coronal view for all anatomical types. A strong positive linear correlation was observed between BTL and the A-(r 2 = 0.74) and B-values (r 2 = 0.84). The multiple linear regression model to predict the BTL from the A-and B-values resulted in the following equation (estimated BTL = [A × 1.04] + [B × 1.89] − 0.92). The manually measured and estimated BTL differed by 1.12%. The proposed equation could be beneficial in adequately selecting an electrode that covers the basal turn in deformed cochleae.

Journal of Personalized Medicine, Jan 19, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Cureus, Oct 24, 2019

Background Hearing impairment is found to be the most prevalent disabling condition worldwide. Ea... more Background Hearing impairment is found to be the most prevalent disabling condition worldwide. Early diagnosis is crucial to avoid speech and language delays and to ensure the best performance results after cochlear implant (CI) surgery. Universal newborn hearing screening is a way to recognize newborns with a hearing impairment with or without risk factors. In this article, we have studied the effect of the newborn hearing screening program on early presentation to a healthcare center and, hence, early intervention in patients with congenital hearing loss, and reviewed the international numbers. Objectives The objective of this study was to determine whether neonatal hearing screening in Saudi Arabia helped prelingually deaf children to present earlier or not.

Otology & Neurotology, Dec 3, 2020

Background and Objectives: Electrode migration after cochlear implantation (CI) is a rare complic... more Background and Objectives: Electrode migration after cochlear implantation (CI) is a rare complication that accounts for 1to 15% of all revision surgery. This study is a systematic review of the literature for investigating the knowledge and approaches to the incidence of electrode migration after CI. Methods: A systematic electronic search of the literature was carried out using PubMed, Cochrane, Virtual Health Library, Scopus and Web of Science (ISI). All original articles that reported electrode migration after CI surgery were included. The Newcastle-Ottawa Scale and CARE checklist were utilized for the assessment of the risk of bias. Descriptive data analysis was performed using SPSS software. Results: A total of 26 studies including 4,316 patients were included. Out of them, 289 patients had electrode migration following CI. To diagnose electrode migration, traditional computed tomography scan was used in 13 studies, while cone-beam computed tomography was applied in three studies. In addition, electrode migration was detected during intraoperative exploration in eight studies. The most common presenting symptom was change in sound/poor performance (n = 43) followed by pain sensation (n = 15) and facial nerve stimulation (n = 10). Cholesteatoma was the most common associated pathology (n = 10) followed by infection (n = 9) and ossification of the basal turn of the cochlea (n = 8). Conclusion: Electrode migration is a major complication of CI and could be more common than previously thought. As it may occur with or without clinical complaints, long-term follow-up through routine radiological scanning is recommended. Further studies are warranted to identify the underlying mechanism of electrode extrusion and the appropriate fixation method.

Ear, nose, & throat journal, Apr 24, 2020

Objective: The objective of this study was to determine the shape of cochlear basal turn through ... more Objective: The objective of this study was to determine the shape of cochlear basal turn through basic cochlear parameters measurement. The secondary aim was to overlay an image of the precurved electrode array on top of the three-dimensional (3D) image of the cochlea to determine which shape of the cochlear basal turn gives optimal electrode-to-modiolus proximity. Materials and Methods: Computed tomography (CT) preoperative image-data sets of 117 ears were made available for the measurements of cochlear parameters retrospectively. Three-dimensional slicer was used in the visualization and measurement of cochlear parameters from both 3D and 2D (2-dimensional) images of the inner ear. Cochlear parameters including basal turn diameter (A), width of the basal turn (B), and cochlear height (H) were measured from the appropriate planes. B/A ratio was made to investigate which ratios correspond to round and elliptical shape of the cochlear basal turn. Results: The cochlear size as measured by A value ranged between 7.4 mm and 10 mm. The B value and the cochlear height (H) showed a weak positive linear relation with A value. The ratio between the B and A values anything above or below 0.75 could be an indicator for a more roundor elliptical shaped cochlear basal turn, respectively. One sized/shaped commercially available precurved electrode array would not offer a tight electrode-to-modiolus in the cochlea that has an elliptical shaped basal turn as identified by the B/A ratio of <0.75. Conclusion: Accurate measurement of cochlear parameters adds value to the overall understanding of the cochlear geometry before a cochlear implantation procedure. The shape of cochlear basal turn could have clinical implications when comes to electrode-to-modiolus proximity.

Annals of Saudi Medicine, Mar 1, 2014

Annals of Saudi Medicine, Oct 1, 2019

BACKGROUND: Congenital sensorineural hearing loss (SNHL) is a common disability in children. It c... more BACKGROUND: Congenital sensorineural hearing loss (SNHL) is a common disability in children. It can affect normal language development and educational achievement. Today, the time to cochlear implant is delayed for many children, which in turn delays intervention and impacts outcomes. Lack of knowledge and experience with congenital SNHL in the family are critical factors that can delay identification and intervention. OBJECTIVES: Compare treatment seeking behavior in families for a first and second congenitally deaf child. Design: Analytical, cross-sectional using medical record data. SETTING: Ear specialist hospital in Riyadh. SUBJECTS AND METHODS: All patients who presented to the cochlear implant committee from March 2016 to March 2018 and met criteria were included in the study. Data on when the subjects presented to hospital and were approved for cochlear implant were retrieved from the patient files and through phone calls to the family. The age of first suspicion, audiological testing, diagnosis, hearing aid fitting, and the decision for cochlear implant were compared between the first and second child in families with multiple children with congenital SNHL. MAIN OUTCOME MEASURES: The timing difference between the first and second deaf child in seeking treatment. SAMPLE SIZE: 116 (58 pairs). RESULTS: The second child was suspected to have hearing loss 13.6 months earlier than the first child and presented to the cochlear implant committee for final decision 16.7 months earlier than his\her sibling. Differences in the mean ages at suspicion of hearing loss, presentation to the hospital for audiological evaluation, hearing aid fitting, diagnosis, and decision for cochlear implant by cochlear implant committee were statistically significant (P<.001). CONCLUSION: Experience and knowledge has a major effect on early identification. We need to implement educational programs for the public to increase awareness of how to recognize a deaf child and what steps to take. LIMITATIONS: Single-centered. CONFLICT OF INTEREST: None.

Otology & Neurotology, Aug 1, 2018

Objective: To measure the time spent performing intraoperative testing during cochlear implantati... more Objective: To measure the time spent performing intraoperative testing during cochlear implantation (CI) and determine the impact on hospital charges. Study Design: Prospective study. Setting: Tertiary referral hospital. Patients: Twenty-two children (7 mo-18 yr) who underwent a total of 22 consecutive primary and/or revision CIs by a single surgeon from December 2016 to July 2017. Intervention: The time spent performing intraoperative testing, including evoked compound action potentials (ECAP) and electrical impedances (EI), was recorded for each case. The audiologist performing the testing was unaware of the time measurement and subsequent evaluations with regard to cost data. Billing information was used to determine if the testing contributed to increased operative charges to the patient. Outcome Measures: Whether intraoperative testing had an impact on operative charges to the patient. Results: The average time spent in testing (ECAPs/EIs in all cases) was 6.7 minutes (range, 2-26 min). No correlation was found between testing time and preoperative computed tomography findings, the audiologist performing testing, or the electrode type used (p > 0.05). Based on billing data, including time spent in the operating room (OR), 5/22 (23%) cases incurred greater charges than if intraoperative testing had not been performed. Conclusion: Our data suggest that intraoperative testing increases time in the OR and can contribute to increased hospital charges for CI patients. By using testing selectively, costs incurred by patients and hospitals may be reduced. This is of interest in a healthcare environment that is increasingly focused on cost, quality, and outcomes.

Cureus, Sep 17, 2019

Cochlear implants (CIs) are typically activated four weeks after the implantation surgery. This d... more Cochlear implants (CIs) are typically activated four weeks after the implantation surgery. This delay between device implantation and activation lengthens the implant process and consequently induces personal and financial burdens for some patients who travel from remote regions to receive the surgery. However, fitting the speech processor and eliminating the waiting period could decrease the indirect cost associated with cochlear implantation. The objective of this study was to assess the impact of an early CI fitting on the overall cost paid by patients and their families aiming to improve future care strategies for patients receiving CIs. Methods This retrospective study was conducted in a tertiary referral center. All patients who received any kind of CI with early fitting of the speech processor were included. The total financial benefit for the patients and their families over the standard activation visit was investigated by assessing the cost of the non-medical expense for one hospital visit. Results Our results showed that the non-medical cost for each hospital visit associated with cochlear implantation was higher for those who traveled from remote areas: 81 USD for each patient within 200 km of the implantation center and 748.56 USD for each patient farther than 200 km from the implantation center. Conclusions Using the early fitting approach, some of the financial burden associated with implantation could be alleviated.

Otology & Neurotology, Aug 1, 2019

Objective: To evaluate cochlear implantation in Vogt-Koyanagi-Harada syndrome with regard to surg... more Objective: To evaluate cochlear implantation in Vogt-Koyanagi-Harada syndrome with regard to surgical difficulties and hearing outcomes. Patients: Single case report. Intervention(s): Therapeutic complete electrode insertion during surgery despite evident intra-cochlear fibrosis. Main Outcome Measure(s): Postoperative speech audiometry, categories of auditory performance, and speech intelligibility rating. Results: Vogt-Koyanagi-Harada syndrome is a multisystem autoimmune disease that affects tissues containing melanin. It is characterized by bilateral uveitis with auditory, vestibular, and dermatologic manifestations. Standard treatment comprises aggressive administration of systemic corticosteroids. This report describes the use of bilateral cochlear implants in a 30-year-old Saudi woman who presented with uveitis and was diagnosed with Vogt-Koyanagi-Harada syndrome. She had progressive hearing loss in both ears and experienced minimal improvement with hearing aids. The patient underwent sequential cochlear implantation, which was challenging because it was difficult to insert the electrode in the right ear due to intracochlear fibrosis. After more than 5 years of follow-up, she has good hearing in both ears, despite the advancement of ocular disease and recurring visual complaints. Conclusion: This study suggests that patients with Vogt-Koyanagi-Harada syndrome could develop intra-cochlear fibrosis during cochlear implantation due to the autoimmune nature of disease. Moreover, cochlear implantation becomes more difficult with disease advancement. Therefore, it is essential that healthcare professionals consider early detection and prompt treatment of hearing loss in patients with this syndrome.

Electronics

Cochlear implantation is the common treatment for severe to profound sensorineural hearing loss i... more Cochlear implantation is the common treatment for severe to profound sensorineural hearing loss if there is no benefit from hearing aids. Measuring the electrode impedance along the electrode array at different time points after surgery is crucial in verifying the electrodes’ status, determining the compliance levels, and helping to identify the electric dynamic range. Increased impedance values without proper reprogramming can affect the patient’s performance. The prediction of acceptable levels of electrode impedance at different time points after the surgery could help clinicians during the fitting sessions through a comparison of the predicted with the measured levels. Accordingly, clinicians can decide if the measured levels are within the predicted normal range or not. In this work, we used a dataset of 80 pediatric patients who had received cochlear implants with the MED-EL FLEX 28 electrode array. We predicted the impedance of the electrode arrays in each channel at differen...

Ear, Nose & Throat Journal

Objectives: The present literature review discusses the chronological evolution of Cochlear Impla... more Objectives: The present literature review discusses the chronological evolution of Cochlear Implant (CI) activation and its definition among the relevant studies in the literature. In addition, the benefits of standardizing the early activation process in implantation centers worldwide are discussed. Methods: A comprehensive literature search was conducted in the major databases such as PubMed, Scopus, and Embase to retrieve all the relevant articles that reported early activation approaches following CI. Results: The evolution of the timing of early activation after CI has been remarkable in the past few years. Some studies reported the feasibility of early activation 1 day after the CI surgery in their users. Conclusions: Within the last decade, some studies have been published to report the feasibility and outcomes of its early activation. However, the process of early activation was not adequately defined, and no apparent guidelines could be found in the literature.

European Archives of Oto-Rhino-Laryngology

Saudi Journal of Otorhinolaryngology Head and Neck Surgery

Journal of Personalized Medicine

The effect of insertion depth and position of cochlear implant (CI) electrode arrays on speech pe... more The effect of insertion depth and position of cochlear implant (CI) electrode arrays on speech perception remains unclear. This study aimed to determine the relationship between cochlear coverage and speech performance in children with prelingual hearing loss with CI. Pure tone audiometry (PTA) and speech audiometry, including speech reception threshold (SRT) using spondee words and speech discrimination score (SDS) using phonetically balanced monosyllabic words, were tested. The Categories of Auditory Performance (CAP) and Speech Intelligibility Rating (SIR) scales were also used. Thirty-one ears were implanted with the FLEX 28 electrode array, and 54 with the FORM 24 were included in the current study. For the studied ear, the mean cochlear duct length was 30.82 ± 2.24 mm; the mean cochlear coverage was 82.78 ± 7.49%. Cochlear coverage was a significant negative predictor for the mean pure tone threshold across frequecnies of 0.5, 1, 2, and 4 kHz (PTA4) (p = 0.019). Cochlear cover...

Ear, Nose & Throat Journal

Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI)... more Objectives This study aimed to define the best electrode trajectory line in cochlear implant (CI) surgery using the OTOPLAN (otology planning software) reconstructed 3D model and to investigate the surgical distance of the retro-facial approach as a direct access to the round window. Methods Computed tomography (CT) scans of the normal temporal bone were included for analysis in this study. OTOPLAN reconstruction was used to build 3D models with specific ear structures for study analysis. Results Twenty-five scans were included; the average age at the time of CT scan was 6.8±12 years. Twelve scans (48%) were right-sided and thirteen (52%) were left-sided. The best trajectory line to the round window was identified in all scans. The retro-facial approach was the optimal approach for 52% of cases (13/25). In all scans, the safe distance from the facial nerve were in favor of the retro-facial approach (P = 0.0011). Conclusion The OTOPLAN reconstructed imaging provided a good analysis o...

Scientific Reports

The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such ... more The mathematical equations to estimate cochlear duct length (CDL) using cochlear parameters such as basal turn diameter (A-value) and width (B-value) are currently applied for cochleae with two and a half turns of normal development. Most of the inner ear malformation (IEM) types have either less than two and a half cochlear turns or have a cystic apex, making the current available CDL equations unsuitable for cochleae with abnormal anatomies. Therefore, this study aimed to estimate the basal turn length (BTL) from the cochlear parameters of different anatomical types, including normal anatomy; enlarged vestibular aqueduct; incomplete partition types I, II, and III; and cochlear hypoplasia. The lateral wall was manually tracked for 360° of the angular depth, along with the A and B values in the oblique coronal view for all anatomical types. A strong positive linear correlation was observed between BTL and the A- (r2 = 0.74) and B-values (r2 = 0.84). The multiple linear regression m...

Saudi Journal of Otorhinolaryngology Head and Neck Surgery