You searched for: “atrial
atrial (adjective)
1. Relating to or belonging to the central area in a building that is open to the sky.
2. The chamber that is connected to other chambers or passageways; especially, one of the two upper chambers of the heart.
This entry is located in the following units: -al; -ial, -eal (page 10) atrio-, atri- + (page 1)
Word Entries containing the term: “atrial
atrial electrogram, high right atrial electrogram (s) (noun); atrial electrograms, high right atrial electrograms (pl)
An intracardiac electrogram which records electrical potentials within the upper region of the right upper chamber of the heart that receives blood from the veins and forces it into the lower part of the heart that moves blood to the rest of the body, obtained by the introduction of electrodes high in the upper part of the heart near the sinus node or the small mass of specialized cardiac muscle fibers located in the back wall of the right upper space of the heart: The atrial electrogram is used in localizing conduction blocks or delays in the normal flow of electrical impulses which cause the heart to beat and diagnosing arrhythmias or abnormal rates or rhythms, of the heart.

atrial fibrillation (s), atrial fibrillations (pl) (nouns)
Extremely rapid, incomplete contractions of the atria (chamber of the heart that receives blood from the body and transmits it to the ventricles) resulting in irregular intensities and rhythms and uncoordinated movements of the heart.