A simple plethysmographic method for differentiating primary from secondary varicose veins

Area of Science:

• Vascular Surgery
• Physiology
• Medical Diagnostics

Background:

• Varicose veins are a common venous disorder affecting leg circulation.
• Accurate preoperative assessment is crucial for determining the appropriate surgical intervention.
• Understanding venous hemodynamics is key to diagnosing venous insufficiency.

Purpose of the Study:

• To evaluate the utility of calf muscle pump function assessment in differentiating varicose vein types.
• To correlate venous return time and venous reflux flow with venous pressure measurements.
• To assess the method's applicability in distinguishing primary versus secondary varicose veins.

Main Methods:

• Strain gauge plethysmography was used to measure calf volume changes after muscle contractions in 81 normal legs and 98 with varicose veins.
• Key parameters measured included venous return time (seconds) and venous reflux flow (ml/100ml/min).
• The effect of external compression on venous flow characteristics was assessed in patients with superficial venous insufficiency and perforating vein issues.

Main Results:

• Normal venous return time was 21.9±6.7s, significantly shorter (6.9±2.9s) in varicose vein patients.
• Venous reflux flow was inversely correlated with venous return time (11.4±4.9 vs. 22.3±7.3).
• Compression normalized venous flow in superficial insufficiency but not in perforating vein or deep valve issues.

Conclusions:

• Calf muscle pump assessment via venous return time and reflux flow effectively differentiates primary and secondary varicose veins.
• The method provides valuable preoperative data to guide surgical strategy.
• This technique is easily applicable for clinical diagnostic purposes.