Inclusion Criteria:  Females, 18 years and older American Society of Anesthesiologists physical status I or II Status post natural labor/birth process or C-section Has epidural or CSE catheter Upcoming procedure requiring epidural/CSE anesthesia for pain management  Exclusion Criteria:  Contraindication to regional anesthesia Allergy or hypersensitivity to lidocaine, bupivacaine, or fentanyl Use of sedatives or opioids Abnormal vertebrae anatomy Neurological disorder with lumbar involvement Implanted electronic devices Did not receive epidural or CSE anesthesia