Cochlear SPrint Sound Processor Informações Técnicas descarregar pdf (Página 12)

SECTION ONE | CLINICAL GUIDANCE

1.1.3 NRT/Objective Preset Method

The NRT/objective preset method offsets the T- and C-level proﬁles from the

objective measurement proﬁle. Additional MAPs are created with the C-levels

set progressively higher on each MAP. This method is appropriate for very

young children or others who may not give any reliable behavioural responses.

1. Measure impedances by performing an implant test.

2. Obtain objective measures (the default is Neural Response Telemetry)

in the operating room or during the programming session using the

AutoNRT function in Custom Sound or using Custom Sound EP software.

To measure NRT in Custom Sound, select “Perform AutoNRT” under the

programming tasks. By default, the software automatically measures

T-NRT on channels 22, 16, 11, 6, and 1 using an ascending approach and

built-in detection algorithm. (You may select other channels.) T-NRTs

are saved automatically. Alternatively, you can use T-NRT measurements

from Custom Sound EP.

3. In the Select MAP screen, create a new MAP by selecting the required

MAP parameters from the available drop-down menus and clicking

Create. Alternatively, you can select and open an existing MAP that you

can modify.

4. The default streamlined Programming channels 22, 16, 11, 6, and 1 are

highlighted. In the Method box, click the “Select NRT/objective Levels”

button. Select the measurement type (e.g. NRT), the values you wish

to use from the “date of measurement” and click Ok ( more than one

set of measurements may be selected.). This brings the T-NRT values

(blue markers) on the measured channels into the Set Levels screen.

Alternatively, in the Set Levels screen you may click and drag the blue

T-NRT markers up to the T-NRT values.

5. Select “NRT/Objective Preset Method” in the Programming method box.

6. The software automatically interpolates between T-NRT measurements

and creates the ﬁrst NRT MAP with T-levels set 40 CL below T-NRT and

C-levels set 10 CL above T-level (i.e. C-level offset of 30 CLs). Custom

Sound automatically creates three additional MAPs with C-levels set

10 CLs higher in each MAP. Each MAP has T-levels set 40 CLs below

T-NRT and DRs of 10, 20, 30 and 40 CLs respectively. In other words, the

loudest MAP has C-levels set to T-NRT.

7. Data collected during the European and Melbourne System four studies

were analysed to determine the relationship between T-NRT and

behavioural C-level at the ACE/ACE(RE) stimulation rates. For each rate,

signiﬁcant variability was observed across individuals with respect to

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