Role of auditory brain function assessment by SPECT in cochlear implant side selection

Area of Science:

• Neuroscience
• Audiology
• Medical Imaging

Background:

• Pre-surgical evaluation for cochlear implantation in pre-lingually deaf adults presents challenges.
• Assessing post-operative functional outcomes requires reliable pre-operative indicators.

Purpose of the Study:

• To determine the benefits of Single Photon Emission Tomography (SPECT) in the pre-surgical evaluation of pre-lingually deaf adults.
• To investigate the relationship between brain activity, SPECT findings, and hearing performance post-cochlear implantation.

Main Methods:

• Brain SPECT was performed on 7 pre-lingually deaf patients under baseline and acoustic stimulation conditions.
• Semi-quantitative analysis of cortical perfusion in temporal cortices was conducted.
• Correlation between SPECT-measured brain activation and post-operative auditory perception was analyzed.

Main Results:

• SPECT revealed inter-hemispherical asymmetry in temporal cortical activation.
• Patients preferred cochlear implantation on the side with higher activation.
• A significant correlation was found between SPECT activation and post-operative hearing performance, particularly for medium-high frequencies.

Conclusions:

• Brain SPECT may be a valuable tool for evaluating deaf patients considered for cochlear implantation.
• SPECT provides functional assessment of the auditory cortex in pre-lingually deaf individuals.
• Further research, potentially using electrical stimulation, is needed to confirm SPECT's utility and expand its application.