Buy this Article for $7.95

Have a coupon or promotional code? Enter it here:

When you buy this you'll get access to the ePub version, a downloadable PDF, and the ability to print the full article.


  1. Tanabe, Hidenori ME
  2. Takahashi, Toshiaki MHS, RN
  3. Murayama, Ryoko PhD, RN, RMW
  4. Yabunaka, Koichi PhD, RT
  5. Oe, Makoto PhD, RN
  6. Matsui, Yuko PhD, RN
  7. Arai, Rika MS
  8. Uchida, Miho MSI, RN
  9. Komiyama, Chieko RN
  10. Sanada, Hiromi PhD, RN, WOCN


Small veins are a risk factor for infiltration. However, there are no data regarding the ideal vein diameter for preventing infiltration. Using ultrasound, vessel diameter and calculated ratios of the vessel diameter to the catheter gauge were measured. The relationship between the ratio and infiltration was assessed to establish a cutoff point. The mean ratio of the infiltration group was significantly smaller than that of the no-infiltration group (P < .01), and the ratio was an independent risk factor according to the multivariable analysis. The ratio of 3.3 was determined to be the cutoff point that enables health care professionals to identify veins appropriately.