atrial

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atrial

 [a´tre-al]
pertaining to an atrium.
atrial natriuretic factor (ANF) a hormone produced in the cardiac atrium; it inhibits renin secretion and thus the production of angiotensin, and stimulates aldosterone release. Its effect is increased excretion of water and sodium and a lowering of blood pressure, which reduces the workload of the heart.
atrial septal defect a congenital heart defect in which the ostium primum or ostium secundum, openings in the septum primum of the embryonic heart, fail to close completely after birth. When an opening remains between the atria, some of the oxygen-rich blood from the left atrium passes into the right atrium and travels back to the lungs without being first transported through the body.
 Atrial septal defect. The shunt is from left atrium to right atrium. From Betz et al., 1994.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

a·tri·al

(ā'trē-ăl),
Relating to an atrium.
Farlex Partner Medical Dictionary © Farlex 2012

atrial

(ā′trē-əl)
adj.
1. Of or relating to an architectural atrium.
2. Of or relating to an anatomical atrium.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

atrial

adjective Relating to an atrium, usually understood as the atrium of the heart.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

atrial

adjective Relating to an atrium, see there, usually understood to be the atrium of the heart.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

a·tri·al

(ā'trē-ăl)
Relating to an atrium.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Atrial

Having to do with the upper chambers of the heart.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.