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Feing-Kwong-Chan A, Manera V, Payne M, Derreumaux A, Lemaire J, Sacco G, Mouton A, Plonka A, Fernandez X, Vandersteen C, Gros A. The first quick olfactory test specific for Alzheimer's disease and French culture. Eur Arch Otorhinolaryngol 2024; 281:757-766. [PMID: 37695364 DOI: 10.1007/s00405-023-08217-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 08/28/2023] [Indexed: 09/12/2023]
Abstract
PURPOSE Olfactory identification disorder is considered a promising early biomarker of Alzheimer's disease (AD). The QUICK TODA2 can be used as a short olfactory screening tool specific for French AD patients. The selection of AD specific odorants and the design of this screening were the main objectives of this twofold study. METHODS In study 1, the TODA2 olfactory test was administered to 43 mild-AD patients and 45 healthy controls (HC) in five memory centres in France. The selection of AD specific odorants was based on the differences in the proportion of correct answers and in the threshold means between AD and HC groups. In study 2, another set of 19 mild-AD patient were included at the memory centre of Nice Hospital. All participants completed the olfactory assessment pipeline including the QUICK TODA2, TODA2 and Sniffin' Sticks Identification sub-Test (SST-i). The individual scores of the three tests were correlated. RESULTS In study 1, ten TODA2 odorants could significantly differentiate AD participants from controls. We selected the six most AD-sensitive items to design the QUICK TODA2. In study 2, we reported strong significant correlations between QUICK TODA2 and TODA2 (ρ(17) = 0.68, p = 0.001**), SST-i and QUICK TODA2 (ρ(17) = 0.65, p = 0.002**), SST-i and TODA2 (ρ(17) = 0.57, p = 0.01*). CONCLUSION QUICK TODA2 is a 5-min non-invasive olfactory AD screening tool dedicated to French culture. Its results converge with those of longer, validated olfactory tests. It could be used as a quick screening tool in the general daily practice before an extensive assessment in memory centres.
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Affiliation(s)
- Anais Feing-Kwong-Chan
- Département d'Orthophonie, UFR Médecine de Nice, Nice, France.
- Université Côte d'Azur, CoBTeK, Nice, France.
| | - Valeria Manera
- Département d'Orthophonie, UFR Médecine de Nice, Nice, France
- Université Côte d'Azur, CoBTeK, Nice, France
- Service Clinique Gériatrique de Soins Ambulatoires, Centre Hospitalier Universitaire de Nice, Centre Mémoire Ressources et Recherche, Université Côte d'Azur, Nice, France
- Association Innovation Alzheimer, Nice, France
| | - Magali Payne
- Département d'Orthophonie, UFR Médecine de Nice, Nice, France
- Université Côte d'Azur, CoBTeK, Nice, France
- Association Innovation Alzheimer, Nice, France
- Centre Hospitalier Universitaire-Lenval, Hôpitaux Pédiatriques de Nice, Nice, France
| | - Alexandre Derreumaux
- Université Côte d'Azur, CoBTeK, Nice, France
- Service Clinique Gériatrique de Soins Ambulatoires, Centre Hospitalier Universitaire de Nice, Centre Mémoire Ressources et Recherche, Université Côte d'Azur, Nice, France
| | - Justine Lemaire
- Université Côte d'Azur, CoBTeK, Nice, France
- Service Clinique Gériatrique de Soins Ambulatoires, Centre Hospitalier Universitaire de Nice, Centre Mémoire Ressources et Recherche, Université Côte d'Azur, Nice, France
| | - Guillaume Sacco
- Département d'Orthophonie, UFR Médecine de Nice, Nice, France
- Université Côte d'Azur, CoBTeK, Nice, France
- Service Clinique Gériatrique de Soins Ambulatoires, Centre Hospitalier Universitaire de Nice, Centre Mémoire Ressources et Recherche, Université Côte d'Azur, Nice, France
- Association Innovation Alzheimer, Nice, France
| | - Aurélie Mouton
- Département d'Orthophonie, UFR Médecine de Nice, Nice, France
- Université Côte d'Azur, CoBTeK, Nice, France
- Service Clinique Gériatrique de Soins Ambulatoires, Centre Hospitalier Universitaire de Nice, Centre Mémoire Ressources et Recherche, Université Côte d'Azur, Nice, France
- Association Innovation Alzheimer, Nice, France
| | - Alexandra Plonka
- Département d'Orthophonie, UFR Médecine de Nice, Nice, France
- Université Côte d'Azur, CoBTeK, Nice, France
- Service Clinique Gériatrique de Soins Ambulatoires, Centre Hospitalier Universitaire de Nice, Centre Mémoire Ressources et Recherche, Université Côte d'Azur, Nice, France
- Association Innovation Alzheimer, Nice, France
| | - Xavier Fernandez
- Institut de Chimie, UMR 7272, Université Côte d'Azur, CNRS, Parc Valrose, 28 Avenue, Nice, France
| | - Clair Vandersteen
- Institut Universitaire de la Face et du Cou, Centre Hospitalier Universitaire de Nice, France Valrose, 06108, Nice, France
| | - Auriane Gros
- Département d'Orthophonie, UFR Médecine de Nice, Nice, France
- Université Côte d'Azur, CoBTeK, Nice, France
- Service Clinique Gériatrique de Soins Ambulatoires, Centre Hospitalier Universitaire de Nice, Centre Mémoire Ressources et Recherche, Université Côte d'Azur, Nice, France
- Association Innovation Alzheimer, Nice, France
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Virtual issue: ENT care of older adults. The Journal of Laryngology & Otology 2022; 136:785-787. [DOI: 10.1017/s0022215122001207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Yap AC, Mahendran R, Kua EH, Zhou W, Wang DY. Olfactory dysfunction is associated with mild cognitive impairment in community-dwelling older adults. Front Aging Neurosci 2022; 14:930686. [PMID: 36004001 PMCID: PMC9393534 DOI: 10.3389/fnagi.2022.930686] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 07/18/2022] [Indexed: 12/02/2022] Open
Abstract
Background Olfactory impairment is aging related and is associated with cognitive decline in older adults. However, it remains unclear if an olfactory impairment is associated with mild cognitive impairment (MCI) and the degree of impairment in the MCI subtypes. Materials and methods In a cohort of community-living older adults aged 60 years and above, 670 participants were recruited from the Community Health and Intergenerational (CHI) Study. Olfactory function was assessed using a locally developed nine-item smell test in association with neurocognitive assessments. Analysis of covariance (ANCOVA) was used to examine the association of smell identification score and clinical cognitive status while considering demographic, clinical, and neuropsychological factors with Bonferroni correction for group comparisons. Results Age-related smell detection between normal aging (NA) and MCI participants had no significant difference. The overall mean smell identification score in older adults was negatively correlated with age. The mean smell identification score of MCI participants was also not significantly different as compared with NA, but an amnestic MCI multiple domain (aMCI_MD) subgroup had significantly lower (impaired) mean smell identification scores compared with the NA and MCI single domain (amnestic and non-amnestic) group. Conclusion This study demonstrated that olfactory identification impairment is a comorbidity in older adults with amnestic MCI (aMCI) and is a potential marker associated with an early stage of a neurocognitive disorder. The smell test could act as a screening tool to help in the early detection of smell impairment for heterogeneous syndromes of MCI among community-dwelling older adults. Clinicians and researchers could benefit from utilizing the locally developed smell test to screen their patients or research participants before the initiation of an appropriate health intervention or in a clinical trial.
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Affiliation(s)
- Ai Che Yap
- Department of Food Science and Technology, National University of Singapore, Singapore, Singapore
| | - Rathi Mahendran
- Department of Psychological Medicine, Mind Science Centre, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Ee Heok Kua
- Department of Psychological Medicine, Mind Science Centre, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Department of Psychological Medicine, National University Hospital, Singapore, Singapore
- *Correspondence: Ee Heok Kua,
| | - Weibiao Zhou
- Department of Food Science and Technology, National University of Singapore, Singapore, Singapore
- Weibiao Zhou,
| | - De Yun Wang
- Department of Otolaryngology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- De Yun Wang,
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Payne M, Manera V, Robert P, Vandersteen C, Beauchet O, Galery K, Sacco G, Fabre R, Gros A. Olfactory identification disorders due to Alzheimer's disease: A new test from France to Quebec. PLoS One 2022; 17:e0265764. [PMID: 35377902 PMCID: PMC8979441 DOI: 10.1371/journal.pone.0265764] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 03/07/2022] [Indexed: 12/14/2022] Open
Abstract
Olfactory identification disorder is regarded as an early marker of Alzheimer's disease (AD) and of similar diagnostic significance of biological or cognitive markers. Premature damage of the entorhinal olfactory cortex, the hippocampus and the orbitofrontal cortex characterize AD and suggest a specific impairment of olfactory identification. The use of psychophysical olfactory identification tests in clinical diagnostic practice is therefore strongly recommended, but not required. As these widespread tests are rarely used, an innovative test, adapted to this target group has been developed. It has been used and validated in a routine care protocol at different Memory Centers in France and in Quebec, Canada. A total of 157 participants were recruited: including 63 Alzheimer's patients and 94 healthy controls. The test was composed of 14 odorants diluted into 4 different concentrations. A computer interface generated randomization of 6 odors per participant and the automatic calculation of identification scores, of perceptual thresholds and of composite scores. All participants underwent a Mini Mental Scale Examination within the previous three months or on the same day of the olfactory test. The Alzheimer's patients had a score between 20 and 30 and healthy controls participants had a score above 28 without any loss of points on recalled items. The results show that our olfactory identification test is able to significantly differentiate Alzheimer's patients from healthy controls (p < 0.001), and to distinguish the French population tested from the Quebec population (p < 0.001). This study highlights an olfactory identification disorder as a target for early diagnosis of AD. Its cultural qualities make it a potential candidate for differentiated calibration between France and Quebec.
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Affiliation(s)
- Magali Payne
- CoBteK lab (Cognition Behavior and Technology), Université Cote d’Azur, Nice, France
- Centre Hospitalier Universitaire de Nice, Service Clinique Gériatrique du Cerveau et du Mouvement, Centre Mémoire Ressources et Recherche, Université Côte d’Azur, Nice, France
| | - Valeria Manera
- CoBteK lab (Cognition Behavior and Technology), Université Cote d’Azur, Nice, France
| | - Philippe Robert
- CoBteK lab (Cognition Behavior and Technology), Université Cote d’Azur, Nice, France
- Centre Hospitalier Universitaire de Nice, Service Clinique Gériatrique du Cerveau et du Mouvement, Centre Mémoire Ressources et Recherche, Université Côte d’Azur, Nice, France
| | - Clair Vandersteen
- Institut Universitaire de la Face et du Cou, Centre Hospitalier Universitaire de Nice, Université Côte d’Azur, Nice, France
| | - Olivier Beauchet
- Research Center of the Institut Universitaire en Gériatrie de Montréal, University of Montreal, Montreal, Canada
- Faculty of Medicine, Department of Medicine, University of Montreal, Montreal, Canada
- Division of Geriatric Medicine, Department of Medicine, Sir Mortimer B. Davis Jewish General Hospital and Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Kevin Galery
- Research Center of the Institut Universitaire en Gériatrie de Montréal, University of Montreal, Montreal, Canada
| | - Guillaume Sacco
- CoBteK lab (Cognition Behavior and Technology), Université Cote d’Azur, Nice, France
- Centre Hospitalier Universitaire de Nice, Service Clinique Gériatrique du Cerveau et du Mouvement, Centre Mémoire Ressources et Recherche, Université Côte d’Azur, Nice, France
| | - Roxane Fabre
- CoBteK lab (Cognition Behavior and Technology), Université Cote d’Azur, Nice, France
- Département de Santé Publique, Centre Hospitalier Universitaire de Nice, Université Côte d’Azur Département de Santé Publique, Nice, France
| | - Auriane Gros
- CoBteK lab (Cognition Behavior and Technology), Université Cote d’Azur, Nice, France
- Centre Hospitalier Universitaire de Nice, Service Clinique Gériatrique du Cerveau et du Mouvement, Centre Mémoire Ressources et Recherche, Université Côte d’Azur, Nice, France
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Hearing loss and dementia, vestibular neuronitis, salivary carcinoma, and the history of tympanic membrane anatomy. The Journal of Laryngology & Otology 2022; 136:95-96. [DOI: 10.1017/s0022215122000512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Nogi S, Uchida K, Maruta J, Kurozumi H, Akada S, Shiba M, Inoue K. Utility of olfactory identification test for screening of cognitive dysfunction in community-dwelling older adults. PeerJ 2022; 9:e12656. [PMID: 35036144 PMCID: PMC8697762 DOI: 10.7717/peerj.12656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 11/29/2021] [Indexed: 11/29/2022] Open
Abstract
Background There is a need for a large-scale screening test that can be used to detect dementia in older individuals at an early stage. Olfactory identification deficits have been shown to occur in the early stages of dementia, indicating their usefulness in screening tests. This study investigated the utility of an olfactory identification test as a screening test for mild cognitive dysfunction in community-dwelling older people. Methods The subjects were city-dwelling individuals aged over 65 years but under 85 years who had not been diagnosed with dementia or mild cognitive impairment. The Japanese version of the Mild Cognitive Impairment Screen was used to evaluate cognitive function. Based on the results, the subjects were divided into two groups: healthy group and cognitively impaired group. Olfactory identification abilities based on the Japanese version of the University of Pennsylvania Smell Identification Test were compared between the groups. Results There were 182 participants in total: 77 in the healthy group and 105 in the cognitively impaired group. The mean olfactory identification test score of the cognitively impaired group was significantly lower than that of the healthy group. The cognitive impairment test score was significantly correlated with the olfactory identification test score. Conclusions Cross-sectional olfactory identification deficits at baseline in community-dwelling older adults reflected cognitive dysfunction. Assessing olfactory identification ability might be useful as a screening test for mild cognitive dysfunction in community-dwelling older people.
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Affiliation(s)
- Satoshi Nogi
- Neuropsychiatry, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Kentaro Uchida
- Neuropsychiatry, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Jumpei Maruta
- Neuropsychiatry, Osaka City University Graduate School of Medicine, Osaka, Japan.,Medical Center for Dementia, Osaka City Kosaiin Hospital, Osaka, Japan
| | - Hideo Kurozumi
- Neuropsychiatry, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Satoshi Akada
- Neuropsychiatry, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Masatsugu Shiba
- Medical Statistics, Osaka City University Graduate School of Medicine and Faculty of Medicine, Osaka, Japan
| | - Koki Inoue
- Neuropsychiatry, Osaka City University Graduate School of Medicine, Osaka, Japan.,Center for Brain Science, Osaka City University Graduate School of Medicine and Faculty of Medicine, Osaka, Japan
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Hsieh CH, Chen PG, Zhou B, Lin LJ, Lai JT, Shen PH. Investigation of Normative Value of Commercialized Taiwan Smell Identification Test. ALLERGY & RHINOLOGY 2021; 12:2152656721991525. [PMID: 33643679 PMCID: PMC7894691 DOI: 10.1177/2152656721991525] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Background The Taiwan Smell Identification Test (TWSIT) was developed and successfully administered in Taiwanese population since 2015. However, for sanitation reason, the original liquid-jar form of this test is not appropriate. The commercialized TWSIT was then re-designed as “scratch-and-sniff” version: the TIBSIT (Top International Biotech, Taipei, Taiwan). This project aims to investigate the normative value of TIBSIT in different age groups and genders. Methods Volunteers aged 20 to 80 with no subjective smell loss were recruited in a rhinology clinic. The participants were given full instructions on using the TIBSIT. Results Two hundred and nine healthy subjects (female: male =107: 102) were enrolled into this study. The median TIBSIT score in female and male subjects is 47 and 46, respectively. Subjects were further divided into three age groups: (A) 20∼34 years (n = 77), (B) 35∼54 years (n = 77), and (C) 55∼80 years (n = 55). The TIBSIT scores at the tenth percentile value at each age group of male patients are 43, 42 and 37; while the scores at the tenth percentile value at each age group of female patients are 42, 42 and 41. TIBSIT score was significantly and inversely correlated with age (Spearman rho = − 0.20, p = 0.004.). Conclusion We established the normative values of the new TIBSIT in different age groups in Taiwan. Future nation-wide screening is needed for more sophisticated norms establishment.
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Affiliation(s)
- Ching-Hung Hsieh
- Department of Otolaryngology, Kuang Tien General Hospital, Taichung
| | - Philip G Chen
- Department of Otolaryngology-Head and Neck Surgery, University of Texas Health San Antonio, San Antonio, Texas
| | - Bing Zhou
- Department of Otolaryngology-Head and Neck Surgery, Capital Medical University, Beijing, China
| | - Li-Jung Lin
- Graduate Institute of Sports, Leisure & Hospitality Management, National Taiwan Normal University, Taipei
| | - Jen-Tsung Lai
- Department of Otolaryngology, Kuang Tien General Hospital, Taichung
| | - Ping-Hung Shen
- Department of Otolaryngology, Kuang Tien General Hospital, Taichung.,Department of Nursing, Hung-Kuang University, Taichung
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Turner RS, Stubbs T, Davies DA, Albensi BC. Potential New Approaches for Diagnosis of Alzheimer's Disease and Related Dementias. Front Neurol 2020; 11:496. [PMID: 32582013 PMCID: PMC7290039 DOI: 10.3389/fneur.2020.00496] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 05/06/2020] [Indexed: 12/21/2022] Open
Abstract
Dementia is an umbrella term-caused by a large number of specific diagnoses, including several neurodegenerative disorders. Alzheimer's disease (AD) is now the most common cause of dementia in advanced countries, while dementia due to neurosyphilis was the leading cause a century ago. Many challenges remain for diagnosing dementia definitively. Some of these include variability of early symptoms and overlap with similar disorders, as well as the possibility of combined, or mixed, etiologies in some cases. Newer technologies, including the incorporation of PET neuroimaging and other biomarkers (genomics and proteomics), are being incorporated into revised diagnostic criteria. However, the application of novel diagnostic methods at clinical sites is plagued by many caveats including availability and access. This review surveys new diagnostic methods as well as remaining challenges-for clinical care and clinical research.
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Affiliation(s)
- R Scott Turner
- Department of Neurology, Georgetown University, Washington, DC, United States
| | - Terry Stubbs
- ActivMed, Practices & Research, Methuen, MA, United States
| | - Don A Davies
- Division of Neurodegenerative Disorders, St Boniface Hospital Research, University of Manitoba, Winnipeg, MB, Canada
| | - Benedict C Albensi
- Division of Neurodegenerative Disorders, St Boniface Hospital Research, University of Manitoba, Winnipeg, MB, Canada.,Department of Pharmacology & Therapeutics, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB, Canada
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Dawes P, Pye A, Reeves D, Yeung WK, Sheikh S, Thodi C, Charalambous AP, Gallant K, Nasreddine Z, Leroi I. Protocol for the development of versions of the Montreal Cognitive Assessment (MoCA) for people with hearing or vision impairment. BMJ Open 2019; 9:e026246. [PMID: 30928949 PMCID: PMC6475249 DOI: 10.1136/bmjopen-2018-026246] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
INTRODUCTION Hearing and vision impairments are highly prevalent among older adults and impact commonly used cognitive assessment tools for the identification of dementia. Adaptations of such tests for people with hearing or vision impairment have not been adequately validated among populations with such sensory impairment. METHODS AND ANALYSIS We will develop two versions of the Montreal Cognitive Assessment (MoCA) for people with acquired hearing impairment (MoCA-H) or vision impairment (MoCA-V). The MoCA-H and MoCA-V will exclude the existing MoCA items that are presented in spoken or visual format, respectively, and include new suitably adapted items. Participants (n=792) with combinations of hearing, vision and cognitive impairment will complete standard or adapted versions of the MoCA across three language sites (English, French and Greek). Development of the MoCA-H and the MoCA-V will be based on analysis of adapted and standard MoCA items following model-based development to select the combination of items for the MoCA-H and MoCA-V that provide optimal sensitivity and specificity for detection of dementia. ETHICS AND DISSEMINATION The study has received ethical approval from respective centres in the UK, France, Greece and Cyprus. The results of the study will be disseminated through peer-reviewed publication, conference presentations, the study website (https://www.sense-cog.eu/), the SENSE-Cog Twitter account (@sense_cog) and the MoCA test website (https://www.mocatest.org/). The main outputs of the study will be versions of the MoCA that are appropriate for use with adults with acquired hearing or vision impairment and will contribute significantly to the clinical care of older people.
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Affiliation(s)
- Piers Dawes
- Manchester Centre for Audiology and Deafness, University of Manchester, Manhcester, UK
| | - Annie Pye
- Institute of Brain, Behavior and Mental Health, University of Manchester, Manchester, UK
| | - David Reeves
- Institute of Population Health, Centre for Biostatistics, University of Manchester, Manchester, UK
| | - Wai Kent Yeung
- Division of Neuroscience and Experimental Psychology, University of Manchester, Manchester, UK
| | - Saima Sheikh
- Division of Neuroscience and Experimental Psychology, University of Manchester, Manchester, UK
| | - Chyrssoula Thodi
- Department of Health Sciences, European University Cyprus, Nicosia, Cyprus
| | | | | | | | - Iracema Leroi
- Manchester Academic Health Sciences Centre, Institute of Brain, Behaviour, and Mental Health, Manchester, UK
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Oh YS, Kim JS, Hwang EJ, Lyoo CH. Striatal dopamine uptake and olfactory dysfunction in patients with early Parkinson's disease. Parkinsonism Relat Disord 2018; 56:47-51. [DOI: 10.1016/j.parkreldis.2018.06.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 06/04/2018] [Accepted: 06/12/2018] [Indexed: 12/26/2022]
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Abstract
PURPOSE OF REVIEW The sense of smell is today one of the focuses of interest in aging and neurodegenerative disease research. In several neurodegenerative diseases, such as Parkinson's disease and Alzheimer's disease, the olfactory dysfunction is one of the initial symptoms appearing years before motor symptoms and cognitive decline, being considered a clinical marker of these diseases' early stages and a marker of disease progression and cognitive decline. Overall and under the umbrella of precision medicine, attention to olfactory function may help to improve chances of success for neuroprotective and disease-modifying therapeutic strategies. RECENT FINDINGS The use of olfaction, as clinical marker for neurodegenerative diseases is helpful in the characterization of prodromal stages of these diseases, early diagnostic strategies, differential diagnosis, and potentially prediction of treatment success. Understanding the mechanisms underlying olfactory dysfunction is central to determine its association with neurodegenerative disorders. Several anatomical systems and environmental factors may underlie or contribute to olfactory loss associated with neurological diseases, although the direct biological link to each disorder remains unclear and, thus, requires further investigation. In this review, we describe the neurobiology of olfaction, and the most common olfactory function measurements in neurodegenerative diseases. We also highlight the evidence for the presence of olfactory dysfunction in several neurodegenerative diseases, its value as a clinical marker for early stages of the diseases when combined with other clinical, biological, and neuroimage markers, and its role as a useful symptom for the differential diagnosis and follow-up of disease. The neuropathological correlations and the changes in neurotransmitter systems related with olfactory dysfunction in the neurodegenerative diseases are also described.
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