This analysis 1) is in agreement with the widely recognized pathophysiological role of TASK1 and KV1.5, 2) supports previous preliminary reports pointing to the dysregulation of several K+ channels including the downregulation of KV1.1, KV1.4, KV1.6, KV7.1, KV7.4, KV9.3 and TWIK2 and the upregulation of KCa1.1 and 3) points to other cationic channels dysregulated such as Kv7.3, TALK2, CaV1 and TRPV4 which might play a pathophysiological role in PAH. This evidence concerns the gene KCNA4 and pulmonary arterial hypertension.