• Acta Physiol. Scand. · Jun 1987

    Review Historical Article

    Seventy years of the Bainbridge reflex.

    • M O Hakumäki.
    • Acta Physiol. Scand. 1987 Jun 1;130(2):177-85.

    AbstractThe discovery of the Bainbridge reflex 70 years ago, of a tachycardic response to a rise in central venous pressure, stimulated a lot of interest in this and other cardiovascular reflexes. The mechanoreceptors that elicit the reflex are located at the junction of the right atrium and caval veins or at the junctions of the pulmonary veins and the left atrium. The Bainbridge reflex is controversial, however, because its existence cannot always be demonstrated. Intravenous infusions, which usually elicit a reflex tachycardia, sometimes cause a bradycardic response. This paper reviews the history of the studies associated with the reflex. Results are reported, which demonstrate that the chronotropic response to i.v. infusions depends upon the resulting change in aortic diameter; bradycardia is evoked by infusions leading to a rise in aortic baroreceptor activity through increases in aortic diameter, volume or pressure; tachycardia follows whenever the infusion fails to trigger the baroreflex. The importance of the Bainbridge reflex as a counterbalance to the baroreceptor reflex is discussed.

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