Comparison of Ultrasound-Guided Versus Palpatory Method of Posterior Tibial Artery Cannulation: A Prospective Randomized Controlled Study

Introduction: Superficial arteries, such as radial and dorsalis pedis arteries, are commonly cannulated for invasive blood pressure monitoring. Failure to cannulate these arteries necessitates alternate arteries, such as the posterior tibial artery (PTA). The deep-seated anatomy of PTA makes arterial cannulation precarious by the palpatory technique. Ultrasound guidance during PTA cannulation may overcome this problem. With this background, we evaluated the ultrasound -guided (USG) versus palpatory method for PTA cannulation with respect to the first attempt's success and number of attempts. Methods: A total of 240 American Society of Anesthesiology (ASA) physical status I -IV adult patients undergoing major surgeries requiring arterial cannulation were randomly allocated (1:1) to group A (USGguided cannulation, n = 120) and Group B (cannulation by palpatory technique, n =120). PTA was cannulated by either of the techniques according to randomization. Data were analyzed and compared in both groups for first -attempt success, number of attempts, assessment time, cannulation time, and complications. Result: The successful cannulation in the first attempt in Group A was 25.8% (n = 31), and in Group B, it was 12.5% (n = 15) (p = 0.009). In Group A, 78.3% of patients (n = 94) had successful cannulation, and in group B, 65% of patients (n =78) had successful cannulation (p = 0.022). Both groups had similar assessment time (p = 0.348) and cannulation time (p = 0.864). Conclusion: USG -guided PTA cannulation offers a greater chance of success without any added increase in procedure time.