Trial Comparing the Effect of a Paravertebral Block on Pain Post Percutaneous Nephrolithotomy

Inclusion Criteria: * 19 or older, able to give consent * ASA 1, 2 or 3 patients * Patients to undergo PCNL Exclusion Criteria: * Complex stone with anticipation of requiring \>1 access sites * Prior diagnosis of chronic pain requiring daily opioid analgesia for \> 1 month prior to diagnosis of Nephrolithiasis * Allergy to local anesthetic * Local infection at site of regional anesthesia * Back or other MSK deformity that contributes to inaccuracy of paravertebral block placement * Severe cardiopulmonary disease * Fibromyalgia * Anticoagulation * Patient with language barrier or inability to communicate