Skin flap thickness and magnet strength in Cochlear implants.

The new CI600 series cochlear implants (Nucleus Profile™ Plus Series; CI) are more MRI (magnetic resonance imaging) compatible. The magnet's attraction force is lower, possibly posing a problem in patients needing a higher strength magnet due to increased skin thickness. This study aims to investigate the relationship between skin thickness and magnet strength in patients undergoing cochlear implantation. This cross-sectional study used data from 46 patients with cochlear implants. Data collected included age, body mass index, magnet strength used, pre-operative and post-operative imaging and skin thickness. There was a weak, positive correlation between magnet strength and skin thickness, which was not statistically significant ((46) = 0.149,  = 0.324). There was a weak, positive correlation between magnet strength and body mass index, which was not statistically significant ((46) = 0.113,  = 0.456). There was a moderate, positive correlation between body mass index and skin thickness, which was statistically significant ((46) = 0.362,  = 0.012). The increased skin thickness in patients with higher body mass indexes, might mean that these patients will require a stronger magnet. There are concerns that the lower attraction force in the CI600 (Nucleus Profile™ Plus Series) may pose a retention problem for these patients. This might mean that discussions about skin flap reduction surgery are needed.