Contractile function of human veins after long-term storage in different media

Area of Science:

• Vascular Biology
• Organ Preservation
• Surgical Research

Background:

• Human saphenous veins are crucial for bypass grafting.
• Long-term storage of veins is challenging.
• Preserving contractile function is key for graft viability.

Purpose of the Study:

• To evaluate contractile function preservation in human saphenous veins after cold storage.
• To compare storage efficacy of different solutions: Krebs-Henseleit, Bretschneider's cardioplegic solution, heparinized blood, and albumin solution.
• To determine optimal storage duration and solution for vein preservation.

Main Methods:

• Human saphenous vein segments were stored for 36 and 96 hours at low temperatures.
• Contractile function was assessed using a vessel myograph.
• Responses to potassium chloride (KCl), norepinephrine (NE), and nitroglycerin (NTG) were measured.

Main Results:

• Storage in 5% albumin abolished KCl and NE responses after 36 hours.
• Heparinized blood reduced contraction to 24% (KCl) and 16% (NE) after 36 hours.
• Bretschneider's solution maintained 82% KCl and unchanged NE response after 36 hours.
• All solutions showed marked impairment of contractile function after 96 hours.
• Nitroglycerin consistently induced complete relaxation.

Conclusions:

• Bretschneider's cardioplegic solution significantly preserves human saphenous vein contractile function for up to 36 hours.
• This solution shows potential for enabling long-term storage of vessels for transplantation, bypass grafts, and research.
• Further research may optimize storage protocols using Bretschneider's solution.