Offsetting Hippocampal Degeneration in m-sTBI

Not Applicable

Recruiting

• Conditions: Degeneration; Traumatic Brain Injury; Memory; Loss, Mild, Following Organic Brain Damage
• Interventions: Behavioral: Online Spatial Navigation Training

• Registration Number: NCT03727334
• Lead Sponsor: University of British Columbia

Brief Summary

The goal of this study is to establish the feasibility of an intervention designed to improve memory in patients who have experienced a moderate or severe traumatic brain injury (m-sTBI) and to examine its effect on brain structures.

Detailed Description

The purpose of this study is to establish the feasibility of a novel intervention, and explore biomarker predictors of neurodegeneration and response to the proposed intervention. This 16 week intervention utilises allocentric spatial navigation tasks to improve memory and counteract hippocampal neurodegeneration. This intervention will be administered in combination with neuropsychological assessments, MR imaging, and the analysis of genomic variants at two time points; 7 months post-TBI and 12 months post-TBI.

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study First Submitted: 2018-10-03
• Study First Submitted QC: 2018-10-30
• Study First Posted: 2018-11-01
• Study Start: 2019-07-25
• Status Verified: 2023-05
• Last Update Submitted: 2023-05-08
• Last Update Posted: 2023-05-09
• Primary Completion: 2023-07
• Study Completion: 2024-07

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 25

Inclusion Criteria

• An acute care diagnosis of TBI as determined by a medical professional, indicated by:

  • Post-traumatic amnesia duration of 24 hours or more, and/or lowest Glasgow Coma Scale score of < 13
  • Positive clinical CT or MRI scan

• Aged 18 to 65

• Fluent in English

• Have the competency for fully informed consent by 6 months post-injury

• Have basic computer skills

• Have functional use of one upper extremity

• Have access to the internet

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Exclusion Criteria

• A neurological disorder other than TBI (e.g., stroke, dementia, tumor, neurodevelopmental disorder) impairing baseline awareness, cognition, or validity of follow-up and outcome assessment.
• A systemic condition (e.g., lupus, diabetes, rheumatoid arthritis).
• Any contraindications to magnetic resonance imaging (MRI)
• You are experiencing language impairments (i.e., aphasia) from your injury

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Treatment	Online Spatial Navigation Training	For the treatment arm, the participants will complete the intervention protocol following the first in-person study visit 7 months post-injury. The intervention involves 16 weeks of online, in-home spatial navigation training. During the 16 weeks, the participant will complete exercises for 1 hour/day, 5 days a week.

Primary Outcome Measures

Name	Time	Method
Online Spatial Navigation Intervention Test Scores: Change in Pattern Completion	Time-point 1: 7 months post-injury and Time-point 2: 12 months post-injury	Measurement of pattern completion abilities are assessed in a task designed to probe pattern completion by presenting partial retrieval cues at different levels of degradation. The following variables are taken into account: i) accuracy for learned stimuli given as a percentage value (i.e., correctly selecting the name of the scene) ii) accuracy for new stimuli given as a percentage value (i.e., correctly indicating the stimuli is novel) and iii) bias measure. The bias measure is obtained by subtracting the learned stimuli accuracy score from the new stimuli accuracy score. An increase for both accuracy measures from pre- to post-intervention corresponds to improvement on recognition memory. An increase in bias measure reflects an increased tendency for pattern separation.
Online Spatial Navigation Intervention Test Scores: Change in Spatial Learning Ability	Time-point 1: 7 months post-injury and Time-point 2: 12 months post-injury	Participants complete online spatial navigation training 5 days per week for 16 weeks. Improvement in spatial learning ability will be assessed based on the accuracy of answers to questions regarding the reproduction of spatial elements, the direction and proximity of certain landmarks, and describing the most efficient route from point A to point B. Improvement will be assessed at the end of each week and at the end of the intervention. The raw scores range from 0-15, with higher scores indicating better spatial learning ability.
Online Spatial Navigation Intervention Test Scores: Change in Pattern Separation	Time-point 1: 7 months post-injury and Time-point 2: 12 months post-injury	Measurement of pattern separation abilities are assessed in a task requiring the participant to differentiate memories in order to prevent interference from overlapping details. The following three variables are taken into account: i) percent correct ii) the discriminating value and iii) bias metric. Percent correct and bias metric are given as a percentage values (e.g., 80.63%) and the discriminating variable is given as a raw rate (e.g., 0.67). An improvement in pattern separation abilities are determined by an increase in percent correct and discrimination values from pre- to post-intervention. An increase in bias metric from pre- to post-intervention reflects an increased tendency for pattern separation.
Online Spatial Navigation Intervention Test Scores: Change in Cognitive Map Formation	Time-point 1: 7 months post-injury and Time-point 2: 12 months post-injury	Participants complete online spatial navigation training 5 days per week for 16 weeks. Improvement in cognitive map formation will be assessed based on the number of trails required by the participant to learn landmark placements and based on the accuracy of the participant's navigation to a specific destination. The raw scores range from 1-21 and 0-10, respectively. A decrease in the number of trials required by the participant and an increase in navigation accuracy both correspond to an improvement in cognitive map formation.

Secondary Outcome Measures

Name	Time	Method
Neuronal injury biomarker predictors in serum and plasma samples	Time-point 1: 7 months post-injury and Time-point 2: 12 months post-injury	The investigators will be analysing biomarkers in serum and plasma samples in relation to traumatic brain injuries. This will allow the investigators to generate hypotheses concerning the relationship between blood biomarkers and neuronal injury. Serum neurofilament light chains (NF-L), total tau, amyloid β-40 and amyloid β-42 will be assayed using Quanterix reagents on the Simoa HD-1 platform.
Gliosis and inflammation biomarker predictors in serum samples	Time-point 1: 7 months post-injury and Time-point 2: 12 months post-injury	The investigators will be analysing biomarkers in serum samples in relation to gliosis and inflammation. This will allow the investigators to generate hypotheses concerning the relationship between blood biomarkers and neuroimmune response. Serum monocyte chemoattractant protein-1 (MCP-1) will be assayed using MesoScale Discovery reagents on the Sector S600 platform and glial fibrillary acidic protein (GFAP) will be assayed using Quanterix reagents on the Simoa HD-1 platform.

Trial Locations

Locations (2)

GF Strong Rehabilitation Centre; 🇨🇦 Vancouver, British Columbia, Canada

Vancouver General Hopsital; 🇨🇦 Vancouver, British Columbia, Canada