Pneumatic tourniquet application and nerve integrity: motor function and electrophysiology

Area of Science:

• Neuroscience
• Physiology
• Animal Models

Background:

• Tourniquet use can cause nerve damage.
• Understanding the impact of tourniquet pressure and duration on sciatic nerve injury is crucial.

Purpose of the Study:

• To evaluate the effects of tourniquet application and sciatic nerve vascular manipulation on limb motor function and electrophysiology in a rat model.
• To determine the relationship between tourniquet pressure, duration, and nerve injury severity.

Main Methods:

• Rats were subjected to pneumatic tourniquet compression (200-400 mm Hg for 1-3 h) or sciatic nerve vascular manipulation.
• Limb motor function, leg girth, spontaneous potentials, and compound muscle action potentials were assessed.
• Electrophysiologic data were analyzed to correlate injury with pressure and duration.

Main Results:

• Both tourniquet compression and vascular manipulation led to motor function deficits lasting weeks.
• Leg girth initially increased then decreased in compressed limbs; vascular manipulation caused delayed girth reduction.
• Reduced compound muscle action potentials and presence of spontaneous potentials indicated nerve injury, most severe at 1 week post-treatment.

Conclusions:

• Tourniquet application and sciatic nerve vascular manipulation induce persistent motor and electrophysiologic deficits in rats.
• Nerve injury severity is independently and additively influenced by tourniquet pressure magnitude and compression duration.
• The findings provide insights into tourniquet-induced nerve injury mechanisms and recovery potential.