- Congenital atrial standstill associated with coinheritance of a novel SCN5A mutation and connexin 40 polymorphisms. Makita, N., Sasaki, K., Groenewegen, W.A., Yokota, T., Yokoshiki, H., Murakami, T., Tsutsui, H. Heart rhythm : the official journal of the Heart Rhythm Society. (2005)