279316009: Atrioventricular (non-mitral, non-tricuspid) valve structure (body structure)

SNOMED CT Concept\Body structure\Anatomical or acquired body structure (body structure)\Anatomical structure\...

\Structure of anatomical cluster (body structure)\Structure of anatomical compartment (body structure)\Structure of body cavity and/or content\Structure of thoracic cavity and/or content\...

\Intrathoracic cardiovascular structure\Heart and/or pericardium structure\Heart structure\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure

\Mediastinal structure\Structure of region of mediastinum (body structure)\Structure of inferior mediastinum (body structure)\Subdivision of inferior mediastinum\Middle mediastinum structure\Heart and/or pericardium structure\Heart structure\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure

\Structure of thoracic viscus\Heart structure\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure

\Body organ structure\Structure of viscus (body structure)\Structure of thoracic viscus\Heart structure\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure
\Body organ structure\Organ part (body structure)\Cardiovascular organ part\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure

\Body system structure\Lung and/or mediastinal structures\Mediastinal structure\Structure of region of mediastinum (body structure)\Structure of inferior mediastinum (body structure)\Subdivision of inferior mediastinum\Middle mediastinum structure\Heart and/or pericardium structure\Heart structure\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure
\Body system structure\Structure of cardiovascular system (body structure)\Regional cardiovascular structure (body structure)\Cardiovascular structure of trunk\Intrathoracic cardiovascular structure\Heart and/or pericardium structure\Heart structure\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure
\Body system structure\Structure of cardiovascular system (body structure)\Cardiovascular organ part\Heart part (body structure)\Cardiac internal structure\Cardiac valve structure\Atrioventricular (non-mitral, non-tricuspid) valve structure

Status: current, Not sufficiently defined by necessary conditions definition status (core metadata concept). Date: 31-Jan 2002. Module: SNOMED CT core

Descriptions:

Expanded Value Set

Outbound Relationships	Type	Target	Active	Characteristic	Refinability	Group	Values
Atrioventricular (non-mitral, non-tricuspid) valve structure	Is a	Cardiac valve structure	true	Inferred relationship	Existential restriction modifier (core metadata concept)
Atrioventricular (non-mitral, non-tricuspid) valve structure	partie de	Entire heart	false	Additional relationship (core metadata concept)	Existential restriction modifier (core metadata concept)

Inbound Relationships	Type	Active	Source	Characteristic	Refinability	Group
Tricuspid leaflet abnormality	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Straddling mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Transient mitral regurgitation of newborn (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Congenital absence of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital insufficiency of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Dilatation of tricuspid annulus	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Ebstein's anomaly with atrial septal defect	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Tricuspid valve prolapse	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Cleft leaflet of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Accessory tissue on tricuspid leaflet	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital hypoplasia of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
[X]Congenital malformation of tricuspid valve, unspecified	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital tricuspid atresia or stenosis NOS	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Balloon dilation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital stenosis of tricuspid valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Myxoid transformation of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital hypertrophy of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Rotation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Mitral leaflet dysplasia	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Replacement of implanted atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital stenosis of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Abnormality of atrioventricular (non-mitral, non-tricuspid) valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Tricuspid leaflet dysplasia	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
[X]Other congenital malformations of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital abnormal shape of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Double orifice of tricuspid valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Accessory tissue on mitral leaflet	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Supramitral left atrial ring	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Overriding tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital tricuspid atresia and stenosis	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Straddling tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital hypertrophy of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital mitral stenosis, unspecified	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Lutembacher's anomaly	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Parachute malformation of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Cleft leaflet of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Fused commissures of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Inspection of implanted atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Dilation of mitral annulus	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital anomaly of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Ebstein-like downward displacement of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital atresia of mitral valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Congenital absence of mitral valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Absent tricuspid leaflet	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Tricuspid annulus hypoplasia	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Anterior leaflet of mitral valve attached to septum	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital anomaly of tricuspid valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Transient tricuspid regurgitation of newborn	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital hypoplasia of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Ebstein's anomaly	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Supernumerary cusps of the mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Ebstein-like malformation of mitral valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital atresia of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital supravalvular mitral stenosis	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Double mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Congenital mitral stenosis NOS	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Congenital insufficiency of tricuspid valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Inspection of atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Overriding mitral valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital abnormal shape of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Tricuspid leaflet abnormality	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Straddling mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Transient mitral regurgitation of newborn (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital absence of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital insufficiency of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Dilatation of tricuspid annulus	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Ebstein's anomaly with atrial septal defect	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Tricuspid valve prolapse	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Cleft leaflet of mitral valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Accessory tissue on tricuspid leaflet	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital hypoplasia of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
[X]Congenital malformation of tricuspid valve, unspecified	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital tricuspid atresia or stenosis NOS	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Balloon dilation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Congenital stenosis of tricuspid valve (disorder)	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Myxoid transformation of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Congenital hypertrophy of tricuspid valve	Finding site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Rotation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	3
Replacement of implanted atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Inspection of implanted atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Inspection of implanted atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Inspection of atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Inspection of atrioventricular valve	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Balloon dilation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Balloon dilation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Rotation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Rotation of implanted atrioventricular valve (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Prosthetic replacement of atrioventricular valve chordae tendinae	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Fenestration operation to atrioventricular valve chordae tendinae (procedure)	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Operation on atrioventricular valve leaflet	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Resection of atrioventricular valve leaflet (procedure)	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Excision of lesion from atrioventricular valve leaflet	Procedure site	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Excision of vegetations from atrioventricular valve	Procedure site - Indirect (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Excision of vegetations from implanted atrioventricular valve	Procedure site - Indirect (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Replacement of atrioventricular (non-mitral non-tricuspid) valve (procedure)	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Replacement of atrioventricular (non-mitral non-tricuspid) valve (procedure)	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Homograft atrioventricular valve replacement	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Homograft atrioventricular valve replacement	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Xenograft atrioventricular valve replacement	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	1
Xenograft atrioventricular valve replacement	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2
Mechanical prosthetic atrioventricular valve replacement	Procedure site - Direct (attribute)	False	Atrioventricular (non-mitral, non-tricuspid) valve structure	Inferred relationship	Existential restriction modifier (core metadata concept)	2

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Reference Sets

Anatomy structure and entire association reference set (foundation metadata concept)

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Id	Description	Lang	Type	Status	Case?	Module
416536014	Atrioventricular (non-mitral, non-tricuspid) valve structure	en	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core
672585010	Atrioventricular (non-mitral, non-tricuspid) valve structure (body structure)	en	Fully specified name	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core
1225649013	Atrioventricular valve structure	en	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core
416536014	Atrioventricular (non-mitral, non-tricuspid) valve structure	en	Synonym (core metadata concept)	Active	Only initial character case insensitive (core metadata concept)	SNOMED CT core
416536014	Atrioventricular (non-mitral, non-tricuspid) valve structure	en	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core
672585010	Atrioventricular (non-mitral, non-tricuspid) valve structure (body structure)	en	Fully specified name	Active	Only initial character case insensitive (core metadata concept)	SNOMED CT core
672585010	Atrioventricular (non-mitral, non-tricuspid) valve structure (body structure)	en	Fully specified name	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core
1225649013	Atrioventricular valve structure	en	Synonym (core metadata concept)	Active	Only initial character case insensitive (core metadata concept)	SNOMED CT core
1225649013	Atrioventricular valve structure	en	Synonym (core metadata concept)	Active	Entire term case insensitive (core metadata concept)	SNOMED CT core