The Perthes test on varicose veins. The leg receives an elastic band and the patient walks a few steps, we observe if the veins wilt. This is because the flow leak from a deep-superficial connection in the thigh (non-physiological way) was closed with the band, The blood re-entered by a superficial-deep connection in the leg (physiological sense) where the P was drawn. We use the test to predict the cosmetic effect of CHIVA.
In the photos we have patient before and after the elastic band.