A rat model for acute limb ischemia using microsized gelatin beads.

Area of Science:

• Vascular Surgery
• Neurology
• Animal Models

Background:

• Acute limb ischemia (ALI) is a critical condition caused by sudden reduction in lower limb blood flow.
• Understanding the pathophysiological mechanisms of ALI is crucial for developing effective treatments.
• Existing models may not fully capture the complex neurological and muscular sequelae of ALI.

Purpose of the Study:

• To establish a reliable rat model of ALI using microsized gelatin beads.
• To investigate the resulting pathophysiological changes, including temperature, muscle weight, and nerve damage.
• To explore the relationship between ALI, autonomic neuropathy, and peripheral nerve injury.

Main Methods:

• Male Sprague-Dawley rats were administered low or high doses of microsized gelatin beads into the femoral artery.
• Control groups included normal saline, femoral artery cut (FAC), and sciatic nerve cut (SNC).
• Measurements included limb temperature, muscle weights, and ATF3 expression in sympathetic ganglia to assess nerve damage.

Main Results:

• Gelatin bead administration (Low and High dose) and FAC induced limb temperature decrease.
• Muscle atrophy was observed in the soleus and extensor digitorum longus (High dose, SNC) and gastrocnemius (all ALI groups).
• Increased ATF3-positive cells in sympathetic ganglia indicated significant nerve damage in High-dose and SNC groups.

Conclusions:

• A novel rat model for ALI was successfully established using microsized gelatin beads.
• The study suggests that autonomic neuropathy in ALI is associated with both muscle damage and peripheral neuropathy.
• This model provides a valuable tool for further research into ALI pathogenesis and therapeutic strategies.