Cochlear SPrint Sound Processor Informações Técnicas descarregar pdf (Página 73)

CLINICAL GUIDANCE | SECTION TWO

Note: It is recommended to maximize perceptual abilities wherever possible.

This is because ABI performance is generally low at ﬁrst.

To MAP an ABI recipient:

1. To ﬁnd the receiver / stimulator, palpate the area or check for a tattoo

(if used).

2. Use Custom Sound to connect to the receiver / stimulator.

3. If the recipient has no internal magnet, start testing with a headband, and

then shave the scalp for the retainer disk.

4. Perform an impedance test when all T- and C- levels have been checked.

5. Review the possible outcomes with the ABI recipient.*

*Typical ABI outcomes: Auditory sensations only (5%), Auditory plus non-auditory sensations

(86%), Non-auditory sensations only (9%)

6. Start in the middle of the array (i.e. MP1+2) and measure T- and C- levels.

7. Attempt to use only channels with no side effects.

8. Perform a loudness balance.

9. Assess electrode speciﬁc pitch.

10. Remove electrodes that do not sound distinct in pitch

11. Double-up channels, if required to create a sufﬁciently wide

frequency allocation

12. Use a psychophysical summary sheet to track the following:

• electrodes tested;

• stimulation mode;

• type (and quality) of sensations (i.e auditory / non-auditory);

• magnitude (i.e. pitch / non-auditory sensations).

Note: Deactivate problem electrodes on screen.

Common MAPping outcomes

The following are common MAPping outcomes for ABI recipients:

• The number of useable electrodes is typically between 11 – 14;

• Side effects are more often found on medial (deeply inserted / higher

numbered) electrodes;

• Wide pulse widths are often required;

• There are approximately 6 – 11 distinctive pitches;

• Most channels are in mid-pitch range.

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