Regional blood flow measurements with 15 m and 50 m microspheres in pregnant guinea-pigs

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Abstract
Two sizes of microsphere were used to determine regional blood flow in pregnant guinea-pigs. Tissue perfusion measured with 50 .mu.m microspheres was significantly greater than that measured with 15 .mu.m microspheres in the small intestine, uterus, vagina and placenta. A significantly larger proportion of the smaller microspheres passed through the systemic vasculature and could be detected in the lungs.