The perfusion scanning of lungs in 26 patients with Fallot's tetrad has shown disease to be accompanied in most cases by the disturbed distribution of the pulmonary blood flow. The authors have shown that its manifestations are either a unilateral deficiency of perfusion throughout one of the lungs or regional defects of perfusion restricted by part of the lung. Scanning of the lungs by I13 albumin microaggregate proved to be useful in the assessment of the degree of the intracardiac output of the venous blood into the arterial blood flow.
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