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Introduction: Intraventricular hemorrhage (IVH) may produce obliterative arachnoiditis, which disrupts the flow and absorption of cerebrospinal fluid (CSF), resulting in posthemorrhagic hydrocephalus (PHH). PHH gives a high risk of neurofunctional impairment. Ventricular lavage is the treatment of choice for PHH in neonates with IVH for decades. It is developing with the combination of fibrinolytic therapy, also called drainage, irrigation, and fibrinolytic therapy (DRIFT), and with the use of neuroendoscopic apparatus, also called neuroendoscopic lavage (NEL)., Methods: This review is a meta-analysis using the PRISMA method guideline, including the clinical studies comparing ventricular lavage (VL) with standard treatment of PHH between 2000 and 2021., Results: VL group reduced the shunt dependency compared to standard treatment (OR = 0.22; 95CI 0.05 to 0.97; p = 0.05). VL group has less infection risk compared to the standard treatment group (RR = 0.20; 95CI 0.07 to 0.59; p < 0.05). The severe neurofunctional outcome is similar between the two groups (OR = 0.99; 95CI 0.13 to 7.23; p = 0.99). The early approach treatment group may give better neurofunctional outcomes compared to the late approach (OR = 0.14; 95CI 0.06 to 0.35; p < 0.05)., Conclusion: VL reduce the shunt dependency on the PHH, decreasing the shunt's related infection rate. The early ventricular lavage may give benefit for the neurocognitive outcome., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)