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American Journal of Roentgenology, Vol 102, 267-273, Copyright © 1968 by American Roentgen Ray Society

RADIOISOTOPE SCANNING OF THE LUNGS IN PATIENTS WITH SYSTEMIC-PULMONARY ANASTOMOSES

FRED MISHKIN M.D.1 and JOHN KNOTE M.D.2

1 Assistant Professor of Radiology
2 Resident in Radiology

Clinical, catheterization and lung scanning data of 8 patients who had surgical systemic to pulmonary shunts performed to increase pulmonary arterial blood flow were correlated in an attempt to evaluate the reliability of the lung scan in predicting whether or not the shunt was patent.

Two unknown variables control the distribution of radioactive particles to the lungs, the degree of intracardiac shunting and the amount of blood carried to the pulmonary circulation via the surgical shunt. The predominance of one or the other of these factors will cause unequal distribution of the particles to the monary arteriolar-capillary bed and consequently an asymmetric appearance on the lung scan, even in the presence of a functioning shunt. Under more balanced conditions, a symmetric appearance will be seen on the lung scan.

Thus the lung scan cannot be readily interpreted to mean that the surgical shunt is functioning or nonfunctioning.


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Copyright © 1968 by the American Roentgen Ray Society.