Disorders of smell and taste in COVID-19

Loss of smell is one of the symptoms most frequently reported by patients with COVID-19. Although the spontaneous cure rate is high, recent studies have shown that up to 7% of patients remain anosmic for more than 12 months after the onset of infection, leaving millions of people worldwide with severe olfactory dysfunction. Smell training is still the first recommended form of treatment. In view of the continued lack of approved drug treatment options, new therapeutic options are being explored. This article provides an overview of the current state of science on COVID-19-related olfactory disorders, with a focus on epidemiology, pathophysiology, cure rates, currently available treatments, and research into new treatments.

Longitudinal study of olfactory dysfunction among COVID-19 patients in a single tertiary centre in Malaysia

Aim: The aim of the study was to outline the longitudinal outcomes of olfactory dysfunction amongst patients with coronavirus disease 2019 (COVID-19) in a single tertiary centre in Malaysia. Material(s) and Method(s): Adults patients who tested positive for COVID-19 via reverse transcription-polymerase chain reaction and were admitted to Hospital Sungai Buloh, Malaysia, were recruited in this study. The patients completed a questionnaire via telephone interview comprising the following details: age, sex, ethnicity, comorbidities, general and otorhinolaryngological symptoms, and onset and duration of olfactory and gustatory dysfunction. The patients with persistent olfactory and gustatory dysfunction at the time of the initial interview were followed up every 3 to 5 days until resolution. Result(s): A total 185 patients were included in this study out of 378 patients contacted. Ninety patients reported olfactory dysfunction symptoms, with 59 of them complaining of anosmia. The mean age of the participants was 39.52 years (age range: 18-66 years). More than half of the patients with olfactory dysfunction had no comorbidities (55.56%). Of the 90 patients with olfactory dysfunction, 66 patients (73.3%), including 40 males and 26 females, regained their olfactory function completely within 2 weeks. The remaining 24 patients were contacted after 4, 8, and 12 weeks. Ten patients (11.1%) were found to have recovered their sense of smell after one month, while 5 patients (5.56%) recovered within 2 months, and 1 patient (1.11%) recovered in 3 months. Conclusion(s): Complete recovery was noted in 73% of the patients within a period of 2 weeks, whereas persistence of symptoms was noted in 6 patients (6.67%) after 3 months.Copyright © Pediatr Med Rodz 2022.

Cross-sectional analysis of clinical aspects in patients with long-COVID and post-COVID syndrome.

Objective: Regarding pathogenesis, clinical manifestations, at-risk individuals, and diagnostic methods for stratifying patients for therapeutic approaches, our understanding of post-COVID syndrome is limited. Here, we set out to assess sociodemographic and clinical aspects in patients with the long-COVID and post-COVID syndrome. Methods: We performed a cross-sectional analysis of patients presenting at our specialized university hospital outpatient clinic. We assessed patients' clinical presentation, fatigue, symptoms of depression and anxiety, and impairment of smell. Results: A total of 101 patients were included (73.3% female), of whom 78.2% had a mild course of COVID-19. At presentation, 93.1% suffered from fatigue, 82.2% from impaired concentration, and 79.2% from impaired memory, 53.5% had impaired sleep. The most common secondary diagnosis found in our cohort was thyroid disease. Fatigue analysis showed that 81.3% of female and 58.8% of male patients had severe combined fatigue. Female gender was an independent risk factor for severe fatigue (severe cognitive fatigue OR = 8.045, p = 0.010; severe motor fatigue OR = 7.698, p = 0.013). Males suffered from more depressive symptoms, which correlated positively with the duration of symptom onset. 70.3% of patients with anamnestic smell impairment had hyposmia, and 18.9% were anosmic. Interpretation: Most long-COVID patients suffered from severe fatigue, with the female sex as an independent risk factor. Fatigue was not associated with symptoms of depression or anxiety. Patients with long-COVID symptoms should receive an interdisciplinary diagnostic and therapeutic approach depending on the clinical presentation.

Self-reported Smell and Taste Disorders in Patients With COVID-19: A Japanese Single-center Study.

BACKGROUND/AIM: Smell and taste disorders are among the most common symptoms of COVID-19. However, the relationship between smell and taste disorders and systemic symptoms is not fully understood in Japan. PATIENTS AND METHODS: Questionnaires were mailed to 105 of 111 COVID-19 patients who were hospitalized at our hospital between March and July 2020 in Japan. RESULTS: A total of 74 patients (response rate: 70.5%) completed the survey. Of these, six patients (8.1%) presented with smell disorders only, 16 (21.6%) presented with taste disorders only, and 17 (23.0%) presented with both smell and taste disorders. The mean Visual Analog Scale for smell and taste was 0.5 and 20, respectively, at the time of the most severe symptoms. CONCLUSION: Among COVID-19 patients in Japan, smell and taste disorders are often followed by fever and may not be the first symptoms. Sense of smell is particularly impaired. These symptoms often improve, although they sometimes persist for a long time as sequelae.

Olfactory Dysfunction in Patients Infected with 2019 Novel Coronavirus.

INTRODUCTION: The current study aimed at investigating the occurrence and features of olfactory dysfunction in patients with confirmed coronavirus disease 2019 (COVID-19) infection. MATERIALS AND METHODS: Patients with laboratory and clinically confirmed COVID-19 infection were enrolled in this longitudinal study. They were managed in either the inpatient or outpatient setting. The demographic, clinical, and outcome data were retrieved from patients' medical records. Olfactory dysfunction features, including the onset pattern, duration, and recovery time were investigated. The visual analog scale (VAS) was utilized as a self-rating subjective measurement of olfactory function. RESULTS: According to the results, the mean age of the patients (n=502) was obtained at 46.8±18.5 years; moreover, 52.4% and 47.6% of cases were female and male, respectively. It was also revealed that 35.4% and 64.5% of the subjects were outpatients and hospitalized, respectively. Based on the findings, 178 (38.4%) subjects had olfactory dysfunction. The mean values of VAS in hyposmic patients were estimated at 2.5±2.5, 8.3 ±2.1, and 9.4±1.6 at the first evaluation, in 2 weeks, and after 1 month of follow-up (P<0.001). The onset of olfactory dysfunction was more suddenly (58.7%). The majority of cases experienced olfactory dysfunction at the same time as other symptoms 72(51.1%). Based on the results, 0.4% of subjects infected with COVID-19 had olfactory dysfunction as an isolated symptom. The olfactory dysfunction was recovered after 2 weeks in 18 (25.3%) anosmic and 37(46.8%) hyposmic patients. CONCLUSION: Olfactory dysfunction seemed to be an important symptom of COVID-19 infection. The occurrence of this disturbance as a transient self-limited condition was significantly higher among female subjects.

Main symptoms in patients presenting in the COVID-19 period.

BACKGROUND: The first case of a novel coronavirus (COVID-19) infection was detected in Wuhan, fever and respiratory symptoms have been frequently reported in patients infected with this virus. AIM: It was aimed to compare the symptoms of patients with COVID-19 positivity and patients without COVID-19 positivity hospitalized with suspicion of COVID-19. METHODS: Patients presenting to the Sakarya University Training and Research Hospital with suspicion of COVID-19 were included in the study. Samples were obtained from the patients and PCR tests were performed; the patients were grouped as COVID-19 positive and COVID-19 negative; these two groups were questioned for 15 symptoms and the results were compared. RESULTS: A total of 297 patients with suspicion of COVID-19 were included in the study. COVID-19 was positive in 143 patients and negative in 154 patients. The most common symptoms in the COVID-19 positive group were: cough (56.6%), weakness (56.6%), taste disorder (35.7%), myalgia (34.3%), and fever (33.6%); and in the COVID-19 negative group: cough (63%), weakness (45.5%), dyspnea (29.9%), headache (27.3%) and fever (24.7%). When these two groups were compared, taste disorder, smell disorder and diarrhea were significantly higher in the COVID-19 positive group (p = <0,00001, p = 0,00001 and p = 0,02). CONCLUSION: Our study showed that taste and smell disorders and diarrhea were important markers in COVID-19 infection.