Nonsimultaneous Rapid Pulse Trains (RaPiT) with Current Steering for Loudness Integration as a Basis for a new Loudness Encoding Strategy in Cochlear Implant Subjects

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

NL-OMON

Registry ID

NL-OMON20838

Enrollment

Registered

2020-09-08

Start date

2020-10-04

Completion date

Unknown

Last updated

2024-02-28

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hearing Impared

Interventions

All subjects will undergo loudness balancing and loudness ranking procedures to objectively assess the loudness growth functions. Subjective assessment of sound quality will also be measured.

Eligibility

Inclusion criteria

Inclusion criteria: Adult CI users Subjects with implantation of CI at least nine months prior to date of measurement Subjects perform at least 70% at CNC speech test (consonant-noun-consonant) at last clinical measurement

Exclusion criteria

Exclusion criteria: Subjects who are unable to complete a consecutive 3 hours of testing due to medical circumstances or otherwise Subjects with severe tinnitus Subjects with hyperacusis

Design outcomes

Primary

Measure	Time frame
To discover the optimal pulse characteristics for controlled loudness growth with rapid pulse trains leading to a single pitch percept and eventually towards understanding of speech. We will create and evaluate loudness curves for multiple sequentially steered modalities. In the first stage, we will look at pulse characteristics for loudness balancing like pulse amplitudes at threshold level (TL) and most comfortable level (MCL), pulse width, amount of sequential pulses, interpulse interval (IPI) and physical space between stimuli for the different modalities. In the second stage, we will evaluate loudness growth by matching and ranking the experimental modalities in comparison to monopolar stimulation (MP).	—

Measure

Time frame

To discover the optimal pulse characteristics for controlled loudness growth with rapid pulse trains leading to a single pitch percept and eventually towards understanding of speech. We will create and evaluate loudness curves for multiple sequentially steered modalities. In the first stage, we will look at pulse characteristics for loudness balancing like pulse amplitudes at threshold level (TL) and most comfortable level (MCL), pulse width, amount of sequential pulses, interpulse interval (IPI) and physical space between stimuli for the different modalities. In the second stage, we will evaluate loudness growth by matching and ranking the experimental modalities in comparison to monopolar stimulation (MP).

—

Secondary

Measure	Time frame
Subject characteristics possibly influencing loudness growth or discrimination abilities like electrode position in the cochlea, recent CVC scores, demographics and duration of deafness.	—

Contacts

Public ContactNicolaas van Groesen

LUMC

n.r.a.van_groesen@lumc.nl0715261179

Outcome results

None listed

Source: NL-OMON (via WHO ICTRP)