Neuropathologic damage induced by radiofrequency ablation at different temperatures

Area of Science:

• Neuroscience
• Biomedical Engineering
• Pathology

Background:

• Radiofrequency ablation (RFA) is widely used in medical procedures.
• Understanding the precise molecular mechanisms of RFA-induced neuropathologic damage is crucial for optimizing treatment safety and efficacy.
• Investigating the impact of varying temperatures during RFA is essential for predicting and mitigating nerve injury.

Purpose of the Study:

• To elucidate the molecular mechanisms underlying neuropathologic damage induced by radiofrequency ablation at different temperatures.
• To assess the correlation between RFA temperature and the degree of nerve injury.
• To identify key proteins involved in RFA-induced nerve damage.

Main Methods:

• Basic research utilizing a rat model (n=36) with induced neuropathological injury.
• Rats were exposed to RFA at temperatures ranging from 42°C to 67°C in 5°C increments.
• Nerve conduction parameters, histopathological changes (HE staining), and protein expression (SCN9A, SCN3B, NFASC via Western blot) were analyzed.

Main Results:

• Nerve conduction velocity decreased progressively with increasing RFA temperature.
• Significant neuronal damage and degeneration were observed at 67°C and increased with temperature from 47°C upwards.
• Expression of SCN9A and SCN3B proteins increased, while NFASC protein expression decreased at higher temperatures (57°C, 62°C, 67°C).

Conclusions:

• A positive correlation exists between RFA temperature and the severity of neuropathologic damage.
• The underlying mechanism involves heat transfer injury affecting nerve tissue.
• Changes in the expression of SCN9A, SCN3B, and NFASC proteins are critically involved in RFA-induced neuropathologic damage.