Anant KhositsethSuthep WanitkunMahidol University2018-06-112018-06-112012-10-22Cardiology Journal. Vol.19, No.5 (2012), 543-546189755932-s2.0-84867518358https://repository.li.mahidol.ac.th/handle/123456789/14586We present the cases of three children with patent ductus arteriosus (PDA), pulmonary arterial hypertension (PAH), and desaturation. One of them had desaturation associated with atrial septal defect (ASD). His ASD, PAH, and desaturation improved after successful device closure of the PDA. The other two had desaturation associated with Down syndrome. One had desaturation only at room air oxygen (21% oxygen) but well saturated with 100% oxygen, subsequently underwent successful device closure of the PDA. The other had experienced desaturation at a younger age but spontaneously recovered when he was older, following attempted device closure of the PDA, with late embolization of the device. © 2012 Via Medica.Mahidol UniversityMedicineArticleSCOPUS10.5603/CJ.2012.0101