Percutaneous nephrolithotomy (PCNL) is one of the commonly done surgery for treating kidney stones. But the post operative pain is intense that it requires lot of analgesics. Especially in a patient with kidney disease these drugs should be used with caution. Hence nerve blocks were tried which provides commendable analgesia and thereby reducing analgesics consumption. Erector Spinae Plane Block and Quadratus Lumborum Block are two techniques that provide excellent post operative analgesia for PCNL surgeries. Though they were individually studied and proved efficacy, they are not compared and studied adequately. So we designed this study to compare the safety and efficacy of these two techniques. Bupivacaine which is a long acting amide local anaesthetic will be used for giving blocks. We will be administering 0.25% BUPIVACAINE 20 ml in both of the techniques. The study population will be selected according to the inclusion and exclusion criteria. Those who fulfils the criteria will be eligible to participate in the study. The patient and attenders will be explained about the procedure and how to give response during the study. After obtaining consent participants will be recruited to study.

As per the plan of study,An experienced anaesthesiologist will be administering the block at the end of PCNL surgery,and he/she will be monitored for the next 24 hours for the duration of analgesia and also will be monitored for the complications. As the procedure is done under USG guidance,occurrence of complications is extremely minimal,however we will be prepared for the same. At the end of the study we hope we will be able to come to a conclusion whether ESPB or QLB provide better analgesia with fewer side effects and hence can be used for the improved patient care .