Incidence and prognosis of olfactory and gustatory dysfunctions related to infection of SARS-CoV-2 Omicron strain: a national multi-center survey of 35 566 population / 中华耳鼻咽喉头颈外科杂志

Objective: This cross-sectional investigation aimed to determine the incidence, clinical characteristics, prognosis, and related risk factors of olfactory and gustatory dysfunctions related to infection with the SARS-CoV-2 Omicron strain in mainland China. Methods: Data of patients with SARS-CoV-2 from December 28, 2022, to February 21, 2023, were collected through online and offline questionnaires from 45 tertiary hospitals and one center for disease control and prevention in mainland China. The questionnaire included demographic information, previous health history, smoking and alcohol drinking, SARS-CoV-2 vaccination, olfactory and gustatory function before and after infection, other symptoms after infection, as well as the duration and improvement of olfactory and gustatory dysfunction. The self-reported olfactory and gustatory functions of patients were evaluated using the Olfactory VAS scale and Gustatory VAS scale. Results: A total of 35 566 valid questionnaires were obtained, revealing a high incidence of olfactory and taste dysfunctions related to infection with the SARS-CoV-2 Omicron strain (67.75%). Females(χ2=367.013, P<0.001) and young people(χ2=120.210, P<0.001) were more likely to develop these dysfunctions. Gender(OR=1.564, 95%CI: 1.487-1.645), SARS-CoV-2 vaccination status (OR=1.334, 95%CI: 1.164-1.530), oral health status (OR=0.881, 95%CI: 0.839-0.926), smoking history (OR=1.152, 95%CI=1.080-1.229), and drinking history (OR=0.854, 95%CI: 0.785-0.928) were correlated with the occurrence of olfactory and taste dysfunctions related to SARS-CoV-2(above P<0.001). 44.62% (4 391/9 840) of the patients who had not recovered their sense of smell and taste also suffered from nasal congestion, runny nose, and 32.62% (3 210/9 840) suffered from dry mouth and sore throat. The improvement of olfactory and taste functions was correlated with the persistence of accompanying symptoms(χ2=10.873, P=0.001). The average score of olfactory and taste VAS scale was 8.41 and 8.51 respectively before SARS-CoV-2 infection, but decreased to3.69 and 4.29 respectively after SARS-CoV-2 infection, and recovered to 5.83and 6.55 respectively at the time of the survey. The median duration of olfactory and gustatory dysfunctions was 15 days and 12 days, respectively, with 0.5% (121/24 096) of patients experiencing these dysfunctions for more than 28 days. The overall self-reported improvement rate of smell and taste dysfunctions was 59.16% (14 256/24 096). Gender(OR=0.893, 95%CI: 0.839-0.951), SARS-CoV-2 vaccination status (OR=1.334, 95%CI: 1.164-1.530), history of head and facial trauma(OR=1.180, 95%CI: 1.036-1.344, P=0.013), nose (OR=1.104, 95%CI: 1.042-1.171, P=0.001) and oral (OR=1.162, 95%CI: 1.096-1.233) health status, smoking history(OR=0.765, 95%CI: 0.709-0.825), and the persistence of accompanying symptoms (OR=0.359, 95%CI: 0.332-0.388) were correlated with the recovery of olfactory and taste dysfunctions related to SARS-CoV-2 (above P<0.001 except for the indicated values). Conclusion: The incidence of olfactory and taste dysfunctions related to infection with the SARS-CoV-2 Omicron strain is high in mainland China, with females and young people more likely to develop these dysfunctions. Active and effective intervention measures may be required for cases that persist for a long time. The recovery of olfactory and taste functions is influenced by several factors, including gender, SARS-CoV-2 vaccination status, history of head and facial trauma, nasal and oral health status, smoking history, and persistence of accompanying symptoms.

A prospective study of the effect of functional endoscopic sinus surgery on the recovery of olfactory function in patients with chronic rhinosinusitis with nasal polyposis / 临床耳鼻咽喉头颈外科杂志

Objective:To investigate the efficacy of functional endoscopic sinus surgery（FESS） in the treatment of olfactory dysfunction in patients with chronic rhinosinusitis with nasal polyps （CRSwNP） , at the same time, it provides an evidence for the prognosis evaluation of olfaction and the clinical application of oERPs to evaluate the plasticity of olfaction cortex. Methods:From October 2021 to October 2022, 45 patients with CRSwNP who underwent FESS nine-step standardized treatment in our department were recruited as the research subjects, divided into 22 patients with eosinophilic CRSwNP（ECRS）and 23 patients with non-eosinophilic CRSwNP（nECRS）. VAS-olfactory dysfunction （VAS-OD） score, SNOT-22 olfactory score, Sniffin' Sticks test and oERPs collection and processing were performed before the operation. All items were evaluated again 3 months after the operation. Results:VAS-OD and SNOT-22 olfactory score were significantly lower in all CRSwNP patients after the operation than those before the operation[F（1, 43） =357.429, P<0.001; F（1, 43） =185.657, P<0.001], the scores of T, D, I and TDI scores in Sniffin' Sticks test were significantly higher than those before the operation[F（1, 43） =126.302, P<0.001; F（1, 43） =311.301, P<0.001; F（1, 43） =131.401, P<0.001; F（1, 43） =295.885, P<0.001]; The decrease of VAS-OD and SNOT-22 olfactory score in the ECRS group was smaller than that in the nECRS group[F（1, 43） =4.825, P=0.033; F（1, 43） =9.916, P=0.003], T, D and TDI scores were significantly lower in nECRS group than those in nECRS group[F（1, 43） =6.719, P=0.013; F（1, 43） =4.890, P=0.032; F（1, 43） =4.469, P=0.040]; There was a positive correlation between preoperative eosinophil-to-lymphocyte ratio（ELR） and SNOT-22 olfactory score and how much it changes（r=0.455, P=0.002; r=-0.414, P=0.005）, a negative correlation between T, TDI score and how much they change respectively（r=-0.431, P=0.003; r=-0.385, P=0.009; r=-0.383, P=0.010; r=-0.316, P=0.035）. The latency of P3 was significantly shorter after operation than that before operation in all CRSwNP patients[F（1, 14） =24.840, P<0.001], however, the amplitude has no significant surgical effect. Conclusion:FESS could significantly improve the olfactory function of CRSwNP patients, while changes in plasticity may occur in the olfactory cortex. In addition, the preoperative peripheral blood eosinophil granulocyte level can predict the postoperative olfactory improvement.

Development of an olfactory epithelial organoid culture system based on small molecule screening / 生物工程学报

Olfactory epithelium, which detects and transmits odor signals, is critical for the function of olfactory system. Olfactory epithelium is able to recover spontaneously after injury under normal circumstances, but this ability is dampened in certain diseases or senility, which causes olfactory dysfunction. The olfactory epithelium consists of basal cells, sustentacular cells and olfactory sensory neurons. In order to develop an olfactory epithelial organoid containing multiple olfactory cell types in vitro, we used three-dimensional culture model and small molecules screening. This organoid system consists of horizontal basal-like cells, globose basal-like cells, sustentacular-like cells and olfactory sensory neurons-like cells. Through statistical analysis of clone diameter, immunofluorescence staining and qPCR detection of the expression level of related marker genes. We identified a series of growth factors and small molecule compounds that affected the proliferation, composition and gene expression of the organoids. CHIR-99021, an activator of Wnt signaling pathway, increased the colony formation and proliferation rate of olfactory epithelial organoids and the expression level of marker genes of olfactory sensory neurons-like cells. In addition, each factor in the culture system increased the proportion of c-Kit-positive globose basal-like cell colonies in organoids. Moreover, EGF and vitamin C were both beneficial to the expression of horizontal basal-like cell marker genes in organoids. The established olfactory epithelial organoid system mimicked the process of olfactory epithelial stem cells differentiating into various olfactory epithelial cell types, thus providing a research model for studying olfactory epithelial tissue regeneration, the pathological mechanism of olfactory dysfunction and drug screening for olfactory dysfunction treatment.

Effects of moxa smoke through olfactory pathway on learning and memory ability in rapid aging mice / 中国针灸

OBJECTIVE@#To observe the effects of moxa smoke through olfactory pathway on learning and memory ability in rapid aging (SAMP8) mice, and to explore the action pathway of moxa smoke.@*METHODS@#Forty-eight six-month-old male SAMP8 mice were randomly divided into a model group, an olfactory dysfunction group, a moxa smoke group and an olfactory dysfunction + moxa smoke group, with 12 mice in each group. Twelve age-matched male SAMR1 mice were used as the blank group. The olfactory dysfunction model was induced in the olfactory dysfunction group and the olfactory dysfunction + moxa smoke group by intraperitoneal injection of 3-methylindole (3-MI) with 300 mg/kg, and the moxa smoke group and the olfactory dysfunction + moxa smoke group were intervened with moxa smoke at a concentration of 10-15 mg/m3 for 30 min per day, with a total of 6 interventions per week. After 6 weeks, the emotion and cognitive function of mice was tested by open field test and Morris water maze test, and the neuronal morphology in the CAI area of the hippocampus was observed by HE staining. The contents of neurotransmitters (glutamic acid [Glu], gamma-aminobutyric acid [GABA], dopamine [DA], and 5-hydroxytryptamine [5-HT]) in hippocampal tissue of mice were detected by ELISA.@*RESULTS@#The mice in the blank group, the model group and the moxa smoke group could find the buried food pellets within 300 s, while the mice in the olfactory dysfunction group and the olfactory dysfunction + moxa smoke group took more than 300 s to find them. Compared with the blank group, the model group had increased vertical and horizontal movements (P<0.05) and reduced central area residence time (P<0.05) in the open field test, prolonged mean escape latency on days 1-4 (P<0.05), and decreased search time, swimming distance and swimming distance ratio in the target quadrant of the Morris water maze test, and decreased GABA, DA and 5-HT contents (P<0.05, P<0.01) and increased Glu content (P<0.05) in hippocampal tissue. Compared with the model group, the olfactory dysfunction group had increased vertical movements (P<0.05), reduced central area residence time (P<0.05), and increased DA content in hippocampal tissue (P<0.05); the olfactory dysfunction + moxa smoke group had shortened mean escape latency on days 3 and 4 of the Morris water maze test (P<0.05) and increased DA content in hippocampal tissue (P<0.05); the moxa smoke group had prolonged search time in the target quadrant (P<0.05) and increased swimming distance ratio, and increased DA and 5-HT contents in hippocampal tissue (P<0.05, P<0.01) and decreased Glu content in hippocampal tissue (P<0.05). Compared with the olfactory dysfunction group, the olfactory dysfunction + moxa smoke group showed a shortened mean escape latency on day 4 of the Morris water maze test (P<0.05). Compared with the moxa smoke group, the olfactory dysfunction + moxa smoke group had a decreased 5-HT content in the hippocampus (P<0.05). Compared with the blank group, the model group showed a reduced number of neurons in the CA1 area of the hippocampus with a disordered arrangement; the olfactory dysfunction group had similar neuronal morphology in the CA1 area of the hippocampus to the model group. Compared with the model group, the moxa smoke group had an increased number of neurons in the CA1 area of the hippocampus that were more densely packed. Compared with the moxa smoke group, the olfactory dysfunction + moxa smoke group had a reduced number of neurons in the CA1 area of the hippocampus, with the extent between that of the moxa smoke group and the olfactory dysfunction group.@*CONCLUSION@#The moxa smoke could regulate the contents of neurotransmitters Glu, DA and 5-HT in hippocampal tissue through olfactory pathway to improve the learning and memory ability of SAMP8 mice, and the olfactory is not the only effective pathway.

Evaluación del olfato en pacientes operados por adenoma hipofisario con acceso transesfenoidal en el Instituto de Neurocirugía Dr. Asenjo / Olfactory evaluation in patients operated for pituitary adenoma with transsphenoidal access at the Instituto de Neurocirugía Dr. Asenjo

Introducción: El olfato tiene una gran importancia en la calidad de vida. Los accesos quirúrgicos selares pueden realizarse por vía transcraneal, transeptal y transnasal, y pueden generar hiposmia al incluir resecciones que afectan a la mucosa olfatoria. Objetivo: Determinar la existencia de alteración persistente en el olfato ocasionado por los accesos quirúrgicos transeptal y transnasal en pacientes operados por adenoma hipofisiario en el Instituto de Neurocirugía Dr. Asenjo. Material y Método: Estudio prospectivo de cohorte con comparación de resultados olfatorios ("sniffin' sticks" versión extendida) y encuesta SNOT-22 pre y poscirugía por adenoma hipofisiario por vía transeptal o transnasal. Se utilizaron medidas estadísticas de comparación de pruebas pareadas paramétricas y no paramétricas según las características de las variables evaluadas. Resultados: Se reclutaron 60 pacientes, completando el seguimiento 39. En 21 se realizó acceso transeptal y en 18 transnasal. Al analizar el total de pacientes y por cada técnica quirúrgica, no hubo diferencias significativas en los puntajes del "sniffin' sticks" versión extendida y tampoco en SNOT-22. Conclusión: La literatura describe incidencia de hiposmia posoperatoria muy variable, entre 0% y 88%, con mediciones subjetivas y objetivas. Existe una predilección por la técnica endoscópica a nivel internacional, por lo que cuenta con estudios de mejor calidad. A nivel nacional existen dos estudios previos que han encontrado tasas de hiposmia posoperatoria de 10% y 14%. En este estudio no hubo diferencias significativas en los puntajes obtenidos en la prueba de olfato entre el pre y posoperatorio.

Introduction: Olfaction is of great importance in quality of life. Surgical accesses to the sellar region can be performed by transcranial, transseptal, and transnasal routes, which can generate hyposmia when including resections that affect the olfactory mucosa. Aim: To determine the existence of persistent alteration in olfaction caused by transseptal and transnasal surgical accesses in patients operated for pituitary adenoma at the Instituto de Neurocirugía Dr. Asenjo. Material and Method: Prospective cohort study with comparison of olfactory results ("sniffin' sticks" extended version) and SNOT-22 survey pre and post transseptal or transnasal surgery for pituitary adenoma. Parametric and non-parametric paired test comparison statistics were used according to the characteristics of the variables evaluated. Results: 60 patients were recruited and 39 completed follow-up. 21 patients underwent transseptal access and 18 underwent transnasal access. When analyzing the total number of patients and for each surgical technique, there were no significant differences in the scores obtained in the "sniffin' sticks" extended version and neither for the SNOT-22. Conclusion: The literature describes a highly variable incidence of postoperative hyposmia, between 0% and 88%, with subjective and objective measurements. There is a predilection for the endoscopic technique at an international level, which is why it has better quality studies. At the national level there are two previous studies that have found postoperative hyposmia rates of 10% and 14%. In this study there were no significant differences in the scores obtained between pre and postoperative olfaction test.

Subjective assessment of taste and smell disfunction in patients with COVID-19 in Paraguay / Evaluación subjetiva de las alteraciones del sentido del gusto y del olfato en pacientes con COVID-19 en Paraguay

The alteration of the senses of taste and smell in relation to COVID-19 is a widely known phenomenon; however, this alteration has not been exhaustively characterized in the international literature. The following study is proposed with the aim of describing the alterations in the senses of taste and smell in relation to COVID-19 by means of their subjective evaluation. The nature of the study is observational, descriptive and cross-sectional, and was applied to patients who sought medical attention via remote consultations carried out on virtual platforms of the Service of Otorhinolaryngology and Head and Neck Surgery of the Clínicas Hospital, San Lorenzo, between the months of March and October of 2021. We included 440 patients aged 31.3 ± 9.9 years (18 to 60 years), 308 (70%) female, 388 (88%) from urban areas, with evidence of infection by SARS-CoV-2 by RT-PCR in 260 (59%), predominantly without comorbidities 232 (53%), with fever as the most frequently reported symptom 352 (80%), treated more frequently with NSAIDs 208 (47%) and/or Paracetamol 216 (49%). Both taste and smell alterations in patients who have had COVID-19 have been shown to appear more frequently 1 to 7 days after the onset of symptoms (207 for smell, 184 for taste), occurring more frequently with a total decrease of both senses (anosmia 302 and ageusia 216), recovering completely in most cases (214 and 216) and within a period of 1 to 4 weeks (140 and 130).

La alteración de los sentidos del gusto y del olfato en relación con el COVID-19 es un fenómeno ampliamente conocido, sin embargo, esta alteración no ha sido caracterizada de forma exhaustiva en la literatura internacional. Se plantea el siguiente estudio con el objetivo de describir las alteraciones del sentido del gusto y del olfato en relación con el COVID-19 a través de la evaluación subjetiva del mismo. El mismo es observacional, descriptivo, de corte transversal, aplicado a pacientes que consultaron a través de teleconsultas realizadas sobre plataformas virtuales de la Cátedra y Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello del Hospital de Clínicas, de San Lorenzo, durante los meses de marzo a octubre del 2021. Fueron incluidos 440 pacientes de 31,3 ± 9,9 años (18 a 60 años), 308 (70%) de sexo femenino, 388 (88%) provenientes de zona urbana, con evidencia de infección por SARS-CoV-2 por RT-PCR en 260 (59%), predominantemente sin comorbilidades 232 (53%), con fiebre como síntoma asociado al COVID-19 más frecuentemente reportado 352 (80%), tratados más frecuentemente con AINES 208 (47%) y/o Paracetamol 216 (49%). Tanto la alteración del gusto como del olfato en pacientes que han cursado con COVID-19 ha demostrado ser aparecer más frecuentemente en 1 a 7 días del inicio del cuadro (207 para el olfato. 184 para el gusto), cursando más frecuentemente con disminución total de ambos sentidos (anosmia 302 y ageusia 216), recuperándose más frecuentemente de forma total (214 y 216) y en un plazo de 1 a 4 semanas (140 y 130).

Olfactory nerve: from ugly duckling to swan / Nervo olfatório: de patinho feio a cisne

ABSTRACT Background: The olfactory nerve has never been the shining star of neurological examination. Quite the contrary, examining the first cranial nerve is often an overlooked step. As cases of anosmia secondary to COVID-19 infection continue to rise, the 2020 pandemic has shed new light on this much-forgotten nerve, its value as an aid to diagnosis of several diseases and its central role in our daily lives. Objective: We aimed to emphasize how essential and simple clinical examination of the olfactory system can be by highlighting practical techniques and clinical tips for its assessment. We also share pearls and pitfalls in localization and differential diagnosis, which may prove valuable to busy clinicians. Methods: A broad review of the literature was conducted by searching PubMed, Cochrane and Google Scholar for articles and books containing topics regarding examination of the olfactory nerve and its anatomy, physiology and pathology. No particular inclusion or exclusion criteria were used. Results: Forty different works were found, between books and articles, from which 20 were selected after careful analysis. Conclusions: Despite the tragedy and adversity that followed the COVID-19 pandemic, its legacy has taught us a crystal-clear lesson: olfaction should no longer be neglected in clinical practice.

RESUMO Antecedentes: O nervo olfatório nunca foi a estrela do exame neurológico. Pelo contrário, o exame desse nervo craniano é um passo frequentemente ignorado. No entanto, o aumento exponencial de casos de anosmia secundária a COVID-19 o colocou sob os holofotes, tanto em relação á sua função para o ser humano em sociedade, como seu papel no auxílio do diagnóstico de diversas patologias. Objetivos: Enfatizar quão importante é examinar o nervo olfatório e compreender as desordens do seu sistema. Ressaltamos pérolas clínicas e erros comuns no exame deste nervo, além dicas que possam auxiliar no diagnóstico de uma série de doenças neurológicas e sistêmicas. Métodos: Uma ampla revisão da literatura foi conduzida por meio de busca no PubMed, Cochrane e Google Acadêmico por artigos e livros relacionados aos tópicos do exame físico, fisiologia, anatomia e patologia do nervo olfatório. Não foram utilizados critérios específicos de inclusão ou exclusão. Resultados: Foram encontrados 40 artigos itens relacionados na língua inglesa, dentre os quais livros e artigos, tendo sido analisados e selecionados um a um até o total de 20 referências. Conclusões: Apesar da tragédia e adversidade trazidas pela pandemia de COVID-19, uma lição clara permanece: o olfato não deve mais ser negligenciado na prática clínica.

Quality of life among SARS-CoV-2 (COVID-19) positive patients with anosmia using the short version questionnaire of olfactory disorders - Negative statements translated in Filipino (sQOD-NS Ph)

@#<p><strong>Objective:</strong> To determine the quality of life among SARS-CoV-2 (COVID-19) positive patients with anosmia using the Short Version Questionnaire of Olfactory Disorders - Negative Statements translated in Filipino (sQOD-NS Ph).</p><p><strong>Methods: </strong><strong>Design:</strong> Cross-Sectional Study</p><p><strong>                 Setting:</strong> Tertiary Government Training Hospital</p><p><strong>                 Participants:</strong> SARS-CoV-2 (COVID-19) RT-PCR positive patients aged 18 years old and above with COVID-19 symptoms and anosmia in a tertiary government hospital who consulted from March 2020 to August 2021 answered the short version of sQOD-NS Ph.</p><p><strong>Results:</strong> Out of 108 participants with positive SARS-CoV-2 (COVID-19) RT-PCR test, 72 (66%) presented with anosmia, and sQOD-NS Ph scores ranged from 1 to 21 with a mean of 14.78. Thirty two (44%) encountered problems in eating while 21 (29%) had feelings of isolation due to loss of smell. There was an inverse correlation of -0.478 between recovery time of olfaction and QoL score, hence the longer the recovery time, the lower the QoL score, while the shorter the recovery time, the higher the QoL score (p < .0001).</p><p><strong>Conclusion:</strong> Majority of COVID-19 patients with anosmia had mild or negligible impairment, while a small percentage had impaired quality of life. The low percentage may be due to high number of patients who may have recovered their sense of smell along the course of the disease.</p>

Características y prevalencia de las alteraciones del olfato y el gusto en pacientes con infección por COVID-19 / Characteristics of smell and taste alteration in patients with COVID-19

Introducción: La identificación de los síntomas o sus combinaciones con un alto valor predictivo para la enfermedad, es una estrategia crucial para el control de las enfermedades transmisibles. Las alteraciones en el olfato y el gusto han surgido como síntomas de alta prevalencia y un confiable predictor temprano de la enfermedad. El objetivo de este estudio fue caracterizar la prevalencia de las alteraciones del gusto y del olfato en pacientes con antecedente de infección por SARS-CoV-2 en la población colombiana. Materiales y métodos: estudio descriptivo de corte transversal. Se realizó una encuesta telefónica y electrónica a pacientes adultos con antecedente de infección por SARS-CoV-2 confirmado por PCR. Resultados: se incluyeron 182 pacientes en el estudio. El 59% manifestó alteraciones del olfato y 54% alteraciones del gusto. De estos, el 77% y 82%, respectivamente, presentaron mejoría de sus síntomas. El 14% de los participantes percibió las alteraciones del olfato antes del inicio de otros síntomas de COVID-19. El 9% reportó que la alteración del olfato fue el único síntoma de la infección. Para el gusto, 8% informó que fue el primer síntoma de COVID-19, mientras que el 6% reportó que fue el único síntoma. Conclusiones: las alteraciones del gusto y del olfato son síntomas de alta prevalencia en pacientes con infección por COVID-19 y en algunos casos pueden ser el síntoma de presentación de la infección o el único síntoma de la infección

Introduction: Identifying symptoms or symptom combinations with a high predictive value for diagnosing a disease is a crucial strategy for controlling transmissible diseases. Smell and taste alterations have been identified as highly prevalent symptoms of COVID-19 and have been used as a reliable early predictor of the disease. The objective in this study was characterizing the prevalence of smell and taste alterations in patients with COVID-19 in the Colombian population. Materials and methods: Cross-sectional, descriptive study. A telephonic and electronic survey was applied to adult patients with SARS-CoV-2 infection confirmed by PCR. Results: 182 patients were included. 59% presented with smell alterations and 54% with taste symptoms. Among these patients, 77% and 82% respectively perceived symptomatic improvement. 14% of patients presented smell alterations before the onset of other COVID-19 symptoms. 9% reported smell alterations to be the only symptom of the disease. 8% of patients perceived taste alterations as a first symptom and 6% reported it to be the only symptom of the disease. Conclusion: Taste and smell alterations are highly prevalent symptoms in Colombian patients with Covid-19 and in some cases they can be the either the first or the only perceived symptoms of the disease.

Diagnóstico clínico y tratamiento de la disfunción olfatoria relacionada con COVID-19: revisión de la literatura / Clinical diagnosis and treatment of olfactory dysfunction related to COVID-19: A literature review

Introducción: la enfermedad por coronavirus 2019 (COVID-19) es una enfermedad pandémica, que ha causado más de seis millones de muertes en todo el mundo. El cuadro clínico de la infección puede variar en función de la gravedad de la enfermedad y suele incluir síntomas generales, otorrinolaringológicos y neurológicos. Objetivo: proporcionar una revisión narrativa de la literatura científica sobre el diagnóstico clínico y tratamiento de la disfunción olfatoria relacionada con COVID-19. Resultados: la disfunción olfatoria definida como la capacidad reducida o distorsionada de oler al inhalar (olfato ortonasal) o al comer (olfato retronasal), a menudo se informa en casos leves o incluso asintomáticos. La prevalencia de la disfunción olfatoria puede variar con respecto al entorno clínico, con tasas de pérdida total del olfato hasta del 70 % en pacientes con COVID-19 leve. Además, hasta la fecha existen pocos artículos que evalúen prospectivamente las tasas de recuperación de la disfunción olfatoria en pacientes con COVID-19. Conclusión: COVID-19 se asocia con disfunción olfatoria en diversos pacientes. Se requiere una investigación activa y colaborativa para delinear la historia natural y el manejo apropiado de la disfunción olfatoria en esta virulenta enfermedad. Mientras tanto, el diagnóstico y los tratamientos dirigidos como el entrenamiento olfatorio pueden ser útiles en la disfunción olfatoria relacionada con COVID-19.

Introduction: Coronavirus disease 2019 is a pandemic disease that has caused more than six million deaths worldwide. The clinical picture of the infection can vary depending on the severity of the disease and usually includes general, ENT and neurological symptoms. Objective: To provide a narrative review of the scientific literature on the clinical diagnosis and treatment of olfactory dysfunction related to coronavirus disease 2019. Results: Olfactory dysfunction defined as the reduced or distorted ability to smell when inhaling (orthonasal smell) or when eating (postnasal smell), is often reported in mild or even asymptomatic cases. The prevalence of olfactory dysfunction can vary with respect to the clinical setting, with rates of total loss of smell as high as 70% in patients with mild coronavirus disease 2019. In addition, to date there is a paucity of articles prospectively evaluating recovery rates of olfactory dysfunction in patients with coronavirus disease 2019. Conclusion: Coronavirus disease 2019 is associated with olfactory dysfunction in various patients. Active and collaborative research is required to delineate the natural history and appropriate management of olfactory dysfunction in this virulent disease. In the meantime, diagnosis and targeted treatments such as olfactory training may be helpful in olfactory dysfunction related to coronavirus disease 2019.

Síntomas otorrinolaringológicos asociados con infección positiva de SARS-CoV-2 confirmada con RT-PCR: un estudio de casos y controles en Colombia / Otolaryngological symptoms associated with positive RT-PCR SARS-CoV-2 infection: a case-control study in Colombia

Introducción: las alteraciones otorrinolaringológicas en pacientes con COVID-19 tienen particular importancia a nivel mundial. Sin embargo, todavía no hay consenso en la literatura acerca de la epidemiología, la gravedad y el tiempo de recuperación de estos trastornos. Objetivo: este estudio tiene como objetivo evaluar la asociación entre los síntomas otorrinolaringológicos y la positividad del SARS-CoV-2 confirmada mediante la reacción en cadena de la polimerasa de transcripción inversa (RT-PCR), así como la gravedad, duración y recuperación de estos síntomas en pacientes de la Fundación Santa Fe de Bogotá, un hospital de referencia de COVID-19 en Bogotá, Colombia. Métodos: estudio observacional, prospectivo, tipo casos y controles, realizado entre el 9 de octubre de 2020 y el 14 de enero de 2021. Los casos incluyeron adultos que obtuvieron una prueba positiva para el SARS-CoV-2 mediante RT-PCR. Los casos se emparejaron en una proporción de 2:1 con adultos sintomáticos seleccionados al azar con una prueba negativa, o con pacientes prequirúrgicos. Resultados: se incluyeron 130 casos y 253 controles entre los 10.004 pacientes sometidos a la prueba del SARS-CoV-2. La edad media era de 41,8 años (desviación estándar [DE]: 16,3). Los síntomas otorrinolaringológicos asociados a la positividad al SARS-CoV-2 fueron anosmia/hiposmia (adjusted odds ratio [aOR]: 5,82; intervalo de confianza [IC] del 95 %: 1,92-17,68), disgeusia/hipogeusia (aOR: 9,09; IC del 95 %: 2,86-28,92) y tos seca (aOR: 3,18; IC del 95 %: 1,56-6,48). La duración media de la anosmia/hiposmia y de la disgeusia/hipogeusia en los pacientes con SARS-CoV-2 positivos fue de 14,5 días y 15 días (rango intercuartílico [IQR]: 8-27), respectivamente. Hasta el 70,3 % y el 67,5 % de la población informó de una recuperación completa de la anosmia/hiposmia y la disgeusia/hipogeusia. En cuanto a la gravedad de los síntomas de anosmia/hiposmia y disgeusia/hipogeusia, el 62,1 % y el 65,4 % de la población positiva para SARS-CoV-2 los clasificó como graves. Sin embargo, solo el 6,1 % de ellos recibió tratamiento para estos síntomas. Conclusiones: los síntomas otorrinolaringológicos asociados con la positividad para SARS-CoV-2 son útiles para orientar el diagnóstico, pero establecer sus características clínicas también es esencial para un tratamiento adecuado.

Introduction: Otolaryngological disorders in COVID-19 patients have drawn attention worldwide. However, there is still no consensus regarding the prevalence, severity or recovery of these disorders. This study aimed to assess the association between otolaryngological symptoms and SARS-CoV-2 positivity confirmed by RT-PCR, as well as the severity, duration, and recovery of these symptoms in patients receiving care at Fundación Santa Fe de Bogotá, a COVID-19 referral hospital in Bogotá, Colombia. Methods: Observational, analytic, prospective, case-control study conducted between October 9, 2020, and January 14, 2021. Cases included adults who tested positive for SARS-CoV-2 by reverse transcription-polymerase chain reaction (RT-PCR). Cases were matched in a 2:1 ratio with randomly selected symptomatic adults with a negative test, or patients awaiting surgery. Results: Of 10004 patients tested for SARS-CoV-2, 130 cases and 253 controls were included. The mean age was 41.8 years (standard deviation [SD]: 16.3). The otolaryngological symptoms associated with SARS-CoV-2 positivity were anosmia/hyposmia (adjusted odds ratio [aOR]: 5.82; 95% confidence interval [CI]: 1.92-17.68), dysgeusia/ hypogeusia (aOR: 9.09; 95% CI: 2.86-28.92), and dry cough (aOR: 3.18; 95% CI: 1.56-6.48). The median duration of anosmia/hyposmia and dysgeusia/hypogeusia in SARS-CoV-2 positive patients was 14.5 days and 15 days (interquartile range [IQR]: 8-27), respectively. Up to 70.3% and 67.5% of the population reported a complete recovery of anosmia/hyposmia and dysgeusia/hypogeusia. Regarding the severity of anosmia/hyposmia and dysgeusia/hypogeusia symptoms, 62.1% and 65.4% of the SARS-CoV-2 positive population classified them as severe. However, only 6.1% of them received treatment for these symptoms. Conclusions: Otolaryngological symptoms associated with SARS-CoV-2 positivity are a useful guide to diagnosis, although adequate treatment also requires determination of their clinical characteristics.

Smell disorders evolution after chronic rhinosinusitis with polyps surgery

: The effects of chronic rhino sinusitis with polyps (CRSWP) surgery on smell symptoms have not been sufficiently studied. The aim of this study was to evaluate the impact of CRSWP surgery on smell symptoms over short and long-term follow-up and to identify the factors that might influence their evolution. Patients and methods: This was a retrospective study about 184 patients operated endoscopically for CRSWP. In post operative period, long-term local steroids were prescribed systematically. The sense of smell was evaluated preand post-operatively according to a subjective score (1: good smell, 2: hyposmia, 3: anosmia). Some factors, related to the patient, the CRSWP and the treatment, were tested in order to identify predictors of smell outcome after surgery.. Results: Before surgery, the anosmia and the hyposmia were noted in 90.8% and in 8.7% of cases, respectively. At six months after surgery, the improvement of olfactory score was significant: 84% of patient had the score 1 compared with 0.5% preoperatively (p < 0.0001). This improvement was maintained during the 2 first years and decreased significantly at 3 years, although an average delay of polyps recurrence was 23.4 months. Among the factors studied in our series, only the observance of postoperative corticosteroids was retained as a predictor of smell recovery after surgery (p = 0,011). Conclusion: CRSWP surgery can significantly improve the smell sense, especially during the two first years. This effect can be sustainable if good post operative compliance for local corticosteroid are achieved

Smell disorders evolution after chronic rhinosinusitis with polyps surgery

The effects of chronic rhino sinusitis with polyps (CRSWP) surgery on smell symptoms have not been sufficiently studied. The aim of this study was to evaluate the impact of CRSWP surgery on smell symptoms over short and long-term follow-up and to identify the factors that might influence their evolution. Patients and methods: This was a retrospective study about 184 patients operated endoscopically for CRSWP. In post operative period, long-term local steroids were prescribed systematically. The sense of smell was evaluated preand post-operatively according to a subjective score (1: good smell, 2: hyposmia, 3: anosmia). Some factors, related to the patient, the CRSWP and the treatment, were tested in order to identify predictors of smell outcome after surgery.. Results: Before surgery, the anosmia and the hyposmia were noted in 90.8% and in 8.7% of cases, respectively. At six months after surgery, the improvement of olfactory score was significant: 84% of patient had the score 1 compared with 0.5% preoperatively (p < 0.0001). This improvement was maintained during the 2 first years and decreased significantly at 3 years, although an average delay of polyps recurrence was 23.4 months. Among the factors studied in our series, only the observance of postoperative corticosteroids was retained as a predictor of smell recovery after surgery (p = 0,011). Conclusion: CRSWP surgery can significantly improve the smell sense, especially during the two first years. This effect can be sustainable if good post operative compliance for local corticosteroid are achieved.

Mobility impairment and life satisfaction in the Northern Region of Malawi

There exist many psychosocial sequelae associated with mobility impairment, especially in low-resource settings where access to mobility assistive devices is limited. Objectives: This study aims to (1) define the burden and presenting aetiologies of mobility impairment in the rural Northern Region of Malawi and (2) assess the relationship between physical disability, life satisfaction and access to mobility aids. Methods: At mobility device donation clinics throughout the Northern Region of Malawi, adults living with mobility impairment were surveyed with a demographic questionnaire and a series of validated surveys to assess their physical activity levels (Global Physical Activity Questionnaire [GPAQ]), degree of mobility impairment (Washington Group Extended Set Questions on Disability) and life satisfaction (patient-reported outcomes measurement information systems satisfaction with participation in social roles and general life satisfaction). Results: There were 251 participants who qualified for inclusion, of which 193 completed all surveys. Higher physical activity scores were positively correlated with increased life satisfaction: (1) satisfaction with participation in social roles (0.481, p < 0.0001) and (2) general life satisfaction (0.230, p < 0.001). Respondents who had previously used a formal mobility device reported 235.5% higher physical activity levels ([139.0%, 333.0%], p = 0.006), significantly higher satisfaction with participation in social roles ([0.21, 6.67], p = 0.037) and equivocally higher general life satisfaction ([−1.77, 3.84], p = 0.470). Conclusion: Disability and mental health do not exist in isolation from one another. Given the positive correlations between formal mobility device usage and both physical activity and life satisfaction, interventions that increase access to mobility-assistive devices in undertreated populations are imperative. Contribution: This study contributes to the understanding of the complex relationship between physical disability, access to mobility aids, and life satisfaction. Results from this study suggest the potential benefit that increasing access to mobility aids may have in improving the quality of life of mobility impaired persons in resource-limited settings, such as the Northern Region of Malawi

A Case Series of Olfactory Dysfunction in Imported COVID-19 Patients: A 12-Month Follow-Up Study / 生物医学与环境科学（英文）

Objective@#The scientific community knows little about the long-term influence of coronavirus disease 2019 (COVID-19) on olfactory dysfunction (OD). With the COVID-19 pandemic ongoing worldwide, the risk of imported cases remains high. In China, it is necessary to understand OD in imported cases.@*Methods@#A prospective follow-up design was adopted. A total of 11 self-reported patients with COVID-19 and OD from Xi'an No. 8 Hospital were followed between August 19, 2021, and December 12, 2021. Demographics, clinical characteristics, laboratory and radiological findings, and treatment outcomes were analyzed at admission. We surveyed the patients via telephone for recurrence and sequelae at the 1-, 6-, and 12-month follow-up.@*Results@#Eleven patients with OD were enrolled; of these, 54.5% (6/11) had hyposmia and 45.5% (5/11) had anosmia. 63.6% (7/11) reported OD before or on the day of admission as their initial symptom; of these, 42.9% (3/7) described OD as the only symptom. All patients in the study received combined treatment with traditional Chinese medicine and Western medicine, and 72.7% (8/11) had partially or fully recovered at discharge. In terms of OD recovery at the 12-month follow-up, 45.5% (5/11) reported at least one sequela, 81.8% (9/11) had recovered completely, 18.2% (2/11) had recovered partially, and there were no recurrent cases.@*Conclusions@#Our data revealed that OD frequently presented as the initial or even the only symptom among imported cases. Most OD improvements occurred in the first 2 weeks after onset, and patients with COVID-19 and OD had favorable treatment outcomes during long-term follow-up. A better understanding of the pathogenesis and appropriate treatment of OD is needed to guide clinicians in the care of these patients.

Evaluation of chemosensory function in patients with upper respiratory tract post-viral olfactory dysfunction / 中华耳鼻咽喉头颈外科杂志

Objective: To observe the changes of olfactory function, intranasal trigeminal nerve function and taste function in patients with upper respiratory tract post-viral olfactory dysfunction (PVOD), and to explore the correlation of chemosensory function. Methods: The clinical data of 42 patients with PVOD who visited to the Olfactory and Taste Center of Otorhinolaryngology Head and Neck Surgery Department of Beijing Anzhen Hospital from January to December of 2019 were analyzed retrospectively, including 20 males and 22 females, aging (48.86±11.47) years (x¯). Twenty subjects in normal control group were selected according to the sex ratio of PVOD patients. Sniffin' Sticks olfactory tests were performed on the subjects, including threshold test (T), discrimination test (D) and identification test (I), and the sum of the above three test scores was the TDI value. At the same time, olfactory event-related potentials (oERPs), trigeminal event-related potentials (tERPs) and taste function test were performed. According to the taste function test, the patients were divided into normal gustation (NG) group and gustatory dysfunction (GD) group. The results of olfaction, taste and intranasal trigeminal nerve function tests were compared among different groups, and the correlation analysis was carried out. SPSS statistical software was used for statistical analysis. Results: GD was present in 14 (33.3%) of 42 PVOD patients with a course of PVOD of 5 (3, 6) months (M (Q1, Q3)). The gustatory function of patients with PVOD was related to gender (r=0.565, P<0.001), smoking status (r=-0.512, P=0.001), duration (r=-0.357, P=0.020) and olfactory function (all P<0.05). The olfactory function of GD group was worse than that of NG group, and the differences of TDI value and T value between the two groups were statistically significant (10.25±4.58 vs 13.35±3.61, 1.54±0.66 vs 2.10±0.88, t value was 2.40 and 2.10 respectively, both P<0.05). The amplitudes of oERPs and tERPs were significantly lower in GD group than those in NG group (all P<0.05). Conclusion: In patients with PVOD, the subjective and objective olfactory function, intranasal trigeminal nerve function and taste function were decreased, and there was a correlation, suggesting that there was a synergistic effect between the chemosensory functions of PVOD patients.

Rehabilitación olfatoria en pacientes laringectomizados: maniobra de inducción del flujo aéreo nasal / Olfactory rehabilitation in laryngectomized patients: nasal airflow inducing maneuver

Resumen Introducción: La laringectomía total (LT) tiene como secuela la perdida de la voz, pero otra consecuencia no estudiada es la pérdida del olfato. Objetivo: Demostrar que la "maniobra de inducción del flujo aéreo nasal" (MIFAN) rehabilita el olfato en pacientes con LT. Material y Método: Estudio cuasiexperimental antes-después en pacientes laringectomizados por cáncer de laringe del Servicio de Otorrinolaringología del Hospital Barros Luco Trudeau (HBLT) de Santiago de Chile. Evaluación a través de encuesta, examen físico, nasofibroscopía y test olfatométrico. Pacientes con alteración del olfato por transmisión serán enrolados y se enseñará la MIFAN. Resultados: Se estudiaron 12 pacientes: 10 hombres, 2 mujeres. Edad promedio 66,3 años, todos autovalentes. 66,6% presentó anosmia y 33,3% hiposmia. Todos lograron realizar la maniobra. Posrehabilitación el 100% presentó presencia de olfato valorada por olfatometría. Población intervenida similar a otras series en cuanto a sexo y edad. La erigmofonación facilita la rehabilitación con MIFAN. La rehabilitación del olfato se logró en todos y paralelamente mejoró el sentido del gusto. Conclusión: La MIFAN es una técnica sencilla, barata y asequible para lograr rehabilitar el sentido del olfato en pacientes laringectomizados.

Abstract Introduction: Total laryngectomy (TL) has as a consequence the loss of voice, but another not studied consequence is the loss of smell. Aim: To demonstrate that the "nasal airflow inducing maneuver" (NAIM) rehabilitates smell in patients with TL. Material and Method: A quasi-experimental before-after study in laryngectomized patients for laryngeal cancer from the Otorhinolaryngology Service (ENT) of the Barros Luco Trudeau Hospital (BLTH) at Santiago, Chile. Evaluation through survey, physical examination, nasofibroscopy and olfactory test. Patients with transmission impairment of smell were enrolled and NAIM was performed. Results: 12 patients were studied: 10 men, 2 women. Average age 66.3 years. All self-supporting. 66.6% presented anosmia and 33.3% hyposmia. They all managed to perform the maneuver. Post-rehabilitation, 100% presented the presence of smell assessed by olfactometry. Intervened population similar to other series in terms of sex and age. Esophageal speech facilitates NAIM rehabilitation. Rehabilitation of smell was achieved in all of them and in parallel, the sense of taste improved. Conclusion: NAIM is a simple, cheap and affordable technique to rehabilitate the sense of smell in laryngectomized patients.

Possible effects of low testosterone levels on olfactory function in males / Possíveis efeitos dos baixos níveis de testosterona na função olfativa em homens

Abstract Introduction: Functions attributed to androgens have increased, ranging from the role in hypothalamic-pituitary-gonadal axis and reproductive behaviors to modulation of cognition, mood and some other functions. Sex differences and changes in circulating sex hormones affect human sensory function. In the literature, authors reported this kind of influence for olfaction predominantly in females. Objective: To investigate the effects of low testosterone levels on olfactory functions in males, in this prospective clinical study. Methods: Male patients diagnosed with prostate cancer were included. Thirty-nine patients with prostate cancer whose testosterone levels were lower than 50 ng/dL due to castration, were the study group. Thirty-one patients with prostate cancer who were not castrated with testosterone levels higher than 50 ng/dL were selected as the control group. Acoustic rhinometry and peak nasal inspiratory flow tests were performed for all participants; and for evaluation of olfactory function, both groups completed the Connecticut chemosensory clinical research center olfactory test. Results: The mean ages of the patients and controls were 69.6 ± 7.2 (57-89) and 66.3 ± 5.8 (50-78) years, respectively (= 0.039). There was a significant difference between groups in terms of testosterone levels (p < 0.0001). The multivariate logistic regression revealed testosterone level as the only predictive factor determining the difference between the groups. In terms of olfactory parameters, all scores were lower in the emasculated group (butanol threshold test p = 0.019, identification p = 0.059, and Connecticut center score p = 0.029) There was a significant correlation between testosterone levels and olfactory parameters (p = 0.023; p = 0.025 for identification and Connecticut center scores, respectively). Conclusion: Low testosterone levels in males have negative effects on olfactory functions. Further molecular research is required to understand the connection between testosterone and olfaction.

Resumo Introdução: As funções atribuídas aos andrógenos aumentaram, variam desde o papel no eixo hipotálamo-hipófise-gonadal e comportamentos reprodutivos até a modulação da cognição, humor e outras funções. As diferenças entre os sexos e as mudanças nos hormônios sexuais circulantes afetam a função sensorial humana. Na literatura, os autores relataram esse tipo de influência para o olfato, principalmente no sexo feminino. Objetivo: Investigar os efeitos dos baixos níveis de testosterona nas funções olfativas em homens, neste estudo clínico prospectivo. Método: Pacientes do sexo masculino com diagnóstico de câncer de próstata foram incluídos no estudo. Compreenderam o grupo de estudo 39 pacientes com câncer de próstata cujos níveis de testosterona eram inferiores a 50 ng/dL devido à castração. Foram determinados como grupo controle 31 pacientes com câncer de próstata que não foram emasculados, com níveis de testosterona superiores a 50 ng/dL. Testes de rinometria acústica e pico de fluxo inspiratório nasal foram feitos para todos os participantes; e para avaliação da função olfativa, ambos os grupos concluíram o teste olfativo do Connecticut chemosensory clinical research center. Resultados: A média da idade dos pacientes e controles foi de 69,6 ± 7,2 (57 ± 89) e 66,3 ± 5,8 (50 ± 78) anos, respectivamente (= 0,039). Houve uma diferença significante entre os grupos em relação a níveis de testosterona (p < 0,0001). A regressão logística multivariada revelou o nível de testosterona como o único fator preditivo que determinou a diferença entre os grupos. Em termos de parâmetros olfativos, todos os escores foram menores no grupo castrado (teste do limiar de butanol p = 0,019, identificação p = 0,059 e escore do Connecticut center p = 0,029). Houve uma correlação significante entre o nível de testosterona e os parâmetros olfativos (p = 0,023; p = 0,025 para identificação e escore do Connecticut center, respectivamente). Conclusão: Baixos níveis de testosterona em homens têm efeito negativo na função olfativa. Mais pesquisas moleculares são necessárias para entender a conexão entre testosterona e olfação.

Evaluation of the olfactory bulb volume and morphology in patients with coronavirus disease 2019: can differences create predisposition to anosmia?

SUMMARY OBJECTIVE: This study aimed to investigate whether the volume and morphology of the olfactory bulb are effective in the occurrence of anosmia in patients after COVID-19 infection. METHODS: The olfactory bulbus volume was calculated by examining the brain magnetic resonance imaging of cases with positive (+) COVID-19 polymerase chain reaction test with and without anosmia. Evaluated magnetic resonance imaging images were the scans of patients before they were infected with COVID-19. The olfactory bulbus and olfactory nerve morphology of these patients were examined. The brain magnetic resonance imaging of 59 patients with anosmia and 64 controls without anosmia was evaluated. The olfactory bulb volumes of both groups were calculated. The olfactory bulb morphology and olfactory nerve types were examined and compared between the two groups. RESULTS: The left and right olfactory bulb volumes were calculated for the anosmia group and control group as 47.8±15/49.3±14.3 and 50.5±9.9/50.9±9.6, respectively. There was no statistically significant difference between the two groups. When the olfactory bulb morphology was compared between the two groups, it was observed that types D and R were dominant in the anosmia group (p<0.05). Concerning olfactory nerve morphology, type N was significantly more common in the control group (p<0.05). CONCLUSIONS: According to our results, the olfactory bulb volume does not affect the development of anosmia after COVID-19. However, it is striking that the bulb morphology significantly differs between the patients with and without anosmia. It is clear that the evaluation of COVID-19-associated smell disorders requires studies with a larger number of patients and a clinicoradiological approach.