Right-to-left shunting through a patent foramen ovale without pulmonary hypertension. Transient improvement after balloon catheter closure.

A patient had a history of right tuberculosis and severe hypoxemia secondary to right-to-left shunting through a patent foramen ovale without pulmonary hypertension. A balloon tip catheter was positioned in the left atrium and retracted against the atrial septum and the hypoxemia was temporarily resolved.