Leech therapy and bleeding wound techniques to relieve venous congestion

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Vascular Surgery

Background:

• Restoring capillary blood flow is crucial for tissue viability in reconstructive surgery, particularly for flaps and replants.
• Venous occlusion and methods promoting bleeding are explored to enhance perfusion.
• Leech therapy is a traditional method for improving blood flow.

Purpose of the Study:

• To compare the effectiveness of leech therapy versus wound creation in temporarily restoring capillary skin blood flow.
• To evaluate the perfusion restoration over a two-hour period in a simulated distal finger replant model.

Main Methods:

• Application of medicinal leeches (Hirudinea) to induce bleeding.
• Creation of a dermal wound to promote bleeding.
• Monitoring of capillary blood flow restoration and perfusion levels over two hours.
• Comparison with local heparin injection and punch wound techniques.

Main Results:

• Leech application initially showed the greatest restoration of capillary flow compared to other methods.
• Perfusion levels peaked during leech feeding and decreased significantly after satiation.
• All tested exsanguination techniques, including leech therapy, resulted in very low perfusion over the two-hour study period.
• Flow rates after leech satiation approximated those achieved with heparin injection and punch wounds.

Conclusions:

• While leeches offer a temporary increase in flap perfusion, their effectiveness is limited and short-lived.
• Current exsanguination techniques, including leech therapy, provide insufficient perfusion for critical tissue survival in complex reconstructions like finger replants.
• Further research is needed to develop more effective and sustained methods for restoring capillary blood flow in compromised tissues.