Nuestros investigadores

Nicolás Pérez Fernández

Índice H
16, (WoS, 14/10/2016)

Publicaciones científicas más recientes (desde 2010)

Autores: Rey-Martinez, J., (Autor de correspondencia); Batuecas-Caletrio, A.; Matino, E.; et al.
Revista: FRONTIERS IN NEUROLOGY
ISSN 1664-2295  Vol. 9  Nº 69  2018 
Background: Visually enhanced vestibulo-ocular reflex (VVOR) is a well-known bedside clinical test to evaluate visuo-vestibular interaction, with clinical applications in patients with neurological and vestibular dysfunctions. Owing to recently developed diagnostic technologies, the possibility to perform an easy and objective measurement of the VVOR has increased, but there is a lack of computational methods designed to obtain an objective VVOR measurement. Objectives: To develop a method for the assessment of the VVOR to obtain a gain value that compares head and eye velocities and to test this method in patients and healthy subjects. Methods: Two computational methods were developed to measure the VVOR test responses: the first method was based on the area under curve of head and eye velocity plots and the second method was based on the slope of the linear regression obtained for head and eye velocity data. VVOR gain and vestibulo-ocular reflex (VOR) gain were analyzed with the data obtained from 35 subjects divided into four groups: healthy (N = 10), unilateral vestibular with vestibular neurectomy (N = 8), bilateral vestibulopathy (N = 12), and cerebellar ataxia, neuropathy, and vestibular areflexia syndrome (CANVAS) (N = 5). Results: Intra-class correlation index for the two developed VVOR analysis methods was 0.99. Statistical differences were obtained by analysis of variance statistical method, comparing the healthy group (VVOR mean gain of 1 +/- 0) with all other groups. The CANVAS group exhibited (VVOR mean gain of 0.4 +/- 0.1) differences when compared to all other groups. VVOR mean gain for the vestibular bilateral group was 0.8 +/- 0.1. VVOR mean gain in the unilateral group was 0.6 +/- 0.1, with a Pearson's correlation of 0.52 obtained when VVOR gain was compared to the VOR gain of the operated side. Conclusion: Two computational methods to measure the gain of VVOR were successfully developed. The VVOR gain values appear to objectively characterize the VVOR alteration observed in CANVAS patients, and also distinguish between healthy subjects and patients with some vestibular disorders.
Autores: D'Albora, R.; Silveira, L.; Carmona, S.; et al.
Revista: CASE REPORTS IN OTOLARYNGOLOGY
ISSN 2090-6765  2017  págs. 291946
Background. False negative fistula testing in patients with chronic suppurative otitis media is a dilemmawhen proceeding to surgery. It is imperative to rule out a dead labyrinth or a mass effect secondary to the cholesteatoma in an otherwise normally functioning inner ear. We present a case series of three patients in whoma bedside vestibuloocular reflex (VOR) evaluation using a head impulse test was used successfully for further evaluation prior to surgery. Results. In all three cases with a false negative fistula test we were able to further evaluate at the bedside and were not only able to register the abnormal VOR but also localize its deterioration to a particular semicircular canal eroded by the fistula. Conclusion. Vestibuloocular reflex evaluation is mandatory in patients with suspected labyrinthine fistula due to cholesteatoma of the middle ear before proceeding to surgery. We demonstrate successful use of a bedside head impulse test for further evaluation prior to surgery in patients with false negative fistula test.
Autores: Cordero-Yanza, J. A.; Vazquez, EVA.; Leonardo, J.C.H.; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 137  Nº 11  2017  págs. 1178 - 1182
Objective: Compare the caloric vestibular test (CVT) and the video head impulse test (vHIT) in the evaluation of Meniere's disease (MD) and to analyze their diagnostic accuracy. Materials and methods: Retrospective review of CVT and vHIT performed in MD patients at a tertiary care referral center in Spain. Results: A total of 88 patients were reviewed. The CVT was abnormal in 67% (n=59) of patients, while the vHIT was abnormal in 66% (n=58) of them. Agreement between both tests was poor, regardless of whether the horizontal semicircular canal (SCC) or all SCC were analyzed (kappa=.21). Anterior SCC pathology was found in 30% (n=27) of the subjects while 51% (n=45) had altered gains in the posterior SCC. Conclusions: Our study shows that patients with MD can have functional deficit involving the vertical semicircular canals, which cannot be detected by the CVT alone. Therefore, both tests should be used in a complementary fashion.
Autores: Batuecas-Caletrio, A. ; Rey-Martínez, J. ; Trinidad-Ruiz, G.; et al.
Revista: FRONTIERS IN NEUROLOGY
ISSN 1664-2295  Vol. 8  2017  págs. 15
Objective: To evaluate vestibular compensation via measurement of the vestibulo-ocular reflex (VOR) following vestibular schwannoma surgery and its relationship with changes in saccades strategy after surgery. Patients: Thirty-six consecutive patients with vestibular schwannomas, without brain-stem compression, underwent surgical resection. Patients were recruited from University Hospital of Salamanca, Spain. Methods: We assessed the age, sex, tumor size, degree of canalicular weakness, and preoperative video head impulse test (gain and saccade organization measured with PR score). Gain and saccade organization were compared with postoperative values at discharge and also at 1, 3, and 6 months. PR scores are a measure of the scatter of refixation saccades. Results: Patients with normal preoperative caloric function had higher PR scores (saccades were scattered) following surgery compared to patients with significant preoperative canal paresis (p < 0.05). VOR gain and the presence of covert/overt saccades preoperatively did not influence the PR score (p > 0.05), but a group of patients with very low VOR gain (< 0.45) and covert/overt saccades before surgery had lower PR scores after surgery. The differences after 6 months were not significant. Conclusion: Patients with more severe vestibular dysfunction before vestibular schwannoma surgery show significantly faster vestibular compensation following surgery, manifested by changes in VOR gain and PR score. The scatter of compensatory saccades (as measured by the PR score) may be a surrogate early marker of clinical recovery, given its relationship to the Dizziness Handicap Inventory.
Autores: Alvarez-Otero R; Pérez-Fernandez, Nicolás;
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 137  Nº 10  2017  págs. 1051-1056
The area of stability among patients shows a reduction to 35-62% of the expected total. That reduction was not found to be dependent on age. CONCLUSION: There is a symmetric reduction in the limits of stability (LOS) in patients with unilateral vestibulopathy who suffer chronic instability. None of the areas measured were correlated with the composite score of the sensory organization test and, as such, must be considered as an adjunct measure to characterize the postural limitations in those patients.
Autores: Frejo L, ; Martin-Sanz E; Teggi R; et al.
Revista: CLINICAL OTOLARYNGOLOGY
ISSN 1749-4478  Vol. 42  Nº 6  2017  págs. 1172-1180.
Cluster analysis defines clinical subgroups in MD, and it extends the phenotype beyond audiovestibular symptoms. This classification will help to improve the phenotyping in MD and facilitate the selection of patients for randomised clinical trials
Autores: Rey Martínez J; McGarvie L; Pérez-Fernandez, Nicolás;
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 137  Nº 3  2017  págs. 270-74
Temperature maps, vorticity, and velocity fields were successfully obtained to characterize the endolymphatic flow during the caloric test in the developed models. In the normal semicircular canal, a well-defined endolymphatic linear flow was obtained, this flow has an opposite direction depending only on the cooling or warming condition of the simulation. For the hydropic model a non-effective endolymphatic flow was predicted; in this model the velocity and vorticity fields show a non-linear flow, with some vortices formed inside the hydropic duct.
Autores: Ribeiro, D. C.; Pérez-Fernandez, Nicolás;
Revista: ACTA OTORRINOLARINGOLOGICA ESPAÑOLA
ISSN 0001-6519  Vol. 67  Nº 1  2016  págs. E1 - E3
En nuestro paciente no había evidencia de trastorno neurológico subyacente, incluso en la RM, y suponemos que el NAP surgió debido a una disfunción de los mecanismos centrales de la estabilización y de la deficiencia del input y la fijación visual, originados por sus antecedentes oftalmológicos. Otro punto de interés en nuestro caso fue la asimetría del nistagmo, probablemente debida al input visual (deficiencia de agudeza visual en el ojo izquierdo), lo que sugiere que el RVO izquierdo puede ser más relativamente inestable que el derecho. Se había postulado que la pérdida visual unilateral no causa por sí misma el NAP7, y en nuestro caso no ha sido demostrado. Sin embargo, el NAP se eliminó tras la última cirugía oftalmológica con éxito.
Autores: Guerra-Jimenez; Pérez-Fernandez, Nicolás;
Revista: ACTA OTORRINOLARINGOLOGICA ESPAÑOLA
ISSN 0001-6519  Vol. 67  Nº 1  2016  págs. 15 - 22
Autores: Guerra JIménez, G.; Pérez-Fernandez, Nicolás;
Revista: ACTA OTORRINOLARINGOLOGICA ESPAÑOLA
ISSN 0001-6519  Vol. 66  Nº 1  2016  págs. 15 - 22
Autores: Rey-Martínez J; Pérez-Fernandez, Nicolás;
Revista: ACTA OTORHINOLARYNGOLOGICA ITALICA
ISSN 0392-100X  Vol. 136  Nº 12  2016  págs. 1225-29
Excellent concordance between RombergLab and clinical approved force platform was obtained (intra-class correlation coefficient =0.94). A Bland and Altman graphic concordance plot was also obtained. The source code used to develop RombergLab was published in open source terms.
Autores: Pérez-Fernandez, Nicolás; Martin-Sanz, E;
Revista: ANNALS OF TRANSLATIONAL MEDICINE
ISSN 2305-5839  Vol. 4  Nº Supl 1  2016  págs. S63
Autores: Marques, P.; Manrique, Raquel; Pérez-Fernandez, Nicolás;
Revista: LARYNGOSCOPE
ISSN 0023-852X  Vol. 125  Nº 8  2015  págs. 1915 - 1920
OBJECTIVE: Assess angular vestibular-ocular reflex (VOR) changes after treatment with intratympanic gentamicin (ITG) for Ménière's disease (MD) and impact on short-term follow-up. DESIGN: Prospective study. METHODS: Patients submitted to ITG for unilateral MD. The gain VOR and the presence of compensatory saccades elicited by rapid head impulses were measured using the video head impulse test (vHIT). RESULTS: The study included 31 subjects (mean age: 59 years). Functional Level Scale (FLS) distributions were 35,5% (FLS3); 32,2% (FLS4); and 32,2% (FLS5). Mean follow-up was 21¿±¿7 months. Multiple injections were needed in nine patients. VOR gain in the treated ear was significantly reduced in all subjects and for all the semicircular canals (paired samples t test; P¿<¿0,05). Gain averages after treatment were 0,61 (superior); 0,69 (horizontal); and 0,47 (posterior). A horizontal canal VOR gain superior to 0,80 after treatment was associated with the need for a second gentamicin injection (Chi-square; P¿=¿0,003). Gain asymmetry between the symptomatic and asymptomatic ear (GASM) was increased after treatment. The rate of vestibular function reduction was 47,9%; 26,0%; and 35,8% for the superior, horizontal, and posterior canals, respectively. According to the receiving operator characteristic curve, the amount of change in GASM must be greater than 7 in order to predict the avoidance of a second procedure (area under the curve [AUC] horizontal canal¿=¿0,861) and the amount of vestibular function reduction in the pathologic ear in patients with a controlled disease must be greater than 17,8% (AUC horizontal canal¿=¿0,843). CONCLUSIONS: When evaluated with the vHIT, intratympanic gentamicin changes in VOR seem to foresee short-term control of vertigo attacks. LEVEL OF EVIDENCE: 4. Laryngoscope, 125:1915-1920, 2015.
Autores: Matiño-Soler, E.; Esteller-More, E.; Martín-Sánchez, J. C.; et al.
Revista: OTOLOGY AND NEUROTOLOGY
ISSN 1531-7129  Vol. 36  Nº 3  2015  págs. 466 - 471
OBJECTIVE: To analyze vestibulo-ocular responses using the video head impulse test in the yaw axis. STUDY DESIGN: Prospective. SETTING: Tertiary and university hospital. PATIENTS: Two hundred twelve healthy subjects with no history of vestibular or neurologic impairment. INTERVENTION: Video head impulse test in the lateral semicircular canal plane. MAIN OUTCOME MEASURES: Vestibulo-ocular reflex (VOR) gain and appearance of refixation saccades (RSs) considering sex, age, and head impulse velocity and direction. RESULTS: Mean gain was 1.06 ± 0.07, and there were no differences between sexes. For all the impulses (n = 9,654; 4,947 rightward and 4,707 leftward), VOR gain decreased as head impulse velocity increased. When gain was evaluated by age and head velocity, it was steady until age 70 years for higher-velocity impulses and until age 90 years for lower-velocity head impulses. RSs were detected in 52 subjects, occurring after impulses to both sides of the head in 22 of these subjects. The number of subjects with RSs was significantly higher after age 71 years, and velocity was correlated, not with age, but with head impulse velocity. CONCLUSION: VOR gain was stable until age 90 years and thereafter dropped. However, this decrease occurred progressively in younger subjects as head impulse velocity increased, with VOR gain for faster head impulses decreasing significantly in subjects older than 70 years. This finding, in addition to the appearance of RSs, can be explained by the effect of aging on the deterioration of the vestibular system in the semicircular canals.
Autores: Larrosa, F.; Benítez, J.; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 135  Nº 11  2015  págs. 1119 - 1127
CONCLUSION: The application described in this study appears to be accurate and valid, thus allowing calculation of a hearing handicap and assessment of the pure-tone air conduction threshold with iPhone/iPad devices. OBJECTIVE: To develop and evaluate a newly developed professional, computer-based hearing handicap calculator and a manual hearing sensitivity assessment test for the iPhone and iPad (AudCal). METHODS: Multi-center prospective non-randomized validation study. One hundred and ten consecutive adult participants underwent two hearing evaluations, a standard audiometry and a pure-tone air conduction test using AudCal with an iOS device. The hearing handicap calculation accuracy was evaluated comparing AudCal vs a web-based calculator. RESULTS: Hearing loss was found in 83 and 84 out of 220 standard audiometries and AudCal hearing tests (Cohen's Kappa = 0.89). The mean difference between AudCal and standard audiogram thresholds was -0.21 ± 6.38 dB HL. Excellent reliability and concordance between standard audiometry and the application's hearing loss assessment test were obtained (Cronbach's alpha = 0.96; intra-class correlation coefficient = 0.93). AudCal vs a web-based calculator were perfectly correlated (Pearson's r = 1).
Autores: Gónzalez Navarro, M.; Manrique, Raquel; Manrique, Manuel Jesús; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 135  Nº 12  2015  págs. 1245 - 1252
CONCLUSION: Patients with cochlear implants should be treated no differently than non-implanted patients with similar symptomatology. OBJECTIVES: To describe the spectrum of symptomatology, treatment, and long-term follow-up of patients with cochlear implant and vestibular complaints. METHODS: This retrospective study included 25 patients with late onset vestibular complaints (more than 1 month post-implantation). Each patient underwent an extensive interrogatory and physical exam with ancillary test to complete a diagnosis. Treatment was given according to this and all patients followed a vestibular rehabilitation program. RESULTS: The total population was 72% male and 28% female, median age was 58 years; minimal follow-up was 9 months (mean = 51, median = 34). Cochleostomy was performed in eight cases and round window insertion was performed in 19 (two patients were removed from each group in the analysis due to their bilateral implantation under a different approach). The mean time from implant to vestibular symptoms was 53 months, median = 32; a Kaplan Meier graphic showed the round window approach has faster onset of symptoms with statistical significance (p = 0.020). The most common complaint was instability in all patients and after both surgical approaches. No difference in symptoms was found with a Kruskall Wallis test except for vertigo spells (more common in the round window approach). In 12 patients the symptomatology was attributed to the implanted side. In the long-term follow-up a relatively high number of patients (20/25) recovered with standard treatment, suggesting the presence of the implant is not associated with poor recovery prognosis.
Autores: Pérez-Fernandez, Nicolás; Eza-Nuñez;
Revista: JOURNAL OF INTERNATIONAL ADVANCED OTOLOGY
ISSN 1308-7649  Vol. 11  Nº 2  2015  págs. 133 - 137
OBJECTIVE: To characterize the response in the video head-impulse test for the assessment of the vestibulo-ocular reflex (VOR) in patients because of vertigo and dizziness. MATERIALS AND METHODS: After rightward and leftward head impulses, the following results evaluated were: gain of the reflex and appearance of refixation saccades. A particular type of response (normal gain VOR and refixation saccades) was evaluated in a group of patients. RESULTS: In patients with a unilateral abnormality consisting of normal gain and refixation saccades, there was a close concordance with the diseased side and the side to which head impulses elicited the abnormal result. CONCLUSION: In the assessment of patients with dizziness, finding a normal gain VOR with refixation saccades indicates the existence of a peripheral vestibulopathy and localizes to the side of the lesion.
Autores: Bautecast-Caletrio; Santa Cruz Ruiz; Muñoz-Herrera; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 1651-2553  Vol. 125  Nº 12  2015  págs. 2784 - 2789
Introduction: Dizziness is a frequent complaint in patients with vestibular schwannoma (VS). An abnormal vestibulo-ocular reflex (VOR) can explain this dizziness in patients with VS. The video Head impulse test (vHIT) offers a chance to describe specifically the VOR findings in such patients. Study Design: Retrospective cases series study in a tertiary referral hospital. Methods: Fifty consecutive patients with VS were classified in accordance with the morphology of the VOR; gain, covert saccade, and overt saccade were analyzed both in the affected side and in the healthy side. For all patients, caloric tests were performed. All patients were tested before surgery. Results: Caloric response was normal in 31 of 50 patients. The video Head impulse test was abnormal in 45 of 50 patients. For the affected side, low horizontal VOR gain was found in 27 of 50 patients, covert saccade was observed in 37 of 50, and overt saccade was observed in 26 of 50. In the healthy side, vHIT was abnormal in 29 of 50 patients, with a low gain in four of 50, covert saccade in seven of 50, and overt saccade in 23 of 50. In VS, gain for the affected side is not associated with caloric response, but gain for the affected side is associated with gain in the healthy side. Covert and overt saccade for the affected side is associated with gain for the affected side. In the healthy side, overt saccade is associated with low gain for the affected side. Conclusions: Video head impulse test improves the vestibular testing before surgery in patients with VS and should be included in the usual clinical tests for these patients.
Autores: Zulueta-Santos, Cristina; Berumen, O. D.; Manrique, Raquel; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 135  Nº 12  2015  págs. 1253 - 1258
Conclusion: The low clinical efficacy of the treatment for patients included in this work correlates with no noticeable effect on the vestibular function. Objective: To assess follow-up in patients with idiopathic and secondary Ménières disease after treatment with intra-tympanic dexamethasone and correlate clinical findings with changes in the vestibular-ocular reflex elicited after stimulation of each of the six semicircular canals. Methods: This is a single center retrospective review of patients presenting the clinical symptomatology of Meniérès disease treated with intra-tympanic dexamethasone. An audiometric evaluation was performed in each patient before and after treatment. The study cohort was divided into two groups: those evaluated after a short period of time and after a long period of time. Results: The study included 30 patients, mean age = 61 years. Differences in mean pure-tone average before and after treatment were non-significant for both treated (0.61 dB, p = 0.723) and untreated (0.59 dB, p = 0.609) ears. Vestibular-ocular reflex gain averages in the treated ear after treatment were 0.73 (superior semicircular canal), 0.86 (horizontal semicircular canal), and 0.69 (posterior semicircular canal). The gain did not vary significantly in the Superior (p = 0.194), the Horizontal (p = 0.646), or the Posterior Semicircular Canal (p = 0.820). Similar were obtained for the untreated ear.
Autores: Martínez, Marta; Manrique, Raquel; Pérez-Fernandez, Nicolás;
Revista: CASE REPORTS IN OTOLARYNGOLOGY
ISSN 2090-6765  Nº 2015  2015  págs. 460 - 757
The aim of this paper is to present for the first time the functional evaluation of each of the vestibular receptors in the six semicircular canals in a patient diagnosed with Meniere's disease during an acute attack. A 54-year-old lady was diagnosed with left Meniere's disease who during her regular clinic review suffers an acute attack of vertigo, with fullness and an increase of tinnitus in her left ear. Spontaneous nystagmus and the results in the video head-impulse test (vHIT) are shown before, during, and after the attack. Nystagmus was initially left beating and a few minutes later an upbeat component was added. No skew deviation was observed. A decrease in the gain of the vestibuloocular reflex (VOR) and the presence of overt saccades were observed when the stimuli were in the plane of the left superior semicircular canal. At the end of the crisis nystagmus decreased and vestibuloocular reflex returned to almost normal. A review of the different possibilities to explain these findings points to a hypothetical utricular damage.
Autores: Batuecas Caletrio, Á.; Matiño-Soler, E.; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 135  Nº 9  2015  págs. 886 - 894
CONCLUSION: The developed software (HITCal) may be a useful tool in the analysis and measurement of the saccadic video head impulse test (vHIT) responses and with the experience obtained during its use the authors suggest that HITCal is an excellent method for enhanced exploration of vHIT outputs. OBJECTIVE: To develop a (software) method to analyze and explore the vHIT responses, mainly saccades. METHODS: HITCal was written using a computational development program; the function to access a vHIT file was programmed; extended head impulse exploration and measurement tools were created and an automated saccade analysis was developed using an experimental algorithm. For pre-release HITCal laboratory tests, a database of head impulse tests (HITs) was created with the data collected retrospectively in three reference centers. This HITs database was evaluated by humans and was also computed with HITCal. RESULTS: The authors have successfully built HITCal and it has been released as open source software; the developed software was fully operative and all the proposed characteristics were incorporated in the released version. The automated saccades algorithm implemented in HITCal has good concordance with the assessment by human observers (Cohen's kappa coefficient = 0.7).
Autores: Pérez-Fernandez, Nicolás;
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 135  Nº 10  2015  págs. 1036 - 1044
CONCLUSION: The effect of visual condition is more intense in the first trial response in normal subjects and patients and in last trial response only in patients. The first trial effect is more evident in compensated patients in the eyes open condition with any type of perturbation, and in non-compensated patients with the angular displacements in either visual condition. OBJECTIVE: The study of body reaction to FTR can help to understand the complex mechanisms involved in the postural response and to develop new therapies to improve stability and prevent falls in unilateral vestibular deficit (UVD). This work describes the adaptation effect and the visual influence on the postural response to repetitive balance perturbation stimulus in normal subjects, compensated, and uncompensated UVD patients. METHODS: The magnitude of displacement has been measured when the support surface is linearly or angularly displaced. The differences between results in the first and late trial, and the differences between the eyes open and eyes closed situation have been compared. RESULTS: Compensated patients recover the adaptation ability to unexpected changes on the support surface through visual preference mechanism. Not compensated patients present hypermetric postural response with greater instability in the eyes open and eyes closed situations.
Autores: Eza Nuñez, P.; Fariñas Álvarez, C.; Pérez-Fernandez, Nicolás;
Revista: JOURNAL OF INTERNATIONAL ADVANCED OTOLOGY
ISSN 1308-7649  Vol. 10  Nº 2  2014  págs. 144 - 149
OBJECTIVE: The caloric test and the video head-impulse test are diagnostic tools that examine the function of the horizontal semicircular canal. There are major differences between the two tests. These are stimulus characteristics, methodology, and function examined. MATERIALS and METHODS: This is a prospective work in 123 patients with different types of vestibular disease seen because of dizziness in which both procedures were performed the same day. First, the spontaneous nystagmus and head-shake nystagmus were measured. The video head-impulse test was carried out, and finally, the caloric test was performed with water at two different temperatures. Both ears were irrigated alternately. Main outcome measures were the canal paresis in the caloric test and gain of vestibulo-ocular reflex, gain asymmetry, and refixation saccades in the vHIT. RESULTS: The caloric test and the vHIT results were fully coincident in 60 patients (48.7%), and the results for both were normal in 36 patients. Discrepancies were found in 3 patients regarding the deficient side, and in 14 patients, an added contralateral (according to the caloric test) abnormal result was obtained. In 46 patients, one of the tests was normal while the other was not, but both were in accordance with the diseased side. The correlation coefficient for canal paresis and gain asymmetry was 0.67, and the agreement was low: kappa=0.252. CONCLUSION: The assessment of horizontal semicircular canal function with the vHIT needs to take into consideration not only the gain in VOR but also the existence of refixation saccades. The information from both methods is redundant in some cases but complementary in most, and the existence of discrepancies is very low.
Autores: Manrique, Manuel Jesús; Piciafuocco, S.; Manrique, Raquel; et al.
Revista: OTOLOGY AND NEUROTOLOGY
ISSN 1531-7129  Vol. 35  Nº 4  2014  págs. 619 - 628
HYPOTHESIS: Evaluate, based on morphologic and histologic parameters, the atraumaticity of 2 electrode arrays implanted in 10 human temporal bones. BACKGROUND: Atraumatic surgery and electrode arrays are current topics in otologic surgery. The preservation of cochlear anatomy and its functions is a priority and morphologic evaluation of the surgical trauma is essential to continue improving in this field. METHODS: Ten preserved human temporal bones (TB) without anatomic alterations were used in this study. They were divided into 2 groups of 5, and atraumatic surgery was performed to insert HiFocus 1J (group A) and HiFocus Helix (group B) electrode arrays. Anatomic comparisons were performed using computed tomography and histologic analysis. RESULTS: Group A: the mean length for the cochlear longitudinal axis was 10.30 mm, and the cochlear transversal axis was 7.2 mm. Scala tympani insertion was achieved in 4/5 TB studied, with a mean depth and angle of insertion of 19.2 mm and 325.5°, respectively. Lateral location of the electrode array was achieved in all specimens. No significant correlation was observed between these dimensions and depth of insertion. Group B: the mean length for the cochlear longitudinal axis was 9.52 mm, and cochlear transversal axis was 6.38 mm. Scala tympani insertion was achieved in 4/5 TB studied, with a mean depth and angle of insertion of 17.5 mm and 352°, respectively. Modiolar location of the electrode array was achieved in all specimens. A positive correlation was established between the linear and angular insertion depths (p = 0.044). CONCLUSION: In summary, it is safe to state that neither electrode array shows significant insertion trauma.
Autores: batuecas-caletrio A; Santa Cruz-Ruiz S; Muñoz-Herrera A; et al.
Revista: LARYNGOSCOPE
ISSN 0023-852X  Vol. 24  Nº 6  2014  págs. 1431-1450
Long-term follow-up after vestibular schwannoma surgery has shown that 22% of the patients display a particular abnormality in the VOR because refixation saccades occur in a random fashion after elicitation of the reflex in the HIT test. These patients report the higher level of vestibular disability and handicap
Autores: Zulueta-Santos, Cristina; et al.
Revista: AMERICAN JOURNAL OF OTOLARYNGOLOGY
ISSN 0196-0709  Vol. 35  Nº 4  2014  págs.  529-543
The differential diagnosis of patients with acute unilateral vestibulopathy rests in the proper clinical assessment and use of selected tests of vestibular function. In case of a central nervous system lesion as in Multiple Sclerosis, the case shown here, it is of particular importance to observe congruency between severity of symptoms and signs and, of topographic diagnosis. We report a case of a 37-year-old woman with recent onset disequilibrium that after careful analysis of the different test results several incongruences were found; this prompted a radiological study that provided the clue to diagnosis. After treatment the patient recovered completely not only clinically but also in vestibular deficit.
Autores: Marques, P.; Castillo, R.; Santos, M.; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 134   Nº 5  2014  págs. 491 - 496
CONCLUSIONS: The presence of orthotropic nystagmus (ON), in multiple positions, appears to predict the success of canalith repositioning maneuvers (CRMs). In this sense CRMs under video-Frenzel are informative for the immediate follow-up, although not related to the degree of disability or emotional distress. Still, attention should be given to psychological assistance even in cases of clinically cured benign paroxysmal positional vertigo (BPPV). OBJECTIVE: The aim of the study was to highlight the prognostic value of nystagmus in CRMs for BPPV and its relevance for emotional and patient-perceived disability. METHODS: A group of 57 patients were selected from 3 balance disorders centers. CRMs were performed under video-Frenzel control. Assessment of patient disability and positional nystagmus was performed 2 months later. Emotional (Cuestionario de Impacto Emocional del Vértigo, CIEV) and quality of life (Dizziness Handicap Inventory, DHI) impact were evaluated. RESULTS: The posterior semicircular canal (SCC) was affected in 84.2% of cases, the horizontal SCC in 10.5%, and the anterior SCC in 5.1%. Appropriate CRMs were performed. ON was present in 67% of cases. Overall resolution after the first treatment was achieved in 56% of cases. With ON present the success rate was 63% and when not observed the rate was 42%. DHI or CIEV scores were not significantly different when comparing the presence vs absence of ON. In nine patients (16%) an abnormal CIEV score was observed after treatment, even though a cured status was achieved in six of these nine patients.
Autores: De Stefano, A.; Dispenza, F.; Suarez, H.; et al.
Revista: AURIS NASUS LARYNX
ISSN 0385-8146  Vol. 41  Nº 1  2014  págs. 31 - 36
Primary objective of this study was to find a statistical link between the most worldwide comorbidities affecting the elderly population (hypertension, diabetes, osteoarthrosis, osteoporosis and depression) and recurrent episodes of BPPV. Secondary objective was defining possible "groups of risk" for people suffering recurrent positional vertigo related to the presence of a well documented comorbidity. METHODS: This was an observational, cross-sectional, multicenter, spontaneous, non-pharmacological study. The data of 1092 patients suffering BPPV evaluated in 11 different Departments of Otolaryngology, Otoneurology and Neurology, referring Centers for positional vertigo evaluation, were retrospectively collected. RESULTS: Regarding evaluated comorbidities (hypertension, diabetes, osteoarthrosis, osteoporosis and depression), data analysis showed the presence of at least one comorbid disorder in 216 subjects (19.8%) and 2 or more in 408 subjects (37.4%). Moreover there was a statistical significant difference between the number of comorbidities and the number of recurrences, otherwise said as comorbidity disorders increased the number of relapses increased too. CONCLUSION: The presence of a systemic disease may worsen the status of the posterior labyrinth causing a more frequent otolith detachment. This condition increases the risk for patients suffering BPPV to have recurrent episodes, even if correctly managed by repositioning maneuvers. The combination of two or more of aforementioned comorbidities further increases the risk of relapsing BPPV, worsened by the presence of osteoporosis. On the basis of this results it was possible to define "groups of risk" useful for predicting BPPV recurrence in patients with one or more comorbidity.
Autores: Pérez-Fernandez, Nicolás; Martínez, Marta; Manrique, Raquel;
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 1651-2553  Vol. 134  Nº 5  2014  págs. 485-490
The mean gain of VOR was within normal limits for the six semicircular canals and there were no significant differences between the same canals on each side of patients with BPPV in whom canalolithiasis was located in the SSC. However, gain asymmetry was different for each pair of canals.
Autores: Cabrera, S,; Sánchez, E. ; Requena, T. ; et al.
Revista: PLOS ONE
ISSN 1932-6203  Vol. 9  Nº 11  2014  págs. e112171
Meniere's disease is an episodic vestibular syndrome associated with sensorineural hearing loss (SNHL) and tinnitus. Patients with MD have an elevated prevalence of several autoimmune diseases (rheumatoid arthritis, systemic lupus erythematosus, ankylosing spondylitis and psoriasis), which suggests a shared autoimmune background. Functional variants of several genes involved in the NF-¿B pathway, such as REL, TNFAIP3, NFKB1 and TNIP1, have been associated with two or more immune-mediated diseases and allelic variations in the TLR10 gene may influence bilateral affectation and clinical course in MD. We have genotyped 716 cases of MD and 1628 controls by using the ImmunoChip, a high-density genotyping array containing 186 autoimmune loci, to explore the association of immune system related-loci with sporadic MD. Although no single nucleotide polymorphism (SNP) reached a genome-wide significant association (p<10(-8)), we selected allelic variants in the NF-kB pathway for further analyses to evaluate the impact of these SNPs in the clinical outcome of MD in our cohort. None of the selected SNPs increased susceptibility for MD in patients with uni or bilateral SNHL. However, two potential regulatory variants in the NFKB1 gene (rs3774937 and rs4648011) were associated with a faster hearing loss progression in patients with unilateral SNHL. So, individuals with unilateral MD carrying the C allele in rs3774937 or G allele in rs4648011 had a shorter mean time to reach hearing stage 3
Autores: Soto-Varela, A; Arán-González I; López-Escamez, JA,; et al.
Revista: ACTA OTORRINOLARINGOLOGICA ESPAÑOLA
ISSN 0001-6519  Vol. 63  Nº 3  2014  págs. 125-131
The current classification, with the criteria it includes, allows labelling with an acceptable consensus to only 62% of the patients. Therefore, a modification in the classification is proposed in relation with the probable BPPV epigraph, as well a revision of the entries for vertigo-migraine and vertigo associated with migraine.
Autores: Zulueta-Santos, Cristina; Lujan, B.; Manrique, Raquel; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 1651-2553  Vol. 134  Nº 11  2014  págs. 1128 - 1133
Abstract Conclusion: The distribution of abnormal results is not uniform between different canals in each patient; the most frequent gain reduction is obtained for the posterior canal. Gain reduction reflects the disease duration and amount of hearing loss. OBJECTIVE: To test the hypothesis that the vestibulo-ocular reflex (VOR) evoked after stimulation of each semicircular canal behaves in a different manner in patients with unilateral definite Ménière's disease. METHODS: We studied the VOR evoked by rapid head-impulses in the plane of the 6 semicircular canals in 36 patients. It was evaluated with a video system that analyzes the head and eye velocity and the gain was the objective measure. RESULTS: In 12 (33.3%) patients the examination of both ears was normal for all the semicircular canals, in 12 patients the results from the affected ear were abnormal in at least 1 of the semicircular canals, in 11 (30.5%) patients the results were abnormal in at least 1 of the semicircular canals in both the affected and unaffected ears, and in 1 (2.9%) patient the results were abnormal only in the unaffected ear. The most frequent abnormal result was obtained from the posterior canal of the affected ear and from the coupled superior canal of the unaffected ear. The distribution of abnormal findings was dependent on the disease duration and hearing loss.
Autores: Requena, T; Gazquez, I; Moreno A; et al.
Revista: IMMUNOGENETICS
ISSN 0093-7711  Vol. 65  Nº 5  2013  págs. 345-355
Toll-like receptors trigger the innate immune response by activating various cell types such us macrophages and lymphocytes. We genotyped SNV of TLR3, TRL7, TLR8 and TLR10 in 863 Spanish and 150 Italian patients with Meniere's disease (MD) and 1,013 controls by using Taqman assays. Real-Time qPCR was used to measure the expression level of TLR10 in peripheral blood leukocytes. The overall dataset showed that the C allele and the CC genotype of rs11096955 in TLR10 gene were more commonly observed in controls than patients (corrected p¿=¿1¿×¿10(-3), OR¿=¿0.68 [95 % confidence interval, 0.54-0.84] for CC genotype; corrected p¿=¿1.5¿×¿10(-5), OR¿=¿0.75 [0.66-0.85] for allele C). Moreover, the CC genotype was more frequent in patients with uni- (19 %) than bilateral sensorineural hearing loss (SNHL) (13 %). Logistic regression demonstrated that the time since the onset of MD, Tumarkin crises, hearing stage and rs11096955 were independent factors influencing the risk of bilateral SNHL. In addition, rs11096955 influenced hearing loss progression in patients with bilateral MD. No change in expression of TLR10 was observed according to CC, CA or AA genotypes. Our data suggest that allelic variants of TLR10 gene may influence the susceptibility and time-course of hearing loss of MD in the European population.
Autores: Requena T; Espinosa-Sanchez JM, ; Cabrera S; et al.
Revista: CLINICAL GENETICS
ISSN 0009-9163  2013 
The aims of this study were to estimate the prevalence of familial cases in patients with Meniere's disease (MD) and to identify clinical differences between sporadic and familial MD. We recruited 1375 patients with definite MD according to the American Academy of Otolaryngology-Head and Neck Surgery criteria, obtaining the familial history of hearing loss or episodic vertigo by direct interview or a postal survey in 1245 cases in a multicenter study. Familial clustering was estimated by the recurrence risk ratio in siblings (¿s ) and offspring (¿o ) using intermediate and high prevalence values for MD in European population. A total of 431 patients (34%) reported a familial history of hearing loss or recurrent vertigo and 133 patients had a relative with possible MD. After clinical reevaluation, 93 relatives in 76 families were diagnosed of definite MD (8.4%), including three pairs of monozygotic twins. ¿s and ¿o were 16-48 and 4-12, respectively. We observed genetic heterogeneity, but most families had an autosomal dominant inheritance with anticipation. No clinical differences were found between sporadic and familial MD, except for an early onset in familial cases. We may conclude that MD has a strong familial aggregation and that sporadic and familial MDs are clinically identical.
Autores: Batuecas Caletrio, A; Santacruz Ruiz, S; Muñoz Herrera, A; et al.
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  2013 
Abstract Conclusions: The degree of caloric weakness before surgery influences faster or slower recovery of patients undergoing vestibular schwannoma surgery. The Dizziness Handicap Inventory (DHI) is a good index to show the recovery of patients as it relates directly to an improvement or not of the subjective visual vertical (SVV). Objective: To evaluate the process of recovery of patients as measured by the SVV and the DHI after surgical removal of vestibular schwannoma. Methods: We studied 24 consecutive patients of the University Hospital of Salamanca who underwent vestibular schwannoma surgery. We assessed age, tumour size, degree of canalicular weakness and preoperative SVV, and their relationship with DHI and SVV at discharge and also at 1, 3 and 6 months postoperatively. Results: Patients with lesser degrees of caloric weakness took longer to normalize SVV than those with a higher caloric weakness before surgery (p &lt; 0.05). There was a significant correlation between DHI and improvements in SVV with time. The differences disappeared in 6 months where all patients, with greater or lesser degree of caloric weakness, had the same results.
Autores: Manrique, Raquel; Picciafuoco, S.; Cervera, Francisco Javier; et al.
Revista: EUROPEAN ARCHIVES OF OTO-RHINO-LARYNGOLOGY
ISSN 0937-4477  Vol. 270   Nº 1  2013  págs. 45 - 52
The purpose of this study is to determine if surgical approach to the inner ear is feasible without generating a hearing loss in an animal model. Five Macaca fascicularis were used as experimental animals and followed up for 27 months. Mastoidectomy, posterior tympanotomy and promontorial cochleostomy were performed on four specimens and one specimen was kept as control animal. Before and after drilling and exposing the endosteal layer and the membranous labyrinth, otoacustic emissions (dPOAE) and auditory brainstem responses (ABR) were used to test hearing. In vivo experimental studies prove it is reliable to expose the membranous labyrinth without causing hearing loss. dPOAE were present after 3, 6, 12, 24 and 26 months of follow-up. Regarding the ABR results from the four M. fascicularis in which a cochleostomy has been carried out, auditory thresholds are within the 20-30 dB interval at 27 months of follow-up. Experimental studies support clinical experiences indicating it is feasible to surgically approach the membranous labyrinth of the cochlea without damaging its hearing function.
Autores: Marques, PS ; Pérez-Fernandez, Nicolás;
Revista: ACTA OTO-LARYNGOLOGICA
ISSN 0001-6489  Vol. 132  Nº 5  2012  págs. 498-504
Autores: Pérez-Fernandez, Nicolás; et al.
Revista: ACTA OTORRINOLARINGOLOGICA ESPAÑOLA
ISSN 0001-6519  Vol. 63  Nº 6  2012  págs. 429-435
Introduction: The assessment of the vestibulo-ocular reflex (VOR) is one of the main steps in clinically evaluating patients with dizziness. It can be performed at the bedside with common head-impulse test in which eye position is analysed at the end of the head-thrust. It is an important test due to its high specificity but low sensitivity. Material and Methods: We studied 179 patients with different types of balance- affecting disorders. The results were analysed in contingency tables. The clinical test was classified as normal or abnormal according to the absence or existence, respectively, of fixation saccades once the head-thrust was ended. The video head-impulse test (vHIT) was classified according to vestibulo-ocular reflex (VOR) gain and presence of fixation saccades. The speed of the slow phase of spontaneous nystagmus was also quantified, as well as the caloric test results. Results: There were significant differences (Chi-square test, P=0.00) for the findings in the clinical evaluation and with the vHIT: 32.1% of the tests performed yielded different findings in both tests. In the vHIT, the differences were due to the finding of normal gain with saccades; in these patients, the mean canal paresis was significantly abnormal: 39% ± 10%. Conclusions: The distribution of findings for the VOR bedside examination and for that with the help of a video system are significantly different; as such, the video head-impulse examination is not simply an added VOR detection and registration system. The difference relies mainly on a vHIT response characterised as of normal gain but with fixation saccades. These have been considered as the cause for the low sensitivity of the bedside VOR examination and sometimes regarded as normal responses; we have demonstrated that these findings are abnormal according to the findings of higher canal paresis in the caloric test.
Autores: Soto, Andres; Arán-González, Ismael,; López-Escamez, Antonio; et al.
Revista: ACTA OTORRINOLARINGOLOGICA ESPAÑOLA
ISSN 0001-6519  Vol. 63  Nº 2  2012  págs. 125 - 131
The current classification, with the criteria it includes, allows labelling with an acceptable consensus to only 62% of the patients. Therefore, a modification in the classification is proposed in relation with the probable BPPV epigraph, as well a revision of the entries for vertigo-migraine and vertigo associated with migraine
Autores: Manrique, Raquel; Pérez-Fernandez, Nicolás;
Revista: ACTA OTORRINOLARINGOLOGICA ESPAÑOLA
ISSN 0001-6519  Vol. 63  Nº 2  2012  págs. 120-4.
El temblor ortostático (TO) es una enfermedad neurológica de origen desconocido caracterizada por un temblor de 10-20Hz en las piernas en bipedestación. Se manifiesta por mareo e inestabilidad, que típicamente mejoran al apoyarse o sentarse y la ingesta de pequeñas cantidades de alcohol lo reduce de manera significativa. Se muestran 4 casos clínicos atendidos en nuestra consulta cuyo diagnóstico sugiere ser el de TO. Consideramos que ante un paciente con inestabilidad, es preciso plantearse como diagnóstico diferencial un TO. La historia clínica nos orienta hacia esta entidad y en caso de sospecha, el diagnóstico definitivo viene dado por el registro de la electromiografía en las extremidades inferiores en condición de reposo sentado y en ortostatismo donde se registra un temblor de 10-20Hz. El tratamiento es médico y, se emplea el clonazepam como primera opción terapéutica.
Autores: Rey, Jorge Alberto; Pérez-Fernandez, Nicolás; et al.
Revista: Acta Otorrinolaringológica Española
ISSN 0001-6519  Vol. 62  Nº 2  2011  págs. 126 - 131
Autores: Cervera, Francisco Javier; Salvador, Francisco Javier; et al.
Revista: REVUE DE LARYNGOLOGIE - OTOLOGIE - RHINOLOGIE
ISSN 0035-1334  Vol. 132  Nº 3  2011  págs. 153-155.
The treatment of patients with idiopathic sudden sensorineural hearing loss must be performed as an emergency measure in order to prevent long term hearing deficit. Steroids in monotherapy provide the best outcome. There is some controversy regarding the most efficient route but in order to prevent side effects, intratympanic treatment is the preferred choice, especially in diabetic patients. We here present the case of a patient that developed hyperglycemia after systemic and intratympanic dexamethasone treatment for sudden hearing loss. We conclude that after intratympanic treatment great caution must be taken.
Autores: Guillén, Francisco; Pérez-Fernandez, Nicolás;
Revista: LARYNGOSCOPE
ISSN 0023-852X  Vol. 121  Nº 8  2011  págs. 1810 - 1817
We have identified four distinct profiles of patients with definite Menière's disease that we consider as "mildly active elderly," "mildly active young," "active compensated," and "active uncompensated." We have demonstrated that only in a restricted popu
Autores: Manrique, Raquel; Guillén, Francisco; Pérez-Fernandez, Nicolás;
Revista: Otology & Neurotology
ISSN 1531-7129  Vol. 32  Nº 3  2011  págs. 4661 - 4665
Autores: Gonzalez-del Pino, Beatriz; Femia, Paola; Pérez-Fernandez, Nicolás;
Revista: Acta Otorrinolaringológica Española
ISSN 0001-6519  Vol. 62  Nº 5  2011  págs. 385 - 391
Autores: Femia, Paola; Gonzalez del Pino, Beatriz; Pérez-Fernandez, Nicolás;
Revista: Acta Otorrinolaringológica Española
ISSN 0001-6519  Vol. 62  Nº 4  2011  págs. 311 - 317
Autores: Eza Nuñez, P; Manrique, Manuel Jesús; Pérez-Fernandez, Nicolás;
Revista: REVUE DE LARYNGOLOGIE - OTOLOGIE - RHINOLOGIE
ISSN 0035-1334  Vol. 131  Nº 3  2010  págs. 199 - 206
Objective: The objective of this study was to identify patients with otosclerosis and to characterize its clinical presentation among patients examined at our hospital with vertigo as the primary and most distressing symptom. Study Design: Retrospective chart review. Setting: Tertiary medical center. Patients: This study involved 40 patients suffering from dizziness and diagnosed with otosclerosis. Methods: At inclusion, the clinical status, as well as auditory (pure tone hearing level and speech audiometry, impedancemetry) and vestibular function (bedside, nystagmography, caloric test and rotator chair testing) were assessed. The results were analyzed using parametric and non-parametric tests, and the chi2 test. Results: The clinical presentation was diverse: 12 patients with Menière's syndrome (30%); 11 patients with spontaneous recurrent vertigo without hearing fluctuation (27.5%); 13 patients with positional vertigo (32.5%); 3 patients with chronic unrelapsing imbalance (7.5%); and 1 patient with acute unilateral vestibulopathy (2.5%). There was a lag between the detection of hearing loss and the beginning of vertigo attacks or imbalance in all patients. When measured through bone conduction, hearing loss was significantly different in patients with Menière's disease, spontaneous recurrent vertigo and positional vertigo. Conclusions: Dizziness, although frequent in patients with otosclerosis is rarely a cause for specific clinical assessment. There is a lag between the patient's perception of hearing loss and the initiation of vestibular symptoms, and it is not associated with any specific clinical disorder Otosclerosis can be found as any one of the most common vestibular disorders and in general, vestibular function tests reveal a more severe vestibular dysfunction than in the idiopathic forms. Level Of Evidence: 2A.
Autores: Pérez-Fernandez, Nicolás; Cervera, Francisco Javier; et al.
Revista: AUDIOL NEURO-OTOL
ISSN 1420-3030  Vol. 15  Nº 6  2010  págs. 399 - 406
Autores: Doménech-Vadillo , E; Rey, Jorge; et al.
Revista: Acta Otorrinolaringológica Española
ISSN 0001-6519  Vol. 61  Nº 1  2010  págs. 34 - 40
Introduction: The Sensory Organization Test of dynamic posturography allows a reliable assessment of the ability of any given patient to maintain a correct stability when conditions in the visual surrounding and/or support surface are deliberately modified. The results of this test can be analyzed according to the norms of the manufacturer of the device or through the application of specific formulae such as those by Cevette. Objectives: To evaluate if the Cevette formulae distinguish correctly between the normal and vestibular patterns, as well as observing the differences between these two groups of patients (normal and vestibular), obtained either through standardized calculation or by the Cevette formulae. The work has been restricted to patients diagnosed with unilateral Menière's disease who presented an active form of the disease and who had not suffered a recent crisis. Material and Methods: 63 patients were studied who fulfilled the inclusion criteria for this study. A clinical and instrumental audio-vestibular study was carried out. The results of the sensory organization test were analyzed according to the pattern offered by the device and through the application of the Cevette formulae. Results: In 63 patients the pattern obtained was normal or vestibular. In 41 the pattern obtained through one system of analysis or the other coincided but in 22 they did not. The analysis of patients using the Cevette formulae offers a higher capacity for clinical discrimination but is not sensitive to the bias introduced by age; however, combined with the classification offered by the device, it manages to differentiate two populations (normal and vestibular) with a very good audio-vestibular correlation. Conclusion: The combined assessment of the results of the sensory organization test using both the equipment analysis and the Cevette formulae provides much better and real information of clinical differences amongst patients with Menière's disease when the result is normal or of vestibular deficiency.
Autores: Fernández, Secundino; Guillén, Francisco; et al.
Revista: AURIS NASUS LARYNX
ISSN 0385-8146  Vol. 37  Nº 4  2010  págs. 409 - 414
Objective: To evaluate the value of different variables of the clinical history, auditory and vestibular tests and handicap measurements to define intractable or disabling Meniere's disease. Methods: This is a prospective study with 212 patients of which 155 were treated with intratympanic gentamicin and considered to be suffering a medically intractable Meniere's disease. Age and sex adjustments were performed with the 11 variables selected. Discriminant analysis was performed either using the aforementioned variables or following the stepwise method. Results: Different variables needed to be sex and/or age adjusted and both data were included in the discriminant function. Two different mathematical formulas were obtained and four models were analyzed. With the model selected, diagnostic accuracy is 77.7%, sensitivity is 94.9% and specificity is 52.8%. Conclusion: After discriminant analysis we found that the most informative variables were the number of vertigo spells, the speech discrimination score, the time constant of the VOR and a measure of handicap, the "dizziness index". (C) 2009 Elsevier Ireland Ltd. All rights reserved.
Autores: Pérez-Fernandez, Nicolás; Manrique, Raquel;
Libro:  Textbook of vertigo: diagnosis and management
2014  págs. 108 - 115
Autores: Pérez-Fernandez, Nicolás;
Libro:  Vértigo: valoración y tratamiento: rehabilitación vestibular
2010  págs. 51 - 56
Autores: Pérez-Fernandez, Nicolás;
Título: Faringoamigdalitis
Libro:  Claves prácticas para el uso racional de antibióticos
2010  págs. 29-34
Autores: Pérez-Fernandez, Nicolás;
Título: Vértigo visual
Libro:  Vértigo: Valoración y tratamiento. Rehabilitación vestibular
2010  págs. 177 - 182
Autores: Pérez-Fernandez, Nicolás;
Libro:  Vértigo: Valoración y tratamiento. Rehabilitación vestibular
2010  págs. 391 - 397
Autores: Candel, F. J.; De Miguel Díez, J.; Moya, M. S.; et al.
Título: Rinosinusitis
Libro:  Claves prácticas para el uso racional de antibióticos
2010  págs. 21 - 28
Autores: Pérez-Fernandez, Nicolás;
2012 
Autores: Candel, F. J.; De Miguel Díez, J.; Moya, M. S.; et al.
2010 
Autores: Pérez-Fernandez, Nicolás;
2010 
Autores: Barona, R., (Coordinador); Marco, J., (Coordinador); Pérez-Fernandez, Nicolás, (Coordinador)
2010 
Autores: Barona Guzman, R., (Editor); Marco Algarra J, (Editor); Pérez-Fernandez, Nicolás, (Editor)
2010