Cyanotic Heart Disease

The Zero to Finals Medical Revision Podcast

Thomas Watchman

Life Sciences, Education, Medical Finals, Medicine, Surgery, Health & Fitness, Paediatrics, Medical Student, Medical Education, Medical Exams, Medical School, Medical Revision, Science, Learn Medicine, Finals Revision, Obstetrics And Gynaecology

4.8 • 678 Ratings

🗓️ 23 December 2024

⏱️ 3 minutes

🔗️ Recording | iTunes | RSS

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Summary

This episode covers cyanotic heart disease. Written notes can be found at https://zerotofinals.com/paediatrics/cardiology/cyanoticheartdisease/ Books can be found at https://zerotofinals.com/books/ Questions can be found at https://members.zerotofinals.com/dashboard The audio in the episode was expertly edited by Harry Watchman.

Transcript

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0:00.0	Hello and welcome to the zero to finals podcast. My name is Tom and in this episode I'm going to be
0:09.0	talking to you about cyanotic heart disease. And you can find written notes on this topic at
0:14.6	zero to finals.com slash cyanotic heart disease or in the zero to finals pediatrics book, and you can find questions to train your
0:25.1	knowledge at members.0.0.0.com. So let's get straight into it. Cyanosis occurs when deoxygenated
0:35.1	blood, or blood without oxygen in it enters the systemic circulation and it causes
0:41.8	a bluish purple discoloration of the skin. Cyanotic heart disease occurs when blood bypasses the
0:50.2	pulmonary circulation and the lungs across a right to left shunt.
0:56.0	A right to left shunt occurs when a defect allows blood to flow from the right side of
1:02.1	the heart, the deoxygenated blood returning from the body, to the left side of the heart,
1:08.6	which is the blood exiting the heart into the systemic circulation,
1:13.4	without travelling to the lungs to get oxygenated.
1:17.8	Heart defects that can cause a right-to-left shunt and therefore cyanotic heart disease are
1:24.7	ventricular septal defect or VSD, atrial septal defect or ASD, patent ductus arteriosus
1:35.3	or PDA, and transposition of the great arteries. Patients with a ventricular septal defect, an atrialceptal defect, or a patent ductus arteriosis, are usually not cyanotic.
1:52.8	This is because the pressure in the left side of the heart is much greater than the pressure in the right side.
1:59.6	Blood will flow from the area of high pressure to the
2:03.2	area of low pressure, and this prevents a right to left shunt. If the pulmonary pressure, or the
2:10.8	pressure inside the lungs, increases beyond the systemic pressure, blood will start to flow from the right side of the heart to the left
2:19.5	across the defect, and this will cause cyanosis. When this happens, this is called Eisenmengar
2:27.9	syndrome. Patients with transposition of the great arteries will always have cyanosis.
2:35.0	The aorta is attached to the right ventricle.
2:39.0	Blood drains from the systemic venous system into the right side of the heart,
	...

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