What are the <u>main</u>&nbsp;<b>duct-dependent congenital heart diseases (CHD)?</b>&nbsp;<br><br>{{c1::transposition of great arteries}} {{c1::hypoplastic left heart syndrome}} {{c1::coarctation of aorta}}<br>{{c1::tricuspid atresia}}

Duct dependent diseases refer to a group of heart conditions that require patent ductus arteriosus (PDA) to sustain life.&nbsp;<br><br>Severe aortic stenosis, pulmonary stenosis and ToF can also be included alongside the conditions mentioned above.<br><br><div class="centeredbox"><div class="leftalign">In TGA, right heart is pumping to aorta (systemic) without oxygenating, ∴ PDA can provide O₂ via pulmonary artery&nbsp;<br>In hypoplastic left heart syndrome, left ventricle sucks, can't pump enough to aorta (systemic), so right heart pumps to pulmonary artery through PDA to aorta, supplying lungs and body<br>In coarctation of aorta, the narrowing in aorta severely reduces systemic CO ∴ PDA can bypass this, blood given to aorta from pulmonary artery<br>In tricuspid atresia, no blood is being pumped to lungs. ∴ PDA can allow blood from aorta → pulmonary artery to be oxygenated at lungs<br></div></div><img src="7ace441e45674bbeb5de6c16803f787c.webp"><br><img src="fe6d72d6c10dc196bf82f50351380c35.webp"><br>

Cardiology. Paediatric Handbook RCH pg 170.&nbsp;Accessed May 21, 2024.<br>Cyanotic congenital heart defects. AMBOSS.&nbsp;<a href="https://next.amboss.com/us/article/Oo0IXS?m=a-bQDw">https://next.amboss.com/us/article/Oo0IXS?m=a-bQDw</a>. Accessed May 21, 2024