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<p>The <strong>tetralogy of Fallot</strong> is a <a href="/wiki/Congenital_heart_defect" title="Congenital heart defect">congenital heart defect</a> which classically has four anatomical components. It is the most common <a href="/wiki/Cyanosis" title="Cyanosis">cyanotic</a> heart defect and the most common cause of <a href="/wiki/Blue_baby_syndrome" title="Blue baby syndrome">blue baby syndrome</a>.</p>
<p>It was first described by <a href="/wiki/Niels_Stensen" title="Niels Stensen">Niels Stensen</a> in <a href="/wiki/1672" title="1672">1672</a>. In <a href="/wiki/1888" title="1888">1888</a> the French physician <a href="/wiki/Etienne_Fallot" title="Etienne Fallot">Etienne Fallot</a> accurately detailed its four anatomical characteristics.<br />
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<p>It was first described by <a href="/wiki/Niels_Stensen" title="Niels Stensen">Niels Stensen</a> in <a href="/wiki/1672" title="1672">1672</a>. In <a href="/wiki/1888" title="1888">1888</a> the French physician <a href="/wiki/Etienne_Fallot" title="Etienne Fallot">Etienne Fallot</a> accurately detailed its four anatomical characteristics.<br />
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