| atrial natriuretic peptide |
(ANP) a hormone involved in natriuresis and the regulation of renal and cardiovascular homeostasis. It is generally 28 amino acids in length but varies somewhat; it is synthesized as a prohormone in the granules of the myocytes of the atrium and is released into the circulation in response to atrial dilatation or increased intravascular fluid volume. ...
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| atrial pacing |
regulation of the rate of the heartbeat by means of an intracardiac electrode inserted in the atrium or by temporary placement of an esophageal electrode.
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| atrial reentry |
reentry in which the entire reentrant circuit lies within one or both atria, excluding the sinus node.
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| atrial ring |
the ring surrounding the opening between the atrium and ventricle of the primitive vertebrate heart; represented in the mammalian heart by the atrioventricular node.
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| atrial septectomy |
surgical creation of a defect in the interatrial septum; performed to allow interatrial blood mixing in transposition of great vessels.
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