Editing Tetralogy of Fallot (section)

=== Mitral valve stenosis ===
Mitral valve stenosis is an uncommon cardiac abnormality that can occur at birth (congenital) or develop later in life (acquired).<ref name="Shah_2021">{{cite book|vauthors=Shah SN, Sharma S|chapter=Mitral Stenosis|date=2021|chapter-url=http://www.ncbi.nlm.nih.gov/books/NBK430742/|title=StatPearls|place=Treasure Island (FL)|publisher=StatPearls Publishing|pmid=28613493|access-date=2021-12-01|archive-date=2021-02-25|archive-url=https://web.archive.org/web/20210225051404/https://www.ncbi.nlm.nih.gov/books/NBK430742/|url-status=live}}</ref><ref name="NORD" /> The aberrant narrowing of the mitral valve's opening characterizes this condition.<ref name="Shah_2021" /><ref name="NORD" /> There are two versions of this condition known as congenital and acquired characterized by different symptoms.<ref name="NORD" /> Congenital Mitral valve stenosis symptoms include a wide array such as respiratory infections, breathing difficulties, heart palpitations and coughing.<ref name="NORD" /> Acquired mitral valve stenosis symptoms also include a wide array such as consciousness losses, angina, general weakness and abdominal discomfort.<ref name="NORD" />