Fig 1.From: The effect of opioid-sparing anesthesia regimen on short-term cognitive function after thoracoscopic surgery: a prospective cohort studyUltrasound guided erector spinae plane block. A The block needle was advanced from a caudal to cranial direction. B Ultrasonographic image of the T4 transverse process in the middle of the image. C The block needle was advanced in-plane until the needle tip contacted the T4 transverse process (TP). D Spread of local anesthetic was observed in the plane between the erector spinae muscle and the transverse process, and erector spinae muscle lifted during the block. T4TP, transverse processBack to article page