Glossary

0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mandrin
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Metal guide for a flexible catheter, which is removed after insertion of the catheter

MAPCA
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Major aortopulmonary collateral artery; for improving pulmonary circulation

Mapping
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1.    electrophysiological examination using a catheter and a special electrode, the foundation for surgical treatment of tachyardia
2.     nonsurgical electrocardiographic technique to establish the size of a heart attack. Image of the action potential of a heart attack mapped at numerous points on the surface of the body

Microangiopathy
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Impaired circulation in the capillaries

Microcephalus
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An abnormally small head

Mitral valve
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Bicuspid valve situated between the left atrium and the left ventricle

Mitral valve insufficiency
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The mitral valve is unable to close. Some of the blood is regurgitated from the left ventricle into the left atrium; the left ventricle therefore has to increase pumping capacity

Mitral valve prolapse
floppy valve syndrome

Congenital weakness of the connective tissue. The mitral valve balloons into the left atrium, can cause inadequate valve closure

Mitral valve stenosis
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Abnormal narrowing of the mitral valve. Can cause distension of the left atrium and lead to the retention of blood in the lungs

Modification/modified
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Version, type of operation (e.g. modified Fontan operation)

Monogenic
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Resulting from a single cause (determined by a single gene)

Mortality
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Death rate

MRI
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See nuclear spin tomography

Mucocutaneous lymph node syndrome
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Kawasaki disease.

Multifactorial
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More than one cause

Muscle hypotonia
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Reduced muscle tone (see hypotonia)

Mustard operation
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Functional correction (palliative operation); atrial switch to transpose the great arteries (TGA). Was common up to about 1990 instead of the arterial switch (see also Senning operation)

Myocardial infarct
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See heart attack

Myocarditis
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(Usually) viral inflammation of the myocardium

Myocardium
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Cardiac muscle, the muscle wall of the heart

Author(s): Kinderherzstiftung, Prof. Dr. Elisabeth Sticker, Hermine Nock
Last updated: 2009-04-28