Does bedside dynamic ultrasonography increase successful peripheral intravenous access rates?

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Why is this study important?

Intravenous (IV) placement in children often can be technically difficult, especially in those who are younger. A clinical scoring system to predict failure of IV placement has been developed and validated because, in those children with predictably difficult IV access, additional methods are needed to minimize the number of unsuccessful attempts.[1] This trial hypothesizes that bedside, dynamic ultrasonography (US) significantly increases successful peripheral first-attempt IV access rates.

Which, if any, threats to validity are most likely to have an impact on the results and how?

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