Scintigraphic demonstration of a right-to-left intracardiac shunt in a patient with massive pulmonary emboli.


A case of massive pulmonary embolism resulting in marked pulmonary to systemic shunting in a patient with a previously clinically inapparent ventricular or atrial septal defect is presented. The various types of unrecognized intracardiac shunts and their prevalence in the adult population are discussed. 


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