Purpose: The purpose of this study is to compare air-plethy-smogram results between primary varicose vein and venous ulcer patients who had hemodynamic reflux only in great saphenous vein (GSV) pathology and also differentiate the morphologic characteristics of sapheno-femoral junction with duplex scan. Method: Patients who had pathology other than primary reflux of GSV was excluded as thrombus, deep vein path-ology. Group 1 for primary varicose vein, group 2 for venous ulcer patients and each was 28 patients equally. Standard protocol for air-plethysmogram was done and the diameter of GSV (GSVD), SFJ, femoral vein (FVD) and the ratio of each value-GSV/FV (GFDR) and SFJ/FV (JFDR)- were measured by color-flow duplex scanning. Result: Venous filling index (VFI) showed statistically sig-nificance between two groups which was 4.89±0.64 in group 2 and 3.21±0.35 in group (P value 0.02). But other para-meter ejection fraction (EF), and residual volume fraction (RVF) was not different significantly in two groups. The mean value of great saphenous vein, femoral vein and sapheno- femoral junction was showed no differences. Conclusion: VFI of air-plethysmogram was considered signi-ficant differentiate parameter between primary varicose vein and venous ulcer origin GSV reflux. And it could be consi-dered as prognostic parameter for venous ulcer. There is no size differences in GSV, sapheno-femoral junction. It means there is more than anatomic factor in progression of chronic venous disease.

Keywords: Varicose vein, Venous ulcer, Air-plethysmogram, Duplex scan