Assessment of intra-aortic balloon pumping by ocular pneumoplethysmography.

The ocular pneumoplethysmograph (OPG-Gee) has been used to screen for unsuspected carotid disease in candidates for cardiac operations. This article demonstrates that the validity of such screening is maintained, even if the patient is sustained by an intra-aortic balloon pump (IABP). An unexpected observation is the apparent reduction of ocular blood flow during IABP, which was reduced in this series of 56 patients by an average of 11.6 per cent.