TABLE 1

Evaluating the severity of postthrombotic syndrome (PTS): The Villalta-Prandoni scale

	No PTS	Mild	Moderate	Severe
Symptoms
Pain	0	1	2	3
Cramps	0	1	2	3
Heaviness	0	1	2	3
Paresthesia	0	1	2	3
Pruritus	0	1	2	3
Clinical signs
Pretibial edema	0	1	2	3
Skin induration	0	1	2	3
Hyperpigmentation	0	1	2	3
Redness	0	1	2	3
Venous ectasia	0	1	2	3
Pain on calf compression	0	1	2	3
Venous ulcer	Absent			Present
Severity score
None < 5
Mild 5-9
Moderate 10-14
Severe > 14, with or without venous ulcer