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 Yan Xin Liang

Pediatrics

1min 20sec

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Is Tetralogy of Fallot serious?

Tetralogy of Fallot is the most common cyanotic congenital heart disease in children, accounting for about 10% of congenital heart diseases. It is a complex type of congenital heart condition, consisting of four defects: a ventricular septal defect, right ventricular outflow tract obstruction, overriding aorta, and right ventricular hypertrophy. Due to these four malformations, children will experience cyanosis, poor exercise tolerance, and may quickly become fussy or emotionally disturbed with physical activity. This can lead to noticeable worsening of dyspnea and cyanosis. They may also exhibit a preference for squatting, as squatting can decrease the return blood volume to the heart, increase systemic vascular resistance, and temporarily relieve hypoxic symptoms. Other symptoms include clubbing, paroxysmal hypoxia attacks which are more common in infants. These attacks can be triggered by crying, emotional excitement, anemia, infections, etc., and suddenly manifest as paroxysmal breathing difficulties. In severe cases, there can be fainting, convulsions, and even death. Therefore, these clinical manifestations are very serious, making this disease a significantly dangerous condition.

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Written by Chen Guang Yin

Cardiology

44sec

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Does Tetralogy of Fallot involve chromosomal abnormalities?

Tetralogy of Fallot is primarily a developmental disorder, generally unrelated to chromosomes, with no chromosomal abnormalities. The cause of the disease is still not very clear. If pregnant again and giving birth again, it generally does not recur. Therefore, couples undergoing chromosomal testing before pregnancy is a common practice. It is generally believed that the four malformations in Tetralogy of Fallot occur due to viral infections acquired by the fetus during pregnancy, the mother consuming alcohol, or the use of certain medications during pregnancy. Currently, these are considered related factors, and so far, no abnormalities have been found related to genetics or chromosomes.

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Written by Hu Qi Feng

Pediatrics

40sec

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Tetralogy of Fallot cyanosis cause

Tetralogy of Fallot, due to a ventricular septal defect combined with right ventricular outflow tract narrowing, can display left-to-right, bidirectional, or even right-to-left shunting at the ventricular level. Patients with mild pulmonary stenosis can have left-to-right shunting and usually do not exhibit cyanosis. However, when the pulmonary stenosis is severe, significant right-to-left shunting occurs, and clinically apparent cyanosis becomes evident. Cyanosis is commonly observed in areas rich in capillaries and superficial tissues, such as the lips, fingertips, nail beds, and bulbar conjunctiva.

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Written by Hu Qi Feng

Pediatrics

39sec

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Tetralogy of Fallot Emergency Measures

Generally, one should often drink water to prevent infection, prevent dehydration and complications. Infants and young children should be especially careful in their care, to avoid episodes of paroxysmal hypoxia. In mild cases of hypoxic episodes, placing them in a knee-chest position can alleviate the symptoms. In severe cases, oxygen should be administered immediately, along with the appropriate drug treatment. If the episodes cannot be effectively controlled with medication, emergency surgical intervention may be necessary. With the continuous improvement in surgical techniques this year, the mortality rate for curative surgeries has been decreasing.

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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.