Akbarzadeh, M.A., Safi, M., Khaheshi, I. and 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 (Aug. 2016), 45–46. DOI:https://doi.org/10.21859/ijcp-010207.