Venous duplex scanning of the leg: range, variability and reproducibility

Area of Science:

• Vascular Ultrasound
• Venous Hemodynamics
• Medical Imaging

Background:

• Limited data exists on normal venous duplex ultrasound values, variability, and reproducibility.
• Establishing these parameters is crucial for accurate diagnosis of venous disorders.

Purpose of the Study:

• To measure the range and variability of venous diameter, compressibility, flow, and reflux in healthy individuals.
• To determine the reproducibility of these venous measurements.

Main Methods:

• Duplex ultrasound scans were performed on 42 healthy individuals (42 limbs, 714 vein segments).
• Intra-observer variability was assessed in 11 healthy individuals (187 segments).
• Inter-observer variability was evaluated in 15 healthy individuals (255 segments) and 13 deep venous thrombosis patients (169 segments).

Main Results:

• 99% of normal vein segments were traceable; 95% were compressible, and 98% showed flow.
• Proximal vein reflux duration was <1.0s (except common femoral vein); distal reflux was <0.5s (except distal long saphenous vein).
• Inter-observer agreement for compressibility (kappa=0.77) and reflux (kappa=0.86) in patients was good.

Conclusions:

• Normal venous duplex ultrasound values for diameter, compressibility, flow, and reflux have been established.
• Almost all veins are compressible in healthy individuals, with specific reflux time limits for proximal and distal segments.
• The study confirms good inter-observer reproducibility for key venous measurements, vital for clinical application.