Criteria for interpretation of ocular pneumoplethysmography (Gee)
B. Eikelboom, T. S. Riles, P. Folcarelli and A. M. Imparato
Ocular pneumoplethysmography (OPG) (Gee) is one of the most widely used
tests for evaluation of carotid artery disease. Its usefulness depends on
its diagnostic accuracy, which depends on the criteria used for
interpretation of OPG tracings. Application of different criteria as
suggested in the literature by Gee et al, McDonald et al, Baker et al,
Eikelboom, and O'Hara et al on 200 OPG tests compared with angiography
resulted in variations of sensitivity from 70% to 95%, specificity from 70%
to 94%, and overall accuracy from 75% to 90%. In validating OPG, one has to
be aware of these substantial differences. We found the criteria of
McDonald et al the most suitable for clinical use.
