Duplex saphenous vein mapping: venous occlusion and dependent position facilitate imaging

Area of Science:

• Vascular Surgery
• Medical Imaging
• Ultrasound Technology

Background:

• Preoperative assessment of the greater saphenous vein is crucial for vascular procedures.
• Optimal vein distention is necessary for accurate duplex ultrasound evaluation.
• Current methods may not consistently achieve adequate venous caliber for imaging.

Purpose of the Study:

• To develop and validate an optimal technique for greater saphenous vein distention.
• To enhance the quality of preoperative duplex assessment of the saphenous vein.
• To identify methods for maximizing vein diameter and circumference for imaging.

Main Methods:

• Utilized an Acuson 128 scanner with a 7.5-MHz sector probe.
• Assessed 20 male volunteers under various conditions: horizontal, with tourniquet, reversed Trendelenburg, and combined.
• Measured greater saphenous vein diameters and circumferences 10 cm above and below the knee.

Main Results:

• The combination of dependent position and tourniquet inflation (40 mm Hg) yielded significantly greater vein distention compared to dependency alone (p=0.004).
• Maximal vein diameters and circumferences were substantially increased with the combined technique.
• Blinded sonographer measurements minimized interpretation bias.

Conclusions:

• The combined technique of leg dependency and tourniquet inflation to 40 mm Hg is an optimal method for greater saphenous vein distention.
• This approach facilitates improved greater saphenous vein imaging during preoperative duplex assessment.
• The findings provide a practical and effective strategy for enhancing venous visualization.