Investigating the Neurobiology of Tinnitus
The investigators hypothesize that individual differences exist in resting-state cortical attention, control, sensory, and emotion networks prior to noise exposure and these differences predispose some to the development of bothersome tinnitus. Furthermore, the investigators hypothesize that these changes in functional connectivity of these vulnerable systems after noise exposure are responsible for tinnitus. The proposed study will use a case-control cohort study design. Cases will be those soldiers who develop tinnitus and controls will be those who do not. This will be the first prospective study of tinnitus and will provide important information about the neurobiology of tinnitus.
If a cortical neural network etiology for bothersome tinnitus is confirmed, it will be an astounding, powerful, paradigm shifting model for the diagnosis, prevention and, most importantly, treatment of tinnitus. Furthermore, if a battery of neurocognitive tests can identify soldiers at risk for the development of tinnitus then appropriate primary prevention strategies can be introduced.
There are three Specific Aims to this project.
Specific Aim 1. To determine if soldiers who develop tinnitus display pre-deployment differences in a set of physical, functional, cognitive, vulnerability, perpetuating factors, pre-deployment neurocognitive scores, or neuroimaging features compared to soldiers who do not develop tinnitus ("control group").
Specific Aim 2. To determine if particular scores on neurocognitive tests or neuroimaging features of functional/structural connectivity networks are associated with the development of tinnitus.
Specific Aim 3. To identify a set of pre-deployment physical, functional, cognitive, vulnerability, and perpetuating factors, neurocognitive responses, and neuroimaging features that are associated with the development of tinnitus.
The investigators plan to recruit 200 soldiers, between the ages of 18 and 30 years who do not have hearing loss or tinnitus and have never been deployed to military theater. The soldier participants will undergo a variety of tests before and after deployment, which will include a hearing test, neurocognitive tests (i.e., brain function tests), and a variety of novel radiologic imaging studies of the brain. One of these novel radiologic imaging studies is functional connectivity Magnetic Resonance Imaging, a proven methodology that monitors changes in brain activity and connections based on blood flow between different brain areas and levels of consumption of oxygen. This information is used to describe the condition of important neural networks responsible for such things as attention, mood, sensation, vision, hearing, and introspection or self-contemplation.
Traumatic Brain Injury
Post Traumatic Stress Disorder
|Study Design:||Observational Model: Case Control
Time Perspective: Prospective
|Official Title:||Investigating The Neurobiology of Tinnitus|
- Development of Tinnitus [ Time Frame: Post-deployment assessment will occur no sooner than 90 days from return from active military theater. ] [ Designated as safety issue: No ]The presence of tinnitus will be based on the participants' responses to questions 8a, 9c, and 9d of the Post-Deployment Health Assessment (PDHA).
- Mild Traumatic Brain Injury [ Time Frame: Post-deployment assessment will occur no sooner than 90 days from return from active military theater. ] [ Designated as safety issue: No ]Mild Traumatic Brain Injury - Ohio State University TBI Identification Method (OSU TBI-ID version 12-10-08)(Corrigan and Bogner 2007)
- Post Traumatic Stress Disorder [ Time Frame: Post-deployment assessment will occur no sooner than 90 days from return from active military theater. ] [ Designated as safety issue: No ]Subjects whose military medical record or PDHA suggests PTSD will be asked to complete the Clinician Administered PTSD Scale (CAPS).(Blake et al. 1995; Weathers and Litz 1994)
|Study Start Date:||September 2014|
|Estimated Study Completion Date:||June 2017|
|Estimated Primary Completion Date:||June 2017 (Final data collection date for primary outcome measure)|
The absence of tinnitus will be based on the participants' responses to questions 8a, 9c, and 9d of the Post-Deployment Health Assessment (PDHA).
The presence of tinnitus will be based on the participants' responses to questions 8a, 9c, and 9d of the Post-Deployment Health Assessment (PDHA).
Please refer to this study by its ClinicalTrials.gov identifier: NCT01294124
|Contact: Joyce R. Nicklaus, RN,BSN,CCRCfirstname.lastname@example.org|
|United States, California|
|Naval Medical Center||Not yet recruiting|
|San Diego, California, United States, 92134|
|Contact: Sara Murphy, MPH 619-532-6820 email@example.com|
|Principal Investigator: Michael Hoffer, CAPT, MD|
|United States, Missouri|
|Washington University School of Medicine||Not yet recruiting|
|St. Louis, Missouri, United States, 63110|
|Contact: Joyce Nicklaus, RN, BSN 314-362-7508 firstname.lastname@example.org|
|Principal Investigator: Jay F Piccirillo, MD, CPI|
|Principal Investigator:||Jay F. Piccirillo, MD||Washington University School of Medicine|
|Principal Investigator:||Michael Hoffer, CAPT., M.D.||United States Naval Medical Center, San Diego|