[Multisegmental dynamic plethysmography for noninvasive study of venous function with special reference to exercise...

Area of Science:

• Vascular Medicine
• Physiology
• Medical Diagnostics

Background:

• Chronic venous incompetence (CVI) affects venous drainage, impacting lower limb circulation.
• Understanding venous hemodynamics during exercise is crucial for diagnosing CVI.
• Dynamic strain gauge plethysmography offers a method to assess venous volume changes.

Purpose of the Study:

• To evaluate multilevel dynamic strain gauge plethysmography in healthy subjects and CVI patients.
• To establish normal venous volume responses during specific exercises.
• To identify plethysmographic differences indicative of CVI.

Main Methods:

• Utilized multilevel dynamic strain gauge plethysmography in 22 healthy subjects and 26 CVI patients.
• Measured venous volume changes at foot, calf, and thigh levels during tip-toeing and kneebending exercises.
• Compared exercise-induced venous volume dynamics between healthy controls and CVI patients.

Main Results:

• Healthy subjects exhibited distinct venous volume patterns based on sensor-site and muscle-exercise correspondence, influenced by exercise hyperemia.
• CVI patients demonstrated significantly reduced venous volume decrease (p < 0.001) or even volume increase at the calf during exercise.
• No significant differences in venous volume changes were observed at the foot segment between groups.

Conclusions:

• Dynamic strain gauge plethysmography effectively differentiates venous hemodynamics in CVI.
• Calf and thigh measurements are valuable for CVI assessment, particularly in suspected iliac vein thrombosis.
• Further investigation with thigh measurements is recommended for evaluating intermittent venous claudication objectively.