PULMONARY ARTERIOVENOUS-FISTULAS - INCREASE IN SHUNT AT HIGH LUNG-VOLUME

Abstract
Intrapulmonary shunt measured in the sitting position by the O2 breathing method increased at total lung capacity in 7 of 8 patients with pulmonary arteriovenous fistulas. This may explain the clinically noted increased murmur over a fistula on inspiration. An increased intrapulmonary shunt at total lung capacity might suggest the diagnosis in equivocal cases and provide a convenient test follow-up after surgery.

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