Saroa R, et al. - In patients scheduled to undergo percutaneous nephrolithotomy (PCNL), researchers compared the analgesic efficacy of levobupivacaine (LB) vs ropivacaine (RB) when given in an ultrasound-guided paravertebral block (PVB). Participants were 30 patients aged between 18 and 65 years of either sex with American Society of Anesthesiologist status I/II and a body mass index 18.5-25, scheduled to undergo PCNL. A single shot of 20 ml of either ropivacaine (0.2%) or levobupivacaine (0.2%) in ultrasound-guided PVB using an in-plane technique was administered randomly to the patients. According to findings, adequate and effective analgesia in the postoperative period was achieved with the administration of either local anesthetic as a single-shot ultrasound-guided ipsilateral PVB at the end of the surgical procedure. The benefits of ultrasound included real-time imaging of the anatomical structures and prevention of potential complications of the block.