Skin preparation Use of 10 ml of 2% alcoholic Chlorhexidine "drug" for disinfection in place of povidone iodine without scrubing "device" Wait at least 30 secondes for drying Perineural catheterization implementation Ultrasonography use

Skin preparation Use of 10 ml of povidone iodine "drug" for disinfection with scrubing "device" Wait at least 30 seondes for drying Perineural catheterization implementation Ultrasonography use

Skin preparation (disinfection) with 10 ml of 2% alcoholic Chlorhexidine Perineural catheterization implementation Ultrasonography use

Assuming a frequency of the event without treatment 40%, to highlight a sub treatment relative reduction in frequency of 80% it is necessary to include 92 patients (for a 90% power and a alpha risk of 1%). According to the technique of Brun-Buisson, the catheter will be collected in a neutral tube containing 1 ml of sterile saline. In the laboratory, the tube will be vortexed for one minute and then 10μl of the sample will be seeded in oese calibrated on blood agar. Reading culture will be achieved after 48 hours at 35 ° C aerobically. The catheter will be considered settled if the count found most 1000 UFC / ml. Bacterial identification will be carried out by mass spectrometry and sensitivity by the diffusion method on Muller-Hinton agar. If there is more than one bacterial population, the number of PDUs for each bacterium was determined. In this case, we will consider only the bacterial types> 1000 UFC / ml

Clinical criteria of infection, redness of the puncture area or catheter insertion, hyperleukocytosis, CRP high level, fever, positive blood culture associated with positive catheter colonization, bacterial count > 1000 UFC/ml