Fig. 3From: Sphenopalatine ganglion block with or without greater occipital nerve block for treatment of obstetric post-dural puncture headache after spinal anesthesia: randomized controlled trialModified Lybecker score at different timings between the three groups. Group C, control group; Group S, bilateral sphenopalatine ganglion block group; Group NAG, combined nerve and ganglion block groupBack to article page