| SV | saphenous vein; sarcoma virus; satellite virus; selective vagotomy; semilunar valve; seminal vesicle... |
|---|---|
| AF | abnormal frequency; acid-fast; adult female; afebrile; aflatoxin; albumin-free; albumose-free; aldeh... |
| AFF | atrial fibrillation; atrial filling fraction; atrial flutter |
| ALS | acute lateral sclerosis; advanced life support; afferent loop syndrome; amyotrophic lateral sclerosi... |
| LGN | lateral geniculate nucleus; lateral glomerulonephritis |
| atrial bigeminy | Pairing of atrial beats, as when an atrial extrasystole is coupled to each sinus beat. (05 Mar 2000) |
|---|---|
| atrial branches | The atrial branches, the branches of the right coronary artery and the circumflex branch of the left coronary artery distributed to the right and left atrium, respectively. Synonym: rami atriales. (05 Mar 2000) |
| atrial capture beat | The cardiac cycle resulting when, after a period of A-V dissociation, the atria regain control of the ventricles; atrial depolarisation due to retrograde transmission from a ventricular ectopic beat or an electronically paced ventricular impulse. (05 Mar 2000) |
| atrial chaotic tachycardia | Multifocal origin of tachycardia within the atrium; often confused with atrial fibrillation during physical examination. (05 Mar 2000) |
| atrial complex | P wave in the electrocardiogram. Synonym: auricular complex. (05 Mar 2000) |
| atrial diastole | Period of relaxation and repolarization of the atrial muscle. (05 Mar 2000) |
| atrial dipeptidyl carboxyhydrolase | <enzyme> Removes c-terminal phe-arg from atriopeptin II to give atriopeptin i; metalloenzyme with mw 240,000; also has tripeptidyl carboxyhydrolase activity; removes phe-arg-tyr from atriopeptin III to form atriopeptin i Registry number: EC 3.4.15.- (26 Jun 1999) |
| atrial dissociation | Mutually independent beating of the two atria or of parts of the atria. (05 Mar 2000) |
| atrial echo | Electrical reactivation of the atrium by a retrograde impulse returning from the A-V node while the antegrade impulse continues to the ventricle; characterised electrocardiographically, by a pair of P waves enclosing a QRS complex, the second P wave being inverted, indicating that it is the reverse (the retrograde pathway) of the pathway of the first P wave (the antegrade pathway). (05 Mar 2000) |
| atrial extrasystole | A premature contraction of the heart arising from an ectopic atrial focus. Synonym: auricular extrasystole. (05 Mar 2000) |
| atrial fibrillation | <cardiology> A condition where there is disorganised electrical conduction in the atria, resulting in ineffective pumping of blood into the ventricle. Acronym: AF (02 Jan 1998) |
| atrial flutter | <cardiology> A rapid well organised contraction of the atrium at a rate of 250-350 contractions per minute. Ventricular response rates are usually some multiple of 300. ECG shows sawtooth waves. Atrial flutter is considered a serious and potentially unstable rhythm. (27 Sep 1997) |
| atrial function | The haemodynamic and electrophysiological action of the atria. (12 Dec 1998) |
| atrial function, left | The haemodynamic and electrophysiological action of the left atrium. (12 Dec 1998) |
| atrial function, right | The haemodynamic and electrophysiological action of the right atrium. (12 Dec 1998) |