The Efficacy and Safety of Local Anesthetic Infusion With Ropivacaine

Inclusion Criteria: * Diagnosis of UPJ stenosis requiring surgical repair * Ages 3 months to 14 years old * Guardians give consent and the child gives assent when appropriate * Both genders * All racial and ethnic groups Exclusion Criteria: * A history of chronic pain and/or use of chronic opioids and other analgesic(s) * If parents/patients or attending urologist request epidural analgesia or refuse to participate in the study * Impairment of cognition/neurologic, hepatic, renal, cardiovascular, endocrine, metabolic, and/or coagulation function * A history of any diagnosis of psychiatric disorders, including bipolar disorders by self-report or by guardian * A recent history of illicit chemical abuse within one week prior to surgical date * Participants known to be taking prescribed medications or over-the-counter medications known to affect pain perception such as central nervous system stimulants, hypnotics, sedatives, etc within 24 hours of planned surgical procedure