The narrowing might also affect the muscle beneath the pulmonary valve. Narrowing of the valve that separates the lower right chamber of the heart (right ventricle) from the main blood vessel leading to the lungs (pulmonary artery) reduces blood flow to the lungs. Narrowing of the lung valve (pulmonary valve stenosis).Tetralogy of Fallot includes four defects: Tetralogy of Fallot occurs as the baby's heart is developing during pregnancy. Call 911 or your local emergency number immediately. This helps increase blood flow to the lungs. If your baby becomes blue (cyanotic), place your baby on his or her side and pull your baby's knees up to his or her chest. Seek medical help if you notice that your baby has the following signs or symptoms: Squatting increases blood flow to the lungs. Toddlers or older children might instinctively squat when they're short of breath. Tet spells are most common in young infants, around 2 to 4 months old. Tet spells are caused by a rapid drop in the amount of oxygen in the blood. Sometimes, babies who have tetralogy of Fallot will suddenly develop deep blue skin, nails and lips after crying or feeding, or when agitated. An abnormal, rounded shape of the nail bed in the fingers and toes (clubbing).Shortness of breath and rapid breathing, especially during feeding or exercise.A bluish coloration of the skin caused by low blood oxygen levels (cyanosis).Tetralogy of Fallot symptoms vary, depending on the amount of blood flow that's blocked.
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