Akbarzadeh, M. A., Safi, M., Khaheshi, I., & Bahrololoumi Bafruee, N. (2016). Syncope during pregnancy in a patient with permanent cardiac pacemaker, due to increased pacing threshold. International Journal of Cardiovascular Practice, 1(2), 45–46. https://doi.org/10.21859/ijcp-010207