MALAT1 and hydrops fetalis: In the in vivo experiment, after injecting PKH67-labeled serum-Exos into the lateral ventricle of HF mice for 5 h, RT-qPCR detection results showed that in the choroid plexus epithelium (CPE), CSF, and brain parenchyma in HF mice, MALAT1 and miR-382-3p expression in the Exos group was significantly increased compared with the PBS group, with MALAT1 expression being greater than that of miR-382-3p.