A cryptic pregnancy is one in which one does not know that they are pregnant until they are in labour. If the pregnancy is very smooth-going and no problems encountered, then there would not be any reason to experience bleeding during this time until the onset of spontaneous labour in which case the "show" (dislodging of the mucus plug from the cervical opening) would occur. If, however, there was an instance of threatened miscarriage, then there would be unexpected per vaginal bleeding and this may or may not be accompanied with pelvic pain.

Essentially the criteria we look out for are Parkinson's patients we feel will greatly benefit from this. We are looking for patients who maybe have mobile fluctuations, meaning they have this “on-off” phenomenon. We want to make sure we do not treat patients with dementia because they do not respond as well to DBS and we want to exclude patients who have severe depression. Again, patients with depression should not have surgery until their depression is stable. So we eliminate those patients who aren't suitable.