Of or pertaining to an atrium.
fibrillation: A condition in which the upper chamber of the heart (atria) are not contracting normally and causing irregular heart rhythm.
of or relating to a cavity or chamber in the body (especially one of the upper chambers of the heart)
Of the atrium
Relating to the right atrium of the heart.
Pertaining to the atria, the upper chambers of the heart, as in atrial fibrillation and atrial septal defect.
Referring to the two thin walled cavities of the heart.