Ryan O'Dell, MD, PhD
Cards
About
Titles
Assistant Professor of Psychiatry
Biography
My passion for the pursuit of knowledge and scientific research has been a consistent and deep-rooted journey. As an undergraduate at the University of Rochester my scientific inquires took shape as a four-year research project in which I investigated how the primate brain coordinates complex muscle sets to achieve delicate hand and finger movements. As an MD/PhD candidate at SUNY Upstate, I used multiphoton live imaging techniques in an ex utero explant mouse model, investigating the role of the extracellular matrix protein Reelin in the dynamic properties of the emerging neurite arbor in early cortical development.
As a current PGY4 in the Yale Neuroscience Research Training Program, it is my ultimate goal to pursue a fellowship and eventual career in Geriatric Psychiatry, with a focus on Alzheimer’s disease and related neurocognitive disorders. Although it was my passion for the science that initially captivated me, it was not until I spent time in a Neurocognitive Clinic as a medical student and first sat with patients and their loved ones as they learned of this life-altering diagnosis, that I came to appreciate how the bench connects to the bedside.
To that end, throughout my time in the NRTP I have been working with Christopher van Dyck, MD and Adam Mecca, MD/PhD at the Alzheimer’s Disease Research Unit (ADRU), a clinical research unit specializing in Alzheimer’s disease, cognitive disorders, and aging research. Under this dual mentorship I have subsequently accumulated the technical tools, skills, and knowledge base necessary to collect, analyze, and interpret data gathered from the variety of ongoing multimodal neuroimaging studies (PET, MRI, fMRI) and clinical trials at the ADRU. Generally, I am interested in the investigation of novel neuroimaging biomarkers across the continuum of Alzheimer’s disease, spanning the preclinical to clinical stages of dementia. Such studies are essential for not only a more comprehensive understanding of disease pathogenesis and progression, but for the development of novel neuroimaging biomarkers for earlier diagnosis and intervention, tracking of disease progression, and monitoring of therapeutic efficacy in treatment studies.
I am currently involved in a variety of ongoing cross-sectional and longitudinal studies in the early stages of Alzheimer’s disease using a promising PET biomarker of synaptic density, [11C]UCB-J, which binds synaptic vesicle glycoprotein 2 (SV2A). Our goals include not only characterizing the spatiotemporal distribution of synaptic alterations across the continuum of disease (including preclinical, i.e. cognitively unimpaired but biomarker positive, cohorts), but determining the relationship of said synaptic alterations with other neuroimaging markers of disease progression, including amyloid/tau accumulation and glucose hypometabolism, respectively assessed by [11C]PiB, [18F]MK6240, and [18F]FDG PET.
My long-term career goals include becoming not only a competent and compassionate practicing Geriatric Psychiatrist, but an independently funded investigator in the fields of Alzheimer’s disease molecular neuroimaging and clinical trial design. In my free time I enjoy hiking the Connecticut trail systems and exploring the myriad craft breweries our state has to offer.
Appointments
Psychiatry
Assistant ProfessorPrimary
Other Departments & Organizations
- MR Center
- Psychiatry
- Yale Medicine
Education & Training
- Geriatric Psychiatry Fellow
- Yale University School of Medicine (2022)
- Psychiatry Resident
- Yale University School of Medicine (2021)
- MD
- SUNY Upstate Medical University (2017)
- PhD
- SUNY Upstate Medical University (2017)
- BS
- University of Rochester, Neuroscience (2007)
- BA
- University of Rochester, Department of Modern Languages and Cultures/Spanish (2007)
Research
Publications
2024
Generation of Synthetic brain PET images of synaptic density from MRI and FDG-PET using a Multi-stage U-Net
Zheng X, Worhunsky P, Liu Q, Zhou B, Chen X, Guo X, Xie H, Sun H, Zhang J, Toyonaga T, Mecca A, O’Dell R, van Dyck C, Carson R, Radhakrishnan R, Liu C. Generation of Synthetic brain PET images of synaptic density from MRI and FDG-PET using a Multi-stage U-Net. 2024, 00: 1-2. DOI: 10.1109/nss/mic/rtsd57108.2024.10655600.Peer-Reviewed Original ResearchSelf‐reported hearing loss is associated with faster cognitive and functional decline but not diagnostic conversion in the ADNI cohort
Miller A, Sharp E, Wang S, Zhao Y, Mecca A, van Dyck C, O'Dell R, Initiative F. Self‐reported hearing loss is associated with faster cognitive and functional decline but not diagnostic conversion in the ADNI cohort. Alzheimer's & Dementia 2024, 20: 7847-7858. PMID: 39324520, DOI: 10.1002/alz.14252.Peer-Reviewed Original ResearchSelf-reported hearing lossFunctional Activities QuestionnaireHearing lossMild cognitive impairmentModifiable risk factorsMild cognitive impairment participantsFunctional declineImpairment diagnosisModified Preclinical Alzheimer Cognitive CompositeRate of functional declineRate of cognitive declinePreclinical Alzheimer Cognitive CompositeRisk factorsCognitive impairmentSignificant longitudinal associationsActivity QuestionnaireLongitudinal associationsAlzheimer's Disease Neuroimaging InitiativeLongitudinal relationshipCognitive compositeCN participantsIncreased riskCognitive declineParticipantsDiagnostic conversionValidation of a Simplified Tissue-to-Reference Ratio Measurement Using SUVR to Assess Synaptic Density Alterations in Alzheimer Disease with [11C]UCB-J PET
Young J, O’Dell R, Naganawa M, Toyonaga T, Chen M, Nabulsi N, Huang Y, Cooper E, Miller A, Lam J, Bates K, Ruan A, Nelsen K, Salardini E, Carson R, van Dyck C, Mecca A. Validation of a Simplified Tissue-to-Reference Ratio Measurement Using SUVR to Assess Synaptic Density Alterations in Alzheimer Disease with [11C]UCB-J PET. Journal Of Nuclear Medicine 2024, 65: jnumed.124.267419. PMID: 39299782, PMCID: PMC11533916, DOI: 10.2967/jnumed.124.267419.Peer-Reviewed Original ResearchDistribution volume ratioSUV ratioSynaptic densityEffect sizeAlzheimer's diseaseLongitudinal study of Alzheimer's diseaseMethods:</b> ParticipantsLongitudinal studyMeasure synaptic densityAD participantsStudy of Alzheimer's diseaseNormal cognitionReference regionOlder adultsMulticenterDensity alterationsCommentary on “Study Partner Report of Apathy in Older Adults is Associated with AD Biomarkers: Findings from the Harvard Aging Brain Study”
Khasnavis S, O'Dell R, van Dyck C, Mecca A. Commentary on “Study Partner Report of Apathy in Older Adults is Associated with AD Biomarkers: Findings from the Harvard Aging Brain Study”. American Journal Of Geriatric Psychiatry 2024, 32: 920-921. PMID: 38658231, DOI: 10.1016/j.jagp.2024.03.017.Peer-Reviewed Original ResearchSynaptic density patterns in early Alzheimer’s disease assessed by independent component analysis
Fang X, Raval N, O’Dell R, Naganawa M, Mecca A, Chen M, van Dyck C, Carson R. Synaptic density patterns in early Alzheimer’s disease assessed by independent component analysis. Brain Communications 2024, 6: fcae107. PMID: 38601916, PMCID: PMC11004947, DOI: 10.1093/braincomms/fcae107.Peer-Reviewed Original ResearchMedial temporal brain regionsAlzheimer's diseaseTemporal brain regionsCognitive deficitsBrain regionsCognitive impairmentPostmortem studiesBinds to SV2ASynaptic densityReduction of synaptic densityIndependent component analysisSynaptic lossAlzheimerDeficitsImpairmentBrainNeocortexComponent analysisPrimary pathologySV2AAssessment of disparities in timely diagnosis and comprehensive workup of cognitive impairment between English and Spanish speakers
Silva-Rudberg J, Carrión C, Pérez-Palmer N, Li J, Mehta S, Diab N, Mecca A, O'Dell R. Assessment of disparities in timely diagnosis and comprehensive workup of cognitive impairment between English and Spanish speakers. American Journal Of Geriatric Psychiatry 2024, 32: 773-786. PMID: 38336573, PMCID: PMC11162952, DOI: 10.1016/j.jagp.2024.01.030.Peer-Reviewed Original ResearchDiagnosis of mild cognitive impairmentSpanish-speaking patientsMild cognitive impairmentHispanic/Latino patientsCognitive impairmentNon-English language preferenceLanguage preferenceComprehension of diagnosisImpact of language barriersAssessment of disparitiesDiagnosis of cognitive impairmentSpanish language preferenceDiagnosis of dementiaElectronic medical recordsCross-sectional studyTimeliness of diagnosisDementia careRetrospective cross-sectional studyDementia diagnosisHealth disparitiesU.S. Hispanic/Latino populationBinomial logistic regressionNeighborhood disadvantageSpanish speakersHealth careA pilot study to evaluate the effect of CT1812 treatment on synaptic density and other biomarkers in Alzheimer’s disease
van Dyck C, Mecca A, O’Dell R, Bartlett H, Diepenbrock N, Huang Y, Hamby M, Grundman M, Catalano S, Caggiano A, Carson R. A pilot study to evaluate the effect of CT1812 treatment on synaptic density and other biomarkers in Alzheimer’s disease. Alzheimer's Research & Therapy 2024, 16: 20. PMID: 38273408, PMCID: PMC10809445, DOI: 10.1186/s13195-024-01382-2.Peer-Reviewed Original ResearchConceptsMild to moderate dementiaPositron emission tomographyAlzheimer's diseaseVolumetric MRIModerate dementiaClinical rating scalesSynaptic vesicle glycoprotein 2ACerebrospinal fluidMouse model of ADPharmacodynamic effectsPlacebo-controlled phase 1 clinical trialBiomarkers of AD pathologyClinical trialsCognitive measuresNominally significant differencesPhase 1 clinical trialModel of ADHippocampal cortexPhase 1/2 studyRating ScaleParallel-group trialSynaptic densityTrial registrationThe clinical trialPlacebo-controlledSigma-2 receptor ligands
2023
Tau epicenter identification and connectivity in clinically heterogeneous Alzheimer’s disease variants
Trainer A, Xu W, Chase A, O'Dell R, Tun S, Li J, Ju S, van Dyck C, Mecca A, Fredricks C. Tau epicenter identification and connectivity in clinically heterogeneous Alzheimer’s disease variants. Alzheimer's & Dementia 2023, 19 DOI: 10.1002/alz.079435.Peer-Reviewed Original ResearchAmnestic Alzheimer's diseaseLogopenic variant primary progressive aphasiaPosterior cortical atrophyFunctional connectivity mapsHigher tau burdenFunctional connectivityTau burdenAlzheimer's diseaseConnectivity mapsLongitudinal tau-PETSpread of tauVariant primary progressive aphasiaFusiform gyrusFrontal eye fieldPrimary progressive aphasiaBrains of participantsTau PET scansSuperior parietal lobulePatient-specific biomarkersCortical atrophyCommon subtypeTau-PETHealthy controlsParietooccipital cortexPET scansAssessment of Gray Matter Microstructure and Synaptic Density in Alzheimer's Disease: A Multimodal Imaging Study With DTI and SV2A PET
Silva-Rudberg J, Salardini E, O'Dell R, Chen M, Ra J, Georgelos J, Morehouse M, Melino K, Varma P, Toyonaga T, Nabulsi N, Huang Y, Carson R, van Dyck C, Mecca A. Assessment of Gray Matter Microstructure and Synaptic Density in Alzheimer's Disease: A Multimodal Imaging Study With DTI and SV2A PET. American Journal Of Geriatric Psychiatry 2023, 32: 17-28. PMID: 37673749, PMCID: PMC10840732, DOI: 10.1016/j.jagp.2023.08.002.Peer-Reviewed Original ResearchSynaptic densityAlzheimer's diseaseMean diffusivitySynaptic lossGray matter microstructureGray matter mean diffusivityDisease pathologyHippocampal synaptic densityMajor pathological correlateSetting of ADAD-related neuropathologySynaptic vesicle glycoprotein 2AHippocampal mean diffusivityAlzheimer's disease pathologyAmyloid-positive participantsMatter mean diffusivityPositron emission tomography (PET) imagingEmission Tomography ImagingGray matter structuresPathological correlatesPositive participantsInverse associationAD groupCognitive impairmentDiseasePrincipal component analysis of synaptic density measured with [11C]UCB-J PET in early Alzheimer’s disease
O'Dell R, Higgins-Chen A, Gupta D, Chen M, Naganawa M, Toyonaga T, Lu Y, Ni G, Chupak A, Zhao W, Salardini E, Nabulsi N, Huang Y, Arnsten A, Carson R, van Dyck C, Mecca A. Principal component analysis of synaptic density measured with [11C]UCB-J PET in early Alzheimer’s disease. NeuroImage Clinical 2023, 39: 103457. PMID: 37422964, PMCID: PMC10338149, DOI: 10.1016/j.nicl.2023.103457.Peer-Reviewed Original ResearchConceptsCognitive domainsCognitive performanceSubjects' scoresCortical regionsNeuropsychological batteryEarly Alzheimer's diseaseAD groupBilateral regionsNormal participantsNegative loadingsCognitive impairmentCN participantsAlzheimer's diseaseParticipantsStructural correlatesStrong contributionParticipant characteristicsScoresPositive loadingsData-driven approachTotal variancePrincipal component analysisSpecific spatial patterns
Academic Achievements & Community Involvement
Clinical Care
Overview
Ryan O’Dell, MD, PhD, is a geriatric psychiatrist who specializes in the evaluation and management cognitive disorders, particularly Alzheimer’s disease.
He says he was drawn to the field of Alzheimer’s disease and related dementias because there is still much to learn about them. Recent breakthroughs, such as the Food and Drug Administration’s approval of lecanemab (brand name: Leqembi), a medication shown to slow the progression of the early stages of Alzheimer’s disease, has been an exciting new development in this field, he adds.
Dr. O’Dell says he practices a family-centered approach. “I think the involvement of families and their support systems in the evaluation and management of cognitive disorders is a very important part of the process, whether it’s a spouse or an adult child, or whoever the patient is comfortable bringing to an appointment,” he says. “Another important aspect of the evaluation of cognitive disorders is addressing any changes in mood and behavior, such as anxiety and depression, which are frequently seen with advancing neurodegenerative disease, and sometimes may even precede cognitive or functional decline.”
He says it’s also important for him to take things slow and develop rapport when he first meets a patient and their family.
“Unless someone is coming to me who is transferring care and there’s a clear-cut, pre-established workup, we don’t jump to conclusions surrounding a diagnosis,” he says. “If someone is experiencing new memory changes, we need to first do a comprehensive diagnostic workup. I am transparent and take a gentle approach. I do share what I’m worried about and keep everyone in the loop. I might say, ‘We don’t have a diagnosis yet, but here’s what we have to do to get one.’”
In addition, Dr. O’Dell says he keeps the patient’s and family’s perspectives, values, and goals of care in mind throughout the evaluation and treatment process.
“It’s important to consider that some diagnostic procedures may be too invasive or not tolerated because of age, active medical conditions, or even significant anxiety or agitation, and we should therefore take a different approach to the workup, one that both the patient and their family feel most comfortable with,” he says.
Dr. O’Dell’s research interests include using brain imaging (PET and MRI) to study the underlying pathophysiological changes in people with symptomatic and pre-symptomatic Alzheimer’s disease. He is also involved in several Alzheimer’s disease clinical trials through the Yale Alzheimer’s Disease Research Unit (ADRU). For more information surrounding ongoing clinical trials and observational neuroimaging studies in Alzheimer’s disease, call (203) 764-8100.
Clinical Specialties
News & Links
News
- June 30, 2022
Residents, Fellows, Faculty, Staff Honored at 2022 Commencement Ceremonies
- June 30, 2021
Residents, Fellows, Faculty Honored at 2021 Commencement Ceremony
- February 06, 2020
O'Dell, Mecca Awarded Travel Scholarships
- June 10, 2019
Higgins-Chen, Lin, O'Dell named recipients of Thomas P. Detre Fellowship Awards