Lidocaine Infusion

This study will assess the efficacy, safety and practicality of using midline catheters for repeated intravenous lidocaine infusions in an outpatient pain management setting. Adult patients requiring serial lidocaine infusions for chronic pain will be enrolled and receive treatment through midline catheters over ten sessions. The study will investigate if the midline catheters are a safe and effective option for delivering repeated lidocaine infusions in the outpatient setting, offering a balance between ease of placement, acceptable complication risk and good patients' comfort.

The goal of this study is to find out whether a small amount of lidocaine (a common local anesthetic) can reduce pain during office hysteroscopy - a procedure used to look inside the uterus. The study will compare lidocaine to saline (salt water) to see which one helps more with pain relief. Participants will: 1. Receive either lidocaine or saline gently applied inside the cervix right before the procedure 2. Undergo the hysteroscopy as planned 3. Be asked to rate their pain and satisfaction after the procedure Lidocaine is commonly and safely used in dental and gynecological procedures. Participation is voluntary, and the procedure itself will not change.

The aim of this study is to assess the effect of oral melatonin versus intraoperative lidocaine infusion on incidence of postoperative delirium in elderly patients undergoing total hip arthroplasty under spinal anesthesia.