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Tetralogy of Fallot
Tetralogy of Fallot Clinical Characteristics
Tetralogy of Fallot is the most common cyanotic congenital heart disease in infancy, accounting for about 12% of all congenital heart diseases. It is caused by malformations of four heart structures: 1. right ventricular outflow tract obstruction; 2. ventricular septal defect; 3. overriding aorta; 4. right ventricular hypertrophy. Its clinical manifestations may include cyanosis, squatting symptoms, clubbed fingers, and paroxysmal hypoxia attacks. Physical examinations generally show delayed development, a prominent precordial area, and at the second to fourth rib interspace along the left sternal margin, a grade 2 to 3 rough systolic murmur can be heard.
Emergency treatment for cyanosis in Tetralogy of Fallot
During hypoxic attacks of Tetralogy of Fallot, for mild cases, adopting the knee-chest position can provide relief. Severe cases should immediately receive oxygen and be given relevant medication treatment. Normally, attention should be paid to removing factors that cause hypoxic attacks, such as anemia and infections, and keep the child as calm as possible. For cases where hypoxia cannot be effectively controlled through the above measures, emergency surgical repair should be considered.
Tetralogy of Fallot seizure causes
The cause of seizures in Tetralogy of Fallot is episodic hypoxia leading to cerebral hypoxia, which causes seizures, commonly seen in infants. These seizures can be triggered by feeding, crying, emotional excitement, anemia, or infections, manifesting as episodic breathing difficulties. In severe cases, sudden fainting, convulsions, or even death may occur. The underlying cause is the narrowing of the pulmonary artery infundibulum and sudden muscle spasms, which lead to temporary pulmonary artery obstruction, worsening cerebral hypoxia.
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.
Tetralogy of Fallot syncope causes
The causes of syncope in Tetralogy of Fallot generally involve episodic hypoxia attacks, which are more common in infants. Triggers include breastfeeding, crying, emotional excitement, anemia, and infections. The symptoms manifest as episodic breathing difficulties, and severe cases can suddenly lead to syncope with convulsions or even death. The underlying reason is the narrowing of the pulmonary artery infundibulum accompanied by muscular spasms, causing obstruction of the pulmonary artery and intensifying cerebral hypoxia. Older children may complain of headaches and dizziness.
Tetralogy of Fallot Clinical Symptoms
The clinical manifestations of Tetralogy of Fallot include cyanosis, with cyanosis being the primary symptom. The severity of cyanosis is related to the extent of pulmonary stenosis and is commonly seen in areas rich in capillaries, such as the lips, fingertips, nail beds, and conjunctiva, where it appears more pronounced during physical activity or crying. Secondly, the squatting symptom is observed; children may show squatting behavior during walking or playing, often squatting down voluntarily for a moment. During squatting, the flexion of the lower limbs reduces the venous return to the heart, lightening the cardiac load and decreasing the right-to-left shunting, thereby alleviating hypoxia. Thirdly, clubbing of the fingers occurs due to long-term hypoxia, leading to hypertrophic growth at the fingertip and toe ends. Fourthly, paroxysmal hypoxic attacks occur.
Is Tetralogy of Fallot hereditary?
Tetralogy of Fallot is a common cyanotic congenital heart disease in children, accounting for about ten percent of congenital heart diseases. It primarily consists of four abnormalities: ventricular septal defect, right ventricular outflow tract obstruction, overriding aorta, and left ventricular hypertrophy. Congenital heart disease is not a hereditary disease; it is not controlled by genes, mainly due to abnormal development of the heart and blood vessels during fetal development, leading to cardiovascular malformations. Thus, this disease is not hereditary.
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.
Tetralogy of Fallot is what?
Tetralogy of Fallot is the most common cyanotic congenital heart disease in infants, accounting for about twelve percent of all congenital heart diseases. It was thoroughly described by the French physician Fallot in 1888, which is how it got its name. Tetralogy of Fallot consists of four cardiac malformations: first, obstruction of the right ventricular outflow tract; second, ventricular septal defect; third, overriding aorta; fourth, right ventricular hypertrophy.
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.