What factors affect vascular studies?

Certain factors or conditions may interfere with a vascular study -- a noninvasive (the skin is not pierced) procedure used to assess the blood flow in arteries and veins. These factors include, but are not limited to, the following:
  • smoking for at least an hour before the test, as smoking causes blood vessels to constrict
  • severe obesity
  • cardiac dysrhythmias/arrhythmias (irregular heart rhythms)
  • cardiac disease