qRT-PCR was used to detect the expression of HOTAIR in right atrial appendage tissues of 16 patients with CHDs and 14 patients with rheumatic valvular heart diseases (RVHDs), as well as in plasma of 36 normal people and 90 patients with CHDs including 36 cases of ASD, 23 cases of VSD, and 31 cases of PDA. The gene discussed is HOTAIR; the disease is Patent ductus arteriosus.