Ultrasound-Guided Long Peripheral Intravenous Catheters Versus Conventional Short Peripheral Catheters for Reducing Post-Insertion Failure in Neonates With Congenital Syphilis Receiving Antibiotic Therapy: A Randomized Clinical Trial

Congenital syphilis remains a significant public health problem and requires prolonged intravenous antibiotic therapy, typically with crystalline penicillin. In this context, reliable peripheral venous access is essential to ensure treatment continuity and safety. However, vascular access in newborns is particularly challenging due to small vessel caliber, tissue fragility, and increased susceptibility to complications, often resulting in high rates of catheter failure and repeated insertion attempts.

Short peripheral intravenous catheters inserted using conventional techniques are the most commonly used devices in neonatal care. Despite their widespread use, these devices are associated with limited dwell time and a higher likelihood of failure. Current guidelines recommend the use of adjunct technologies, such as ultrasound guidance, as well as devices with longer dwell times to improve vascular access outcomes. Ultrasound-guided insertion allows better visualization of vessels, potentially increasing first-attempt success and reducing complications. In addition, long peripheral intravenous catheters may provide greater stability and prolonged functional use compared with short catheters.

This study is a randomized, controlled, parallel, prospective clinical trial designed to compare ultrasound-guided long peripheral intravenous catheters inserted by a specialized vascular access team with conventional short peripheral catheters inserted by neonatal nurses. The study will be conducted in the Neonatal Intermediate Care Unit of the Hospital de Clínicas de Porto Alegre, Brazil, between May 2026 and March 2028.

Eligible participants are newborns diagnosed with congenital syphilis who require intravenous antibiotic therapy with crystalline penicillin for a planned duration of ten days. After enrollment, participants will be randomly assigned to either the intervention group (ultrasound-guided long peripheral intravenous catheter) or the control group (short peripheral catheter inserted using conventional technique).

The primary outcome is functional catheter dwell time, defined as the duration from catheter insertion to removal due to completion of therapy or occurrence of failure. Secondary outcomes include catheter failure, number of insertion attempts, first-attempt success, incidence of complications (such as infiltration, extravasation, obstruction, and phlebitis), and total number of devices required during treatment.