Can the use of the CROS system provide head shadow effect contribution to unilateral Cochlear Implant Users?

Hoshino, Ana Cristina Hiromi; Goffi-Gomez, Maria Valéria Schmidt; Sierra, Paola Angelica Samuel; Agrawal, Smita; Rodriguez, Carina; Carvalho, Ana Claudia Martinho de; Tsuji, Robinson Koji

doi:10.1590/2317-1782/20212021071

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Sumário

Original Article • CoDAS 34 (5) • 2022 • https://doi.org/10.1590/2317-1782/20212021071 copy

Can the use of the CROS system provide head shadow effect contribution to unilateral Cochlear Implant Users?

O Sistema CROS pode oferecer contribuição do efeito sombra da cabeça a usuários de implante coclear unilateral?

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Purpose

The aim of this study was to evaluate the contribution of the CROS system on the head shadow effect in unilateral implant users.

Methods

Prospective cross-sectional study, approved by the ethics committee under protocol 2.128.869. Eleven adults with post-lingual deafness users of unilateral Advanced Bionics CI were selected. Speech recognition was evaluated with recorded words presented at 65dBA at 0^o azimuth and at 90^o on the side contralateral to the CI, with noise at 55dBA, using CI alone and CI + CROS system. The results were analyzed using paired t-test with a 0.05 alpha.

Results

The mean speech recognition scores were significantly better with CI + CROS in relation to the condition of CI alone (p <0.05, p <0.005 and p <0.005 respectively). In the presentation at 0^o azimuth, no significant differences were found.

Conclusion

Users of unilateral CI without useful residual hearing for the use of hearing aids or unable to undergo bilateral surgery can benefit from the CROS device for speech recognition, especially when the speech is presented on the side contralateral to the CI.

Keywords
Unilateral Cochlear Implant; Contralateral Routing of Signal; Speech Clarity; Ease of Listening; Head-shadow

Demographic variable	Parameter(s)	Data
Sex	Female	6
Sex	Male	5
Age (in years)	Median	47
Age (in years)	Min – max	29 - 55
Etiology (N)	Trauma	1
	Policondritis (autoimmune)	1
	Ototoxicity	1
	Unknown	8
Time of CI use (months)	Mean (SE)	35.36 (9.38)
Time of CI use (months)	Min – Max	6 – 113
Contralateral PTA (dBHL) ^* * unaided condition	Median	99.55 (4.39)
Contralateral PTA (dBHL) ^* * unaided condition	Min – Max	80 – 120
Speech recognition (%)	Median	91.82 (2.96)
Speech recognition (%)	Min – Max	70 – 100

	CI only		CI + CROS		p-value
	Mean (SE)	Min - max	Mean (SE)	Min - max
S₀N₀
Speech recognition scores (%)	53.45 (5.07)	20 - 80	53.09 (5.03)	24 - 76	0.9520
Clarity of speech ratings	3 (0.27)	2 – 5	2.91(0.29)	2 – 5	0.7560
Ease of listening ratings	2.81 (0.23)	2 – 4	2.73 (0.27)	1 – 4	0.7560
S_CROSN_CI
Speech recognition scores (%)	53.82 (4.33)	32 – 76	66.18 (4.59)	36 – 88	0.0134^* * statistical significance according to paired sample t-Test comparison
Clarity of speech ratings	2.64 (0.28)	1 – 4	3.73 (0.28)	3 – 5	0.0033*
Ease of listening ratings	2.36 (0.24)	1 – 4	3.36 (0.15)	3 – 4	0.0016*

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E-mail: revista@codas.org.br

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[1] Conflict of interests: nothing to declare.