The goal of this clinical trial study is to compare the effectiveness between split septum and mechanical valve needleless connector in very preterm babies (or under 1500 grams) The main questions it aims to answer are: * What is the incidence of Central Line-Associated Bloodstream Infections when using a split septum connector? * What is the incidence of Central Line-Associated Bloodstream Infections when using a mechanical valve connector? * What is the ratio length of stay between babies with birth weight \< 1500 grams who use split septum connector and mechanical valve? * What is the ratio incidence of mortality due to sepsis of babies with birth weight \< 1500 grams who use split septum connector and mechanical valve? Participants will be observed for two weeks after insertion of central line. They will be taken blood sample for culture and sepsis marker panel. Researchers will compare split septum group and mechanical valve group to see if there is a central line associated bloodstream infections
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Incidence of Central Line Associated Bloodstream Infection (CLABSI)
Timeframe: From the date of central line insertion until the date of documented infection, whichever came first, assessed up to 30 days