Characteristics of Peripheral Intravenous Catheter Cannulation in Older Japanese Inpatients

Age-related physiological changes affect various aspects of peripheral intravenous catheter (PIVC) cannulation. However, the characteristics of PIVCs, especially in older patients, have been poorly investigated. In the current cross-sectional observational study, PIVC sizes, PIVC sites, the number of attempts until successful insertion, and the degree of venodilation upon insertion among hospital inpatients aged ≥65 years were investigated, along with measurements of the vessel diameter and depth using ultrasound. In total, 91 PIVC insertions were analyzed. The vessel diameter was estimated to be smaller than that in domestic adult inpatients. Most of the catheters were placed at the ideal site on the first attempt. However, considering the optimal vein-to-catheter ratio, most of the cannulations were oversized and would be oversized even when using a 24-gauge catheter. In addition, obvious differences were found in the vessel diameter, catheter size, and catheter site compared with previous studies conducted outside of Asia. The current study indicates the need for further research on the identification of appropriate veins, and the definition of "appropriate"approaches might vary among countries.