Bonnie,

In our vascular lab, we also perform venous reflux studies with our patient's
standing, using segmental cuffs for venous augmentation and occlusion.  You
described perfectly what we have seen in our lab as well.  I would estimate
that 1/2 of our patient's at some time during the exam, will feel light
headed to the point that they must lay down.  Once the test is resumed, the
symptoms return.  I have found it to be so common that I inform my patients
not to hesitate telling me if they feel lightheaded during the examination.
 I have not noticed any striking trends between the sexes or age groups.  It
has happened to many of our patients - from little old ladies to young men.

Anybody have any theories?

Bryan Petrisko, RVT
Lahey - Hitchcock Medical Center
Burlington, MA