A comparative analysis of pulmonary perfusion scanning through cardiac catheterization of 57 patients including 32 patients with congenital heart disease

8 patients with chronic pulmonary thromboembolism and 7 patients with primary pulmonary hypertension is reported.

The lung scintigram obtained with In-113m or Tc-99m-MAA represents the distribution of pulmonary blood. It has been found that the lung scintigram was abnormal in patients of congenital heart disease with pulmonary hypertension (i. e. pulmonary artery pressure between 40—80 mmHg)and the extent of radioactive regional defects is proportional to the level of pulmonary hypertension. The results of the analysis indicated that pulmonary perfusion scanning being a noninvasive technique would be a useful method in evaluation the level of pulmonary hypertension in patiens with left to right shunt before and after surgical operation.