Comparison between NRT-based MAPs and behaviourally measured MAPs at different stimulation rates--a multicentre...

Area of Science:

• Audiology
• Neuroscience
• Biomedical Engineering

Background:

• Cochlear implant (CI) technology aims to restore hearing by bypassing damaged cochlear structures.
• Electrically Evoked Compound Action Potential (ECAP) measurements are crucial for programming CI devices.
• Neural Response Telemetry (NRT) and behavioral mapping (MAP) are key techniques for CI fitting.

Purpose of the Study:

• To compare the performance of NRT-based MAPs with behavioral MAPs in adult cochlear implant recipients.
• To investigate the accuracy of predicted T/C levels using an NRT-based correction factor.
• To evaluate T/C levels at different stimulation rates in behavioral MAPs against NRT-based predictions.

Main Methods:

• A multicentre trial involving 17 adult subjects using cochlear implants.
• Development of an NRT-based MAP utilizing a correction factor based on ECAP thresholds (T-NRT).
• Evaluation of speech discrimination using CNC words and sentences for both NRT-based and behavioral MAPs.

Main Results:

• Variations in T/C (Threshold/Comfort) levels were observed across all tested MAPs.
• No statistically significant differences were found in speech discrimination scores between behavioral and NRT-based MAPs.
• The study assessed T/C levels in behavioral MAPs at varying stimulation rates.

Conclusions:

• NRT-based MAPs and behavioral MAPs demonstrate comparable performance in speech discrimination for adult cochlear implant users.
• The NRT-based approach, while showing T/C level variations, did not lead to a significant performance deficit.
• Further research may explore optimal NRT-based programming strategies and their long-term effects.