Factors that affect longevity of intravenous cannulas : a prospective study

(95% CI 49–72), 43 h (95% CI 36–48.5) and 29 h (95% CI 24–40.5), respectively. The site of IC placement influenced the longevity of ICs (P = 0.005, RR= 0.7, 95% CI 0.55–0.9), as did male gender (P = 0.03, RR = 0.76, 95% CI 0.6–0.97). However in subgroup analysis, the most marked effect on IC longevity was evident in those patients with 18 g placed in the forearm/wrist (median 72 h) with less marked changes in other site/gauge combinations. In contrast, 22 g ICs placed in the hand had a median lifespan of 29 h. Conclusion: IC gauge and site of placement are important factors in determining IC longevity. 18 g ICs placed in the forearm/wrist can considerably increase the longevity of ICs and should be attempted in patients who require sustained cannulation.