This study aims to develop an arterial pressure monitoring set fixation device and evaluate its effectiveness in clinical settings. The device is designed to increase the stability and comfort of arterial pressure monitoring during patient care. An experimental study will be conducted with patients requiring arterial pressure monitoring. The device's effectiveness will be evaluated by measuring fixation stability and postoperative arterial blood pressure-CVP parameters over 48 hours. The study aims to demonstrate that the new fixation device can improve patient safety and monitoring accuracy compared to the standard method using adhesive tape, thereby contributing to better clinical outcomes.