Management of Hypoxic Episodes in Children with Tetralogy of Fallot

Written by Hu Qi Feng

Pediatrics

Updated on September 04, 2024

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In the treatment of hypoxic episodes in children with Tetralogy of Fallot, mild cases can be alleviated by positioning the child in a knee-chest position, while severe cases should receive immediate oxygen therapy, along with appropriate medication to correct acidosis. It is important to regularly eliminate factors that may trigger hypoxic episodes, such as anemia and infections, and to maintain a calm environment for the child. If these measures do not effectively control the episodes, emergency surgical repair should be considered.

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Written by Yao Li Qin

Pediatrics

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Tetralogy of Fallot electrocardiogram manifestations

Tetralogy of Fallot is a common type of cyanotic congenital heart disease, primarily composed of four structural components: first, a ventricular septal defect; second, an overriding aorta; third, hypertrophy of the right ventricle; and fourth, obstruction of the right ventricular outflow tract. When performing an electrocardiogram (ECG) on Tetralogy of Fallot, it often shows right ventricular hypertrophy, and can also display right atrial hypertrophy. Initially, there may be hypertrophy of both the left and right ventricles. As the child develops cyanosis, it progressively evolves into hypertrophy of the right ventricle. These are the typical ECG findings in Tetralogy of Fallot.

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Written by Yan Xin Liang

Pediatrics

1min 11sec

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The main cause of hypoxic attacks in Tetralogy of Fallot

Tetralogy of Fallot is a complex congenital heart disease, characterized by ventricular septal defect, right ventricular outflow tract obstruction, aorta overriding, and right ventricular hypertrophy. When the obstruction of the right ventricular outflow tract is severe, pulmonary artery blood flow significantly decreases. A large amount of unoxygenated venous blood passes through the ventricular septal defect causing a right-to-left shunt, which clinically manifests as severe cyanosis and increased red blood cells, and different degrees of hypoxia in the systemic circulation. Factors that can induce hypoxic episodes in these infants include feeding, crying, emotional agitation, anemia, infection, etc. These can suddenly lead to fainting, convulsions, or even death. The main reason is generally due to a sudden muscle spasm at the narrow pulmonary artery infundibulum on top of pre-existing stenosis, causing temporary pulmonary artery obstruction and exacerbating cerebral hypoxia, thus leading to severe hypoxic attacks.

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Written by Hu Qi Feng

Pediatrics

1min 10sec

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Tetralogy of Fallot symptoms in infants

Infants with Tetralogy of Fallot often exhibit the following symptoms: First, cyanosis, which is most apparent in areas rich in capillaries such as the lips, fingernail beds, and conjunctiva. Cyanosis tends to worsen gradually during crying, emotional distress, or physical exertion. Second, squatting symptoms; infants who cannot walk often prefer to be held by adults in a flexed position of both lower limbs, reducing venous return and easing the cardiac workload. Older children often exhibit squatting during activities such as walking and playing, frequently squatting down momentarily. Third, infants in a prolonged hypoxic environment may develop clubbing, characterized by the enlargement of the fingertips and toes, with capillary expansion and proliferation, resembling drumsticks. Fourth, episodic hypoxia occurs predominantly in infants, triggered by feeding, crying, or emotional distress, manifesting as episodes of respiratory difficulty, with severe cases leading to sudden fainting or convulsions.

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Written by Hu Qi Feng

Pediatrics

37sec

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Tetralogy of Fallot in children who prefer squatting is because

Tetralogy of Fallot exhibits squatting symptoms because squatting involves flexing the lower limbs, which reduces the amount of venous return to the heart, thereby decreasing the cardiac workload. At the same time, the arteries of the lower limbs are compressed, increasing systemic vascular resistance, reducing right-to-left shunting, and temporarily alleviating hypoxia symptoms. Infants who cannot walk often prefer to be held with their thighs up, with both lower limbs bent; after they become able to walk, they frequently squat down momentarily during walking or playing.

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Written by Chen Guang Yin

Cardiology

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Is it normal after the complete repair of Tetralogy of Fallot?

Tetralogy of Fallot is a serious congenital heart defect characterized by a ventricular septal defect, pulmonary stenosis, and problems with right ventricular obstruction. It is a congenital disease that can cause hypoxia throughout the body, especially as age increases, the symptoms tend to worsen. After the corrective surgery for Tetralogy of Fallot, it does not mean that the patient is completely normal. Their lifespan is still somewhat impacted. They will not be like patients with simpler congenital heart diseases such as only a ventricular septal defect or atrial septal defect, who can achieve a natural lifespan. For these individuals, their lifespan is still impacted to some extent. As they age post-surgery, some complications may arise, including sudden death, and some may require a second surgery.