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Multiple small studies since 2005 have shown that ultrasound guidance improves success of peripheral intravenous (IV) line placement when access is difficult. These researchers randomized 1189 patients to ultrasound-guided or traditional peripheral IV cannulation performed by emergency department technicians. Patients were stratified into three groups according to anticipated difficulty of access as assessed by technicians before randomization: difficult (could not see or palpate a vein in either arm), moderately difficult (could see or palpate 1 or more veins but thought access would be difficult with the landmark approach), or not difficult (could see or palpate 1 or more veins and thought access with the landmark approach would be easy).…