Levobupivacaine plasma level between erector spinae plane block and thoracic paravertebral block

To the Editor We read with interest the recent article of Taketa et al [1][1] comparing ultrasound-guided erector spinae plane (ESP) block and thoracic paravertebral block for postoperative analgesia after video-assisted thoracic surgery. We have some concerns about levobupivacaine plasma levels in