Abstract
A balloon-tipped catheter was used in the preoperative assessment of a patient with a solitary pulmonary arteriovenous fistula and coexistent chronic obstructive pulmonary disease and ischemic heart disease. Studies before and two months following surgical excision of the fistula showed that the increase in arterial oxygenation (49 mm Hg vs 77 mm Hg) and the reduction in the fraction of the shunted cardiac output (37% vs 6%) closely approximated the predicted preoperative estimates.
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