Original Paper

European Archives of Psychiatry and Clinical Neuroscience

, Volume 264, Issue 3, pp 225-233

Brain structural imaging correlates of olfactory dysfunction in obsessive–compulsive disorder

  • Cinto SegalàsAffiliated withOCD Clinical and Research Unit, Department of Psychiatry, Hospital de Bellvitge, Bellvitge University HospitalNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELLCarlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM) Email author 
  • , Pino AlonsoAffiliated withOCD Clinical and Research Unit, Department of Psychiatry, Hospital de Bellvitge, Bellvitge University HospitalNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELLCarlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM)Department of Clinical Sciences, Bellvitge Campus, University of Barcelona
  • , Arantxa OrbegozoAffiliated withNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELL
  • , Eva RealAffiliated withOCD Clinical and Research Unit, Department of Psychiatry, Hospital de Bellvitge, Bellvitge University HospitalNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELLCarlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM)
  • , Marta SubiràAffiliated withNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELL
  • , Clara López-SolàAffiliated withOCD Clinical and Research Unit, Department of Psychiatry, Hospital de Bellvitge, Bellvitge University HospitalNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELLCarlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM)Department of Clinical Sciences, Bellvitge Campus, University of Barcelona
  • , Ignacio Martínez-ZalacaínAffiliated withNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELL
  • , Javier LabadAffiliated withHospital Psiquiàtric Universitari Institut Pere Mata, IISPV Universitat Rovira I Virgili
  • , Ben J. HarrisonAffiliated withDepartment of Psychiatry, Melbourne Neuropsychiatry Centre, The University of Melbourne
    • , Jesús PujolAffiliated withMagnetic Resonance Unit, CRC-Hospital del Mar
    • , José M. MenchónAffiliated withOCD Clinical and Research Unit, Department of Psychiatry, Hospital de Bellvitge, Bellvitge University HospitalNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELLCarlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM)Department of Clinical Sciences, Bellvitge Campus, University of Barcelona
    • , Narcís CardonerAffiliated withNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELLCarlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM)Department of Clinical Sciences, Bellvitge Campus, University of Barcelona
    • , Carles Soriano-MasAffiliated withNeuroscience Group, Bellvitge Biomedical Research Institute-IDIBELLCarlos III Health Institute, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM)

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Abstract

Olfactory dysfunction has been described in obsessive–compulsive disorder (OCD). Brain regions involved in smell processing partially overlap with structures included in the neurobiological models of OCD, although no previous studies have analyzed the neuroanatomical correlates of olfactory dysfunction in this disorder. The aim of our study was to examine the association between regional gray matter volume, as assessed by a voxel-based morphometry analysis of magnetic resonance images (MRI), and olfactory function, as assessed by the Sniffin’ Sticks test (SST). Olfactory function was assessed in 19 OCD patients and 19 healthy volunteers. All participants were also scanned in a 1.5-T magnet to obtain T1-weighted anatomical MRIs, which were pre-processed and analyzed with SPM8. Three different correlation models were used to study the association between regional gray matter volumes and olfactory function in the domains assessed by the SST: detection threshold, discrimination, and identification. OCD patients showed a significant impairment in all the domains assessed by the SST. Voxel-based mapping revealed a positive association in healthy controls between detection threshold and the gray matter content of a left anterior cingulate cortex cluster. In OCD patients, a positive correlation was observed between identification errors and the gray matter volume of the left medial orbital gyrus. In a post hoc analysis, these two gray matter regions were shown to be enlarged in OCD patients. Our findings support the idea that olfactory dysfunction in OCD is associated with volumetric changes in brain areas typically implicated in the neurobiology of the disorder.

Keywords

Obsessive–compulsive disorder Olfactory function Olfactory identification Olfactory threshold Brain morphometry Neuroimaging Anterior cingulate cortex Medial orbital gyrus