Identifying and understanding optical coherence tomography artifacts that may be confused with glaucoma / Identificando e compreendendo os artefatos de tomografia de coerência óptica que podem ser confundidos com o glaucoma

ABSTRACT Optical coherence tomography is often used for detection of glaucoma as well as to monitor progression. This paper reviews the most common types of artifacts on the optical coherence tomography report that may be confused with glaucomatous damage. We mainly focus on anatomy-related artifacts in which the retinal layer segmentation and thickness measurements are correct. In such cases, the probability maps (also known as deviation maps) show abnormal (red and yellow) regions, which may mislead the clinician to assume disease is present. This is due to the anatomic variability of the individual, and the normative database must be taken into account.

RESUMO A tomografia de coerência óptica é frequentemente usada para detectar glaucoma, bem como para monitorar a progressão. Este artigo analisa os tipos mais comuns de artefatos no relatório de tomografia de coerência óptica que podem ser confundidos com danos glaucomatosos. Nós nos concentramos principalmente nos artefatos relacionados à anatomia em que a segmentação da camada da retina e as medidas de espessura estão corretas. Nesses casos, os mapas de probabilidade (também conhecidos como mapas de desvio) mostram regiões anormais (vermelho e amarelo), o que pode induzir o clínico em erro ao supor que a doença está presente. Isto se deve à variabilidade anatômica do indivíduo, e o banco de dados normativo deve ser levado em conta.

Use of smart glasses for ultrasound-guided peripheral venous access: a randomized controlled pilot study

OBJECTIVE: Smart glasses can provide sonographers with real-time ultrasound images. In the present study, we aimed to evaluate the utility of smart-glasses for ultrasound-guided peripheral venous access.METHODS: In this randomized, crossover-design, simulation study, 12 participants were recruited from the emergency department residents at a university hospital. Each participant attempted ultrasound-guided peripheral venous access on a pediatric phantom at intervals of 5 days with (glasses group) or without (non-glasses group) the use of smart glasses. In the glasses group, participants confirmed the ultrasound image through the lens of the smart glasses. In the non-glasses group, participants confirmed the ultrasound image through the display viewer located next to the phantom. Procedure time was regarded as the primary outcome, while secondary outcomes included the number of head movements for the participant, number of skin punctures, number of needle redirections, and subjective difficulty.RESULTS: No significant differences in procedural time were observed between the groups (non-glasses group: median time, 15.5 seconds; interquartile range [IQR], 10.3 to 27.3 seconds; glasses group: median time, 19.0 seconds; IQR, 14.3 to 39.3 seconds; P=0.58). The number of head movements was lower in the glasses group than in the non-glasses group (glasses group: median, 0; IQR, 0 to 0; non-glasses group: median, 4; IQR, 3 to 5; P<0.01). No significant differences in the number of skin punctures or needle restrictions were observed between the groups.CONCLUSION: Our results indicate that smart-glasses may aid in ensuring ultrasound-guided peripheral venous access by reducing head movements.

Spatial Learning and Memory Using a Radial Arm Maze with a Head-Mounted Display

OBJECTIVE: A radial arm maze (RAM) is an essential tool for assessing spatial learning and memory. Although this tool is widely used to study deficits in spatial memory in animal models, it has several restrictions that prevent its adaptation to human research and training. Therefore, we developed a head-mounted-display RAM (HMD-RAM) program for humans and verified its validity by comparing it to the results obtained by previous RAM studies. We also compared the HMD and a flat monitor as experimental devices. METHODS: Forty participants were recruited for the current study (Study 1: 20 participants with the HMD device; Study 2: 20 participants with the flat monitor). They navigated a virtual room as a first-person viewer and used environmental landmarks to remember their spatial position and orientation. The main dependent measures were working memory error, reference memory error, detection time, travel distance, and participant’s head movements. To validate the program, participants also conducted neuropsychological assessments and self-reported measures. RESULTS: The results for HMD-RAM tasks were consistent with the results of previous research conducted on animals, and the HMD elicited a higher sense of presence, immersion, and simulator sickness than the flat monitor. According to post-experiment questions on navigation strategy, creating landmarks was important when people were discovering locations in their environment, and an HMD was beneficial for better navigation strategy. CONCLUSION: These results suggest that the HMD-RAM is valuable for estimating spatial learning and memory in humans and may be a useful tool for early diagnosis of deficits in spatial learning and memory, including amnestic mild cognitive impairment and Alzheimer’s disease.

Hypomania in Bobble-Head Doll Syndrome: A Case Report of Surgically Treated Stereotypy and Hypomania

A 22-year-old man was admitted with gradually aggravating stereotypic head movement with hypomania. Brain magnetic resonance imaging showed a large suprasellar arachnoid cyst extending into the third ventricle, with obstructive hydrocephalus, characteristic of bobble-head doll syndrome. Endoscopic fenestration of the suprasellar arachnoid cyst was performed. Stereotypic head movement stopped immediately after surgery and hypomanic symptoms gradually improved within a month. During 4 years of follow-up observation without medication, neuropsychiatric symptoms did not relapse. We report our experience of surgically treating stereotypy and hypomania in a case of bobble-head doll syndrome and discuss the possible neuropsychiatric mechanisms of this rare disease.

Influence of head position on the cbct accuracy in assessment of the proximity of the root apices to the inferior alveolar canal

Statement of the Problem: The most important risk factor for inferior alveolar nerve [IAN] damage is the proximity of the mandibular root apices to the alveolar canal. Failure to position the patient's head at standardized orientation during cone beam computed tomography [CBCT] scans might adversely affect the relative position of the alveolar canal and mandibular root apices with subsequent treatment failure

Purpose: The purpose of the present study was to investigate the influence of the orientations of the skull during the scanning procedure on the accuracy of CBCT images in determining the positional relationship of the mandibular tooth apices to the alveolar canal

Materials and Method: CBCT scans of 7 human dry skulls were obtained by using NewTom VGi CBCT in standard, tilt, flexion, extension and rotation positions of the head. The shortest radiographic distance between the mandibular tooth apices and the IAN canal of 20 points were measured on cross sectional images of CBCT in all position scans. A sample t-test was used to compare the measurements at different head position with the standard position values

Results: Significant differences were found in the measurements of normal and tilt orientations. However, there was no statistically significant difference between the measurements in standard position and other deviated positions. The mean errors in all head positions were less than 0.5mm

Conclusion: Alteration of patient head positioning during CBCT scanning does not affect the relative position of the IAN and the apices of posterior teeth

The Effect of a Condylar Repositioning Plate on Condylar Position and Relapse in Two-Jaw Surgery

BACKGROUND: Numerous condylar repositioning methods have been reported. However, most of them are 2-dimensional or are complex procedures that require a longer operation time and a highly trained surgeon. This study aims to introduce a new technique using a condylar repositioning plate and a centric relation splint to achieve a centric relationship. METHODS: We evaluated 387 patients who had undergone surgery for skeletal jaw deformities. During the operation, a centric relation splint, intermediate splint, final centric occlusion splint, and condylar repositioning plate along with an L-type mini-plate for LeFort I osteotomy or a bicortical screw for bilateral sagittal split ramus osteotomy were utilized for rigid fixation. The evaluation included: a physical examination to detect preoperative and postoperative temporomandibular joint dysfunction, 3-dimensional computed tomography and oblique transcranial temporomandibular joint radiography to measure 3-dimensional condylar head movement, and posteroanterior and lateral cephalometric radiography to measure the preoperative and postoperative movement of the bony segment and relapse rate. RESULTS: A 0.3% relapse rate was observed in the coronal plane, and a 2.8% relapse rate in the sagittal plane, which is indistinguishable from the dental relapse rate in orthodontic treatment. The condylar repositioning plate could not fully prevent movement of the condylar head, but the relapse rate was minimal, implying that the movement of the condylar head was within tolerable limits. CONCLUSIONS: Our condylar repositioning method using a centric relation splint and mini-plate in orthognathic surgery was found to be simple and effective for patients suffering from skeletal jaw deformities.

Vestibular Rehabilitation for Patient with Bilateral Peripheral Vestibular Deficit / 대한평형의학회지

Bilateral vestibular deficit affects far fewer patients than unilateral deficit, and thus has been understudied. When bilateral vestibular organs are injured, loss of input of vestibulo-ocular and vestibulo-spinal reflex that normally stabilize the eyes and body, affected patients suffer blurred vision during head movement, postural instability, and disequilibrium. Vestibular rehabilitation therapy is an exercise-based treatment program designed to promote vestibular adaptation and substitution. The rationale for the exercises, which originated from the observation that patients who were active recovered faster, was based on the supposition that the head movements that provoke the patient's dizziness play an important role in hastening the recovery process. Here the author reviews the clinical manifestation and treatment of bilateral vestibular deficit that include vestibular rehabilitation therapy and vestibular device that studied today.

Horizontal canal benign paroxysmal positional vertigo: diagnosis and treatment of 37 patients / Vertigem posicional paroxística benigna do canal horizontal: diagnóstico e tratamento de 37 pacientes

Benign paroxysmal positional vertigo (BPPV), the most frequent cause of vertigo is associated with high morbidity in the elderly population. The most common form is linked to debris in the posterior semicircular canal. However, there has been an increasing number of reported BPPV cases involving the horizontal canals. The purpose of this article is to highlight the clinical features, diagnosis, and treatment in 37 patients with horizontal canal BPPV; twenty-six with geotropic nystagmus, and eleven with the apogeotropic form. Treatment consisted of the Gufoni manoeuver in eighteen patients (48.6%), the barbecue 360° maneuver in twelve patients (32.4%), both manoeuvers in four patients (10.8%), both manoeuvers plus head shaking in one patient (2.7%), and the Gufoni maneuver plus head shaking in two patients. Cupulolithiasis patients were asked to sleep in a forced prolonged position. We obtained a complete resolution of vertigo and nystagmus in 30 patients (81.0%) on the initial visit.

Vertigem posicional paroxística benigna (VPPB) é a causa mais frequente de vertigem e promove alta morbidade na população idosa. A forma mais comum está relacionada com otoconias no canal semicircular posterior. Entretanto, nos últimos anos identifica-se cada vez mais casos de VPPB dos canais horizontais. Os principais objetivos deste artigo são destacar as características clínicas, diagnóstico e tratamentos aplicados em 37 pacientes com VPPB do canal horizontal; vinte e seis com nistagmo geotrópico, e onze com nistagmo apogeotrópico. O tratamento consistiu na manobra de Gufoni em dezoito pacientes (48,6%) manobra do churrasco 360° em doze pacientes (32,4%) ambas as manobras em quatro pacientes (10,8%) ambas as manobras mais a manobra de sacudir a cabeça (MSC) em um paciente (2,7%), e manobra de Gufoni mais MSC em dois pacientes (2,7%). Pacientes com cupulolitíase dormiram uma noite na posição forçada prolongada. Em 30 pacientes (81,0%) o sucesso terapêutico ocorreu na primeira consulta.

The changes of endotracheal tube cuff pressure by the position changes from supine to prone and the flexion and extension of head / 대한마취과학회지

BACKGROUND: The proper cuff pressure is important to prevent complications related to the endotracheal tube (ETT). We evaluated the change in ETT cuff pressure by changing the position from supine to prone without head movement. METHODS: Fifty-five patients were enrolled and scheduled for lumbar spine surgery. Neutral angle, which was the angle on the mandibular angle between the neck midline and mandibular inferior border, was measured. The initial neutral pressure of the ETT cuff was measured, and the cuff pressure was subsequently adjusted to 26 cmH2O. Flexed or extended angles and cuff pressure were measured in both supine and prone positions, when the patient's head was flexed or extended. Initial neutral pressure in prone was compared with adjusted neutral pressure (26 cmH2O) in supine. Flexed and extended pressure were compared with adjusted neutral pressure in supine or prone, respectively. RESULTS: There were no differences between supine and prone position for neutral, flexed, and extended angles. The initial neutral pressure increased after changing position from supine to prone (26.0 vs. 31.5 +/- 5.9 cmH2O, P < 0.001). Flexed and extended pressure in supine were increased to 38.7 +/- 6.7 (P < 0.001) and 26.7 +/- 4.7 cmH2O (not statistically significant) than the adjusted neutral pressure. Flexed and extended pressure in prone were increased to 40.5 +/- 8.8 (P < 0.001) and 29.9 +/- 8.7 cmH2O (P = 0.002) than the adjusted neutral pressure. CONCLUSIONS: The position change from supine to prone without head movement can cause a change in ETT cuff pressure.

Clinical Application of the Head Impulse Test in Vestibular Disorders / 대한평형의학회지

The head impulse test (HIT) is an established way to test the angular vestibulo-ocular reflex (aVOR) at the bedside. When the aVOR is normal, the eyes rotate opposite to the head movement through the angle required to keep images stable on the fovea. If the aVOR is impaired, the eyes move less than required and, at the end of the head rotation, the eyes are not directed at the intended target and the visual image is displaced from the fovea. A promptly-generated corrective saccade brings the image of the target back on the fovea. The identification of this corrective saccade is the signature feature of vestibular hypofunction and has greatly increased the utility of the bedside examination for identifying an aVOR deficit. However, sometimes it is not easy to detect corrective saccades without quantitative HIT devices. Exact execution and interpretation of the HIT are warranted to reduce the diagnostic errors, because the HIT has become an important part of the differential diagnosis of both acute and chronic vestibular disturbances.

The influence of body position on Bielschowsky's test / A influência da posição corporal sobre o teste de Bielschowsky

Purpose: To investigate the veracity of Jampolsky's statement that Bielschowsky's head tilt test is inverted if performed with the patient in the upside-down position and to interpret its neuromuscular mechanism. Methods: We present a series of 10 patients selected from a referred sample who were diagnosed with superior oblique paresis. Hypertropia was measured in the primary position, with the head erect and tilted toward both shoulders with the patient in the erect, supine, and upside-down positions. The last position was achieved by hanging the patient upside-down. Results: As expected, our results showed the veracity of Jampolsky's statement. The forced head tilt difference was inverted or significantly decreased when the test was performed in the upside-down position. Moreover, in all patients, Bielschowsky's phenomenon was neutralized in the supine body position, in which hypertropia with the head erect tended to vanish. In 3 patients, it disappeared completely. Conclusions: This study showed that, in patients with superior oblique paresis, differences in the extent of hypertropia in Bielschowsky's test tended to vanish when the test was performed with the patient in the supine position and invert when it was performed with the patient in the upside-down position. .

Objetivo: Investigar a veracidade da suposição de Jampolsky de que o teste de inclinação da cabeça de Bielschowsky invertese caso seja realizado com o paciente de cabeça para baixo, e tentar interpretar o mecanismo neuromuscular envolvido. Métodos: Apresentamos uma série de 10 pacientes portadores de paresia do oblíquo superior. Foi medida a hipertropia dos pacientes na posição primária do olhar e com a cabeça inclinada para cada um dos lados nas posições ereta, supina e de cabeça para baixo. Resultados: Como esperado, nossos resultados confirmaram a suposição de Jampolsky; além disso, e em todos os pacientes, o fenômeno de Bielschowsky foi neutralizado em posição supina. As diferenças da magnitude da hipertropia ao teste de Bielschowsky diminuiram significativamente ou inverteramse quando o paciente foi testado de cabeça para baixo. Conclusões: Este estudo demonstrou que, nos pacientes com paresia do oblíquo superior, a hipertropia evidenciada pelo teste de Bielschowsky tende a desaparecer com o paciente na posição supina e a se inverter quando o teste é realizado com o paciente de cabeça para baixo. .

Como um balde pode contribuir no diagnóstico neurológico? / How a bucket can contribute to neurological diagnosis?

Moedas, chaves e copos são objetos simples que podem ser utilizadosem uma avaliação neurológica de rotina. Recentemente, um balde de plástico tornou-se parte desse arsenal como instrumento para testar a vertical visual subjetiva à beira do leito. O principal empenho deste manuscrito é ressaltar a utilidade do teste do balde no exame à beira do leito visando demonstrar desvios da percepção da verticalidade em doenças comuns na prática neurotológica tais como: acidente vascular cerebral, doença de Parkinson, parkinsonismo, lesão vestibular unilateral e enxaqueca.

Coins, keys or glasses are simple objects that can be used in a routineneurological evaluation. Recently, a plastic bucket became part of the arsenal as a tool for bedside test of the subjective visual vertical. The main effort of this manuscript is to emphasize the usefulness of the bedside bucket test seeking to show verticality perception deviations in common neurologic diseases such as: stroke, Parkinson disease, parkinsonism, unilateral vestibular lesion, and migraine.

The additional 180° roll test in the determination of affected side of horizontal semicircular canal benign paroxysmal positional vertigo / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To evaluate the significance of additional 180-degree roll test (RT) in the determination of affected side in patients with horizontal semicircular canal benign paroxysmal vertigo (HSC-BPPV).@*METHOD@#One hundred and six patients with HSC-BPPV were performed the 90 degree RT. patients whose affected side cannot be determined by 90 degree RT were performed 180 degree roll test.@*RESULT@#The affected side was deter- mined by the 180 degree RT in 10 cases in which the lesion side cannot be determined by the 90-degree RT.@*CONCLUSION@#The affected side of HSC BPPV was able to be determined by 180 degree RT when it not possible to be determined by 90 degree RT. 180 degree RT is an effective and simple additional method.

Eagle's syndrome: a case report

Eagle's syndrome is a disease caused by an elongated styloid process or calcified stylohyoid ligament. Eagle defined the disorder in 1937 by describing clinical findings related to an elongated styloid process, which is one of the numerous causes of pain in the craniofacial and cervical region. The prevalence of individuals with this anatomic abnormality in the adult population is estimated to be 4% with 0.16% of these individuals reported to be symptomatic. Eagle's syndrome is usually characterized by neck, throat, or ear pain; pharyngeal foreign body sensation; dysphagia; pain upon head movement; and headache. The diagnosis of Eagle's syndrome must be made in association with data from the clinical history, physical examination, and imaging studies. Patients with increased symptom severity require surgical excision of the styloid process, which can be performed through an intraoral or an extraoral approach. Here, we report a rare case of stylohyoid ligament bilaterally elongated to more than 60 mm in a 51-year-old female. We did a surgery by extraoral approach and patient's symptom was improved.

Manobra de sacudir a cabeça para diagnóstico e tratamento da disfunção vestibular / Head shaking maneuver for diagnosis and treatment of vestibular dysfunction

Os autores ressaltam a importância da manobra de sacudir a cabeça(MSC) paramentada com óculos Frenzel (vídeo) infravermelhoscomo um proveitoso recurso de beira de leito em duas situações:para o diagnóstico do desequilíbrio dinâmico da função vestibular ecomo opção terapêutica sensível na cupulolitíase do canal semicircularhorizontal...

The authors emphasize the importance of the Head Shaking Maneuverwith infrared video Frenzel goggles as a useful resource in twobedside situations: for diagnosing dynamic imbalance of vestibularfunction and as a sensitive therapeutic option for benign paroxysmalpositional vertigo of the horizontal canal cupulolithiasis...

Evaluación de la función vestibular angular: prueba de impulso cefálico multiaxial a ojo desnudo / Angular vestibular function assessment: Multiaxial Head Impulse Test

Introducción: La prueba de impulso cefálico consiste en un examen rápido, sencillo para evaluar la función vestibular angular. Clásicamente se utiliza para el canal horizontal, pero puede implementarse para evaluar los canales semicirculares anteriores y posteriores. Objetivo: Explorar la sensibilidad y especificidad de esta prueba para los canales verticales a ojo desnudo en nuestro medio, en relación a la prueba calórica. Material y método: Estudio prospectivo de evaluación de test diagnóstico. Se realizó prueba de impulso cefálico para todos los canales semicirculares a pacientes con indicación de evaluación funcional de VIII par. Resultados: Se evaluaron 118 pacientes, donde 49,2% presentó una prueba calórica clásica alterada. La sensibilidad del impulso cefálico para el canal posterior fue 13,1(0)% (y 3,2%% para el canal anterior) con una especificidad de 100%% para ambos. Para el canal horizontal la sensibilidad fue de 63,9%% y la especificidad de 100%%. Discusión: La prueba de impulso cefálico para los canales anteriores y posteriores a ojo desnudo es altamente específico, pero muy poco sensible, teniendo una utilidad relativa dentro de la clínica, a diferencia de la misma prueba para el canal horizontal que con la misma especificidad pero con una sensibilidad aceptable representa un examen rápido y de simple ejecución.

Introduction: The Head Impulse Head test represents a quick and simple technique for perioheral vestibular function assessment, by means of exploring the vestíbulo-ocular reflex. It is usually períormed on the horizontal semicircular canals planes, but it can also explore the anterior and posterior canals. Aim: To assess the head impulse test's sensitivity and specificity for the anterior and posterior canals on a bedside scenario, taking the classic caloric test as gold standard. Material and method: Prospective test-assessment study. A head impulse test for every semicircular canal was períormed on patients with indication of vestibular study with caloric test. Results: 118 patients were evaluated, where 49,2%% presente an abnormal caloric test. The head impulse test's sensitivity for the posterior canal canal was 13,1%% (3,2%% for the anterior canal). The test's specificity was 100%% for both vertical canals. On the horizontal plane, sensitivity reached 63,9%%, while specificity was 100%% Discussion: The head impulse test for vertical (anterior and posterior) canal on a bedside scenario is highly specific but poorly sensitive, thus having a relatively low clinical utility. On the contrary the test for the horizontal canal remains a quick and simple tool, with acceptable sensitivy and great sensitivity for assessing vestibular function loss.

Development of Multichannel Vestibular Prosthesis for Treatment of Bilateral Vestibular Deficiency / 대한이비인후과학회지

Bilateral loss of vestibular sensation from injuries of vestibular hair cells causes individuals suffering poor vision during head movement, postural instability, chronic disequilibrium, and cognitive distraction. A vestibular prosthesis analogous to cochlear implants but designed to modulate vestibular nerve activity during head movement should improve quality of life for these chronically dizzy individuals. An implantable prosthesis that partly restores normal activity on branches of the vestibular nerve should improve quality of life for individuals disabled by this disorder. There have been many efforts to develop and restore 3-dimensional angular vestibule-ocular reflex and the Johns Hopkins vestibular neuro-engineering laboratory has been developing a head-mounted multichannel vestibular prosthesis that restores sufficient semicircular canal function to partially recreate a normal 3-dimensional angular vestibulo-ocular reflex. In this review, their results are described.

The Selection of the Appropriate Computer Interface Device for Patients With High Cervical Cord Injury

In order to determine the most suitable computer interfaces for patients with high cervical cord injury, we report three cases of applications of special input devices. The first was a 49-year-old patient with neurological level of injury (NLI) C4, American Spinal Injury Association Impairment Scale (ASIA)-A. He could move the cursor by using a webcam-based Camera Mouse. Moreover, clicking the mouse could only be performed by pronation of the forearm on the modified Micro Light Switch. The second case was a 41-year-old patient with NLI C3, ASIA-A. The SmartNav 4AT which responds according to head movements could provide stable performance in clicking and dragging. The third was a 13-year-old patient with NLI C1, ASIA-B. The IntegraMouse enabling clicking and dragging with fine movements of the lips. Selecting the appropriate interface device for patients with high cervical cord injury could be considered an important part of rehabilitation. We expect the standard proposed in this study will be helpful.