Demonstrates a reflex mechanism of venous dilation in response to venous congestion mediated by vagal afferents and sympathetic inhibition.
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Does not support clinical changes in congestion management; leaves open human relevance of this reflex.
Changes in venous tone produced by partial occlusion of the thoracic inferior vena cava, or of the mitral orifice, have been studied in acute experiments on anesthetized dogs, employing distensibility diagrams obtained from injections into the veins of a loop of intestine to measure venous tone. The results demonstrate a reflex mechanism producing venous dilation in response to venous congestion which is mediated by vagal afferents and inhibition of sympathetic efferents.
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Robert Alexander (1956) studied this question.
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