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The purpose of this study was to investigate the possible participation of atrial natriuretic factor (ANF) in the natriuretic and diuretic response occurring after stimulation of the peripheral arterial chemoreceptors by almitrine bismesylate in normoxic humans. The experiments were performed in 14 healthy male volunteers undergoing water diuresis. Each subject participated in two experiments. In one of them they ingested 100-mg almitrine at 12 p.m. The other study served as a control. Surprisingly, our subjects responded to almitrine with an elevation of urine flow only, whereas sodium excretion remained almost unchanged over the whole period of the experiments. As regards ANF plasma concentrations, no statistically significant differences between the control and the almitrine group could be observed. Moreover, no direct connection between ANF plasma concentrations and renal volume excretion was detectable. We conclude that a specific stimulation of peripheral arterial chemoreceptors by almitrine in humans undergoing water diuresis did not seem to raise ANF plasma concentrations as is the case at high altitude. Therefore we would suggest that there exists no specific reflex influence of these receptors on ANF release.  相似文献
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