Comparison of Ultrasound-Guided Posterior Tibial Artery Cannulation in Supine Versus Prone Position in Adult Surgical Patients : A Randomised Controlled Trial

This prospective, randomized controlled trial aims to compare the effectiveness of ultrasound-guided posterior tibial artery (PTA) cannulation performed in the supine versus prone position in adult surgical patients requiring invasive arterial blood pressure monitoring. Eligible patients will be randomly allocated in a 1:1 ratio to either the supine or prone group using computer-generated block randomization with allocation concealment.

The primary outcome is the first-attempt success rate of PTA cannulation. Secondary outcomes include arterial diameter, ultrasound assessment time, cannulation time, total procedure time, number of attempts, complication rates, and operator-reported ease of cannulation. Outcomes will be assessed during and immediately after the procedure by a blinded outcome assessor.

The findings of this study are expected to help identify the optimal patient positioning for ultrasound-guided PTA cannulation, thereby improving procedural efficiency, safety, and clinical practice in perioperative and critical care settings.