Experiences with left heart pressure measurements in 111 infants and children are reviewed. These studies were performed by means of transseptal left heart catheterization or anterior percutaneous left ventricular puncture. The only significant complication was the development of left pneumothorax in two patients following the latter procedure. The techniques are briefly described, and the importance of left heart catheterization in the clinical management of infants and children with heart disease is illustrated by means of selected clinical examples.
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