Biological Response Dynamics to Cochlear Implantation: Modeling and Modulating the Electrode-Tissue Interface.

OBJECTIVE: The present study primarily aims to study and model the impedance dynamics following cochlear implant (CI) surgery in humans. Secondarily, to observe how the modulation of a single-dose topic dexamethasone alters this response. DESIGN: CI impedance and impedance subcomponents were measured in a day-by-day basis between CI surgery and its activation ( 1 month). Impedance dynamics were mathematically modeled. Furthermore, we conducted a randomized double-blind placebo-controlled clinical trial to evaluate the effect of dexamethasone application. RESULTS: The model showed good fitting for all impedance's measures and both modulations over time. The clinical impedance and impedance subcomponents showed different patterns between groups during the first week postimplantation. Single-dose topical dexamethasone had a transient effect on Impedances, postponing (for 3 days) but not preventing the rise in impedance and its application was mainly effective at the base of the cochlea. CONCLUSIONS: The proposed mathematical fitting properly resembles the impedance dynamics in humans and their modulation due to the dexamethasone. The impedance subcomponents' dynamic pattern showed a time-course consistent with the biological processes of the foreign body reaction. Single-dose topic dexamethasone has a temporal reduction effect in impedance values on the basal turn of the cochlea but does not prevent the rise on the long-term.

Measuring the Electrical Status of the Bionic Ear. Re-thinking the Impedance in Cochlear Implants.

As in any biophysical electrode-tissue environment, impedance measurement shows a complex relationship which reflects the electrical characteristics of the medium. In cochlear implants (CIs), which is mostly a stimulation-oriented device, the actual clinical approach only considers one arbitrary time-measure of the impedance. However, to determine the main electrical properties of the cochlear medium, the overall impedance and its subcomponents (i.e., access resistance and polarization impedance) should be described. We here characterized, validated and discussed a novel method to calculate impedance subcomponents based on CI measurement capabilities. With an electronic circuit of the cochlear electrode-tissue interface and its computational simulation, the access resistance and polarization impedance were modeled. Values of each electrical component were estimated through a custom-made pulse delivery routine and the acquisition of multiple data points. Using CI hardware, results fell within the electronic components nominal errors (± 10%). Considering the method's accuracy and reliability, it is readily available to be applied in research-clinical use. In the man-machine nature of the CI, this represents the basis to optimize the communication between a CI electrode and the spiral ganglion cells.

Toward Self-Measures in Cochlear Implants: Daily and "Homemade" Impedance Assessment.

Introduction: Cochlear implant (CI) impedance reflects the status of the electro neural interface, potentially acting as a biomarker for inner ear injury. Most impedance shifts are diagnosed retrospectively because they are only measured in clinical appointments, with unknown behavior between visits. Here we study the application and discuss the benefits of daily and remote impedance measures with software specifically designed for this purpose. Methods: We designed software to perform CI impedance measurements without the intervention of health personnel. Ten patients were recruited to self-measure impedance for 30 days at home, between CI surgery and activation. Data were transferred to a secured online server allowing remote monitoring. Results: Most subjects successfully performed measurements at home without supervision. Only a subset of measurements was missed due to lack of patient engagement. Data were successfully and securely transferred to the online server. No adverse events, pain, or discomfort was reported by participants. Discussion: This work overviews a flexible and highly configurable platform for self-measurement CI impedance. This novel approach simplifies the CI standard of care by reducing the number of clinical visits and by proving useful and constant information to CI clinicians.

In Vivo Real-time Remote Cochlear Implant Capacitive Impedance Measurements: A Glimpse Into the Implanted Inner Ear.

OBJECTIVES: To propose a remote, real-time, safe, and easy systematic method to determine electrode electric impedance components: access resistance, polarization capacitance, and polarization resistance. PATIENTS: Patients who received a cochlear implant and had normal cochlear anatomy and complete array insertion were recruited. A total of four adult patients were included and separated in two groups according to implantation time. INTERVENTION: Cochlear implant electrical impedance and its components were measured in all patients by using a novel diagnostic tool: a custom made software running in the patient's computer. Data is transmitted in real time to the investigator. Various stimulation and measuring strategies were used to obtain specific information in each cochlear region. MAIN OUTCOME MEASURES: Access resistance, polarization capacitance, and resistance of each patient were measured. Measurement success rate and required time for the patient were recorded. RESULTS: Access resistance, polarization capacitance, and resistance were obtained in different modes, thus in every specific region of the cochlea. All measurements were successful. Each measurement took approximately 7 minutes and was transmitted in real time to the investigators. CONCLUSION: Routine use of this tool may allow constant assessment of cochlear health and could be eventually used to monitor the effect of drugs in the inner ear. This methodology provides an in vivo "electrical view" of the inside of the implanted cochlea.

Competencias de los residentes de Atención Primaria en el manejo de los problemas prevalentes de oído, nariz y garganta / Competencies of Primary Care residents in the management of prevalent problems of the ear, nose and throat

Los problemas de oído, nariz y garganta son un motivo frecuente de consulta en Atención Primaria. Numerosos estudios han reportado que los médicos de Atención Primaria perciben una capacitación insuficiente en el manejo de estos problemas. El objetivo de este estudio fue evaluar las competencias en el diagnóstico y tratamiento de problemas prevalentes de Otorrinolaringología de médicos residentes de Atención Primaria en un hospital universitario, en Buenos Aires, Argentina, mediante la implementación de un examen clínico objetivo estructurado. Participaron 25 residentes, de Pediatría (7), de Medicina Interna (10) y de Medicina Familiar (8). Los de Medicina Familiar y Pediatría tuvieron mejor desempeño que los de Medicina Interna. Los residentes de Atención Primaria demostraron competencias disímiles en el manejo de problemas prevalentes de Otorrinolaringología. Se detectaron áreas de oportunidad de mejora comunes para los tres grupos, que proporcionaron dirección y motivación en futuros aprendizajes, tanto en conocimientos como en habilidades.

Ear, nose and throat problems are very common in Primary Care settings. Numerous studies have reported that Primary Care physicians feel dissatisfied with their performance and insufficient training to diagnose and manage these problems. The objective of this study was to assess the competency in diagnosis and management of prevalent ear, nose and throat problems in medical residents of Family Medicine, Internal Medicine and Pediatrics at a University Hospital in Buenos Aires, Argentina, using an Objective Structured Clinical Examination. The participants were 25 residents of Pediatrics (7), Internal Medicine (10) and Family Medicine (8). Residents of Family Medicine and Pediatrics showed better performance than residents of Internal Medicine. Residents of Primary Care demonstrated dissimilar competencies in the management of prevalent ear, nose and throat problems. Areas of common improvement opportunities were detected for the three groups, which provided direction and motivation in future learnings in both knowledge and skills.

[Competencies of Primary Care residents in the management of prevalent problems of the ear, nose and throat]. / Competencias de los residentes de Atención Primaria en el manejo de los problemas prevalentes de oído, nariz y garganta.

Ear, nose and throat problems are very common in Primary Care settings. Numerous studies have reported that Primary Care physicians feel dissatisfied with their performance and insufficient training to diagnose and manage these problems. The objective of this study was to assess the competency in diagnosis and management of prevalent ear, nose and throat problems in medical residents of Family Medicine, Internal Medicine and Pediatrics at a University Hospital in Buenos Aires, Argentina, using an Objective Structured Clinical Examination. The participants were 25 residents of Pediatrics (7), Internal Medicine (10) and Family Medicine (8). Residents of Family Medicine and Pediatrics showed better performance than residents of Internal Medicine. Residents of Primary Care demonstrated dissimilar competencies in the management of prevalent ear, nose and throat problems. Areas of common improvement opportunities were detected for the three groups, which provided direction and motivation in future learnings in both knowledge and skills.

Los problemas de oído, nariz y garganta son un motivo frecuente de consulta en Atención Primaria. Numerosos estudios han reportado que los médicos de Atención Primaria perciben una capacitación insuficiente en el manejo de estos problemas. El objetivo de este estudio fue evaluar las competencias en el diagnóstico y tratamiento de problemas prevalentes de Otorrinolaringología de médicos residentes de Atención Primaria en un hospital universitario, en Buenos Aires, Argentina, mediante la implementación de un examen clínico objetivo estructurado. Participaron 25 residentes, de Pediatría (7), de Medicina Interna (10) y de Medicina Familiar (8). Los de Medicina Familiar y Pediatría tuvieron mejor desempeño que los de Medicina Interna. Los residentes de Atención Primaria demostraron competencias disímiles en el manejo de problemas prevalentes de Otorrinolaringología. Se detectaron áreas de oportunidad de mejora comunes para los tres grupos, que proporcionaron dirección y motivación en futuros aprendizajes, tanto en conocimientos como en habilidades.

Implante coclear en paciente con síndrome de Q-T prolongado / Cochlear implantation in a patient with elongated Q-T syndrome / Implante coclear em paciente com síndrome de Q-T alongado

El síndrome de Q-T prolongado es una afección que se caracteriza por interrupción del ritmo cardíaco normal. Esta enfermedad es causada por mutación en genes que codifican los canales de voltaje de potasio o sodio, interrumpiendo de esta forma el flujo de dichos iones en el músculo cardíaco. En algunos casos este flujo iónico también se encuentra alterado a nivel del oído interno, por lo cual puede encontrarse asociado a hipoacusia neurosensorial profunda. El diagnóstico se basa en la electrocardiografía y el cuadro clínico, caracterizado por ataques sincopales recurrentes, crisis convulsivas o muerte súbita como primera manifestación. En los casos asociados a hipoacusia neurosensorial profunda, el implante coclear como tratamiento de la sordera presenta riesgos adicionales debido a la posibilidad de arritmias cardíacas y muerte súbita; por lo cual existen consideraciones perioperatorias especiales.

Prolonged Q-T syndrome is a condition characterized by disruption of normal heart rhythm, presented as a prolonged QT interval. This disease is caused by mutation in genes encoding the potassium or sodium voltage channels, thus disrupting the flow of such ions into the cardiac muscle. In some cases this inonic flow is also altered at the level of the inner ear, which may be associated with deep neurosensorial hearing loss. The diagnosis is based on electrocardiography and the clinical picture, characterized by recurrent syncopal attacks, seizures or sudden death as the first manifestation. In cases associated with deep neurosensory hearing loss, the cochlear implant as a treatment for deafness presents additional risks due to the possibility of cardiac arrhythmias and sudden death; for which there are special peri-operative considerations.

Síndrome Q-T prolongada é uma condição caracterizada por uma ruptura do ritmo cardíaco normal, apresentado como um intervalo prolongado de QT. Esta doença é causada por mutação em genes que codificam os canais de tensão de potássio ou de sódio, interrompendo assim o fluxo de tais íons para o músculo cardíaco. Em alguns casos, este fluxo inônico também é alterado no nível da orelha interna, o que pode estar associado à perda auditiva neurosensorial profunda. O diagnóstico é baseado em eletrocardiografia e no quadro clínico, caracterizado por ataques de síncopes recorrentes, convulsões ou morte súbita como a primeira manifestação. Nos casos associados à perda auditiva neurosensorial profunda, o implante coclear como tratamento para surdez apresenta riscos adicionais devido à possibilidade de arritmias cardíacas e morte súbita; para o qual há considerações perioperatórias especiais

Medición de impedancias in-vivo durante la cirugía de implante coclear como predictor de la posición de los electrodos dentro de la cóclea / Impedance measures during in-vivo cochlear implantation predict array positioning / Medição das impedâncias in-vivo durante a cirurgia de implante coclear como preditor da posição dos eletrodos no interior da cóclea

INTRODUCCIÓN: Los implantes cocleares son dispositivos protésicos neuronales utilizados para el tratamiento de las hipoacusias neurosensoriales severas a profundas. La activación de electrodos estimula las células del ganglio espiral y las vías nerviosas. Una estimulación más discreta de subpoblaciones neuronales se puede obtener cuando los electrodos están más cerca de las células ganglionares en la pared del modiolo. La distancia del electrodo al modiolo podría ser una de las múltiples variables que influyen en el resultado del paciente con un implante coclear. Actualmente no hay un protocolo establecido para medir esta distancia. Mediante diversas técnicas de imágenes se puede determinar la posición de la guía de electrodos dentro de la cóclea. La tomografía computada cone beam ha sido validada como una herramienta útil para evaluar la posición de los electrodos luego de la implantación. Tykocinski et al. describieron un modelo de la interfase electrodo-electrolito del implante coclear como una resistencia y un condensador en paralelo, y la resistencia del tejido circundante como una resistencia en serie. Realizando un registro detallado de la forma de la curva de voltaje, los datos pueden usarse para calcular la impedancia clínica o total, la resistencia de acceso, la impedancia de polarización y sus subcomponentes: Resistencia de polarización y capacitancia de polarización. El objetivo de este estudio es determinar si la distancia electrodo modiolar de cada uno de los electrodos podría predecirse a partir de mediciones de impedancia...

INTRODUCTION: Cochlear implants are neuronal prosthetic devices used for the treatment of severe to profound sensorineural hearing loss. The activation of electrodes stimulates spiral ganglion cells and nerve pathways. A more discrete stimulation of neuronal subpopulations can be obtained when the electrodes are closer to the ganglion cells in the modiolus wall. The distance from the electrode to the modiolus could be one of the multiple variables that influence the outcome of the patient with a cochlear implant. Currently there is no established protocol to measure this distance. By means of various imaging techniques, the position of the electrode guide inside the cochlea can be determined. Cone beam computed tomography has been validated as a useful tool to evaluate the position of the electrodes after implantation. Tykocinski et al., described a model of the electrode-electrolyte interface of the cochlear implant as a resistance and a capacitor in parallel, and the resistance of the surrounding tissue as a series resistance. By making a detailed record of the shape of the voltage curve, the data can be used to calculate the clinical or total impedance, the access resistance, the polarization impedance and its subcomponents: polarization resistance and polarization capacitance. The objective of this study is to determine if the electrode distance modiolar of each of the electrodes could be predicted from impedance measurements…

INTRODUCÃO: Os implantes cocleares são dispositivos protéticos neuronais utilizados no tratamento da perda auditiva neurossensorial severa a profunda. A ativação de eletrodos estimula as células ganglionares espirais e as vias nervosas. Uma estimulação mais discreta de subpopulações neuronais pode ser obtida quando os eletrodos estão mais próximos das células ganglionares na parede do modíolo. A distância do eletrodo ao modíolo pode ser uma das múltiplas variáveis que influenciam o resultado do paciente com implante coclear. Atualmente não há protocolo estabelecido para medir essa distância. Por meio de várias técnicas de imagem, a posição do guia do eletrodo dentro da cóclea pode ser determinada. A tomografia computadorizada por feixe cônico foi validada como uma ferramenta útil para avaliar a posição dos eletrodos após o implante. Tykocinski et al. Descreveu um modelo da interface eletrodo-eletrólito do implante coclear como uma resistência e um capacitor em paralelo, e a resistência do tecido circundante como uma resistência em série. Realizando um registo detalhado da forma da curva de tensão, os dados podem ser usados para calcular a impedância clínico ou total, a resistência de acesso, a impedância de polarização e seus subcomponentes: resistência de polarização e capacitância de polarização. O objetivo deste estudo é determinar se a distância modiolar do eletrodo de cada um dos eletrodos poderia ser prevista a partir de medidas de impedância...

Real-Time Intracochlear Electrocochleography Obtained Directly Through a Cochlear Implant.

HYPOTHESIS: Utilizing the cochlear implant to record electrophysiologic responses during device placement is a feasible and efficacious technique for monitoring near real-time cochlear physiology during and following electrode insertion. BACKGROUND: Minimizing intracochlear trauma during cochlear implantation has emerged as a highly researched area to help improve patient performance. Currently, conventional cochlear implant technology allows for the recording of electrically evoked compound action potentials (eCAPs). Acoustically evoked potentials may be more sensitive in detecting physiologic changes occurring as a result of electrode insertion. Electrocochleography obtained from within the cochlea allows hair cell and neural response monitoring along the cochlear spiral at locations where changes most likely would occur. METHODS: Intracochlear electrocochleography (ECochG) was recorded from the cochlear implant during surgery in 14 subjects. A long acquisition time (54.5 ms), capable of measuring potentials from the low frequency-serving apical region of the cochlea (125 and 500 Hz) was employed. Two distinct intracochlear processing methods were used and compared in obtaining electrophysiologic data. RESULTS: Measureable intracochlear ECochG responses were obtained from all 14 participants. The 1st harmonic distortions (cochlear microphonic and auditory nerve neurophonic) generally increased steadily with electrode insertion. Electrode and frequency scan following insertion revealed that response amplitude varied based on location of recording electrode and frequency of stimulation. Exquisite sensitivity to manipulation during round window muscle packing was demonstrated. CONCLUSION: Intracochlear ECochG recorded from the electrode array of the cochlear implant is a highly feasible technique that sheds light on cochlear micromechanics during cochlear implant electrode placement.

3D Printed Models and Navigation for Skull Base Surgery: Case Report and Virtual Validation.

In recent years, computer-assisted surgery tools have become more versatile. Having access to a 3D printed model expands the possibility for surgeons to practice with the particular anatomy of a patient before surgery and improve their skills. Optical navigation is capable of guiding a surgeon according to a previously defined plan. These methods improve accuracy and safety at the moment of executing the operation. We intend to carry on a validation process for computed-assisted tools. The aim of this project is to propose a comparative validation method to enable physicians to evaluate differences between a virtual planned approach trajectory and a real executed course. Summarily, this project is focused on decoding data in order to obtain numerical values so as to establish the quality of surgical procedures.

Linfoma de amígdala en niño con asimetría tonsilar. caso clínico / Palatine tonsil lymphoma in children with tonsillar asymmetry. Case report

El tumor maligno de amígdalas es poco frecuente en niños. La asimetría amigdalina es, generalmente, secundaria a un proceso benigno, ya sea patología inflamatoria, diferencia en la profundidad de la fosa tonsilar o asimetría del pilar anterior. Sin embargo, puede indicar un trastorno subyacente grave, como el linfoma. El linfoma es el tumor maligno infantil más común en la cabeza y el cuello. En el 15% de los casos, afecta al anillo de Waldeyer. Las manifestaciones clínicas más comunes del linfoma de la amígdala palatina son la hipertrofia amigdalina unilateral, la alteración en la apariencia de la mucosa y la adenopatía cervical ipsilateral. El diagnóstico precoz y el tratamiento adecuado son de gran importancia en el pronóstico. Presentamos un caso de linfoma amigdalino en un niño con asimetría amigdalina y destacamos la importancia del examen de la cavidad oral y del cuello para identificar alteraciones sospechosas de linfoma tonsilar.

Tonsil malignancy is uncommon in children. Tonsillar asymmetry is usually secondary to a benign process, either inflammatory conditions, differences in the tonsillar fossa depth or anterior pillar asymmetry. However, it may indicate a serious underlying disorder such as lymphoma. Lymphoma is the most common childhood malignancy in the head and neck. Approximately, 15% of the cases affect the Waldeyer's ring. The most common clinical manifestations of palatine tonsils lymphoma are unilateral tonsillar hypertrophy, alteration in the appearance of the mucosa and ipsilateral cervical lymphadenopathy. Early diagnosis and appropriate treatment are of great importance in the prognosis. We present a case of palatine tonsil lymphoma in a child with tonsillar asymmetry and we emphasize the importance of the examination of the oral cavity and the neck to identify suspicious alterations compatible with tonsillar lymphoma.

Linfoma de amígdala en niño con asimetría tonsilar. caso clínico / Palatine tonsil lymphoma in children with tonsillar asymmetry. Case report

El tumor maligno de amígdalas es poco frecuente en niños. La asimetría amigdalina es, generalmente, secundaria a un proceso benigno, ya sea patología inflamatoria, diferencia en la profundidad de la fosa tonsilar o asimetría del pilar anterior. Sin embargo, puede indicar un trastorno subyacente grave, como el linfoma. El linfoma es el tumor maligno infantil más común en la cabeza y el cuello. En el 15% de los casos, afecta al anillo de Waldeyer. Las manifestaciones clínicas más comunes del linfoma de la amígdala palatina son la hipertrofia amigdalina unilateral, la alteración en la apariencia de la mucosa y la adenopatía cervical ipsilateral. El diagnóstico precoz y el tratamiento adecuado son de gran importancia en el pronóstico. Presentamos un caso de linfoma amigdalino en un niño con asimetría amigdalina y destacamos la importancia del examen de la cavidad oral y del cuello para identificar alteraciones sospechosas de linfoma tonsilar.(AU)

Tonsil malignancy is uncommon in children. Tonsillar asymmetry is usually secondary to a benign process, either inflammatory conditions, differences in the tonsillar fossa depth or anterior pillar asymmetry. However, it may indicate a serious underlying disorder such as lymphoma. Lymphoma is the most common childhood malignancy in the head and neck. Approximately, 15% of the cases affect the Waldeyers ring. The most common clinical manifestations of palatine tonsils lymphoma are unilateral tonsillar hypertrophy, alteration in the appearance of the mucosa and ipsilateral cervical lymphadenopathy. Early diagnosis and appropriate treatment are of great importance in the prognosis. We present a case of palatine tonsil lymphoma in a child with tonsillar asymmetry and we emphasize the importance of the examination of the oral cavity and the neck to identify suspicious alterations compatible with tonsillar lymphoma.(AU)

[Palatine tonsil lymphoma in children with tonsillar asymmetry. Case report]. / Linfoma de amígdala en niño con asimetría tonsilar. caso clínico.

Tonsil malignancy is uncommon in children. Tonsillar asymmetry is usually secondary to a benign process, either inflammatory conditions, differences in the tonsillar fossa depth or anterior pillar asymmetry. However, it may indicate a serious underlying disorder such as lymphoma. Lymphoma is the most common childhood malignancy in the head and neck. Approximately, 15% of the cases affect the Waldeyer's ring. The most common clinical manifestations of palatine tonsils lymphoma are unilateral tonsillar hypertrophy, alteration in the appearance of the mucosa and ipsilateral cervical lymphadenopathy. Early diagnosis and appropriate treatment are of great importance in the prognosis. We present a case of palatine tonsil lymphoma in a child with tonsillar asymmetry and we emphasize the importance of the examination of the oral cavity and the neck to identify suspicious alterations compatible with tonsillar lymphoma.

Cirugía transoral robótica en otorrinolaringología / Transoral robotic surgery in otolaryngology

La cirugía robótica constituye uno de los avances más novedosos de la medicina de las últimas décadas y el que ha sido más beneficioso para los pacientes. Su aporte fue fundamental para diferentes procedimientos quirúrgicos, al agilizar la cirugía y aumentar su precisión. Actualmente, su utilización en las diferentes especialidades médicas, como la cirugía de cabeza y cuello, permite realizar abordajes mínimamente invasivos, evitando las grandes incisiones externas y reduciendo de esta manera la morbilidad y el tiempo de internación. (AU)

Robotic surgery is one of the advances of medicine in recent decade that has been more novel and beneficial to patients. Its contribution was very important to different surgical procedures, decreasing surgical time and increasing its accuracy. Currently, its use in different medical specialties, such as head and neck surgery, allows minimally invasive approaches, avoiding large external incisions, thereby reducing morbidity and length of stay. (AU)

[Hemoptysis in a child with cervical and pulmonary arteriovenous malformation. Case report]. / Hemoptisis en un niño con malformación arteriovenosa cervical y pulmonary. Caso clínico.

Hemoptysis is the expectoration of blood from the subglottic airway. The main causes in children are infections of the lower respiratory tract and aspiration of foreign bodies. Pulmonary arteriovenous malformation is a rare etiology of hemoptysis, which involves abnormal communication between the arterial and venous system. Most vascular malformations are present at birth and enlarge proportionately with the growth of the child. Signs and symptoms include dyspnea, exercise intolerance, cyanosis and hemorrhagic or neurologic complications. We describe the clinical manifestations, diagnostic methods and treatment of a child with this disease. We emphasize the importance of efficient systematic evaluation in every child with hemoptysis to identify the underlying etiology, since immediate treatment is essential because of the potential severity of this condition.

Hemoptisis en un niño con malformación arteriovenosa cervical y pulmonar: Caso clínico / Hemoptysis in a child with cervical and pulmonary arteriovenous malformation: Case report

La hemoptisis es la expectoración de sangre proveniente de la vía aérea subglótica. Las causas principales en la infancia son las infecciones de la vía respiratoria inferior y la aspiración de cuerpos extraños. Una etiología rara de hemoptisis es la malformación arteriovenosa pulmonar, que consiste en la comunicación anormal entre el sistema arterial y venoso. La mayoría de las malformaciones vasculares están presentes desde el nacimiento y aumentan de tamaño proporcionalmente al crecimiento del niño. Los signos y síntomas de presentación incluyen la disnea, la intolerancia al ejercicio, la cianosis y las complicaciones hemorrágicas o neurológicas. Describimos las manifestaciones clínicas, los métodos diagnósticos y el tratamiento de un niño con esta patología. Destacamos la importancia de la evaluación sistemática eficiente en todo niño con hemoptisis para identificar la etiología subyacente; el tratamiento inmediato es fundamental debido a la gravedad potencial de esta condición.

Hemoptysis is the expectoration of blood from the subglottic airway. The main causes in children are infections of the lower respiratory tract and aspiration of foreign bodies. Pulmonary arteriovenous malformation is a rare etiology of hemoptysis, which involves abnormal communication between the arterial and venous system. Most vascular malformations are present at birth and enlarge proportionately with the growth of the child. Signs and symptoms include dyspnea, exercise intolerance, cyanosis and hemorrhagic or neurologic complications. We describe the clinical manifestations, diagnostic methods and treatment of a child with this disease. We emphasize the importance of efficient systematic evaluation in every child with hemoptysis to identify the underlying etiology, since immediate treatment is essential because of the potential severity of this condition.

Hemoptisis en un niño con malformación arteriovenosa cervical y pulmonar: Caso clínico / Hemoptysis in a child with cervical and pulmonary arteriovenous malformation: Case report

La hemoptisis es la expectoración de sangre proveniente de la vía aérea subglótica. Las causas principales en la infancia son las infecciones de la vía respiratoria inferior y la aspiración de cuerpos extraños. Una etiología rara de hemoptisis es la malformación arteriovenosa pulmonar, que consiste en la comunicación anormal entre el sistema arterial y venoso. La mayoría de las malformaciones vasculares están presentes desde el nacimiento y aumentan de tamaño proporcionalmente al crecimiento del niño. Los signos y síntomas de presentación incluyen la disnea, la intolerancia al ejercicio, la cianosis y las complicaciones hemorrágicas o neurológicas. Describimos las manifestaciones clínicas, los métodos diagnósticos y el tratamiento de un niño con esta patología. Destacamos la importancia de la evaluación sistemática eficiente en todo niño con hemoptisis para identificar la etiología subyacente; el tratamiento inmediato es fundamental debido a la gravedad potencial de esta condición.(AU)

Hemoptysis is the expectoration of blood from the subglottic airway. The main causes in children are infections of the lower respiratory tract and aspiration of foreign bodies. Pulmonary arteriovenous malformation is a rare etiology of hemoptysis, which involves abnormal communication between the arterial and venous system. Most vascular malformations are present at birth and enlarge proportionately with the growth of the child. Signs and symptoms include dyspnea, exercise intolerance, cyanosis and hemorrhagic or neurologic complications. We describe the clinical manifestations, diagnostic methods and treatment of a child with this disease. We emphasize the importance of efficient systematic evaluation in every child with hemoptysis to identify the underlying etiology, since immediate treatment is essential because of the potential severity of this condition.(AU)

Hemoptisis en un niño con malformación arteriovenosa cervical y pulmonar: Caso clínico / Hemoptysis in a child with cervical and pulmonary arteriovenous malformation: Case report

La hemoptisis es la expectoración de sangre proveniente de la vía aérea subglótica. Las causas principales en la infancia son las infecciones de la vía respiratoria inferior y la aspiración de cuerpos extraños. Una etiología rara de hemoptisis es la malformación arteriovenosa pulmonar, que consiste en la comunicación anormal entre el sistema arterial y venoso. La mayoría de las malformaciones vasculares están presentes desde el nacimiento y aumentan de tamaño proporcionalmente al crecimiento del niño. Los signos y síntomas de presentación incluyen la disnea, la intolerancia al ejercicio, la cianosis y las complicaciones hemorrágicas o neurológicas. Describimos las manifestaciones clínicas, los métodos diagnósticos y el tratamiento de un niño con esta patología. Destacamos la importancia de la evaluación sistemática eficiente en todo niño con hemoptisis para identificar la etiología subyacente; el tratamiento inmediato es fundamental debido a la gravedad potencial de esta condición.(AU)

Hemoptysis is the expectoration of blood from the subglottic airway. The main causes in children are infections of the lower respiratory tract and aspiration of foreign bodies. Pulmonary arteriovenous malformation is a rare etiology of hemoptysis, which involves abnormal communication between the arterial and venous system. Most vascular malformations are present at birth and enlarge proportionately with the growth of the child. Signs and symptoms include dyspnea, exercise intolerance, cyanosis and hemorrhagic or neurologic complications. We describe the clinical manifestations, diagnostic methods and treatment of a child with this disease. We emphasize the importance of efficient systematic evaluation in every child with hemoptysis to identify the underlying etiology, since immediate treatment is essential because of the potential severity of this condition.(AU)

Factores morfogenéticos del síndrome de apneas obstructivas del sueño en niños / Morphogenetic factors of obstructive sleep apnea syndrome in children / Fatores morfogenéticos da síndrome de apnéia obstrutiva do sonoem crianças

En la expresión del síndrome de apneas obstructivas del sueño están involucrados múltiples genes que interaccionan a su vez con múltiples factores ambientales. Los genes candidatos para este síndrome son diferentes según los diversos grupos étnicos e incluyen fundamentalmente genes que participan en la distribución de la grasa corporal, en la anatomía cráneo-facial y de la vía aérea y en el control ventilatorio. Describimos los factores genéticos que influyen en la predisposición al síndrome de apneas obstructivas del sueño en niños.

Multiple genes that interact with multiple environmental factors are involved in the expression of obstructive sleep apnea syndrome. Candidate genes for this syndrome vary according to ethnicity and major genes include those related to the distribution of body fat, the craniofacial´s andairway´s anatomy and the ventilatory control. We describe genetic factors that influence susceptibility to obstructive sleep apnea syndrome in children.

Vários genes que interagem com múltiplos fatores ambientais estão envolvidos na expressão da síndrome de apnéia obstrutiva do sono.Os genes candidatos para esta síndrome são diferentes de acordo com os diferentes grupos étnicos e incluem, principalmente, os genes envolvidos na distribuição de gordura corporal, a anatomia cranio faciale das vias aéreas e controle ventilatório.Nós descrevemos os fatores genéticos que influenciam a susceptibilidade a síndrome da apnéia do sono em crianças.

Hemoptisis en un niño con malformación arteriovenosa cervical y pulmonary. Caso clínico. / [Hemoptysis in a child with cervical and pulmonary arteriovenous malformation. Case report].

Hemoptysis is the expectoration of blood from the subglottic airway. The main causes in children are infections of the lower respiratory tract and aspiration of foreign bodies. Pulmonary arteriovenous malformation is a rare etiology of hemoptysis, which involves abnormal communication between the arterial and venous system. Most vascular malformations are present at birth and enlarge proportionately with the growth of the child. Signs and symptoms include dyspnea, exercise intolerance, cyanosis and hemorrhagic or neurologic complications. We describe the clinical manifestations, diagnostic methods and treatment of a child with this disease. We emphasize the importance of efficient systematic evaluation in every child with hemoptysis to identify the underlying etiology, since immediate treatment is essential because of the potential severity of this condition.