Studies on Anomalous Collateral Systemic-Pulmonary Circulation

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Abstract
The circulatory status of four patients with anomalous systemic-pulmonary circulations has been studied by bronchospirometry, cardiac catheterization, angiography, and dye-dilution techniques. In three of these patients the affected lung was smaller than normal, and bronchography showed no abnormalities. On the affected side angiography failed to show filling of the pulmonary artery, and the oxygen uptake appeared to be zero or minimal. In two of the patients bronchospirometry revealed an effective collateral circulation, whereas the dye-dilution curves were almost normal. In the other patient there was anatomic evidence of both transpleural systemic-pulmonary arterial communication and occlusive disease of the pulmonary veins. Here the dye-dilution curves revealed considerable shunting of blood, whereas no effective collateral circulation could be demonstrated. The fourth patient has extensive unilateral bronchiectasis and illustrates the condition wherein neither pulmonary nor systemic blood flows through the pulmonary capillary bed. The pathogenesis of the various pathways of collateral circulation is discussed, as well as some methodological and technical problems.