| ADN | antideoxyribonuclease; aortic depressor nerve; associate degree in nursing |
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| AES | acetone-extracted serum; American Electroencephalographic Society; American Encephalographic Society... |
| AF | abnormal frequency; acid-fast; adult female; afebrile; aflatoxin; albumin-free; albumose-free; aldeh... |
| AFV | amniotic fluid volume; aortic flow velocity |
| ALVT | aortic and left ventricular tunnel |
| right aortic arch | <radiology> Types: mirror image branching (95% most likely to be congenital ht disease), 90% tetralogy of Fallot (TOF) (25%) ** decreased PBF, 2.5% truncus (30-50%) ** increased PBF, 1.5% transposition (TGV) (5%), aberrant left subclavian artery (5% most likely to be congenital heart disease) (12 Dec 1998) |
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| secondary aortic area | Region of the chest at the mid-left sternal bases where aortic diastolic murmurs are often best heard. (05 Mar 2000) |
| Sibson's aortic vestibule | Synonym: aortic vestibule. (05 Mar 2000) |
| subvalvular aortic stenosis | <radiology> Types: anatomic/fixed subaortic stenosis: associated with cardiac defects in 50% (usually VSD), functional/dynamic subartic stenosis: asymetrical septal hypertrophy (ASH), idiopathic hypertrophic subaortic stenosis (IHSS), hypertrophic obstructive cardiomyopathy (HOCM) findings: asymmetrically thicker ventricular septum than free wall of the left ventricle (95%), normal/small left and right ventricular cavities (95%), systolic anterior motion of the mitral valve, lucent subaortic filling defect in systole, coarse systolic flutter of valve cusps, may see mitral regurgitation (secondary to abnormal position of anterolateral pappilary muscle) see: aortic stenosis (12 Dec 1998) |
| supravalvar aortic stenosis-infantile hypercalcaemia syndrome | <syndrome> Supravalvar aortic stenosis associated with elfin facies, mental retardation, and hypercalcaemia; usually sporadic; perhaps an irregular dominant trait. (05 Mar 2000) |
| supravalvar aortic stenosis syndrome | <syndrome> Supravalvar aortic stenosis (usually membranous) sometimes associated with pulmonary valvular or peripheral arterial stenosis but with normal facies and mentality; autosomal dominant inheritance. Compare: Williams syndrome. (05 Mar 2000) |
| supravalvular aortic stenosis | <radiology> Types: localised hourglass narrowing just above aortic sinuses, discrete fibrous membrane above sinuses of Valsalva, diffuse tubular hypoplasia of ascending aorta and branching arteries associated with: peripheral pulmonary stenosis, valvular and discrete subvalvular aortic stenosis, Marfan syndrome, Williams syndrome findings: dilatation and tortuosity of coronary arteries (may undergo early atherosclerotic degeneration secondary to high pressure), narrowing of the supravalvular area (normal root diameter: 20-37mm), normal movement of cusps (12 Dec 1998) |
| double aortic arch | Congenital malformation of the aorta that splits and has a right and a left arch instead of a single arch. (05 Mar 2000) |
| double aortic stenosis | Subaortic stenosis associated with stenosis of the valve itself, both lesions being congenital. (05 Mar 2000) |
| intra-aortic balloon | An externally and intermittently inflatable balloon placed into the descending aorta and which, on activation during diastole, augments blood pressure and organ perfusion by its pulsatile thrust; then, on deflation, decreases the cardiac work with each systole-the so-called counterpulsation principle-by reducing cardiac afterload. (05 Mar 2000) |
| intra-aortic balloon pump | <cardiology, equipment> A device which is threaded into the aorta that augments the strength of the hearts contraction. The counter pulsation, produced by the inflation of a balloon within the aorta, provides an rhythmic increase in aortic pressures. The net effect is an increase in coronary artery blood flow. Intra-aortic balloon pump is a temporary lifesaving measure that is used to treat severe cardiac damage due to a massive heart attack. (27 Sep 1997) |
| intra-aortic balloon pumping | Counterpulsation in which a pumping unit synchronised with the patient's electrocardiogram rapidly fills a balloon in the aorta with helium or carbon dioxide in early diastole and evacuates the balloon at the onset of systole. As the balloon inflates, it raises aortic diastolic pressure, and as it deflates, it lowers aortic systolic pressure. The result is a decrease in left ventricular work and increased myocardial and peripheral perfusion. (12 Dec 1998) |
| thoracic aortic aneurysm | <radiology> Normal size: 4-5 cm, most aneurysms rupture when more than 10 cm, mean age: 65 years; M:F = 3:1 associated with: hypertension, coronary artery disease, abdominal aortic aneurysm symptoms: substernal, back, shoulder pain (25%), superior vena cava syndrome, dysphagia, stridor, dyspnea, hoarseness see: aortic aneurysm (12 Dec 1998) |
| thoracic aortic plexus | An autonomic plexus surrounding the thoracic aorta and passing with it through the aortic opening in the diaphragm, to become continuous with the abdominal aortic plexus. Synonym: plexus aorticus thoracicus. (05 Mar 2000) |
| familial aortic ectasia | <cardiology, syndrome> The concurrence as an autosomal dominant trait of bicuspid aortic valve often with premature calcification, ectasia and dissection of the aorta and, rarely, coarctation of the aorta. Superficially resembles the Marfan's syndrome. Synonym: familial aortic ectasia. (05 Mar 2000) |