Chapter

What Goes Around Comes Around—Venous Return

James R. Munis

in Just Enough Physiology

Published on behalf of © Mayo Foundation for Medical Education and Research

Published in print December 2011 | ISBN: 9780199797790
Published online June 2012 | e-ISBN: 9780199929665 | DOI: http://dx.doi.org/10.1093/med/9780199797790.003.0006

Series: Mayo Clinic Scientific Press

What Goes Around Comes Around—Venous Return

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By its nature, circulatory physiology is also susceptible to circular reasoning because every part of an interconnected system is affected by, and affects, every other part. If we're not careful, we end up saying things like ‘venous return equals cardiac output’ when, in the steady state, that is true by definition and nothing new is gained. If we grant that right atrial pressure (PRA) is the ‘downstream’ pressure for venous return, then it follows that PRA should be inversely related to venous return (and therefore, to cardiac output). If we simply apply Ohm's law to the cardiovascular system, we forget that the mean arterial pressure not only contributes to venous return but also is sustained by venous return. If venous return fails for any other reason (unrelated to arterial pressure), so too will mean arterial pressure eventually fail.

Chapter.  1387 words.  Illustrated.

Subjects: Professional Development in Medicine

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