Tetralogy of Fallot symptoms vary, depending on the amount of blood flow that's blocked. Signs and symptoms may include:  A bluish coloration of the skin caused by low blood oxygen levels (cyanosis) Shortness of breath and rapid breathing, especially during feeding or exercise Poor weight gain Tiring easily during play or exercise Irritability Prolonged crying Heart murmur Fainting An abnormal, rounded shape of the nail bed in the fingers and toes (clubbing)  Tet spells Sometimes, babies who have tetralogy of Fallot will suddenly develop deep blue skin, nails and lips after crying or feeding, or when agitated. These episodes are called tet spells. Tet spells are caused by a rapid drop in the amount of oxygen in the blood. Tet spells are most common in young infants, around 2 to 4 months old. Toddlers or older children might instinctively squat when they're short of breath. Squatting increases blood flow to the lungs.
tetralogy fallot symptoms vary  depending amount blood flow that's blocked  signs symptoms may include:  bluish coloration skin caused low blood oxygen levels (cyanosis) shortness breath rapid breathing  especially feeding exercise poor weight gain tiring easily play exercise irritability prolonged crying heart murmur fainting abnormal  rounded shape nail bed fingers toes (clubbing)  tet spells sometimes  babies who tetralogy fallot will suddenly develop deep blue skin  nails lips crying feeding  agitated  episodes called tet spells  tet spells caused rapid drop amount oxygen blood  tet spells common young infants  2 4 months old  toddlers older children instinctively squat they're short breath  squatting increases blood flow lungs
tetralogy of fallot