Transfus Apher Sci
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To compare the effectiveness, safety and time needed to perform central venous catheterization (CVC) in the presence or absence of an ultrasound (US) guide. ⋯ US-guided CVC affords an easier, safer and more rapid cannulation of a central vein. It is especially helpful in those patients with anatomical variation or difficult veins (small or not visible, non-palpable landmarks) and in those with coagulative disorders.