Presyncope is a poorly studied symptom.
Often practitioners dismiss it or treat it like a full syncopal event, but until recently what the risks are in this population of patients in the ER was not well known.
Do you want to know what the best study to date shows on the topic?
If so read here.
If not you should, because in this well done prospective cohort study from Canada they found that 1/20 ED patients with presyncope experienced either death, cardiovascular event or Arrhythmia by 30 days from their ED visit.