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Doppler studies are performed in the sitting position, then the patient is positioned supine and the measurements are repeated after 5 min. The Lindegaard ratio (LR) is obtained in each position, and a variation value is calculated by subtracting the supine from the sitting values (ΔLR = LR sitting – LR supine). The ΔLR is greater in the defective side of patients who had neurological improvement. After the surgery, the variation is negligible on both sides.
