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| Lecompte manoeuvre | The pulmonary artery is brought anterior to the aorta during an arterial switch procedure in patients with d-transposition of the great arteries. see also Jatene procedure. |
| LEOPARD syndrome | This autosomal dominant condition includes Lentigines, ECG abnormalities, Ocular hypertelorism, Pulmonary stenosis, Abnormal genitalia, Retardation of growth, and Deafness. Rarely, cardiomyopathy or complex congenital heart disease may be present. |
| levocardia | Leftward oriented cardiac apex (normal). see cardiac position. |
| levoposition | Leftward shift of the heart. see cardiac position. |
| ligamentum arteriosum | A normal fibrous structure that is the residuum of the ductus arteriosus after its spontaneous closure. |
| long-QT syndrome | Abnormal prolongation of QT-duration with subsequent risk for torsade de pointes, syncope and sudden cardiac death. It may be congenital or acquired (medications such as antiarrhythmics, antihistamines, some antibiotics; electrolyte disturbances such as hypocalcemia, hypomagnesemia, hyopkalemia; hypothyroidism; and other factors.). QT-interval must be adjusted to heart rate. |
| looping | Bending of the primitive heart tube (normally to the right, dextro, d-) that determines the atrio-ventricular relationship. |
| d-loop | morphologic right ventricle lies to the right of the morphologic left ventricle (normal rightward bend). |
| l-loop | morphologic right ventricle lies to the left of the morphologic left ventricle (leftward bend). |
| Lutembacher syndrome | Atrial septal defect associated with mitral valve stenosis. The mitral valve stenosis is usually acquired (rheumatic). |
| LVOTO | Left ventricular outflow tract obstruction. |