| atrial synchronous pulse generator | A ventricular stimulating pulse whose rate of discharge is directly determined by the atrial rate. Synonym: atrial triggered pulse generator. (05 Mar 2000) |
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| atrial systole | Contraction of the atria. Synonym: auricular systole. (05 Mar 2000) |
| atrial tachycardia | Paroxysmal tachycardia originating in an ectopic focus in the atrium. Synonym: auricular tachycardia. (05 Mar 2000) |
| atrial transport function | The role of the atria in filling and stretching the ventricles by their presystolic contraction, without which the force of ventricular contraction and hence the cardiac output may significantly decrease. (05 Mar 2000) |
| atrial triggered pulse generator | A ventricular stimulating pulse whose rate of discharge is directly determined by the atrial rate. Synonym: atrial triggered pulse generator. (05 Mar 2000) |
| atrial ventricular canal defect | A defect caused by deficient or absent septal tissue immediately above and below the normal level of the atrioventricular valves, including the region normally occupied by the A-V septum in hearts with two ventricles. The A-V valves are abnormal to a varying degree. (05 Mar 2000) |
| atrial-well technique | An obsolete semi-closed surgical technique for repairing atrial septal defects and other cardiac abnormalities. (05 Mar 2000) |
| atrichia | Absence of hair, congenital or acquired. Synonym: atrichosis. Origin: G. A-priv. + thrix (trich-), hair (05 Mar 2000) |
| atrichosis | Absence of hair, congenital or acquired. Synonym: atrichosis. Origin: G. A-priv. + thrix (trich-), hair (05 Mar 2000) |
| atrichous | Without hair. (05 Mar 2000) |
| atrio- | The atrium; atrial. Origin: L. Atrium, an entrance hall (05 Mar 2000) |
| atrioactivase | <enzyme> Selectively cleaves the arg(98)-ser(99) peptide bond in pro-atrial natriuretic factor during or just after the process of secretion from the heart atrium Registry number: EC 3.4.21.- (26 Jun 1999) |
| atriocarotid interval | An obsolete term for the time between the beginning of the atrial and that of the carotid waves in a tracing of the jugular pulse. (05 Mar 2000) |
| atriomegaly | Enlargement of the atrium. Origin: atrio-+ G. Megas, great (05 Mar 2000) |
| atrionector | Synonym: sinuatrial node. Origin: atrio-+ L. Necto, to join (05 Mar 2000) |