"Intraoperative Use of Distal Radial Artery Cannulation With Snuffbox Approach'

The distal radial artery (dRA) in the snuffbox location is a popular arterial access site for interventional cardiological procedures and neurointerventions. The investigators aimed to investigate the distal radial artery as an alternative site to the classical radial artery (RA) in cases requiring intraoperative arterial cannulation and blood pressure monitoring. The superficial location of the classic radial artery, its collateral blood flow with the ulnar artery, and limited complications make it a preferred choice for catheterization purposes. Given its use in various medical procedures such as flap transplantation, creating arteriovenous fistulas for hemodialysis, and bypass grafting, the investigators believe that preserving the classic radial artery is essential for potential health issues likely to arise in the future. In addition, the investigators aim to minimize circulatory complications by working more distally. Furthermore, it's worth mentioning that alterations in wrist positioning causing disruptions in the invasive arterial waveform also create a need for a different puncture approach. For all these conditions, the investigators believe that the snuffbox approach to distal radial artery cannulation would be an advantageous alternative.

This study will be a prospective randomized, controlled single-blind study. Patients who are scheduled for elective surgery, aged 18 and above, with ASA 1, 2, or 3 classifications, and requiring intraoperative arterial cannulation at Diyarbakır Gazi Yaşargil Training and Research Hospital will be included in the study. The exclusion criteria for participating in the study are as follows: under 18 years of age, ASA-4 classification, presence of non-palpable arteries, presence of burns or infection at the cannulation site, peripheral vascular disease, bleeding or coagulation disorders, negative modified Allen's test, and communication disorders. The withdrawal criteria for the study include a patient's desire to withdraw from the study at any stage and an extended cannulation time.

Participants will be divided into two groups, and ultrasound-guided cannulation will be performed for each group. One group will be cannulated through the classical radial artery of the forearm, while the other group will be cannulated through the distal radial artery using the snuffbox approach. Demographic data (age, gender, weight, height, BMI, comorbidity, medications, ASA, previous artery intervention, working position and working time), USG measurement data (diameter and depth of the artery) and procedural data (hand selection, first attempt success rate, arterial catheterization time, arterial posterior wall puncture rate, intraoperative artery waveform quality, postoperative compression time, and complications) will be recorded.

The sample size was determined by G-Power version 3.1.9.4, taking into account a two-tailed alpha error of 0.05, a power of 0.80, and an effect size of 0.5. Based on this savings and N2/N1 allocations of 0.98 in a previous study ( Distal radial artery as an alternative approach to forearm radial artery for perioperative blood pressure monitoring: a randomized, controlled, noninferiority trial Jingwei Xiong1 , Kangli Hui1 , Miaomiao Xu1 , Jiejie Zhou1 , Jie Zhang1 and Manlin Duan1,2* Xiong et al. BMC Anesthesiology (2022) 22:67 https://doi.org/10.1186/s12871-022-01609-5 ), the minimum number required for the study was planned to be 52 patients in the dRA group and 50 patients in the RA group.

The intervention will be performed under USG guidance by a single anesthesiologist with at least 5 years of experience in arterial cannulation.