NHCA 2021 Virtual Conference has ended
Welcome to the 2021 NHCA Virtual Conference Schedule, below you will find the schedule listed with 3 types of education sessions, Live Platform, Pre-recorded Platform and E-Poster Sessions. They will all be delivered a little differently so please take a little time to read the descriptions and understand how the conference will be laid out.

  • Live Platforms: NHCA is offering 7 live sessions with interactive Q&A and chat features over the two days of the live conference. If you are not able to watch these sessions live they will be recorded and playback will be available until March 19, 2021
  • ON DEMAND Pre-Recorded Platforms: There will be 28 pre-recorded sessions that will be released on the first day of the conference, these will be available to watch at your leisure and will be available until March 19, 2021. PLEASE NOTE: They are available longer than the 1-5 pm time on the schedule but we are not able to program them in like that!
  • ON DEMAND E-Poster Sessions: There will be 8 E-Poster sessions available to watch, each session is 15 minutes long and worth a quarter of a credit, in order to receive a full hour you will need to watch 4 poster sessions all the way through and complete and evaluation. These will be available as pre-recordings and will be available from the start of the conference until March 19, 2021
This means you have the opportunity for up to 19.0 CE credits at this years conference! (See ASHA AND AAA Brand Blocks below)

If you are trying to login to the learning center to attend the conference, please CLICK HERE to go to the Learning Center, this is just a digital agenda!
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Saturday, February 27 • 2:00pm - 2:30pm
ON DEMAND SESSION:Threshold Shift Susceptibility Correlated with Pre-Cochlear Amplification in Chinchilla

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Background: Without sufficient understanding of individual differences in noise-induced hearing loss (NIHL) susceptibility, it is difficult to create accurate and effective healthcare guidelines for NIHL-risk. In humans, the transfer function of the open ear (TFOE) and the transfer function of the ear canal (TFEC), two measures of pre-cochlear amplification (PCA), range from 5-19 dB-A. This variety in PCA suggests individuals with the highest PCA are likely to be 3-4x more susceptible to NIHL than those with the lowest PCA. Objective: We tested the hypothesis that higher PCA is correlated with higher NIHL susceptibility following a hazardous noise exposure in an animal model. Design: Five chinchillas were exposed to 89 dB-SPL of 4 kHz octave-band noise for 24 hours. Auditory brainstem response (ABR) thresholds were obtained pre-exposure and post-exposure. The relationships between subject’s PCA (TFOE and TFEC) and severity of ABR threshold shift were analyzed. Results: A strong correlation was found between TFEC and ABR threshold shift (animals with higher TFEC exhibited more threshold shift). Body weight and ABR threshold shift were also strongly correlated (smaller animals exhibited more threshold shift). Body weight may serve as a proxy metric for TFEC, as these factors were also found to be strongly correlated.

Learning Objectives:
As a result of this Continuing Education Activity, readers will be able to:
1) Understand the external ear's role in amplification
2) Understand that in-ear noise dose varies significantly after accounting for pre-cochlear amplification
3) Understand the current human and animal data that suggest that PCA has a significant effect on individual susceptibility to NIHL

avatar for Sarah Grinn

Sarah Grinn

Professor, Central Michigan University
Dr. Sarah K. Grinn is an assistant professor in the Division of Audiology at Central Michigan University. Dr. Grinn's research lab is focused on improving the accuracy of a model that predicts individual noise-induced hearing loss susceptibility by examining the role of external-ear... Read More →

Saturday February 27, 2021 2:00pm - 2:30pm CST