Rhabdomyolysis due to pulsed electric fields

Area of Science:

• Biophysics
• Electrophysiology
• Skeletal Muscle Physiology

Background:

• High-voltage electrical trauma causes extensive skeletal muscle destruction, often attributed to thermal damage.
• Emerging evidence suggests electroporation, a nonthermal mechanism, also contributes to muscle damage and rhabdomyolysis.

Purpose of the Study:

• To determine the threshold electrical field strength and exposure duration for electroporation-induced rhabdomyolysis in skeletal muscle.
• To investigate the role of electroporation as a primary mechanism in electrical injury.

Main Methods:

• Computer simulation of high-voltage electric shock.
• Application of short-duration, high-intensity electric field pulses to intact skeletal muscle.
• Measurement of electrical impedance changes as an indicator of membrane damage.
• Confirmation of structural defects using electron microscopy.

Main Results:

• A decrease in muscle tissue impedance magnitude was observed above threshold values of 60 V/cm and 1-ms duration.
• Field strength, pulse duration, and pulse number significantly influenced the extent of damage.
• Electron microscopy confirmed membrane structural defects caused by electric field pulses.

Conclusions:

• Electroporation is a significant nonthermal mechanism contributing to skeletal muscle damage and rhabdomyolysis in electrical injuries.
• Specific thresholds for electrical field strength and pulse duration are identified for electroporation-induced rhabdomyolysis.
• These findings provide the first clear demonstration of electroporation causing rhabdomyolysis in intact muscle.