Seeing no response in almost a full day I provide the following. This is provided by a "guy" so I do not have any personal experience - still the following may be of some help. I did note your response to an older post on the same subject - perhaps you have gotten what you were looking for there, hope so.
In any case, it is widely agreed that caffeine and other stimuli, including internally generated from depression and or anxiety, can stimulate heart rhythm problems. Thus I would offer my assumption that the menstrual cycle could also cause heart rhythm problems. If these correlate well, usually occur every month, I'd say that is a strong connections.
You may also get more help from the women's health community at:
http://www.medhelp.org/forums/Womens-Health/show/81