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Background:  It is generally believed that certain patient characteristics (e.g., Body Mass Index and age) predict difficulty of intravenous cannulation in children, but there is not much literature evaluating these risk factors. In this study, we investigated predictive factors for success rate at first attempt and time needed for intravenous cannulation.

Methods/Materials:  In a prospective cohort study, we observed characteristics of intravenous cannulations in pediatric patients at the operating room (n = 1083) and the outpatient care unit (n = 178) of a tertiary referral pediatric hospital. Time to successful intravenous cannulation, success at first attempt, and potential predictors for difficult cannulation (age, gender, skin color, BMI or weight‐to‐age z‐score, the child being awake or anesthetized, operator profession and surgical specialty) were recorded. Regression models were constructed to find significant predictors …