Transposition of the great arteries
The normal ‘figure of eight’
systemic/pulmonary blood flow circuit is replaced by two separate parallel
circuits, i.e. systemic venous blood pass-ing through the right side of heart
returns directly to the systemic circu-lation via a connecting aorta. Pulmonary
venous blood returning to the left side of the heart is retuned directly to the
pulmonary circulation via a connecting pulmonary artery. This condition is not
compatible with life unless there is adequate mixing of the blood from both
circulations via an ASD or PDA.
Infants usually present in the
first few hours or days with worsening duct-dependent cyanosis. Hypoxia is
usually severe, but heart failure is not a feature. This is a medical emergency
and early diagnosis and intervention are required to avoid severe hypoxia.
Once diagnosed care is needed to
maintain body temperature as hypo-thermia will worsen the metabolic acidosis of
hypoxaemia. Prompt cor-rection of acidosis and hypoglycaemia is essential.
Before cardiac surgery, systemic arterial oxygenation can be improved with
prostaglandin E infu-sion and balloon atrial septostomy. Definitive arterial
switch procedure is performed in the first 2wks of life.
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