摘要Background Very few adequately powered studies exploring early thresholds for intervention in the management of post-hemorrhagic ventricular dilatation(PHVD)in preterm infants have identified consistent neurodevelopmental advantages at 12-30 months.We aimed to conduct a meta-analysis on the efficacy and safety of early versus conservative thresholds for intervention,primarily aimed at normalizing cerebrospinal fluid(CSF)pressure,in the management of PHVD in preterm infants.Methods Multiple databases were searched for eligible papers,and prospective randomized trials involving preterm infants were selected.The results are expressed as relative risks(RRs)with 95％confidence intervals(Cis).The main outcome was survival without moderate-to-severe neurodevelopmental impairment at 12-30 months.Results Ten articles representing seven randomized trials comparing early versus conservative thresholds for interventions were included.Five trials(n=545 infants)reported no difference in the main outcome between early and conservative groups[RR 0.99(0.71,1.37)].Sensitivity analysis excluding data from a medication trial did not alter the main outcome[RR 1.15(0.95,1.39)].Infants in the early threshold group received significantly more interventions[RR 1.48(1.05,2.09)].Deaths before discharge/during the initial study period[RR 1.04(0.70,1.54)]or a composite of death or shunt insertion[RR 1.04(0.86,1.27)]were comparable between the two groups.Conclusions Early intervention for PHVD,before a clinical or ultrasound threshold is met,leads to additional clinical pro-cedures but does not improve survival without moderate-severe neurodevelopmental impairment at 12-30 months.Caution should be exercised in interpreting these results due to significant variation between the studies.