Endoscopic lavage after intraventricular haemorrhage in neonates in the UK (ENLIVEN-UK): study protocol for a national randomised-controlled trial

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BACKGROUND: Intraventricular haemorrhage (IVH) is a common and severe complication of preterm birth, affecting nearly 500 neonates annually in the UK. Over 50% of infants with IVH develop post-haemorrhagic ventricular dilatation (PHVD), which is associated with significant long-term neurodevelopmental impairment. Current treatment strategies involve the use of temporary CSF diversion, through options such as ventricular access devices (VADs) or ventricular subgaleal shunts (VSGS). Neuroendoscopic lavage (NEL) is an emerging technique that aims to directly reduce the load of intraventricular blood and its breakdown products, potentially reducing the risk of secondary brain injury. The ENLIVEN-UK trial aims to assess whether the addition of NEL to standard temporising device placement improves neurodevelopmental outcomes at 2 years of corrected age compared to temporising device placement alone. METHODS: ENLIVEN-UK is a national, multicentre, parallel-group, assessor-blinded, superiority randomised controlled trial (RCT) that aims to enrol 100 preterm infants with severe IVH and PHVD across UK paediatric neurosurgical centres. Infants will be randomised in a 1:1 ratio to receive either standard temporising device placement or NEL in addition to temporising device placement. Randomisation will be performed using a secure online system (Sealed Envelope), with outcome assessors and statisticians blinded to treatment allocation. The primary outcome measure will be cognitive quotient (CQ) at 2 years of corrected age, assessed using the Bayley Scales of Infant and Toddler Development (4th edition, Bayley-IV). Secondary outcomes will include motor and language development, the requirement for permanent CSF diversion with a ventriculoperitoneal (VP) shunt, surgical complications, health-related quality of life (EQ-5D-5L, TAPQOL), and healthcare costs. DISCUSSION: This study aims to provide level 1 evidence regarding the efficacy and safety of NEL in preterm infants with IVH and PHVD. If successful, this trial has the potential to change the standard of care and improve long-term neurodevelopmental outcomes in this cohort of patients. TRIAL REGISTRATION: ISRCTN Trial Registration: ISRCTN14018410.

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