竇房結(英文:Sinus node, sinoatrial node, 或 SA node)是心臟中位於右心房上壁的一個組織部位,又稱為節律點。竇房結是正常心跳的產生部位,由其產生的心跳速率約為每分鐘72次。當竇房結病變時可能會引發心跳過速、心跳過緩等心臟病,也可能由心臟的其他部位如心房、心室、浦氏纖維接管起搏功能,它們的搏動速率均要低於竇房結。[1]成年人竇房結的大小約為長15毫米,寬5毫米,厚2毫米。竇房結內部由起搏細胞(P細胞)和過渡細胞兩種細胞組成,前者舒張快組成數個集群,後者則包圍着這些集群負責傳導。[2]
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