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Opacity Pulse Recordings from the Microcirculatory Bed of the Conjunctiva

Previous studies from this laboratory on changes in the opacity of the cerebral cortex and of the ipsilateral ear in experimental animals during each cardiovascular cycle have shown that pulsatile waves simultaneously derived from these tissues vary in their contour, amplitude, base line activity and phase.’-3 Aberrations in cardiac rate are clearly reflected in opacity pulse recordings, but the changes may differ greatly in degree in different tissues. Amplitude and base line activity vary during respiration partially in concert vi th changes in arterial pulse pressure and central venous pressure, but spontaneous changes are also observed which do not correlate with detectable changes in systemic parameters. I n these studies, however, the size and configuration of blood vessels in the tissues monitored could not be adequately evaluated until after the animal had been sacrificed. The influence of variable vascular morphology and of vasomotor activity during life on the characteristics and behavior of the opacity pulse \vave4f could therefore only be surmised. For this reason, characteristics of the opacity pulse wave were investigated in the microcirculatory bed of the conjunctiva where vessels are readily accessible to observation by standard biomicroscopic techniques. Behavior of the opacity pulse wave was correlated not only with the directly observed behavior of small conjunctival blood vessels but also with simultaneous observations of other systemic cardiovascular parameters. The purpose of the communication is to describe the opacity pulse wave occurring normally in the conjunctiva of anesthetized dogs.