atrial complex n.
The P wave in an electrocardiogram.
- Atrial conduction
atrial conduction atrial conduction n. See intra-atrial conduction.
- Atrial dissociation
atrial dissociation atrial dissociation n. Independent beating of the two atria or of parts of the atria.
- Atrial extrasystole
atrial extrasystole atrial extrasystole n. A premature contraction of the heart arising from an ectopic atrial focus.
- Atrial fibrillation
atrial fibrillation atrial fibrillation n. Fibrillation in which the normal rhythmical contractions of the cardiac atria are replaced by rapid irregular twitchings of the muscular wall that cause the ventricles to respond irregularly. Also called auricular fibrillation.