Could a simple arm catheter replace risky neck lines for hard-stick patients?

This pilot study compares two types of catheters for patients whose veins are difficult to access: a standard central line (inserted into a large vein in the neck, chest, or groin) and a midline catheter (inserted into a vein in the upper arm). The goal is to see if it is practical to run a larger study on this question. Thirty adults with difficult IV access will be randomly assigned to one of the two devices, and researchers will track how well the study procedures work, including recruitment, adherence, and data collection.