RESULTS: The average time to vessel cannulation in the trainees was 15 seconds. Out of 60 attempts, 8 learners made attempts that resulted in excess needle depth (13%). Use of a needle guide was associated with a time to cannulation of 14.0s, transverse probe position 16.1s and longitudinal position 16.5s. Longitudinal probe position resulted in 2 placements with excessive depth, transverse position with 2 placements of excessive depth and the needle guide assisted placement with 4. None of these differences were statistically significant. Trainee inexperience (<5 CVCs placed) was associated with a significantly longer time to successfully cannulate the vessel (12.1s vs 23.5s, p<0.01), but not a significantly higher rate of needle misplacement (17% vs 12%).