Studies of pathologic vasoconstriction (vasospasm) in microvascular surgery

Area of Science:

• Vascular Surgery
• Pharmacology
• Anesthesiology

Background:

• Microvascular spasm is a critical complication in vascular surgery.
• Effective resolution strategies are essential for patient outcomes.

Purpose of the Study:

• To investigate methods for characterizing and resolving microvascular spasm.
• To evaluate the efficacy of local anesthetics in resolving vasospasm.

Main Methods:

• Analysis of 170 studies involving rat tail or femoral arteries.
• Induction of vasospasm using topical epinephrine.
• Application of topical vasodilators, including lidocaine (Xylocaine) and bupivacaine (Marcaine).
• Assessment of vessel dissection and adventitial stripping techniques.

Main Results:

• Topical epinephrine reliably induced vasospasm.
• Local anesthetics demonstrated a concentration-dependent ability to resolve vasoconstriction.
• 20% lidocaine (Xylocaine) was the most effective agent studied.
• Extensive vessel dissection and adventitial stripping significantly improved spasm resolution.

Conclusions:

• High-concentration lidocaine is effective in resolving microvascular spasm.
• Surgical techniques like adventitial stripping enhance spasm resolution.
• Further research into anesthetic concentrations and surgical adjuncts is warranted.