The effect of very low dose pulsed magnetic waves on cochlea

Effect of 2.45 GHz Microwave Radiation on the Inner Ear: A Histopathological Study on 2.45 GHz Microwave Radiation and Cochlea

BACKGROUND

The present study aims to determine the possible low dose-dependent adverse effects of 2.45 GHz microwave exposure and Wi-Fi frequency on the cochlea.

METHODS

Twelve pregnant female rats (n=12) and their male newborns were exposed to Wi-Fi frequencies with varying electric field values of 0.6, 1.9, 5, 10 V/m, and 15 V/m during the 21-day gestation period and 45 days after birth, except for the control group. Auditory brainstem response testing was performed before exposure and sacrification. After removal of the cochlea, histopathological examination was conducted by immunohistochemistry methods using caspase (cysteine-aspartic proteases, cysteine aspartates, or cysteine-dependent aspartate-directed proteases)-3, -9, and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL). Kruskal-Wallis and Wilcoxon tests and multivariate analysis of variance were used.

RESULTS

Auditory brainstem response thresholds in postexposure tests increased statistically significantly at 5 V/m and above doses. When the number of apoptotic cells was compared in immunohistochemistry examination, significant differences were found at 10 V/m and 15 V/m doses (F(5,15)=23.203, P=.001; Pillai's trace=1.912, η2=0.637). As the magnitude of the electric field increased, all histopathological indicators of apoptosis increased. The most significant effect was noted on caspase-9 staining (η2 c9=0.996), followed by caspase-3 (η2 c3=0.991), and TUNEL staining (η2 t=0.801). Caspase-3, caspase-9, and TUNEL-stained cell densities increased directly by increasing the electric field and power values.

CONCLUSION

Apoptosis and immune activity in the cochlea depend on the electric field and power value. Even at low doses, the electromagnetic field in Wi-Fi frequency damages the inner ear and causes apoptosis.

Extraction of Aural Foreign Bodies in a Rural Setting: 10-Year Review and a Novel Method to Remove Magnetic Stones

BACKGROUND

The external auditory canal's unique anatomical characteristics made the presence of foreign bodies (FBs) a clinical challenge, particularly in rural settings without ready access to tertiary care and specialist intervention.

AIMS

Our study surveys the experience in aural FBs surgical management in a rural Australian tertiary center. It proposes a safe, easy, and affordable technique to remove stones from the ear canal.

METHODS

We have completed a 10-year retrospective surgical chart review, including 474 patients (52 adults and 428 children) requiring surgical management to remove aural FBs at the Royal Darwin Hospital, Northern Territory, Australia. We surveyed for patient demographics, foreign-body description, complications, location, and removal attempts. We identified what factors determine the need for surgical management and propose a technique for a safe, uncomplicated, and affordable removal of stones from the ear canal after applying this method in a small subgroup.

RESULTS

The most common FBs requiring surgery in children were stones. A predominance in the Aboriginal population from remote communities was found, leading to a nasal bridle magnet technique to remove stones in rural settings. This method reduces the number of extraction attempts of the most frequent FB found in children's ears, aiming to minimize complications, negative experiences, and health cost.

CONCLUSION

Contrary to international literature, stones were found to be the most common FB in remote aboriginal populations. The proposed technique reduces the number of extraction attempts of the most frequent FB found in children's ears, aiming to minimize complications, negative experiences, and health cost.