Justen Robert Geddes

Works (5)

Updated: April 23rd, 2025 20:39

2024 article

Unraveling autonomic cardiovascular control complexity during orthostatic stress: Insights from a mathematical model

Hurtado, M. M., Kaempfer, R., Geddes, J. R., Olufsen, M. S., & Rodriguez-Fernandez, M. (2024, October 11). Mathematical Biosciences.

By: M. Hurtado*, R. Kaempfer*, J. Geddes*, M. Olufsen n & M. Rodriguez-Fernandez *

author keywords: Mathematical model; Autonomic nervous system; Vasovagal syncope; Orthostatic hypertension; Orthostatic hypotension
MeSH headings : Humans; Female; Autonomic Nervous System / physiopathology; Autonomic Nervous System / physiology; Tilt-Table Test; Blood Pressure / physiology; Baroreflex / physiology; Heart Rate / physiology; Models, Cardiovascular; Hypotension, Orthostatic / physiopathology; Adult; Syncope, Vasovagal / physiopathology; Young Adult; Models, Theoretical; Orthostatic Intolerance / physiopathology
topics (OpenAlex): Heart Rate Variability and Autonomic Control; Cardiovascular Syncope and Autonomic Disorders; Non-Invasive Vital Sign Monitoring
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Source: Web Of Science
Added: November 4, 2024

2022 article

Postural orthostatic tachycardia syndrome explained using a baroreflex response model

Geddes, J. R., Ottesen, J. T., Mehlsen, J., & Olufsen, M. S. (2022, August 1). Journal of The Royal Society Interface.

By: J. Geddes n, J. Ottesen*, J. Mehlsen * & M. Olufsen n

author keywords: POTS; baroreflex; autonomic dysfunction; head-up tilt; mathematical modelling
MeSH headings : Baroreflex / physiology; Blood Pressure / physiology; Heart Rate / physiology; Humans; Postural Orthostatic Tachycardia Syndrome; Posture / physiology
topics (OpenAlex): Cardiovascular Syncope and Autonomic Disorders; Heart Rate Variability and Autonomic Control; Cardiovascular Health and Disease Prevention
TL;DR: It is demonstrated that modulation of parameters characterizing BR sensitivity allows us to predict the persistent increase in HR and the low-frequency BP and HR oscillations observed in POTS patients and that it is possible to simulate patients with neuropathic and hyperadrenergic POTS. (via Semantic Scholar)
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Source: Web Of Science
Added: September 12, 2022

2021 article

Classification of orthostatic intolerance through data analytics

Gilmore, S., Hart, J., Geddes, J., Olsen, C. H., Mehlsen, J., Gremaud, P., & Olufsen, M. S. (2021, February 13). Medical & Biological Engineering & Computing.

By: S. Gilmore n, J. Hart *, J. Geddes n, C. Olsen*, J. Mehlsen *, P. Gremaud n, M. Olufsen n

author keywords: Orthostatic intolerance; Syncope; Classification; Clustering; Machine learning
MeSH headings : Autonomic Nervous System; Blood Pressure; Data Science; Heart Rate; Humans; Orthostatic Intolerance / diagnosis; Syncope / diagnosis; Tilt-Table Test
topics (OpenAlex): Cardiovascular Syncope and Autonomic Disorders; Heart Rate Variability and Autonomic Control; Respiratory and Cough-Related Research
TL;DR: This study uses machine learning to categorize patients with orthostatic intolerance and shows that machine learning can provide accurate classification of disease groups for 98% of patients and two subgroups within the control patients differentiated by their BP response. (via Semantic Scholar)
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Source: Web Of Science
Added: March 8, 2021

2020 article

Characterization of Blood Pressure and Heart Rate Oscillations of POTS Patients via Uniform Phase Empirical Mode Decomposition

Geddes, J., Mehlsen, J., & Olufsen, M. S. (2020, February 14). IEEE Transactions on Biomedical Engineering.

By: J. Geddes n, J. Mehlsen * & M. Olufsen n

author keywords: Heart rate; Oscillators; Baroreflex; Blood pressure; Empirical mode decomposition; Measurement; Aging; Empirical mode decomposition (EMD); head-up tilt (HUT); postural orthostatic tachycardia syndrome (POTS); uniform phase empirical mode decomposition (UPEMD); clustering
MeSH headings : Baroreflex; Blood Pressure; Heart Rate; Humans; Postural Orthostatic Tachycardia Syndrome; Tilt-Table Test
topics (OpenAlex): Cardiovascular Syncope and Autonomic Disorders; Heart Rate Variability and Autonomic Control; Non-Invasive Vital Sign Monitoring
TL;DR: The 0.1 Hz phase response and oscillation amplitude metrics provide new markers that can improve Postural Orthostatic Tachycardia Syndrome diagnostic augmenting the existing diagnosis protocol only analyzing the change in HR. (via Semantic Scholar)
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Source: Web Of Science
Added: November 24, 2020

2020 article

Multi-Linear Population Analysis (MLPA) of LFP Data Using Tensor Decompositions

Geddes, J., Einevoll, G. T., Acar, E., & Stasik, A. J. (2020, September 8). Frontiers in Applied Mathematics and Statistics.

By: J. Geddes n, G. Einevoll*, E. Acar * & A. Stasik *

author keywords: tensor decompositions; neuroscience; local field potential (LFP); population rate model; CANDECOMP; PARAFAC; independent component analysis (ICA); principal component analysis (PCA)
topics (OpenAlex): Blind Source Separation Techniques; Tensor decomposition and applications; Advanced Neuroimaging Techniques and Applications
TL;DR: This work defines a neural network model and based on its dynamics, compute LFPs, and designs feed-forward population rate neuron models to match the structure of state-of-the-art, large-scale LFP simulations, but downscale them to allow easy inspection and interpretation. (via Semantic Scholar)
Source: Web Of Science
Added: August 16, 2021

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