| 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) |
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| 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) |
| atrial fusion beat | A beat that occurs when the atria are activated in part by the sinus impulse and in part by an ectopic or retrograde impulse from A-V junction or ventricle. (05 Mar 2000) |
| atrial gallop | Gallop rhythm in which the gallop sound follows atrial systole in late diastole and is an audible fourth heart sound due to forceful ventricular filling. Synonym: atrial gallop. Protodiastolic gallop, gallop rhythm in which the gallop sound occurs in early diastole and is an abnormal third heart sound. (05 Mar 2000) |
| atrial granule serine proteinase | <enzyme> Converts pro-atrial natriuretic factor to anf by cleaving the arg98-ser99 bond; n-terminal 26-residue amino acid sequence given in first source Registry number: EC 3.4.21.- (26 Jun 1999) |
| atrial myxoma | <cardiology, oncology, tumour> A very rare primary cardiac tumour, composed of connective tissue, located in the left or right atrium. Symptoms include chest pains, shortness of breath, orthopnoea, paroxysmal nocturnal dyspnoea, fainting, palpitations, dizziness and syncope. Diagnosis is confirmed by echocardiogram. Treatment involves the surgical excision of the tumour. (27 Sep 1997) |
| atrial natriuretic factor | <chemical> A potent natriuretic and vasodilatory peptide or mixture of different-sized low molecular weight peptides derived from a common precursor and secreted by the heart atria. All these peptides share a sequence of about 20 amino acids. Chemical name: Atriopeptin (12 Dec 1998) |
| atrial natriuretic peptide | <hormone> This cardiac hormone (28 amino acid residues) regulates salt and water balance in body fluids and blood pressure, it has potential as a medication to treat heart and kidney failure and the buildup of excess fluid in tissue. (09 Oct 1997) |
| atrial premature complexes | Premature contractions of the heart arising from an ectopic atrial focus. With ventricular premature complexes, they represent one of the most common causes of irregular pulse. They are more apt to occur if there is atrial or conduction system disease such as left atrial enlargement in mitral stenosis. In community prospective studies, atrial premature complexes are not related to sudden death, as are ventricular premature beats in coronary disease. (12 Dec 1998) |
| atrial premature contraction | <cardiology> An premature heartbeat of atrial origin. Generally nonserious and typically exacerbated by stimulant use (for example alcohol, decongestants, caffeine, nicotine). (27 Sep 1997) |
| atrial septal defect | <cardiology> An inherited condition where there is nonclosure of the foramen ovale at birth, resulting in congenital heart disease. Usually asymptomatic until the third or fourth decades of life. Symptoms include exertional shortness of breath, fatigue and palpitations. Acronym: ASD (12 Jan 1998) |
| atrial septum | The wall between the two upper chambers (the right and left atrium) of the heart. (12 Dec 1998) |
| atrial sound | The sound produced in late diastole in association with ventricular filling due to atrial systole and related to reduced ventricular compliance. It is a low frequency oscillation that may be normal at older ages owing to a physiologic decline in ventricular compliance but is nearly always abnormal at younger ages if it is of high intensity or palpable. It is common in ventricular hypertrophy, particularly with hypertension, and is almost invariable during acute myocardial infarction. Fourth heart sounds may arise from the right or left ventricle or both. Synonym: atrial sound. (05 Mar 2000) |
Synonyms :
Synonyms :
Synonyms :
Synonyms : Atrophies
Synonyms : Anaspaz, AtroPen, Atropin Augenol, Atropine Sulfate, Atropine Sulfate, 3(S)-endo-Isomer, Atropine, 3(S)-endo-Isomer, Atropinol, Chauvin Brand of Atropine, Cytospaz, Hyoscyamine Sulfate, Survival Technology Brand of Atropine, Winzer Brand of Atropine
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| atrial septal defect |
an abnormal opening between the left and right atria of the heart
Ãâó: wordnet.princeton.edu/perl/webwn
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| atrioventricular |
relating to or affecting the atria and ventricles of the heart; "atrioventricular disease"
Ãâó: wordnet.princeton.edu/perl/webwn
|
| atrioventricular block |
heart block: recurrent sudden attacks of unconsciousness caused by impaired conduction of the impulse that regulates the heartbeat
Ãâó: wordnet.princeton.edu/perl/webwn
|
| atrioventricular bundle |
a bundle of modified heart muscle that transmits the cardiac impulse from the atrioventricular node to the ventricles causing them to contract
Ãâó: wordnet.princeton.edu/perl/webwn
|
| atrial artery |
the branch of the coronary artery that supplies the muscles of the atria
Ãâó: wordnet.princeton.edu/perl/webwn
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| ATR | a drug (trade name Atromid-S) that reduces lipids in the blood serum |
|---|---|
| ATR | belladonna |
| ATR | perennial Eurasian herb with reddish bell-shaped flowers and shining black berries |
| ATR | relating to or characterized by atrophy |
| ATR | a chronic autoimmune disease with inflammation of the joints and marked deformities |
| ATR | (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use |
| ATR | any weakening or degeneration (especially through lack of use) |
| ATR | a decrease in size of an organ caused by disease or disuse |
| ATR | undergo atrophy |
| ATR | booklice |
| ATR | a poisonous crystalline alkaloid extracted from the nightshade family |
| ATR | the Fate who cuts the thread of life |
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