| RBCD | right border cardiac dullness |
|---|---|
| RCD | relative cardiac dullness |
| CAC | cardiac-accelerator center; cardiac arrest code; circulating anticoagulant |
| CAS | calcarine sulcus; calcific aortic stenosis; Cancer Attitude Survey; carbohydrate-active steroid; car... |
| CI | cardiac index; cardiac insufficiency; cell immunity; cell inhibition; cephalic index; cerebral infar... |
| absolute zero | <chemistry, physics> This is the lowest possible temperature (0 Kelvin, -273.15 degrees Celsius, -459.67 degrees Fahrenheit). at this temperature, all molecular motion stops. (15 Jan 1998) |
|---|---|
| atmosphere absolute | <physics> A unit of absolute pressure (also known as barometric pressure) expressed in atm. (05 Mar 2000) |
| CD4 count, absolute | The number of helper T-lymphocytes in a cubic millimeter of blood. With HIV, the absolute CD4 count declines as the infection progresses. The absolute CD4 count is frequently used to monitor the extent of immune suppression in persons with HIV. Also called a T4 count. (12 Dec 1998) |
| abnormal cleavage of cardiac valve | Congenital malformation of a valve leaflet with a defect extending from the free margin. (05 Mar 2000) |
| anterior cardiac veins | Two or three small veins in the anterior wall of the right ventricle opening directly into the right atrium independently of the coronary sinus. Synonym: venae cordis anteriores. (05 Mar 2000) |
| cardiac | <cardiology> Pertaining to the heart. Origin: L. Cardiacus from Gr. Kardiakos (16 Dec 1997) |
| cardiac accident | Sudden cardiac catastrophe, such as may result from coronary occlusion. (05 Mar 2000) |
| cardiac albuminuria | Albuminuria caused by congestive heart failure. (05 Mar 2000) |
| cardiac alternation | The occurrence of any cardiac phenomenon every other beat. (05 Mar 2000) |
| cardiac aneurysm | Thinning, stretching, and bulging of a weakened ventricular wall, usually as a result of myocardial infarction; rarely postinflammatory or congenital. Synonym: mural aneurysm, ventricular aneurysm. (05 Mar 2000) |
| cardiac arrest | This refers to the complete cessation of cardiac activity (heartbeat). (27 Sep 1997) |
| cardiac arrhythmia | A disturbance the electrical activity of the heart that manifests as an abnormality in heart rate or heart rhythm. Patients with a cardiac arrhythmia may experience a wide variety of symptoms ranging from palpitations to fainting. (27 Sep 1997) |
| cardiac asthma | An asthmatic attack, the bronchoconstriction being secondary to the pulmonary congestion and oedema of left ventricular failure. (05 Mar 2000) |
| cardiac ballet | Short runs of cardiac dysrhythmia consisting of uniform sequences of repetitive multiform extrasystoles; so called from its undulating appearance, originally described by Bellet. See: torsade de pointes. (05 Mar 2000) |
| cardiac blood pool imaging | This noninvasive test uses radioactive tracers to delineate the hearts chambers and major vessels. It may be used to detect a heart attack, heart muscle function and coronary artery disease. The patient receives a radioactive tracer by injection (into a vein) and then the heart is imaged using a gamma camera. The heart is imaged before and after exercise. This test may be used to detect and evaluate atrial septal defect, dilated cardiomyopathy, congestive heart failure, cardiomyopathy, Lyme disease (secondary), mitral stenosis and superior vena cava syndrome. (27 Sep 1997) |