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Within recent years, methods have been developed for direct observational studies concerned with functional aspects of the muscular vessels in the capillary bed of living small mammals of several species (1-3). With these technics, it has been found that certain objective criteria of peripheiral vascular reactivity can be selected and followed during repeated examinations of the terminal vessels with the microscope.Comparisons of the several different overall hemodynamic disturbances in the experimental animal (i.e., hypertension, acute hemorrhage, prolonged hypotension) with their co-existent phenomena in the peripheral vascular system have shown that each separate condition thus far investigated has had a distinctive status reflected in the capillary bed of the mesentery. For example, acute hemorrhage was accompanied by widespread arteriolar and metarteriolar constriction, capillary ischemia, and poor venular return. The reactivity of metarterioles and precapillary sphincters to topically applied epinephrine was augmented. Terminal prolonged hemorrhagic or traumatic hypotension, on the other hand, had a dilated capillary bed, with sluggish arteriolar and venular blood flow, plethoric capillaries and diminished epinephrine responses (2, 4, 5). The mesenteric vascular bed in experimental renal hypertension was predominantly constricted, with ischemic arterioles and capillaries and a similar elevation of epinephrine response. In addition, it had a marked "hyperplasia" of vascular elements (6).

PERIPHERAL VASCULAR HEMODYNAMICS IN THE BULBAR CONJUNCTIVA OF SUBJECTS WITH HYPERTENSIVE VASCULAR DISEASE 123