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Lack of tourniquet effect of below-knee stockings
Chauveau M, Vin F, Houot B
Phlebology 2000 Jun;15(2):60-63
clinical trial
4/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVE: To determine whether below-knee compression stockings impede venous return by a tourniquet effect. DESIGN: Randomised, cross-over clinical trial. PATIENTS: Ten outpatient women suffering from mild or moderate primary varicose veins without skin trophic disorder. METHODS: Air plethysmography with venous occlusion (50 mmHg) was used to measure aterial inflow (AI), venous volume (V50) and maximum venous outflow (MVO), without stockings and wearing French class 1 (10 to 15 mmHg) and class 2 (15 to 20 mmHg) below-knee stockings. RESULTS: No carry over due to the cross-over design was detected. There was no significant variation in MVO induced by class 1 (44 versus 45 ml/s) or class 2 (42 versus 41 ml/s) stockings. AI decreased significantly with class 2 (0.93 versus 1.22 ml/s, p = 0.012) but not with class 1 (1.22 versus 1.20 ml/s) stockings. V50 did not change with class 1 (97 versus 95 ml) but decreased with class 2 (80 versus 98 ml, p = 0.031) stockings. CONCLUSION: No tourniquet effect of class 1 and class 2 below-knee stockings was observed. Venous capacity and arterial flow were reduced by class 2 stockings.

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