Based on the information available for PH, the authors screened 49 Chinese CTEPH patients and 17 control patients with prior PE but without signs of PH, for mutations in seven genes (BMPR2, ACVRL1, ENG, SMAD9, CAV1, KCNK3, and CBLN2). This evidence concerns the gene KCNK3 and chronic thromboembolic pulmonary hypertension.