| MSN | main sensory nucleus; Master of Science in Nursing; mildly subnormal |
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| LAD | 1) Left Axis Deviation; 좌축 편위 2) Left Anterior Descending coronary artery... |
| LAA | left atrial appendage; left atrial area; leukemia-associated antigen; leukocyte ascorbic acid |
| LAC | La Crosse [virus]; lactase; left atrial circumflex [artery]; left atrial contraction; linguoaxiocerv... |
| LAD | lactic acid dehydrogenase; left anterior descending [artery]; left axis deviation; leukocyte adhesio... |
| left ventricular ejection time | The time measured clinically from onset to incisural notch of the carotid or other pulse; properly the time of ejection of blood from the left ventricle beginning with aortic valve opening and ending with aortic valve closure. (05 Mar 2000) |
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| left ventricular failure | <cardiology> A disorder where the left side of the heart fails to pump blood effectively. This results in a back flow (and pressure) and congestion of blood into the lungs. The causes of this condition include, valvular heart disease, cardiomyopathy, anaemia, hyperthyroidism, atrial myxoma, drug toxicity and congenital heart disease. Risk factors include diabetes, alcoholism, obesity and smoking. Symptoms include increasing shortness of breath with activity and while lying flat. Other symptoms include cough, palpitations, fatigue, decreased urine production and waking in the middle of the nigh with difficulty breathing. Complications include pulmonary oedema, arrhythmias and pleural effusion. (27 Sep 1997) |
| left ventricular hypertrophy | <radiology> Coarctation, aortic stenosis (12 Dec 1998) |
| left ventricular myomectomy | Resection of myocardial tissue used in cases of idiopathic hypertrophic subaortic stenosis. (05 Mar 2000) |
| left ventricular volume overload | <radiology> VSD, patent ductus arteriosus, mitral incompetence, aortic incompetence (12 Dec 1998) |
| ligament of left superior vena cava | The obliterated left common cardinal vein that extends from the left brachiocephalic vein to the oblique vein of the left atrium. (05 Mar 2000) |
| ligament of left vena cava | The obliterated left common cardinal vein; it extends from the left brachiocephalic vein to the oblique vein of the left atrium. Synonym: ligamentum venae cavae sinistrae. (05 Mar 2000) |
| lingula of left lung | An inferomedial projection from the anterior aspect of the upper lobe of the left lung which bounds the cardiac notch inferiorly. Synonym: lingula pulmonis sinistri. (05 Mar 2000) |